release: 2.0.1

fix: restore old input input field size
fix: admins imported from LDAP lose admin privileges
2026-02-20 03:39:52 +00:00 · 2026-01-02 23:50:35 +01:00 · 2026-01-02 23:49:41 +01:00 · 2026-01-02 23:42:25 +01:00 · 2026-01-02 19:21:58 +01:00 · 2026-01-02 19:07:32 +01:00
297 changed files with 13363 additions and 7295 deletions
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,18 @@
 # See the documentation for more information: https://pocket-id.org/docs/configuration/environment-variables
+
+# These variables must be configured for your deployment:
 APP_URL=https://your-pocket-id-domain.com
+
+# Encryption key (choose one method):
+# Method 1: Direct key (simple but less secure)
+# Generate with: openssl rand -base64 32
+ENCRYPTION_KEY=
+# Method 2: File-based key (recommended)
+# Put the base64 key in a file and point to it here.
+# ENCRYPTION_KEY_FILE=/path/to/encryption_key
+
+# These variables are optional but recommended to review:
 TRUST_PROXY=false
 MAXMIND_LICENSE_KEY=
 PUID=1000
-PGID=1000
+PGID=1000
--- a/.github/workflows/backend-linter.yml
+++ b/.github/workflows/backend-linter.yml
@@ -6,7 +6,7 @@ on:
    paths:
      - "backend/**"
  pull_request:
-    branches: [main]
+    branches: [main, breaking/**]
    paths:
      - "backend/**"

--- a/.github/workflows/e2e-tests.yml
+++ b/.github/workflows/e2e-tests.yml
@@ -7,7 +7,7 @@ on:
      - "**.md"
      - ".github/**"
  pull_request:
-    branches: [main]
+    branches: [main, breaking/**]
    paths-ignore:
      - "docs/**"
      - "**.md"
@@ -57,7 +57,17 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        db: [sqlite, postgres, sqlite-s3]
+        include:
+          - db: sqlite
+            storage: filesystem
+          - db: postgres
+            storage: filesystem
+          - db: sqlite
+            storage: s3
+          - db: sqlite
+            storage: database
+          - db: postgres
+            storage: database

    steps:
      - uses: actions/checkout@v5
@@ -71,65 +81,89 @@ jobs:
          node-version: 22

      - name: Cache Playwright Browsers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: playwright-cache
        with:
          path: ~/.cache/ms-playwright
          key: ${{ runner.os }}-playwright-${{ hashFiles('pnpm-lock.yaml') }}

      - name: Cache PostgreSQL Docker image
-        if: matrix.db == 'postgres'
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: postgres-cache
        with:
          path: /tmp/postgres-image.tar
          key: postgres-17-${{ runner.os }}
-
      - name: Pull and save PostgreSQL image
        if: matrix.db == 'postgres' && steps.postgres-cache.outputs.cache-hit != 'true'
        run: |
          docker pull postgres:17
          docker save postgres:17 > /tmp/postgres-image.tar
-
      - name: Load PostgreSQL image
        if: matrix.db == 'postgres' && steps.postgres-cache.outputs.cache-hit == 'true'
        run: docker load < /tmp/postgres-image.tar

      - name: Cache LLDAP Docker image
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: lldap-cache
        with:
          path: /tmp/lldap-image.tar
          key: lldap-stable-${{ runner.os }}
-
      - name: Pull and save LLDAP image
        if: steps.lldap-cache.outputs.cache-hit != 'true'
        run: |
-          docker pull nitnelave/lldap:stable
-          docker save nitnelave/lldap:stable > /tmp/lldap-image.tar
-
+          docker pull lldap/lldap:2025-05-19
+          docker save lldap/lldap:2025-05-19 > /tmp/lldap-image.tar
      - name: Load LLDAP image
        if: steps.lldap-cache.outputs.cache-hit == 'true'
        run: docker load < /tmp/lldap-image.tar

+      - name: Cache SCIM Test Server Docker image
+        uses: actions/cache@v4
+        id: scim-cache
+        with:
+          path: /tmp/scim-test-server-image.tar
+          key: scim-test-server-${{ runner.os }}
+      - name: Pull and save SCIM Test Server image
+        if: steps.scim-cache.outputs.cache-hit != 'true'
+        run: |
+          docker pull ghcr.io/pocket-id/scim-test-server
+          docker save ghcr.io/pocket-id/scim-test-server > /tmp/scim-test-server-image.tar
+      - name: Load SCIM Test Server image
+        if: steps.scim-cache.outputs.cache-hit == 'true'
+        run: docker load < /tmp/scim-test-server-image.tar
+
      - name: Cache Localstack S3 Docker image
-        if: matrix.db == 'sqlite-s3'
-        uses: actions/cache@v3
+        if: matrix.storage == 's3'
+        uses: actions/cache@v4
        id: s3-cache
        with:
          path: /tmp/localstack-s3-image.tar
          key: localstack-s3-latest-${{ runner.os }}
-
      - name: Pull and save Localstack S3 image
-        if: matrix.db == 'sqlite-s3' && steps.s3-cache.outputs.cache-hit != 'true'
+        if: matrix.storage == 's3' && steps.s3-cache.outputs.cache-hit != 'true'
        run: |
          docker pull localstack/localstack:s3-latest
          docker save localstack/localstack:s3-latest > /tmp/localstack-s3-image.tar
-
      - name: Load Localstack S3 image
-        if: matrix.db == 'sqlite-s3' && steps.s3-cache.outputs.cache-hit == 'true'
+        if: matrix.storage == 's3' && steps.s3-cache.outputs.cache-hit == 'true'
        run: docker load < /tmp/localstack-s3-image.tar

+      - name: Cache AWS CLI Docker image
+        if: matrix.storage == 's3'
+        uses: actions/cache@v4
+        id: aws-cli-cache
+        with:
+          path: /tmp/aws-cli-image.tar
+          key: aws-cli-latest-${{ runner.os }}
+      - name: Pull and save AWS CLI image
+        if: matrix.storage == 's3' && steps.aws-cli-cache.outputs.cache-hit != 'true'
+        run: |
+          docker pull amazon/aws-cli:latest
+          docker save amazon/aws-cli:latest > /tmp/aws-cli-image.tar
+      - name: Load AWS CLI image
+        if: matrix.storage == 's3' && steps.aws-cli-cache.outputs.cache-hit == 'true'
+        run: docker load < /tmp/aws-cli-image.tar
+
      - name: Download Docker image artifact
        uses: actions/download-artifact@v4
        with:
@@ -147,26 +181,38 @@ jobs:
        if: steps.playwright-cache.outputs.cache-hit != 'true'
        run: pnpm exec playwright install --with-deps chromium

-      - name: Run Docker Container (sqlite) with LDAP
-        if: matrix.db == 'sqlite'
+      - name: Run Docker containers
        working-directory: ./tests/setup
        run: |
-          docker compose up -d
-          docker compose logs -f pocket-id &> /tmp/backend.log &
+          DOCKER_COMPOSE_FILE=docker-compose.yml

-      - name: Run Docker Container (postgres) with LDAP
-        if: matrix.db == 'postgres'
-        working-directory: ./tests/setup
-        run: |
-          docker compose -f docker-compose-postgres.yml up -d
-          docker compose -f docker-compose-postgres.yml logs -f pocket-id &> /tmp/backend.log &
+          cat > .env <<EOF
+          FILE_BACKEND=${{ matrix.storage }}
+          SCIM_SERVICE_PROVIDER_URL=http://localhost:18123/v2
+          SCIM_SERVICE_PROVIDER_URL_INTERNAL=http://scim-test-server:8080/v2
+          EOF

-      - name: Run Docker Container (sqlite-s3) with LDAP + S3
-        if: matrix.db == 'sqlite-s3'
-        working-directory: ./tests/setup
-        run: |
-          docker compose -f docker-compose-s3.yml up -d
-          docker compose -f docker-compose-s3.yml logs -f pocket-id &> /tmp/backend.log &
+          if [ "${{ matrix.db }}" = "postgres" ]; then
+            DOCKER_COMPOSE_FILE=docker-compose-postgres.yml
+          elif [ "${{ matrix.storage }}" = "s3" ]; then
+            DOCKER_COMPOSE_FILE=docker-compose-s3.yml
+          fi
+
+          docker compose -f "$DOCKER_COMPOSE_FILE" up -d
+
+          {
+            LOG_FILE="/tmp/backend.log"
+            while true; do
+              CID=$(docker compose -f "$DOCKER_COMPOSE_FILE" ps -q pocket-id)
+              if [ -n "$CID" ]; then
+                echo "[$(date)] Attaching logs for $CID" >> "$LOG_FILE"
+                docker logs -f --since=0 "$CID" >> "$LOG_FILE" 2>&1
+              else
+                echo "[$(date)] Container not yet running…" >> "$LOG_FILE"
+              fi
+              sleep 1
+            done
+          } &

      - name: Run Playwright tests
        working-directory: ./tests
@@ -176,7 +222,7 @@ jobs:
        uses: actions/upload-artifact@v4
        if: always() && github.event.pull_request.head.ref != 'i18n_crowdin'
        with:
-          name: playwright-report-${{ matrix.db }}
+          name: playwright-report-${{ matrix.db }}-${{ matrix.storage }}
          path: tests/.report
          include-hidden-files: true
          retention-days: 15
@@ -185,7 +231,7 @@ jobs:
        uses: actions/upload-artifact@v4
        if: always() && github.event.pull_request.head.ref != 'i18n_crowdin'
        with:
-          name: backend-${{ matrix.db }}
+          name: backend-${{ matrix.db }}-${{ matrix.storage }}
          path: /tmp/backend.log
          include-hidden-files: true
          retention-days: 15
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@ node_modules
 /backend/bin
 pocket-id
 /tests/test-results/*.json
+.tmp/

 # OS
 .DS_Store
--- a/.version
+++ b/.version
@@ -1 +1 @@
-1.15.0
+2.0.1
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -5,12 +5,14 @@
      "name": "Backend",
      "type": "go",
      "request": "launch",
-      "envFile": "${workspaceFolder}/backend/cmd/.env",
+      "envFile": "${workspaceFolder}/backend/.env",
      "env": {
        "APP_ENV": "development"
      },
      "mode": "debug",
      "program": "${workspaceFolder}/backend/cmd/main.go",
+      "buildFlags": "-tags=exclude_frontend",
+      "cwd": "${workspaceFolder}/backend",
    },
    {
      "name": "Frontend",
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,101 @@
+## v2.0.1
+
+### Bug Fixes
+
+- admins imported from LDAP lose admin privileges ([2cce200](https://github.com/pocket-id/pocket-id/commit/2cce2008928081b5e0f0e6bcbc3f43816f082de9) by @stonith404)
+- restore old input input field size ([2341da9](https://github.com/pocket-id/pocket-id/commit/2341da99e9716686cf28dd0680d751ae9da0fadc) by @stonith404)
+
+### Other
+
+- bump image tag to `v2` ([cd2e9f3](https://github.com/pocket-id/pocket-id/commit/cd2e9f3a2ad753815ef8da998f9b54853d953a2a) by @stonith404)
+
+**Full Changelog**: https://github.com/pocket-id/pocket-id/compare/v2.0.0...v2.0.1
+
+## v2.0.0
+
+### Bug Fixes
+
+- update image format message to include WEBP ([#1133](https://github.com/pocket-id/pocket-id/pull/1133) by @sebdanielsson)
+- add Japanese locale to inlang settings ([#1142](https://github.com/pocket-id/pocket-id/pull/1142) by @tai-ga)
+- restrict email one time sign in token to same browser ([#1144](https://github.com/pocket-id/pocket-id/pull/1144) by @stonith404)
+- rename `LDAP_ATTRIBUTE_ADMIN_GROUP` env variable to `LDAP_ADMIN_GROUP_NAME` ([e1c5021](https://github.com/pocket-id/pocket-id/commit/e1c5021eeedcbc54bad0eccd72d7ae760be61934) by @stonith404)
+- make wildcard matching in callback URLs more stricter ([078152d](https://github.com/pocket-id/pocket-id/commit/078152d4dbb05dd027ff323f39d090ecb67927c7) by @stonith404)
+- remove ambiguous characters from login code ([d9e7bf9](https://github.com/pocket-id/pocket-id/commit/d9e7bf9eef522d8c081fac2000bace6f95518039) by @stonith404)
+- add missing translations to date picker ([894eaf3](https://github.com/pocket-id/pocket-id/commit/894eaf3cffdd9182b9c29e28b4dcb7e8bcbda26b) by @stonith404)
+
+### Features
+
+- add HTTP `HEAD` method support ([#1135](https://github.com/pocket-id/pocket-id/pull/1135) by @stonith404)
+- add email logo customization ([#1150](https://github.com/pocket-id/pocket-id/pull/1150) by @MelvinSnijders)
+- add ability define user groups for sign up tokens ([#1155](https://github.com/pocket-id/pocket-id/pull/1155) by @stonith404)
+- minor redesign of auth pages ([08e4ffe](https://github.com/pocket-id/pocket-id/commit/08e4ffeb600a4a6644d91b1600b0205997ed1685) by @stonith404)
+- allow audit log retention to be controlled by env variable ([#1158](https://github.com/pocket-id/pocket-id/pull/1158) by @jenic)
+- restrict oidc clients by user groups per default ([#1164](https://github.com/pocket-id/pocket-id/pull/1164) by @stonith404)
+- add "restricted" column to oidc client table ([1bc9f5f](https://github.com/pocket-id/pocket-id/commit/1bc9f5f7e780310d81608381544ba530df7f433b) by @stonith404)
+- drop support for storing JWK on the filesystem ([f014458](https://github.com/pocket-id/pocket-id/commit/f0144584af90b918a3157a298f1bb95928a117b8) by @stonith404)
+- add CLI command for importing and exporting Pocket ID data ([3420a00](https://github.com/pocket-id/pocket-id/commit/3420a000737d89a5c3c6c250d171d96126553beb) by @stonith404)
+- remove DbProvider env variable and calculate it dynamically ([ba2f0f1](https://github.com/pocket-id/pocket-id/commit/ba2f0f18f4bacc5a86217dec0b0dcb6030c40cb9) by @kmendell)
+- add support for SCIM provisioning ([#1182](https://github.com/pocket-id/pocket-id/pull/1182) by @stonith404)
+
+### Other
+
+- update AAGUIDs ([#1128](https://github.com/pocket-id/pocket-id/pull/1128) by @github-actions[bot])
+- fix api key e2e test ([25f67bd](https://github.com/pocket-id/pocket-id/commit/25f67bd25a0ee0cab48d72107722e8c8428fa547) by @stonith404)
+- update AAGUIDs ([#1140](https://github.com/pocket-id/pocket-id/pull/1140) by @github-actions[bot])
+- upgrade dependencies ([90f555f](https://github.com/pocket-id/pocket-id/commit/90f555f7c12ff07545f7cd1a1754a8c19f5a4978) by @stonith404)
+- fix type error after version bump ([edb32d8](https://github.com/pocket-id/pocket-id/commit/edb32d82b2c138433d8eb17d5a6a19f4728ae2d4) by @stonith404)
+- remove `breaking/**` push trigger from actions ([461293b](https://github.com/pocket-id/pocket-id/commit/461293ba1da4ddbff2c77f23a42487b63964e474) by @stonith404)
+- update AAGUIDs ([#1177](https://github.com/pocket-id/pocket-id/pull/1177) by @github-actions[bot])
+- preparation for merge into main branch ([#1113](https://github.com/pocket-id/pocket-id/pull/1113) by @stonith404)
+- bump pnpm to version 10.27.0 ([#1183](https://github.com/pocket-id/pocket-id/pull/1183) by @kmendell)
+- update forms and other areas to use new shadcn components ([#1115](https://github.com/pocket-id/pocket-id/pull/1115) by @kmendell)
+- run formatter ([e4a8ca4](https://github.com/pocket-id/pocket-id/commit/e4a8ca476cc3c7e8d8cdc8de21b5d7d99d07f7a0) by @stonith404)
+- upgrade dependencies ([4776b70](https://github.com/pocket-id/pocket-id/commit/4776b70d96f3dc291394dc79c941738bbe48199a) by @stonith404)
+- change translation string in e2e tests ([ffb2ef9](https://github.com/pocket-id/pocket-id/commit/ffb2ef91bd7bbe78eb29e86cd3675b695e821498) by @stonith404)
+
+**Full Changelog**: https://github.com/pocket-id/pocket-id/compare/v1.16.0...v2.0.0
+
+## v1.16.0
+
+### Bug Fixes
+
+- use `quoted-printable` encoding for mails to prevent line limitation ([5cf73e9](https://github.com/pocket-id/pocket-id/commit/5cf73e9309640d097ba94d97851cf502b7b2e063) by @stonith404)
+- automatically create parent directory of Sqlite db ([cfc9e46](https://github.com/pocket-id/pocket-id/commit/cfc9e464d983b051e7ed4da1620fae61dc73cff2) by @stonith404)
+- global audit log user filter not working ([d98c0a3](https://github.com/pocket-id/pocket-id/commit/d98c0a391a747f9eea70ea01c3f984264a4a7a19) by @stonith404)
+- theme mode not correctly applied if selected manually ([a1cd325](https://github.com/pocket-id/pocket-id/commit/a1cd3251cd2b7d7aca610696ef338c5d01fdce2e) by @stonith404)
+- hide theme switcher on auth pages because of dynamic background ([5d6a7fd](https://github.com/pocket-id/pocket-id/commit/5d6a7fdb58b6b82894dcb9be3b9fe6ca3e53f5fa) by @stonith404)
+
+### Documentation
+
+- add `ENCRYPTION_KEY` to `.env.example` for breaking change preparation ([4eeb06f](https://github.com/pocket-id/pocket-id/commit/4eeb06f29d984164939bf66299075efead87ee19) by @stonith404)
+
+### Features
+
+- light/dark/system mode switcher ([#1081](https://github.com/pocket-id/pocket-id/pull/1081) by @kmendell)
+- add support for S3 storage backend ([#1080](https://github.com/pocket-id/pocket-id/pull/1080) by @stonith404)
+- add support for WEBP profile pictures ([#1090](https://github.com/pocket-id/pocket-id/pull/1090) by @stonith404)
+- add database storage backend ([#1091](https://github.com/pocket-id/pocket-id/pull/1091) by @ItalyPaleAle)
+- adding/removing passkeys creates an entry in audit logs ([#1099](https://github.com/pocket-id/pocket-id/pull/1099) by @ItalyPaleAle)
+- add option to disable S3 integrity check ([a3c9687](https://github.com/pocket-id/pocket-id/commit/a3c968758a17e95b2e55ae179d6601d8ec2cf052) by @stonith404)
+- add `Cache-Control: private, no-store` to all API routes per default ([#1126](https://github.com/pocket-id/pocket-id/pull/1126) by @stonith404)
+
+### Other
+
+- update pnpm to 10.20 ([#1082](https://github.com/pocket-id/pocket-id/pull/1082) by @kmendell)
+- run checks on PR to `breaking/**` branches ([ab9c0f9](https://github.com/pocket-id/pocket-id/commit/ab9c0f9ac092725c70ec3a963f57bc739f425d4f) by @stonith404)
+- use constants for AppEnv values ([#1098](https://github.com/pocket-id/pocket-id/pull/1098) by @ItalyPaleAle)
+- bump golang.org/x/crypto from 0.43.0 to 0.45.0 in /backend in the go_modules group across 1 directory ([#1107](https://github.com/pocket-id/pocket-id/pull/1107) by @dependabot[bot])
+- add Finish files ([ca888b3](https://github.com/pocket-id/pocket-id/commit/ca888b3dd221a209df5e7beb749156f7ea21e1c0) by @stonith404)
+- upgrade dependencies ([4bde271](https://github.com/pocket-id/pocket-id/commit/4bde271b4715f59bd2ed1f7c18a867daf0f26b8b) by @stonith404)
+- fix Dutch validation message ([f523f39](https://github.com/pocket-id/pocket-id/commit/f523f39483a06256892d17dc02528ea009c87a9f) by @stonith404)
+- fix package vulnerabilities ([3d46bad](https://github.com/pocket-id/pocket-id/commit/3d46badb3cecc1ee8eb8bfc9b377108be32d4ffc) by @stonith404)
+- update vscode launch.json ([#1117](https://github.com/pocket-id/pocket-id/pull/1117) by @mnestor)
+- rename file backend value `fs` to `filesystem` ([8d30346](https://github.com/pocket-id/pocket-id/commit/8d30346f642b483653f7a3dec006cb0273927afb) by @stonith404)
+- fix wrong storage value ([b2c718d](https://github.com/pocket-id/pocket-id/commit/b2c718d13d12b6c152e19974d3490c2ed7f5d51d) by @stonith404)
+- run formatter ([14c7471](https://github.com/pocket-id/pocket-id/commit/14c7471b5272cdaf42751701d842348d0d60cd0e) by @stonith404)
+
+**Full Changelog**: https://github.com/pocket-id/pocket-id/compare/v1.15.0...v1.16.0
+
 ## v1.15.0

 ### Bug Fixes
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Pocket ID is a simple OIDC provider that allows users to authenticate with their

 → Try out the [Demo](https://demo.pocket-id.org)

-<img src="https://github.com/user-attachments/assets/96ac549d-b897-404a-8811-f42b16ea58e2" width="1200"/>
+<img src="https://github.com/user-attachments/assets/1e99ba44-76da-4b47-9b8a-dbe9b7f84512" width="1200"/>

 The goal of Pocket ID is to be a simple and easy-to-use. There are other self-hosted OIDC providers like [Keycloak](https://www.keycloak.org/) or [ORY Hydra](https://www.ory.sh/hydra/) but they are often too complex for simple use cases.

--- a/backend/cmd/main.go
+++ b/backend/cmd/main.go
@@ -1,9 +1,12 @@
 package main

 import (
+	"fmt"
+	"os"
 	_ "time/tzdata"

 	"github.com/pocket-id/pocket-id/backend/internal/cmds"
+	"github.com/pocket-id/pocket-id/backend/internal/common"
 )

 // @title Pocket ID API
@@ -11,5 +14,9 @@ import (
 // @description.markdown

 func main() {
+	if err := common.ValidateEnvConfig(&common.EnvConfig); err != nil {
+		fmt.Fprintf(os.Stderr, "config error: %v\n", err)
+		os.Exit(1)
+	}
 	cmds.Execute()
 }
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -3,107 +3,107 @@ module github.com/pocket-id/pocket-id/backend
 go 1.25

 require (
-	github.com/aws/aws-sdk-go-v2 v1.39.6
-	github.com/aws/aws-sdk-go-v2/config v1.31.17
-	github.com/aws/aws-sdk-go-v2/credentials v1.18.21
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.90.0
-	github.com/aws/smithy-go v1.23.2
+	github.com/aws/aws-sdk-go-v2 v1.41.0
+	github.com/aws/aws-sdk-go-v2/config v1.32.6
+	github.com/aws/aws-sdk-go-v2/credentials v1.19.6
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.95.0
+	github.com/aws/smithy-go v1.24.0
 	github.com/caarlos0/env/v11 v11.3.1
 	github.com/cenkalti/backoff/v5 v5.0.3
 	github.com/disintegration/imageorient v0.0.0-20180920195336-8147d86e83ec
 	github.com/disintegration/imaging v1.6.2
 	github.com/emersion/go-sasl v0.0.0-20241020182733-b788ff22d5a6
 	github.com/emersion/go-smtp v0.24.0
-	github.com/fxamacker/cbor/v2 v2.9.0
-	github.com/gin-contrib/slog v1.1.0
+	github.com/gin-contrib/slog v1.2.0
 	github.com/gin-gonic/gin v1.11.0
 	github.com/glebarez/go-sqlite v1.22.0
 	github.com/glebarez/sqlite v1.11.0
-	github.com/go-co-op/gocron/v2 v2.17.0
+	github.com/go-co-op/gocron/v2 v2.19.0
 	github.com/go-ldap/ldap/v3 v3.4.12
-	github.com/go-playground/validator/v10 v10.28.0
-	github.com/go-webauthn/webauthn v0.14.0
-	github.com/golang-migrate/migrate/v4 v4.19.0
+	github.com/go-playground/validator/v10 v10.30.1
+	github.com/go-webauthn/webauthn v0.15.0
+	github.com/golang-migrate/migrate/v4 v4.19.1
 	github.com/google/uuid v1.6.0
 	github.com/hashicorp/go-uuid v1.0.3
 	github.com/jinzhu/copier v0.4.0
 	github.com/joho/godotenv v1.5.1
-	github.com/lestrrat-go/httprc/v3 v3.0.1
+	github.com/lestrrat-go/httprc/v3 v3.0.3
 	github.com/lestrrat-go/jwx/v3 v3.0.12
 	github.com/lmittmann/tint v1.1.2
 	github.com/mattn/go-isatty v0.0.20
 	github.com/mileusna/useragent v1.3.5
 	github.com/orandin/slog-gorm v1.4.0
-	github.com/oschwald/maxminddb-golang/v2 v2.0.0
-	github.com/spf13/cobra v1.10.1
+	github.com/oschwald/maxminddb-golang/v2 v2.1.1
+	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.11.1
-	go.opentelemetry.io/contrib/bridges/otelslog v0.13.0
-	go.opentelemetry.io/contrib/exporters/autoexport v0.63.0
-	go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.63.0
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
-	go.opentelemetry.io/otel v1.38.0
-	go.opentelemetry.io/otel/log v0.14.0
-	go.opentelemetry.io/otel/metric v1.38.0
-	go.opentelemetry.io/otel/sdk v1.38.0
-	go.opentelemetry.io/otel/sdk/log v0.14.0
-	go.opentelemetry.io/otel/sdk/metric v1.38.0
-	go.opentelemetry.io/otel/trace v1.38.0
-	golang.org/x/crypto v0.43.0
-	golang.org/x/image v0.32.0
-	golang.org/x/sync v0.17.0
-	golang.org/x/text v0.30.0
+	go.opentelemetry.io/contrib/bridges/otelslog v0.14.0
+	go.opentelemetry.io/contrib/exporters/autoexport v0.64.0
+	go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.64.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0
+	go.opentelemetry.io/otel v1.39.0
+	go.opentelemetry.io/otel/log v0.15.0
+	go.opentelemetry.io/otel/metric v1.39.0
+	go.opentelemetry.io/otel/sdk v1.39.0
+	go.opentelemetry.io/otel/sdk/log v0.15.0
+	go.opentelemetry.io/otel/sdk/metric v1.39.0
+	go.opentelemetry.io/otel/trace v1.39.0
+	golang.org/x/crypto v0.46.0
+	golang.org/x/image v0.34.0
+	golang.org/x/sync v0.19.0
+	golang.org/x/text v0.32.0
 	golang.org/x/time v0.14.0
 	gorm.io/driver/postgres v1.6.0
-	gorm.io/gorm v1.31.0
+	gorm.io/gorm v1.31.1
 )

 require (
-	github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 // indirect
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.3 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.13 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.13 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.13 // indirect
+	github.com/Azure/go-ntlmssp v0.1.0 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.16 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.16 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.16 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.4 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.3 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.4 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.30.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.5 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.39.1 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/signin v1.0.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.30.8 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.12 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.41.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bytedance/gopkg v0.1.3 // indirect
-	github.com/bytedance/sonic v1.14.1 // indirect
-	github.com/bytedance/sonic/loader v0.3.0 // indirect
+	github.com/bytedance/sonic v1.14.2 // indirect
+	github.com/bytedance/sonic/loader v0.4.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/disintegration/gift v1.2.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.10 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.12 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
 	github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-webauthn/x v0.1.25 // indirect
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/go-webauthn/x v0.1.27 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
-	github.com/goccy/go-yaml v1.18.0 // indirect
+	github.com/goccy/go-yaml v1.19.1 // indirect
 	github.com/golang-jwt/jwt/v5 v5.3.0 // indirect
 	github.com/google/go-github/v39 v39.2.0 // indirect
-	github.com/google/go-querystring v1.1.0 // indirect
-	github.com/google/go-tpm v0.9.6 // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect
-	github.com/hashicorp/errwrap v1.1.0 // indirect
-	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/google/go-querystring v1.2.0 // indirect
+	github.com/google/go-tpm v0.9.8 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.4 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.7.6 // indirect
+	github.com/jackc/pgx/v5 v5.8.0 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
@@ -115,61 +115,57 @@ require (
 	github.com/lestrrat-go/dsig v1.0.0 // indirect
 	github.com/lestrrat-go/dsig-secp256k1 v1.0.0 // indirect
 	github.com/lestrrat-go/httpcc v1.0.1 // indirect
-	github.com/lestrrat-go/option v1.0.1 // indirect
 	github.com/lestrrat-go/option/v2 v2.0.0 // indirect
 	github.com/lib/pq v1.10.9 // indirect
-	github.com/mattn/go-sqlite3 v1.14.32 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mattn/go-sqlite3 v1.14.33 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_golang v1.23.2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.67.1 // indirect
+	github.com/prometheus/common v0.67.4 // indirect
 	github.com/prometheus/otlptranslator v1.0.0 // indirect
-	github.com/prometheus/procfs v0.18.0 // indirect
-	github.com/quic-go/qpack v0.5.1 // indirect
-	github.com/quic-go/quic-go v0.55.0 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/quic-go/quic-go v0.58.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
 	github.com/segmentio/asm v1.2.1 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.3.0 // indirect
-	github.com/valyala/fastjson v1.6.4 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
+	github.com/valyala/fastjson v1.6.7 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/bridges/prometheus v0.63.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.14.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.14.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/prometheus v0.60.0 // indirect
-	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.14.0 // indirect
-	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.38.0 // indirect
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.38.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.8.0 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.64.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.15.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.15.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.61.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.15.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.39.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.39.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
-	golang.org/x/arch v0.22.0 // indirect
-	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
-	golang.org/x/mod v0.29.0 // indirect
-	golang.org/x/net v0.46.0 // indirect
-	golang.org/x/oauth2 v0.32.0 // indirect
-	golang.org/x/sys v0.37.0 // indirect
-	golang.org/x/tools v0.38.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20251022142026-3a174f9686a8 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8 // indirect
-	google.golang.org/grpc v1.76.0 // indirect
-	google.golang.org/protobuf v1.36.10 // indirect
+	golang.org/x/arch v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20251219203646-944ab1f22d93 // indirect
+	golang.org/x/net v0.48.0 // indirect
+	golang.org/x/oauth2 v0.34.0 // indirect
+	golang.org/x/sys v0.39.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20251222181119-0a764e51fe1b // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251222181119-0a764e51fe1b // indirect
+	google.golang.org/grpc v1.78.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	modernc.org/libc v1.66.10 // indirect
+	modernc.org/libc v1.67.4 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
-	modernc.org/sqlite v1.39.1 // indirect
+	modernc.org/sqlite v1.42.2 // indirect
 )
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -1,55 +1,57 @@
 github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 h1:L/gRVlceqvL25UVaW/CKtUDjefjrs0SPonmDGUVOYP0=
 github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
-github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 h1:mFRzDkZVAjdal+s7s0MwaRv9igoPqLRdzOLzw/8Xvq8=
-github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
+github.com/Azure/go-ntlmssp v0.1.0 h1:DjFo6YtWzNqNvQdrwEyr/e4nhU3vRiwenz5QX7sFz+A=
+github.com/Azure/go-ntlmssp v0.1.0/go.mod h1:NYqdhxd/8aAct/s4qSYZEerdPuH1liG2/X9DiVTbhpk=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/alexbrainman/sspi v0.0.0-20250919150558-7d374ff0d59e h1:4dAU9FXIyQktpoUAgOJK3OTFc/xug0PCXYCqU0FgDKI=
 github.com/alexbrainman/sspi v0.0.0-20250919150558-7d374ff0d59e/go.mod h1:cEWa1LVoE5KvSD9ONXsZrj0z6KqySlCCNKHlLzbqAt4=
-github.com/aws/aws-sdk-go-v2 v1.39.6 h1:2JrPCVgWJm7bm83BDwY5z8ietmeJUbh3O2ACnn+Xsqk=
-github.com/aws/aws-sdk-go-v2 v1.39.6/go.mod h1:c9pm7VwuW0UPxAEYGyTmyurVcNrbF6Rt/wixFqDhcjE=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.3 h1:DHctwEM8P8iTXFxC/QK0MRjwEpWQeM9yzidCRjldUz0=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.3/go.mod h1:xdCzcZEtnSTKVDOmUZs4l/j3pSV6rpo1WXl5ugNsL8Y=
-github.com/aws/aws-sdk-go-v2/config v1.31.17 h1:QFl8lL6RgakNK86vusim14P2k8BFSxjvUkcWLDjgz9Y=
-github.com/aws/aws-sdk-go-v2/config v1.31.17/go.mod h1:V8P7ILjp/Uef/aX8TjGk6OHZN6IKPM5YW6S78QnRD5c=
-github.com/aws/aws-sdk-go-v2/credentials v1.18.21 h1:56HGpsgnmD+2/KpG0ikvvR8+3v3COCwaF4r+oWwOeNA=
-github.com/aws/aws-sdk-go-v2/credentials v1.18.21/go.mod h1:3YELwedmQbw7cXNaII2Wywd+YY58AmLPwX4LzARgmmA=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.13 h1:T1brd5dR3/fzNFAQch/iBKeX07/ffu/cLu+q+RuzEWk=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.13/go.mod h1:Peg/GBAQ6JDt+RoBf4meB1wylmAipb7Kg2ZFakZTlwk=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.13 h1:a+8/MLcWlIxo1lF9xaGt3J/u3yOZx+CdSveSNwjhD40=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.13/go.mod h1:oGnKwIYZ4XttyU2JWxFrwvhF6YKiK/9/wmE3v3Iu9K8=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.13 h1:HBSI2kDkMdWz4ZM7FjwE7e/pWDEZ+nR95x8Ztet1ooY=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.13/go.mod h1:YE94ZoDArI7awZqJzBAZ3PDD2zSfuP7w6P2knOzIn8M=
+github.com/aws/aws-sdk-go-v2 v1.41.0 h1:tNvqh1s+v0vFYdA1xq0aOJH+Y5cRyZ5upu6roPgPKd4=
+github.com/aws/aws-sdk-go-v2 v1.41.0/go.mod h1:MayyLB8y+buD9hZqkCW3kX1AKq07Y5pXxtgB+rRFhz0=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4 h1:489krEF9xIGkOaaX3CE/Be2uWjiXrkCH6gUX+bZA/BU=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4/go.mod h1:IOAPF6oT9KCsceNTvvYMNHy0+kMF8akOjeDvPENWxp4=
+github.com/aws/aws-sdk-go-v2/config v1.32.6 h1:hFLBGUKjmLAekvi1evLi5hVvFQtSo3GYwi+Bx4lpJf8=
+github.com/aws/aws-sdk-go-v2/config v1.32.6/go.mod h1:lcUL/gcd8WyjCrMnxez5OXkO3/rwcNmvfno62tnXNcI=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.6 h1:F9vWao2TwjV2MyiyVS+duza0NIRtAslgLUM0vTA1ZaE=
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@@ -222,12 +226,10 @@ github.com/lestrrat-go/dsig-secp256k1 v1.0.0 h1:JpDe4Aybfl0soBvoVwjqDbp+9S1Y2OM7
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@@ -263,28 +263,29 @@ github.com/opencontainers/image-spec v1.1.0 h1:8SG7/vwALn54lVB/0yZ/MMwhFrPYtpEHQ
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@@ -294,141 +295,143 @@ github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7
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@@ -437,20 +440,22 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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@@ -459,8 +464,8 @@ modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
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 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
-modernc.org/sqlite v1.39.1 h1:H+/wGFzuSCIEVCvXYVHX5RQglwhMOvtHSv+VtidL2r4=
-modernc.org/sqlite v1.39.1/go.mod h1:9fjQZ0mB1LLP0GYrp39oOJXx/I2sxEnZtzCmEQIKvGE=
+modernc.org/sqlite v1.42.2 h1:7hkZUNJvJFN2PgfUdjni9Kbvd4ef4mNLOu0B9FGxM74=
+modernc.org/sqlite v1.42.2/go.mod h1:+VkC6v3pLOAE0A0uVucQEcbVW0I5nHCeDaBf+DpsQT8=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
--- a/backend/internal/bootstrap/app_images_bootstrap.go
+++ b/backend/internal/bootstrap/app_images_bootstrap.go
@@ -24,7 +24,8 @@ func initApplicationImages(ctx context.Context, fileStorage storage.FileStorage)
 	// Previous versions of images
 	// If these are found, they are deleted
 	legacyImageHashes := imageHashMap{
-		"background.jpg": mustDecodeHex("138d510030ed845d1d74de34658acabff562d306476454369a60ab8ade31933f"),
+		"background.jpg":  mustDecodeHex("138d510030ed845d1d74de34658acabff562d306476454369a60ab8ade31933f"),
+		"background.webp": mustDecodeHex("3fc436a66d6b872b01d96a4e75046c46b5c3e2daccd51e98ecdf98fd445599ab"),
 	}

 	sourceFiles, err := resources.FS.ReadDir("images")
--- a/backend/internal/bootstrap/bootstrap.go
+++ b/backend/internal/bootstrap/bootstrap.go
@@ -7,6 +7,7 @@ import (
 	"time"

 	_ "github.com/golang-migrate/migrate/v4/source/file"
+	"gorm.io/gorm"

 	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/job"
@@ -15,6 +16,16 @@ import (
 )

 func Bootstrap(ctx context.Context) error {
+	var shutdownFns []utils.Service
+	defer func() { //nolint:contextcheck
+		// Invoke all shutdown functions on exit
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if err := utils.NewServiceRunner(shutdownFns...).Run(shutdownCtx); err != nil {
+			slog.Error("Error during graceful shutdown", "error", err)
+		}
+	}()
+
 	// Initialize the observability stack, including the logger, distributed tracing, and metrics
 	shutdownFns, httpClient, err := initObservability(ctx, common.EnvConfig.MetricsEnabled, common.EnvConfig.TracingEnabled)
 	if err != nil {
@@ -22,28 +33,14 @@ func Bootstrap(ctx context.Context) error {
 	}
 	slog.InfoContext(ctx, "Pocket ID is starting")

-	// Initialize the file storage backend
-	var fileStorage storage.FileStorage
-
-	switch common.EnvConfig.FileBackend {
-	case storage.TypeFileSystem:
-		fileStorage, err = storage.NewFilesystemStorage(common.EnvConfig.UploadPath)
-	case storage.TypeS3:
-		s3Cfg := storage.S3Config{
-			Bucket:          common.EnvConfig.S3Bucket,
-			Region:          common.EnvConfig.S3Region,
-			Endpoint:        common.EnvConfig.S3Endpoint,
-			AccessKeyID:     common.EnvConfig.S3AccessKeyID,
-			SecretAccessKey: common.EnvConfig.S3SecretAccessKey,
-			ForcePathStyle:  common.EnvConfig.S3ForcePathStyle,
-			Root:            common.EnvConfig.UploadPath,
-		}
-		fileStorage, err = storage.NewS3Storage(ctx, s3Cfg)
-	default:
-		err = fmt.Errorf("unknown file storage backend: %s", common.EnvConfig.FileBackend)
-	}
+	db, err := NewDatabase()
 	if err != nil {
-		return fmt.Errorf("failed to initialize file storage: %w", err)
+		return fmt.Errorf("failed to initialize database: %w", err)
+	}
+
+	fileStorage, err := InitStorage(ctx, db)
+	if err != nil {
+		return fmt.Errorf("failed to initialize file storage (backend: %s): %w", common.EnvConfig.FileBackend, err)
 	}

 	imageExtensions, err := initApplicationImages(ctx, fileStorage)
@@ -51,18 +48,32 @@ func Bootstrap(ctx context.Context) error {
 		return fmt.Errorf("failed to initialize application images: %w", err)
 	}

-	// Connect to the database
-	db, err := NewDatabase()
-	if err != nil {
-		return fmt.Errorf("failed to initialize database: %w", err)
-	}
-
 	// Create all services
 	svc, err := initServices(ctx, db, httpClient, imageExtensions, fileStorage)
 	if err != nil {
 		return fmt.Errorf("failed to initialize services: %w", err)
 	}

+	waitUntil, err := svc.appLockService.Acquire(ctx, false)
+	if err != nil {
+		return fmt.Errorf("failed to acquire application lock: %w", err)
+	}
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-time.After(time.Until(waitUntil)):
+	}
+
+	shutdownFn := func(shutdownCtx context.Context) error {
+		sErr := svc.appLockService.Release(shutdownCtx)
+		if sErr != nil {
+			return fmt.Errorf("failed to release application lock: %w", sErr)
+		}
+		return nil
+	}
+	shutdownFns = append(shutdownFns, shutdownFn)
+
 	// Init the job scheduler
 	scheduler, err := job.NewScheduler()
 	if err != nil {
@@ -74,28 +85,51 @@ func Bootstrap(ctx context.Context) error {
 	}

 	// Init the router
-	router := initRouter(db, svc)
+	router, err := initRouter(db, svc)
+	if err != nil {
+		return fmt.Errorf("failed to initialize router: %w", err)
+	}

 	// Run all background services
 	// This call blocks until the context is canceled
-	err = utils.
-		NewServiceRunner(router, scheduler.Run).
-		Run(ctx)
+	services := []utils.Service{svc.appLockService.RunRenewal, router}
+
+	if common.EnvConfig.AppEnv != "test" {
+		services = append(services, scheduler.Run)
+	}
+
+	err = utils.NewServiceRunner(services...).Run(ctx)
 	if err != nil {
 		return fmt.Errorf("failed to run services: %w", err)
 	}

-	// Invoke all shutdown functions
-	// We give these a timeout of 5s
-	// Note: we use a background context because the run context has been canceled already
-	shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
-	defer shutdownCancel()
-	err = utils.
-		NewServiceRunner(shutdownFns...).
-		Run(shutdownCtx) //nolint:contextcheck
-	if err != nil {
-		slog.Error("Error shutting down services", slog.Any("error", err))
-	}
-
 	return nil
 }
+
+func InitStorage(ctx context.Context, db *gorm.DB) (fileStorage storage.FileStorage, err error) {
+	switch common.EnvConfig.FileBackend {
+	case storage.TypeFileSystem:
+		fileStorage, err = storage.NewFilesystemStorage(common.EnvConfig.UploadPath)
+	case storage.TypeDatabase:
+		fileStorage, err = storage.NewDatabaseStorage(db)
+	case storage.TypeS3:
+		s3Cfg := storage.S3Config{
+			Bucket:                        common.EnvConfig.S3Bucket,
+			Region:                        common.EnvConfig.S3Region,
+			Endpoint:                      common.EnvConfig.S3Endpoint,
+			AccessKeyID:                   common.EnvConfig.S3AccessKeyID,
+			SecretAccessKey:               common.EnvConfig.S3SecretAccessKey,
+			ForcePathStyle:                common.EnvConfig.S3ForcePathStyle,
+			DisableDefaultIntegrityChecks: common.EnvConfig.S3DisableDefaultIntegrityChecks,
+			Root:                          common.EnvConfig.UploadPath,
+		}
+		fileStorage, err = storage.NewS3Storage(ctx, s3Cfg)
+	default:
+		err = fmt.Errorf("unknown file storage backend: %s", common.EnvConfig.FileBackend)
+	}
+	if err != nil {
+		return fileStorage, err
+	}
+
+	return fileStorage, nil
+}
--- a/backend/internal/bootstrap/db_bootstrap.go
+++ b/backend/internal/bootstrap/db_bootstrap.go
@@ -12,12 +12,7 @@ import (
 	"time"

 	"github.com/glebarez/sqlite"
-	"github.com/golang-migrate/migrate/v4"
-	"github.com/golang-migrate/migrate/v4/database"
-	postgresMigrate "github.com/golang-migrate/migrate/v4/database/postgres"
-	sqliteMigrate "github.com/golang-migrate/migrate/v4/database/sqlite3"
 	_ "github.com/golang-migrate/migrate/v4/source/github"
-	"github.com/golang-migrate/migrate/v4/source/iofs"
 	slogGorm "github.com/orandin/slog-gorm"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
@@ -26,11 +21,10 @@ import (
 	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/utils"
 	sqliteutil "github.com/pocket-id/pocket-id/backend/internal/utils/sqlite"
-	"github.com/pocket-id/pocket-id/backend/resources"
 )

 func NewDatabase() (db *gorm.DB, err error) {
-	db, err = connectDatabase()
+	db, err = ConnectDatabase()
 	if err != nil {
 		return nil, fmt.Errorf("failed to connect to database: %w", err)
 	}
@@ -39,105 +33,15 @@ func NewDatabase() (db *gorm.DB, err error) {
 		return nil, fmt.Errorf("failed to get sql.DB: %w", err)
 	}

-	// Choose the correct driver for the database provider
-	var driver database.Driver
-	switch common.EnvConfig.DbProvider {
-	case common.DbProviderSqlite:
-		driver, err = sqliteMigrate.WithInstance(sqlDb, &sqliteMigrate.Config{
-			NoTxWrap: true,
-		})
-	case common.DbProviderPostgres:
-		driver, err = postgresMigrate.WithInstance(sqlDb, &postgresMigrate.Config{})
-	default:
-		// Should never happen at this point
-		return nil, fmt.Errorf("unsupported database provider: %s", common.EnvConfig.DbProvider)
-	}
-	if err != nil {
-		return nil, fmt.Errorf("failed to create migration driver: %w", err)
-	}
-
 	// Run migrations
-	if err := migrateDatabase(driver); err != nil {
+	if err := utils.MigrateDatabase(sqlDb); err != nil {
 		return nil, fmt.Errorf("failed to run migrations: %w", err)
 	}

 	return db, nil
 }

-func migrateDatabase(driver database.Driver) error {
-	// Embedded migrations via iofs
-	path := "migrations/" + string(common.EnvConfig.DbProvider)
-	source, err := iofs.New(resources.FS, path)
-	if err != nil {
-		return fmt.Errorf("failed to create embedded migration source: %w", err)
-	}
-
-	m, err := migrate.NewWithInstance("iofs", source, "pocket-id", driver)
-	if err != nil {
-		return fmt.Errorf("failed to create migration instance: %w", err)
-	}
-
-	requiredVersion, err := getRequiredMigrationVersion(path)
-	if err != nil {
-		return fmt.Errorf("failed to get last migration version: %w", err)
-	}
-
-	currentVersion, _, _ := m.Version()
-	if currentVersion > requiredVersion {
-		slog.Warn("Database version is newer than the application supports, possible downgrade detected", slog.Uint64("db_version", uint64(currentVersion)), slog.Uint64("app_version", uint64(requiredVersion)))
-		if !common.EnvConfig.AllowDowngrade {
-			return fmt.Errorf("database version (%d) is newer than application version (%d), downgrades are not allowed (set ALLOW_DOWNGRADE=true to enable)", currentVersion, requiredVersion)
-		}
-		slog.Info("Fetching migrations from GitHub to handle possible downgrades")
-		return migrateDatabaseFromGitHub(driver, requiredVersion)
-	}
-
-	if err := m.Migrate(requiredVersion); err != nil && !errors.Is(err, migrate.ErrNoChange) {
-		return fmt.Errorf("failed to apply embedded migrations: %w", err)
-	}
-	return nil
-}
-
-func migrateDatabaseFromGitHub(driver database.Driver, version uint) error {
-	srcURL := "github://pocket-id/pocket-id/backend/resources/migrations/" + string(common.EnvConfig.DbProvider)
-
-	m, err := migrate.NewWithDatabaseInstance(srcURL, "pocket-id", driver)
-	if err != nil {
-		return fmt.Errorf("failed to create GitHub migration instance: %w", err)
-	}
-
-	if err := m.Migrate(version); err != nil && !errors.Is(err, migrate.ErrNoChange) {
-		return fmt.Errorf("failed to apply GitHub migrations: %w", err)
-	}
-	return nil
-}
-
-// getRequiredMigrationVersion reads the embedded migration files and returns the highest version number found.
-func getRequiredMigrationVersion(path string) (uint, error) {
-	entries, err := resources.FS.ReadDir(path)
-	if err != nil {
-		return 0, fmt.Errorf("failed to read migration directory: %w", err)
-	}
-
-	var maxVersion uint
-	for _, entry := range entries {
-		if entry.IsDir() {
-			continue
-		}
-		name := entry.Name()
-		var version uint
-		n, err := fmt.Sscanf(name, "%d_", &version)
-		if err == nil && n == 1 {
-			if version > maxVersion {
-				maxVersion = version
-			}
-		}
-	}
-
-	return maxVersion, nil
-}
-
-func connectDatabase() (db *gorm.DB, err error) {
+func ConnectDatabase() (db *gorm.DB, err error) {
 	var dialector gorm.Dialector

 	// Choose the correct database provider
@@ -155,6 +59,12 @@ func connectDatabase() (db *gorm.DB, err error) {
 			return nil, err
 		}

+		if !isMemoryDB {
+			if err := ensureSqliteDatabaseDir(dbPath); err != nil {
+				return nil, err
+			}
+		}
+
 		// Before we connect, also make sure that there's a temporary folder for SQLite to write its data
 		err = ensureSqliteTempDir(filepath.Dir(dbPath))
 		if err != nil {
@@ -388,6 +298,27 @@ func isSqliteInMemory(connString string) bool {
 	return len(qs["mode"]) > 0 && qs["mode"][0] == "memory"
 }

+// ensureSqliteDatabaseDir creates the parent directory for the SQLite database file if it doesn't exist yet
+func ensureSqliteDatabaseDir(dbPath string) error {
+	dir := filepath.Dir(dbPath)
+
+	info, err := os.Stat(dir)
+	switch {
+	case err == nil:
+		if !info.IsDir() {
+			return fmt.Errorf("SQLite database directory '%s' is not a directory", dir)
+		}
+		return nil
+	case os.IsNotExist(err):
+		if err := os.MkdirAll(dir, 0700); err != nil {
+			return fmt.Errorf("failed to create SQLite database directory '%s': %w", dir, err)
+		}
+		return nil
+	default:
+		return fmt.Errorf("failed to check SQLite database directory '%s': %w", dir, err)
+	}
+}
+
 // ensureSqliteTempDir ensures that SQLite has a directory where it can write temporary files if needed
 // The default directory may not be writable when using a container with a read-only root file system
 // See: https://www.sqlite.org/tempfiles.html
--- a/backend/internal/bootstrap/db_bootstrap_test.go
+++ b/backend/internal/bootstrap/db_bootstrap_test.go
@@ -2,6 +2,8 @@ package bootstrap

 import (
 	"net/url"
+	"os"
+	"path/filepath"
 	"testing"

 	"github.com/stretchr/testify/assert"
@@ -84,6 +86,29 @@ func TestIsSqliteInMemory(t *testing.T) {
 	}
 }

+func TestEnsureSqliteDatabaseDir(t *testing.T) {
+	t.Run("creates missing directory", func(t *testing.T) {
+		tempDir := t.TempDir()
+		dbPath := filepath.Join(tempDir, "nested", "pocket-id.db")
+
+		err := ensureSqliteDatabaseDir(dbPath)
+		require.NoError(t, err)
+
+		info, err := os.Stat(filepath.Dir(dbPath))
+		require.NoError(t, err)
+		assert.True(t, info.IsDir())
+	})
+
+	t.Run("fails when parent is file", func(t *testing.T) {
+		tempDir := t.TempDir()
+		filePath := filepath.Join(tempDir, "file.txt")
+		require.NoError(t, os.WriteFile(filePath, []byte("test"), 0o600))
+
+		err := ensureSqliteDatabaseDir(filepath.Join(filePath, "data.db"))
+		require.Error(t, err)
+	})
+}
+
 func TestConvertSqlitePragmaArgs(t *testing.T) {
 	tests := []struct {
 		name     string
--- a/backend/internal/bootstrap/e2etest_router_bootstrap.go
+++ b/backend/internal/bootstrap/e2etest_router_bootstrap.go
@@ -17,7 +17,7 @@ import (
 func init() {
 	registerTestControllers = []func(apiGroup *gin.RouterGroup, db *gorm.DB, svc *services){
 		func(apiGroup *gin.RouterGroup, db *gorm.DB, svc *services) {
-			testService, err := service.NewTestService(db, svc.appConfigService, svc.jwtService, svc.ldapService, svc.fileStorage)
+			testService, err := service.NewTestService(db, svc.appConfigService, svc.jwtService, svc.ldapService, svc.appLockService, svc.fileStorage)
 			if err != nil {
 				slog.Error("Failed to initialize test service", slog.Any("error", err))
 				os.Exit(1)
--- a/backend/internal/bootstrap/router_bootstrap.go
+++ b/backend/internal/bootstrap/router_bootstrap.go
@@ -29,23 +29,14 @@ import (
 // This is used to register additional controllers for tests
 var registerTestControllers []func(apiGroup *gin.RouterGroup, db *gorm.DB, svc *services)

-func initRouter(db *gorm.DB, svc *services) utils.Service {
-	runner, err := initRouterInternal(db, svc)
-	if err != nil {
-		slog.Error("Failed to init router", "error", err)
-		os.Exit(1)
-	}
-	return runner
-}
-
-func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
+func initRouter(db *gorm.DB, svc *services) (utils.Service, error) {
 	// Set the appropriate Gin mode based on the environment
 	switch common.EnvConfig.AppEnv {
-	case "production":
+	case common.AppEnvProduction:
 		gin.SetMode(gin.ReleaseMode)
-	case "development":
+	case common.AppEnvDevelopment:
 		gin.SetMode(gin.DebugMode)
-	case "test":
+	case common.AppEnvTest:
 		gin.SetMode(gin.TestMode)
 	}

@@ -63,6 +54,8 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 	rateLimitMiddleware := middleware.NewRateLimitMiddleware().Add(rate.Every(time.Second), 60)

 	// Setup global middleware
+	r.Use(middleware.HeadMiddleware())
+	r.Use(middleware.NewCacheControlMiddleware().Add())
 	r.Use(middleware.NewCorsMiddleware().Add())
 	r.Use(middleware.NewCspMiddleware().Add())
 	r.Use(middleware.NewErrorHandlerMiddleware().Add())
@@ -90,9 +83,10 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 	controller.NewUserGroupController(apiGroup, authMiddleware, svc.userGroupService)
 	controller.NewCustomClaimController(apiGroup, authMiddleware, svc.customClaimService)
 	controller.NewVersionController(apiGroup, svc.versionService)
+	controller.NewScimController(apiGroup, authMiddleware, svc.scimService)

 	// Add test controller in non-production environments
-	if common.EnvConfig.AppEnv != "production" {
+	if !common.EnvConfig.AppEnv.IsProduction() {
 		for _, f := range registerTestControllers {
 			f(apiGroup, db, svc)
 		}
@@ -110,7 +104,17 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 	srv := &http.Server{
 		MaxHeaderBytes:    1 << 20,
 		ReadHeaderTimeout: 10 * time.Second,
-		Handler:           r,
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			// HEAD requests don't get matched by Gin routes, so we convert them to GET
+			// middleware.HeadMiddleware will convert them back to HEAD later
+			if req.Method == http.MethodHead {
+				req.Method = http.MethodGet
+				ctx := context.WithValue(req.Context(), middleware.IsHeadRequestCtxKey{}, true)
+				req = req.WithContext(ctx)
+			}
+
+			r.ServeHTTP(w, req)
+		}),
 	}

 	// Set up the listener
@@ -186,6 +190,7 @@ func initLogger(r *gin.Engine) {
 		"GET /api/application-images/logo",
 		"GET /api/application-images/background",
 		"GET /api/application-images/favicon",
+		"GET /api/application-images/email",
 		"GET /_app",
 		"GET /fonts",
 		"GET /healthz",
--- a/backend/internal/bootstrap/services_bootstrap.go
+++ b/backend/internal/bootstrap/services_bootstrap.go
@@ -12,21 +12,24 @@ import (
 )

 type services struct {
-	appConfigService   *service.AppConfigService
-	appImagesService   *service.AppImagesService
-	emailService       *service.EmailService
-	geoLiteService     *service.GeoLiteService
-	auditLogService    *service.AuditLogService
-	jwtService         *service.JwtService
-	webauthnService    *service.WebAuthnService
-	userService        *service.UserService
-	customClaimService *service.CustomClaimService
-	oidcService        *service.OidcService
-	userGroupService   *service.UserGroupService
-	ldapService        *service.LdapService
-	apiKeyService      *service.ApiKeyService
-	versionService     *service.VersionService
-	fileStorage        storage.FileStorage
+	appConfigService     *service.AppConfigService
+	appImagesService     *service.AppImagesService
+	emailService         *service.EmailService
+	geoLiteService       *service.GeoLiteService
+	auditLogService      *service.AuditLogService
+	jwtService           *service.JwtService
+	webauthnService      *service.WebAuthnService
+	scimService          *service.ScimService
+	scimSchedulerService *service.ScimSchedulerService
+	userService          *service.UserService
+	customClaimService   *service.CustomClaimService
+	oidcService          *service.OidcService
+	userGroupService     *service.UserGroupService
+	ldapService          *service.LdapService
+	apiKeyService        *service.ApiKeyService
+	versionService       *service.VersionService
+	fileStorage          storage.FileStorage
+	appLockService       *service.AppLockService
 }

 // Initializes all services
@@ -40,6 +43,7 @@ func initServices(ctx context.Context, db *gorm.DB, httpClient *http.Client, ima

 	svc.fileStorage = fileStorage
 	svc.appImagesService = service.NewAppImagesService(imageExtensions, fileStorage)
+	svc.appLockService = service.NewAppLockService(db)

 	svc.emailService, err = service.NewEmailService(db, svc.appConfigService)
 	if err != nil {
@@ -66,8 +70,13 @@ func initServices(ctx context.Context, db *gorm.DB, httpClient *http.Client, ima

 	svc.userGroupService = service.NewUserGroupService(db, svc.appConfigService)
 	svc.userService = service.NewUserService(db, svc.jwtService, svc.auditLogService, svc.emailService, svc.appConfigService, svc.customClaimService, svc.appImagesService, fileStorage)
-	svc.ldapService = service.NewLdapService(db, httpClient, svc.appConfigService, svc.userService, svc.userGroupService)
+	svc.ldapService = service.NewLdapService(db, httpClient, svc.appConfigService, svc.userService, svc.userGroupService, fileStorage)
 	svc.apiKeyService = service.NewApiKeyService(db, svc.emailService)
+	svc.scimService = service.NewScimService(db, httpClient)
+	svc.scimSchedulerService, err = service.NewScimSchedulerService(ctx, svc.scimService)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create SCIM scheduler service: %w", err)
+	}

 	svc.versionService = service.NewVersionService(httpClient)

--- a/backend/internal/cmds/export.go
+++ b/backend/internal/cmds/export.go
@@ -0,0 +1,70 @@
+package cmds
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/pocket-id/pocket-id/backend/internal/bootstrap"
+	"github.com/pocket-id/pocket-id/backend/internal/service"
+	"github.com/spf13/cobra"
+)
+
+type exportFlags struct {
+	Path string
+}
+
+func init() {
+	var flags exportFlags
+
+	exportCmd := &cobra.Command{
+		Use:   "export",
+		Short: "Exports all data of Pocket ID into a ZIP file",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runExport(cmd.Context(), flags)
+		},
+	}
+
+	exportCmd.Flags().StringVarP(&flags.Path, "path", "p", "pocket-id-export.zip", "Path to the ZIP file to export the data to, or '-' to write to stdout")
+
+	rootCmd.AddCommand(exportCmd)
+}
+
+// runExport orchestrates the export flow
+func runExport(ctx context.Context, flags exportFlags) error {
+	db, err := bootstrap.NewDatabase()
+	if err != nil {
+		return fmt.Errorf("failed to connect to database: %w", err)
+	}
+
+	storage, err := bootstrap.InitStorage(ctx, db)
+	if err != nil {
+		return fmt.Errorf("failed to initialize storage: %w", err)
+	}
+
+	exportService := service.NewExportService(db, storage)
+
+	var w io.Writer
+	if flags.Path == "-" {
+		w = os.Stdout
+	} else {
+		file, err := os.Create(flags.Path)
+		if err != nil {
+			return fmt.Errorf("failed to create export file: %w", err)
+		}
+		defer file.Close()
+
+		w = file
+	}
+
+	if err := exportService.ExportToZip(ctx, w); err != nil {
+		return fmt.Errorf("failed to export data: %w", err)
+	}
+
+	if flags.Path != "-" {
+		fmt.Printf("Exported data to %s\n", flags.Path)
+	}
+
+	return nil
+}
--- a/backend/internal/cmds/import.go
+++ b/backend/internal/cmds/import.go
@@ -0,0 +1,191 @@
+package cmds
+
+import (
+	"archive/zip"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/spf13/cobra"
+	"gorm.io/gorm"
+
+	"github.com/pocket-id/pocket-id/backend/internal/bootstrap"
+	"github.com/pocket-id/pocket-id/backend/internal/common"
+	"github.com/pocket-id/pocket-id/backend/internal/service"
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+)
+
+type importFlags struct {
+	Path                  string
+	Yes                   bool
+	ForcefullyAcquireLock bool
+}
+
+func init() {
+	var flags importFlags
+
+	importCmd := &cobra.Command{
+		Use:   "import",
+		Short: "Imports all data of Pocket ID from a ZIP file",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runImport(cmd.Context(), flags)
+		},
+	}
+
+	importCmd.Flags().StringVarP(&flags.Path, "path", "p", "pocket-id-export.zip", "Path to the ZIP file to import the data from, or '-' to read from stdin")
+	importCmd.Flags().BoolVarP(&flags.Yes, "yes", "y", false, "Skip confirmation prompts")
+	importCmd.Flags().BoolVarP(&flags.ForcefullyAcquireLock, "forcefully-acquire-lock", "", false, "Forcefully acquire the application lock by terminating the Pocket ID instance")
+
+	rootCmd.AddCommand(importCmd)
+}
+
+// runImport handles the high-level orchestration of the import process
+func runImport(ctx context.Context, flags importFlags) error {
+	if !flags.Yes {
+		ok, err := askForConfirmation()
+		if err != nil {
+			return fmt.Errorf("failed to get confirmation: %w", err)
+		}
+		if !ok {
+			fmt.Println("Aborted")
+			os.Exit(1)
+		}
+	}
+
+	var (
+		zipReader *zip.ReadCloser
+		cleanup   func()
+		err       error
+	)
+
+	if flags.Path == "-" {
+		zipReader, cleanup, err = readZipFromStdin()
+		defer cleanup()
+	} else {
+		zipReader, err = zip.OpenReader(flags.Path)
+	}
+	if err != nil {
+		return fmt.Errorf("failed to open zip: %w", err)
+	}
+	defer zipReader.Close()
+
+	db, err := bootstrap.ConnectDatabase()
+	if err != nil {
+		return err
+	}
+
+	err = acquireImportLock(ctx, db, flags.ForcefullyAcquireLock)
+	if err != nil {
+		return err
+	}
+
+	storage, err := bootstrap.InitStorage(ctx, db)
+	if err != nil {
+		return fmt.Errorf("failed to initialize storage: %w", err)
+	}
+
+	importService := service.NewImportService(db, storage)
+	err = importService.ImportFromZip(ctx, &zipReader.Reader)
+	if err != nil {
+		return fmt.Errorf("failed to import data from zip: %w", err)
+	}
+
+	fmt.Println("Import completed successfully.")
+	return nil
+}
+
+func acquireImportLock(ctx context.Context, db *gorm.DB, force bool) error {
+	// Check if the kv table exists, in case we are starting from an empty database
+	exists, err := utils.DBTableExists(db, "kv")
+	if err != nil {
+		return fmt.Errorf("failed to check if kv table exists: %w", err)
+	}
+	if !exists {
+		// This either means the database is empty, or the import is into an old version of PocketID that doesn't support locks
+		// In either case, there's no lock to acquire
+		fmt.Println("Could not acquire a lock because the 'kv' table does not exist. This is fine if you're importing into a new database, but make sure that there isn't an instance of Pocket ID currently running and using the same database.")
+		return nil
+	}
+
+	// Note that we do not call a deferred Release if the data was imported
+	// This is because we are overriding the contents of the database, so the lock is automatically lost
+	appLockService := service.NewAppLockService(db)
+
+	opCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	waitUntil, err := appLockService.Acquire(opCtx, force)
+	if err != nil {
+		if errors.Is(err, service.ErrLockUnavailable) {
+			//nolint:staticcheck
+			return errors.New("Pocket ID must be stopped before importing data; please stop the running instance or run with --forcefully-acquire-lock to terminate the other instance")
+		}
+		return fmt.Errorf("failed to acquire application lock: %w", err)
+	}
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-time.After(time.Until(waitUntil)):
+	}
+
+	return nil
+}
+
+func askForConfirmation() (bool, error) {
+	fmt.Println("WARNING: This feature is experimental and may not work correctly. Please create a backup before proceeding and report any issues you encounter.")
+	fmt.Println()
+	fmt.Println("WARNING: Import will erase all existing data at the following locations:")
+	fmt.Printf("Database:      %s\n", absolutePathOrOriginal(common.EnvConfig.DbConnectionString))
+	fmt.Printf("Uploads Path:  %s\n", absolutePathOrOriginal(common.EnvConfig.UploadPath))
+
+	ok, err := utils.PromptForConfirmation("Do you want to continue?")
+	if err != nil {
+		return false, err
+	}
+
+	return ok, nil
+}
+
+// absolutePathOrOriginal returns the absolute path of the given path, or the original if it fails
+func absolutePathOrOriginal(path string) string {
+	abs, err := filepath.Abs(path)
+	if err != nil {
+		return path
+	}
+	return abs
+}
+
+func readZipFromStdin() (*zip.ReadCloser, func(), error) {
+	tmpFile, err := os.CreateTemp("", "pocket-id-import-*.zip")
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to create temporary file: %w", err)
+	}
+
+	cleanup := func() {
+		_ = os.Remove(tmpFile.Name())
+	}
+
+	if _, err := io.Copy(tmpFile, os.Stdin); err != nil {
+		tmpFile.Close()
+		cleanup()
+		return nil, nil, fmt.Errorf("failed to read data from stdin: %w", err)
+	}
+
+	if err := tmpFile.Close(); err != nil {
+		cleanup()
+		return nil, nil, fmt.Errorf("failed to close temporary file: %w", err)
+	}
+
+	r, err := zip.OpenReader(tmpFile.Name())
+	if err != nil {
+		cleanup()
+		return nil, nil, err
+	}
+
+	return r, cleanup, nil
+}
--- a/backend/internal/cmds/key_rotate.go
+++ b/backend/internal/cmds/key_rotate.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"os"
 	"strings"

 	"github.com/lestrrat-go/jwx/v3/jwa"
@@ -78,7 +79,7 @@ func keyRotate(ctx context.Context, flags keyRotateFlags, db *gorm.DB, envConfig
 		}
 		if !ok {
 			fmt.Println("Aborted")
-			return nil
+			os.Exit(1)
 		}
 	}

--- a/backend/internal/cmds/key_rotate_test.go
+++ b/backend/internal/cmds/key_rotate_test.go
@@ -1,8 +1,6 @@
 package cmds

 import (
-	"os"
-	"path/filepath"
 	"testing"

 	"github.com/stretchr/testify/assert"
@@ -69,78 +67,14 @@ func TestKeyRotate(t *testing.T) {

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			t.Run("file storage", func(t *testing.T) {
-				testKeyRotateWithFileStorage(t, tt.flags, tt.wantErr, tt.errMsg)
-			})
-
-			t.Run("database storage", func(t *testing.T) {
-				testKeyRotateWithDatabaseStorage(t, tt.flags, tt.wantErr, tt.errMsg)
-			})
+			testKeyRotateWithDatabaseStorage(t, tt.flags, tt.wantErr, tt.errMsg)
 		})
 	}
 }

-func testKeyRotateWithFileStorage(t *testing.T, flags keyRotateFlags, wantErr bool, errMsg string) {
-	// Create temporary directory for keys
-	tempDir := t.TempDir()
-	keysPath := filepath.Join(tempDir, "keys")
-	err := os.MkdirAll(keysPath, 0755)
-	require.NoError(t, err)
-
-	// Set up file storage config
-	envConfig := &common.EnvConfigSchema{
-		KeysStorage: "file",
-		KeysPath:    keysPath,
-	}
-
-	// Create test database
-	db := testingutils.NewDatabaseForTest(t)
-
-	// Initialize app config service and create instance
-	appConfigService, err := service.NewAppConfigService(t.Context(), db)
-	require.NoError(t, err)
-	instanceID := appConfigService.GetDbConfig().InstanceID.Value
-
-	// Check if key exists before rotation
-	keyProvider, err := jwkutils.GetKeyProvider(db, envConfig, instanceID)
-	require.NoError(t, err)
-
-	// Run the key rotation
-	err = keyRotate(t.Context(), flags, db, envConfig)
-
-	if wantErr {
-		require.Error(t, err)
-		if errMsg != "" {
-			require.ErrorContains(t, err, errMsg)
-		}
-		return
-	}
-
-	require.NoError(t, err)
-
-	// Verify key was created
-	key, err := keyProvider.LoadKey()
-	require.NoError(t, err)
-	require.NotNil(t, key)
-
-	// Verify the algorithm matches what we requested
-	alg, _ := key.Algorithm()
-	assert.NotEmpty(t, alg)
-	if flags.Alg != "" {
-		expectedAlg := flags.Alg
-		if expectedAlg == "EdDSA" {
-			// EdDSA keys should have the EdDSA algorithm
-			assert.Equal(t, "EdDSA", alg.String())
-		} else {
-			assert.Equal(t, expectedAlg, alg.String())
-		}
-	}
-}
-
 func testKeyRotateWithDatabaseStorage(t *testing.T, flags keyRotateFlags, wantErr bool, errMsg string) {
 	// Set up database storage config
 	envConfig := &common.EnvConfigSchema{
-		KeysStorage:   "database",
 		EncryptionKey: []byte("test-encryption-key-characters-long"),
 	}

--- a/backend/internal/cmds/one_time_access_token.go
+++ b/backend/internal/cmds/one_time_access_token.go
@@ -51,7 +51,7 @@ var oneTimeAccessTokenCmd = &cobra.Command{
 			}

 			// Create a new access token that expires in 1 hour
-			oneTimeAccessToken, txErr = service.NewOneTimeAccessToken(user.ID, time.Hour)
+			oneTimeAccessToken, txErr = service.NewOneTimeAccessToken(user.ID, time.Hour, false)
 			if txErr != nil {
 				return fmt.Errorf("failed to generate access token: %w", txErr)
 			}
--- a/backend/internal/cmds/root.go
+++ b/backend/internal/cmds/root.go
@@ -12,9 +12,10 @@ import (
 )

 var rootCmd = &cobra.Command{
-	Use:   "pocket-id",
-	Short: "A simple and easy-to-use OIDC provider that allows users to authenticate with their passkeys to your services.",
-	Long:  "By default, this command starts the pocket-id server.",
+	Use:          "pocket-id",
+	Short:        "A simple and easy-to-use OIDC provider that allows users to authenticate with their passkeys to your services.",
+	Long:         "By default, this command starts the pocket-id server.",
+	SilenceUsage: true,
 	Run: func(cmd *cobra.Command, args []string) {
 		// Start the server
 		err := bootstrap.Bootstrap(cmd.Context())
--- a/backend/internal/common/env_config.go
+++ b/backend/internal/common/env_config.go
@@ -15,6 +15,7 @@ import (
 	_ "github.com/joho/godotenv/autoload"
 )

+type AppEnv string
 type DbProvider string

 const (
@@ -25,6 +26,9 @@ const (
 )

 const (
+	AppEnvProduction        AppEnv     = "production"
+	AppEnvDevelopment       AppEnv     = "development"
+	AppEnvTest              AppEnv     = "test"
 	DbProviderSqlite        DbProvider = "sqlite"
 	DbProviderPostgres      DbProvider = "postgres"
 	MaxMindGeoLiteCityUrl   string     = "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&license_key=%s&suffix=tar.gz"
@@ -34,38 +38,42 @@ const (
 )

 type EnvConfigSchema struct {
-	AppEnv             string     `env:"APP_ENV" options:"toLower"`
-	LogLevel           string     `env:"LOG_LEVEL" options:"toLower"`
-	AppURL             string     `env:"APP_URL" options:"toLower,trimTrailingSlash"`
-	DbProvider         DbProvider `env:"DB_PROVIDER" options:"toLower"`
-	DbConnectionString string     `env:"DB_CONNECTION_STRING" options:"file"`
-	FileBackend        string     `env:"FILE_BACKEND" options:"toLower"`
-	UploadPath         string     `env:"UPLOAD_PATH"`
-	S3Bucket           string     `env:"S3_BUCKET"`
-	S3Region           string     `env:"S3_REGION"`
-	S3Endpoint         string     `env:"S3_ENDPOINT"`
-	S3AccessKeyID      string     `env:"S3_ACCESS_KEY_ID"`
-	S3SecretAccessKey  string     `env:"S3_SECRET_ACCESS_KEY"`
-	S3ForcePathStyle   bool       `env:"S3_FORCE_PATH_STYLE"`
-	KeysPath           string     `env:"KEYS_PATH"`
-	KeysStorage        string     `env:"KEYS_STORAGE"`
-	EncryptionKey      []byte     `env:"ENCRYPTION_KEY" options:"file"`
-	Port               string     `env:"PORT"`
-	Host               string     `env:"HOST" options:"toLower"`
-	UnixSocket         string     `env:"UNIX_SOCKET"`
-	UnixSocketMode     string     `env:"UNIX_SOCKET_MODE"`
-	MaxMindLicenseKey  string     `env:"MAXMIND_LICENSE_KEY" options:"file"`
-	GeoLiteDBPath      string     `env:"GEOLITE_DB_PATH"`
-	GeoLiteDBUrl       string     `env:"GEOLITE_DB_URL"`
-	LocalIPv6Ranges    string     `env:"LOCAL_IPV6_RANGES"`
-	UiConfigDisabled   bool       `env:"UI_CONFIG_DISABLED"`
-	MetricsEnabled     bool       `env:"METRICS_ENABLED"`
-	TracingEnabled     bool       `env:"TRACING_ENABLED"`
-	LogJSON            bool       `env:"LOG_JSON"`
-	TrustProxy         bool       `env:"TRUST_PROXY"`
-	AnalyticsDisabled  bool       `env:"ANALYTICS_DISABLED"`
-	AllowDowngrade     bool       `env:"ALLOW_DOWNGRADE"`
-	InternalAppURL     string     `env:"INTERNAL_APP_URL"`
+	AppEnv                AppEnv `env:"APP_ENV" options:"toLower"`
+	EncryptionKey         []byte `env:"ENCRYPTION_KEY" options:"file"`
+	AppURL                string `env:"APP_URL" options:"toLower,trimTrailingSlash"`
+	DbProvider            DbProvider
+	DbConnectionString    string `env:"DB_CONNECTION_STRING" options:"file"`
+	TrustProxy            bool   `env:"TRUST_PROXY"`
+	AuditLogRetentionDays int    `env:"AUDIT_LOG_RETENTION_DAYS"`
+	AnalyticsDisabled     bool   `env:"ANALYTICS_DISABLED"`
+	AllowDowngrade        bool   `env:"ALLOW_DOWNGRADE"`
+	InternalAppURL        string `env:"INTERNAL_APP_URL"`
+	UiConfigDisabled      bool   `env:"UI_CONFIG_DISABLED"`
+
+	FileBackend                     string `env:"FILE_BACKEND" options:"toLower"`
+	UploadPath                      string `env:"UPLOAD_PATH"`
+	S3Bucket                        string `env:"S3_BUCKET"`
+	S3Region                        string `env:"S3_REGION"`
+	S3Endpoint                      string `env:"S3_ENDPOINT"`
+	S3AccessKeyID                   string `env:"S3_ACCESS_KEY_ID"`
+	S3SecretAccessKey               string `env:"S3_SECRET_ACCESS_KEY"`
+	S3ForcePathStyle                bool   `env:"S3_FORCE_PATH_STYLE"`
+	S3DisableDefaultIntegrityChecks bool   `env:"S3_DISABLE_DEFAULT_INTEGRITY_CHECKS"`
+
+	Port            string `env:"PORT"`
+	Host            string `env:"HOST" options:"toLower"`
+	UnixSocket      string `env:"UNIX_SOCKET"`
+	UnixSocketMode  string `env:"UNIX_SOCKET_MODE"`
+	LocalIPv6Ranges string `env:"LOCAL_IPV6_RANGES"`
+
+	MaxMindLicenseKey string `env:"MAXMIND_LICENSE_KEY" options:"file"`
+	GeoLiteDBPath     string `env:"GEOLITE_DB_PATH"`
+	GeoLiteDBUrl      string `env:"GEOLITE_DB_URL"`
+
+	LogLevel       string `env:"LOG_LEVEL" options:"toLower"`
+	MetricsEnabled bool   `env:"METRICS_ENABLED"`
+	TracingEnabled bool   `env:"TRACING_ENABLED"`
+	LogJSON        bool   `env:"LOG_JSON"`
 }

 var EnvConfig = defaultConfig()
@@ -80,16 +88,16 @@ func init() {

 func defaultConfig() EnvConfigSchema {
 	return EnvConfigSchema{
-		AppEnv:        "production",
-		LogLevel:      "info",
-		DbProvider:    "sqlite",
-		FileBackend:   "fs",
-		KeysPath:      "data/keys",
-		AppURL:        AppUrl,
-		Port:          "1411",
-		Host:          "0.0.0.0",
-		GeoLiteDBPath: "data/GeoLite2-City.mmdb",
-		GeoLiteDBUrl:  MaxMindGeoLiteCityUrl,
+		AppEnv:                AppEnvProduction,
+		LogLevel:              "info",
+		DbProvider:            "sqlite",
+		FileBackend:           "filesystem",
+		AuditLogRetentionDays: 90,
+		AppURL:                AppUrl,
+		Port:                  "1411",
+		Host:                  "0.0.0.0",
+		GeoLiteDBPath:         "data/GeoLite2-City.mmdb",
+		GeoLiteDBUrl:          MaxMindGeoLiteCityUrl,
 	}
 }

@@ -112,32 +120,28 @@ func parseEnvConfig() error {
 		return fmt.Errorf("error preparing env config: %w", err)
 	}

-	err = validateEnvConfig(&EnvConfig)
-	if err != nil {
-		return err
-	}
-
 	return nil

 }

-// validateEnvConfig checks the EnvConfig for required fields and valid values
-func validateEnvConfig(config *EnvConfigSchema) error {
+// ValidateEnvConfig checks the EnvConfig for required fields and valid values
+func ValidateEnvConfig(config *EnvConfigSchema) error {
 	if _, err := sloggin.ParseLevel(config.LogLevel); err != nil {
 		return errors.New("invalid LOG_LEVEL value. Must be 'debug', 'info', 'warn' or 'error'")
 	}

-	switch config.DbProvider {
-	case DbProviderSqlite:
-		if config.DbConnectionString == "" {
-			config.DbConnectionString = defaultSqliteConnString
-		}
-	case DbProviderPostgres:
-		if config.DbConnectionString == "" {
-			return errors.New("missing required env var 'DB_CONNECTION_STRING' for Postgres database")
-		}
+	if len(config.EncryptionKey) < 16 {
+		return errors.New("ENCRYPTION_KEY must be at least 16 bytes long")
+	}
+
+	switch {
+	case config.DbConnectionString == "":
+		config.DbProvider = DbProviderSqlite
+		config.DbConnectionString = defaultSqliteConnString
+	case strings.HasPrefix(config.DbConnectionString, "postgres://") || strings.HasPrefix(config.DbConnectionString, "postgresql://"):
+		config.DbProvider = DbProviderPostgres
 	default:
-		return errors.New("invalid DB_PROVIDER value. Must be 'sqlite' or 'postgres'")
+		config.DbProvider = DbProviderSqlite
 	}

 	parsedAppUrl, err := url.Parse(config.AppURL)
@@ -161,31 +165,15 @@ func validateEnvConfig(config *EnvConfigSchema) error {
 		}
 	}

-	switch config.KeysStorage {
-	// KeysStorage defaults to "file" if empty
-	case "":
-		config.KeysStorage = "file"
-	case "database":
-		if config.EncryptionKey == nil {
-			return errors.New("ENCRYPTION_KEY must be non-empty when KEYS_STORAGE is database")
-		}
-	case "file":
-		// All good, these are valid values
-	default:
-		return fmt.Errorf("invalid value for KEYS_STORAGE: %s", config.KeysStorage)
-	}
-
 	switch config.FileBackend {
-	case "s3":
-		if config.KeysStorage == "file" {
-			return errors.New("KEYS_STORAGE cannot be 'file' when FILE_BACKEND is 's3'")
-		}
-	case "", "fs":
+	case "s3", "database":
+		// All good, these are valid values
+	case "", "filesystem":
 		if config.UploadPath == "" {
 			config.UploadPath = defaultFsUploadPath
 		}
 	default:
-		return errors.New("invalid FILE_BACKEND value. Must be 'fs' or 's3'")
+		return errors.New("invalid FILE_BACKEND value. Must be 'filesystem', 'database', or 's3'")
 	}

 	// Validate LOCAL_IPV6_RANGES
@@ -207,6 +195,10 @@ func validateEnvConfig(config *EnvConfigSchema) error {

 	}

+	if config.AuditLogRetentionDays <= 0 {
+		return errors.New("AUDIT_LOG_RETENTION_DAYS must be greater than 0")
+	}
+
 	return nil

 }
@@ -286,3 +278,11 @@ func resolveFileBasedEnvVariable(field reflect.Value, fieldType reflect.StructFi

 	return nil
 }
+
+func (a AppEnv) IsProduction() bool {
+	return a == AppEnvProduction
+}
+
+func (a AppEnv) IsTest() bool {
+	return a == AppEnvTest
+}
--- a/backend/internal/common/env_config_test.go
+++ b/backend/internal/common/env_config_test.go
@@ -8,6 +8,20 @@ import (
 	"github.com/stretchr/testify/require"
 )

+func parseAndValidateEnvConfig(t *testing.T) error {
+	t.Helper()
+
+	if _, exists := os.LookupEnv("ENCRYPTION_KEY"); !exists {
+		t.Setenv("ENCRYPTION_KEY", "0123456789abcdef")
+	}
+
+	if err := parseEnvConfig(); err != nil {
+		return err
+	}
+
+	return ValidateEnvConfig(&EnvConfig)
+}
+
 func TestParseEnvConfig(t *testing.T) {
 	// Store original config to restore later
 	originalConfig := EnvConfig
@@ -17,11 +31,10 @@ func TestParseEnvConfig(t *testing.T) {

 	t.Run("should parse valid SQLite config correctly", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "SQLITE") // should be lowercased automatically
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "HTTP://LOCALHOST:3000")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
 		assert.Equal(t, DbProviderSqlite, EnvConfig.DbProvider)
 		assert.Equal(t, "http://localhost:3000", EnvConfig.AppURL)
@@ -29,147 +42,76 @@ func TestParseEnvConfig(t *testing.T) {

 	t.Run("should parse valid Postgres config correctly", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "POSTGRES")
 		t.Setenv("DB_CONNECTION_STRING", "postgres://user:pass@localhost/db")
 		t.Setenv("APP_URL", "https://example.com")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
 		assert.Equal(t, DbProviderPostgres, EnvConfig.DbProvider)
 	})

-	t.Run("should fail with invalid DB_PROVIDER", func(t *testing.T) {
+	t.Run("should fail when ENCRYPTION_KEY is too short", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "invalid")
-		t.Setenv("DB_CONNECTION_STRING", "test")
+		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000")
+		t.Setenv("ENCRYPTION_KEY", "short")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
-		assert.ErrorContains(t, err, "invalid DB_PROVIDER value")
+		assert.ErrorContains(t, err, "ENCRYPTION_KEY must be at least 16 bytes long")
 	})

 	t.Run("should set default SQLite connection string when DB_CONNECTION_STRING is empty", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("APP_URL", "http://localhost:3000")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
 		assert.Equal(t, defaultSqliteConnString, EnvConfig.DbConnectionString)
 	})

-	t.Run("should fail when Postgres DB_CONNECTION_STRING is missing", func(t *testing.T) {
-		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "postgres")
-		t.Setenv("APP_URL", "http://localhost:3000")
-
-		err := parseEnvConfig()
-		require.Error(t, err)
-		assert.ErrorContains(t, err, "missing required env var 'DB_CONNECTION_STRING' for Postgres")
-	})
-
 	t.Run("should fail with invalid APP_URL", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "€://not-a-valid-url")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
 		assert.ErrorContains(t, err, "APP_URL is not a valid URL")
 	})

 	t.Run("should fail when APP_URL contains path", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000/path")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
 		assert.ErrorContains(t, err, "APP_URL must not contain a path")
 	})

 	t.Run("should fail with invalid INTERNAL_APP_URL", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("INTERNAL_APP_URL", "€://not-a-valid-url")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
 		assert.ErrorContains(t, err, "INTERNAL_APP_URL is not a valid URL")
 	})

 	t.Run("should fail when INTERNAL_APP_URL contains path", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("INTERNAL_APP_URL", "http://localhost:3000/path")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
 		assert.ErrorContains(t, err, "INTERNAL_APP_URL must not contain a path")
 	})

-	t.Run("should default KEYS_STORAGE to 'file' when empty", func(t *testing.T) {
-		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
-		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
-		t.Setenv("APP_URL", "http://localhost:3000")
-
-		err := parseEnvConfig()
-		require.NoError(t, err)
-		assert.Equal(t, "file", EnvConfig.KeysStorage)
-	})
-
-	t.Run("should fail when KEYS_STORAGE is 'database' but no encryption key", func(t *testing.T) {
-		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
-		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
-		t.Setenv("APP_URL", "http://localhost:3000")
-		t.Setenv("KEYS_STORAGE", "database")
-
-		err := parseEnvConfig()
-		require.Error(t, err)
-		assert.ErrorContains(t, err, "ENCRYPTION_KEY must be non-empty when KEYS_STORAGE is database")
-	})
-
-	t.Run("should accept valid KEYS_STORAGE values", func(t *testing.T) {
-		validStorageTypes := []string{"file", "database"}
-
-		for _, storage := range validStorageTypes {
-			EnvConfig = defaultConfig()
-			t.Setenv("DB_PROVIDER", "sqlite")
-			t.Setenv("DB_CONNECTION_STRING", "file:test.db")
-			t.Setenv("APP_URL", "http://localhost:3000")
-			t.Setenv("KEYS_STORAGE", storage)
-			if storage == "database" {
-				t.Setenv("ENCRYPTION_KEY", "test-key")
-			}
-
-			err := parseEnvConfig()
-			require.NoError(t, err)
-			assert.Equal(t, storage, EnvConfig.KeysStorage)
-		}
-	})
-
-	t.Run("should fail with invalid KEYS_STORAGE value", func(t *testing.T) {
-		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
-		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
-		t.Setenv("APP_URL", "http://localhost:3000")
-		t.Setenv("KEYS_STORAGE", "invalid")
-
-		err := parseEnvConfig()
-		require.Error(t, err)
-		assert.ErrorContains(t, err, "invalid value for KEYS_STORAGE")
-	})
-
 	t.Run("should parse boolean environment variables correctly", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000")
 		t.Setenv("UI_CONFIG_DISABLED", "true")
@@ -178,7 +120,7 @@ func TestParseEnvConfig(t *testing.T) {
 		t.Setenv("TRUST_PROXY", "true")
 		t.Setenv("ANALYTICS_DISABLED", "false")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
 		assert.True(t, EnvConfig.UiConfigDisabled)
 		assert.True(t, EnvConfig.MetricsEnabled)
@@ -187,23 +129,56 @@ func TestParseEnvConfig(t *testing.T) {
 		assert.False(t, EnvConfig.AnalyticsDisabled)
 	})

+	t.Run("should default audit log retention days to 90", func(t *testing.T) {
+		EnvConfig = defaultConfig()
+		t.Setenv("DB_PROVIDER", "sqlite")
+		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
+		t.Setenv("APP_URL", "http://localhost:3000")
+
+		err := parseEnvConfig()
+		require.NoError(t, err)
+		assert.Equal(t, 90, EnvConfig.AuditLogRetentionDays)
+	})
+
+	t.Run("should parse audit log retention days override", func(t *testing.T) {
+		EnvConfig = defaultConfig()
+		t.Setenv("DB_PROVIDER", "sqlite")
+		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
+		t.Setenv("APP_URL", "http://localhost:3000")
+		t.Setenv("AUDIT_LOG_RETENTION_DAYS", "365")
+
+		err := parseEnvConfig()
+		require.NoError(t, err)
+		assert.Equal(t, 365, EnvConfig.AuditLogRetentionDays)
+	})
+
+	t.Run("should fail when AUDIT_LOG_RETENTION_DAYS is non-positive", func(t *testing.T) {
+		EnvConfig = defaultConfig()
+		t.Setenv("DB_PROVIDER", "sqlite")
+		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
+		t.Setenv("APP_URL", "http://localhost:3000")
+		t.Setenv("AUDIT_LOG_RETENTION_DAYS", "0")
+
+		err := parseAndValidateEnvConfig(t)
+		require.Error(t, err)
+		assert.ErrorContains(t, err, "AUDIT_LOG_RETENTION_DAYS must be greater than 0")
+	})
+
 	t.Run("should parse string environment variables correctly", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "postgres")
 		t.Setenv("DB_CONNECTION_STRING", "postgres://test")
 		t.Setenv("APP_URL", "https://prod.example.com")
-		t.Setenv("APP_ENV", "STAGING")
+		t.Setenv("APP_ENV", "PRODUCTION")
 		t.Setenv("UPLOAD_PATH", "/custom/uploads")
-		t.Setenv("KEYS_PATH", "/custom/keys")
 		t.Setenv("PORT", "8080")
 		t.Setenv("HOST", "LOCALHOST")
 		t.Setenv("UNIX_SOCKET", "/tmp/app.sock")
 		t.Setenv("MAXMIND_LICENSE_KEY", "test-license")
 		t.Setenv("GEOLITE_DB_PATH", "/custom/geolite.mmdb")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
-		assert.Equal(t, "staging", EnvConfig.AppEnv) // lowercased
+		assert.Equal(t, AppEnvProduction, EnvConfig.AppEnv) // lowercased
 		assert.Equal(t, "/custom/uploads", EnvConfig.UploadPath)
 		assert.Equal(t, "8080", EnvConfig.Port)
 		assert.Equal(t, "localhost", EnvConfig.Host) // lowercased
@@ -211,38 +186,24 @@ func TestParseEnvConfig(t *testing.T) {

 	t.Run("should normalize file backend and default upload path", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000")
-		t.Setenv("FILE_BACKEND", "FS")
+		t.Setenv("FILE_BACKEND", "FILESYSTEM")
 		t.Setenv("UPLOAD_PATH", "")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.NoError(t, err)
-		assert.Equal(t, "fs", EnvConfig.FileBackend)
+		assert.Equal(t, "filesystem", EnvConfig.FileBackend)
 		assert.Equal(t, defaultFsUploadPath, EnvConfig.UploadPath)
 	})

-	t.Run("should fail when FILE_BACKEND is s3 but keys are stored on filesystem", func(t *testing.T) {
-		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
-		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
-		t.Setenv("APP_URL", "http://localhost:3000")
-		t.Setenv("FILE_BACKEND", "s3")
-
-		err := parseEnvConfig()
-		require.Error(t, err)
-		assert.ErrorContains(t, err, "KEYS_STORAGE cannot be 'file' when FILE_BACKEND is 's3'")
-	})
-
 	t.Run("should fail with invalid FILE_BACKEND value", func(t *testing.T) {
 		EnvConfig = defaultConfig()
-		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000")
 		t.Setenv("FILE_BACKEND", "invalid")

-		err := parseEnvConfig()
+		err := parseAndValidateEnvConfig(t)
 		require.Error(t, err)
 		assert.ErrorContains(t, err, "invalid FILE_BACKEND value")
 	})
@@ -279,7 +240,7 @@ func TestPrepareEnvConfig_FileBasedAndToLower(t *testing.T) {
 		err := prepareEnvConfig(&config)
 		require.NoError(t, err)

-		assert.Equal(t, "staging", config.AppEnv)
+		assert.Equal(t, AppEnv("staging"), config.AppEnv)
 		assert.Equal(t, "localhost", config.Host)
 		assert.Equal(t, []byte(encryptionKeyContent), config.EncryptionKey)
 		assert.Equal(t, dbConnContent, config.DbConnectionString)
--- a/backend/internal/common/errors.go
+++ b/backend/internal/common/errors.go
@@ -38,6 +38,13 @@ type TokenInvalidOrExpiredError struct{}
 func (e *TokenInvalidOrExpiredError) Error() string       { return "token is invalid or expired" }
 func (e *TokenInvalidOrExpiredError) HttpStatusCode() int { return 400 }

+type DeviceCodeInvalid struct{}
+
+func (e *DeviceCodeInvalid) Error() string {
+	return "one time access code must be used on the device it was generated for"
+}
+func (e *DeviceCodeInvalid) HttpStatusCode() int { return 400 }
+
 type TokenInvalidError struct{}

 func (e *TokenInvalidError) Error() string {
--- a/backend/internal/controller/app_images_controller.go
+++ b/backend/internal/controller/app_images_controller.go
@@ -23,11 +23,13 @@ func NewAppImagesController(
 	}

 	group.GET("/application-images/logo", controller.getLogoHandler)
+	group.GET("/application-images/email", controller.getEmailLogoHandler)
 	group.GET("/application-images/background", controller.getBackgroundImageHandler)
 	group.GET("/application-images/favicon", controller.getFaviconHandler)
 	group.GET("/application-images/default-profile-picture", authMiddleware.Add(), controller.getDefaultProfilePicture)

 	group.PUT("/application-images/logo", authMiddleware.Add(), controller.updateLogoHandler)
+	group.PUT("/application-images/email", authMiddleware.Add(), controller.updateEmailLogoHandler)
 	group.PUT("/application-images/background", authMiddleware.Add(), controller.updateBackgroundImageHandler)
 	group.PUT("/application-images/favicon", authMiddleware.Add(), controller.updateFaviconHandler)
 	group.PUT("/application-images/default-profile-picture", authMiddleware.Add(), controller.updateDefaultProfilePicture)
@@ -59,6 +61,18 @@ func (c *AppImagesController) getLogoHandler(ctx *gin.Context) {
 	c.getImage(ctx, imageName)
 }

+// getEmailLogoHandler godoc
+// @Summary Get email logo image
+// @Description Get the email logo image for use in emails
+// @Tags Application Images
+// @Produce image/png
+// @Produce image/jpeg
+// @Success 200 {file} binary "Email logo image"
+// @Router /api/application-images/email [get]
+func (c *AppImagesController) getEmailLogoHandler(ctx *gin.Context) {
+	c.getImage(ctx, "logoEmail")
+}
+
 // getBackgroundImageHandler godoc
 // @Summary Get background image
 // @Description Get the background image for the application
@@ -124,6 +138,37 @@ func (c *AppImagesController) updateLogoHandler(ctx *gin.Context) {
 	ctx.Status(http.StatusNoContent)
 }

+// updateEmailLogoHandler godoc
+// @Summary Update email logo
+// @Description Update the email logo for use in emails
+// @Tags Application Images
+// @Accept multipart/form-data
+// @Param file formData file true "Email logo image file"
+// @Success 204 "No Content"
+// @Router /api/application-images/email [put]
+func (c *AppImagesController) updateEmailLogoHandler(ctx *gin.Context) {
+	file, err := ctx.FormFile("file")
+	if err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	fileType := utils.GetFileExtension(file.Filename)
+	mimeType := utils.GetImageMimeType(fileType)
+
+	if mimeType != "image/png" && mimeType != "image/jpeg" {
+		_ = ctx.Error(&common.WrongFileTypeError{ExpectedFileType: ".png or .jpg/jpeg"})
+		return
+	}
+
+	if err := c.appImagesService.UpdateImage(ctx.Request.Context(), file, "logoEmail"); err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	ctx.Status(http.StatusNoContent)
+}
+
 // updateBackgroundImageHandler godoc
 // @Summary Update background image
 // @Description Update the application background image
--- a/backend/internal/controller/e2etest_controller.go
+++ b/backend/internal/controller/e2etest_controller.go
@@ -40,6 +40,11 @@ func (tc *TestController) resetAndSeedHandler(c *gin.Context) {
 		return
 	}

+	if err := tc.TestService.ResetLock(c.Request.Context()); err != nil {
+		_ = c.Error(err)
+		return
+	}
+
 	if err := tc.TestService.ResetApplicationImages(c.Request.Context()); err != nil {
 		_ = c.Error(err)
 		return
@@ -69,8 +74,6 @@ func (tc *TestController) resetAndSeedHandler(c *gin.Context) {
 		}
 	}

-	tc.TestService.SetJWTKeys()
-
 	c.Status(http.StatusNoContent)
 }

--- a/backend/internal/controller/oidc_controller.go
+++ b/backend/internal/controller/oidc_controller.go
@@ -63,6 +63,8 @@ func NewOidcController(group *gin.RouterGroup, authMiddleware *middleware.AuthMi

 	group.GET("/oidc/users/me/clients", authMiddleware.WithAdminNotRequired().Add(), oc.listOwnAccessibleClientsHandler)

+	group.GET("/oidc/clients/:id/scim-service-provider", authMiddleware.Add(), oc.getClientScimServiceProviderHandler)
+
 }

 type OidcController struct {
@@ -587,7 +589,6 @@ func (oc *OidcController) updateClientLogoHandler(c *gin.Context) {
 	}

 	c.Status(http.StatusNoContent)
-
 }

 // deleteClientLogoHandler godoc
@@ -614,7 +615,6 @@ func (oc *OidcController) deleteClientLogoHandler(c *gin.Context) {
 	}

 	c.Status(http.StatusNoContent)
-
 }

 // updateAllowedUserGroupsHandler godoc
@@ -847,3 +847,29 @@ func (oc *OidcController) getClientPreviewHandler(c *gin.Context) {

 	c.JSON(http.StatusOK, preview)
 }
+
+// getClientScimServiceProviderHandler godoc
+// @Summary Get SCIM service provider
+// @Description Get the SCIM service provider configuration for an OIDC client
+// @Tags OIDC
+// @Produce json
+// @Param id path string true "Client ID"
+// @Success 200 {object} dto.ScimServiceProviderDTO "SCIM service provider configuration"
+// @Router /api/oidc/clients/{id}/scim-service-provider [get]
+func (oc *OidcController) getClientScimServiceProviderHandler(c *gin.Context) {
+	clientID := c.Param("id")
+
+	provider, err := oc.oidcService.GetClientScimServiceProvider(c.Request.Context(), clientID)
+	if err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	var providerDto dto.ScimServiceProviderDTO
+	if err := dto.MapStruct(provider, &providerDto); err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	c.JSON(http.StatusOK, providerDto)
+}
--- a/backend/internal/controller/scim_controller.go
+++ b/backend/internal/controller/scim_controller.go
@@ -0,0 +1,122 @@
+package controller
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/pocket-id/pocket-id/backend/internal/dto"
+	"github.com/pocket-id/pocket-id/backend/internal/middleware"
+	"github.com/pocket-id/pocket-id/backend/internal/service"
+)
+
+func NewScimController(group *gin.RouterGroup, authMiddleware *middleware.AuthMiddleware, scimService *service.ScimService) {
+	ugc := ScimController{
+		scimService: scimService,
+	}
+
+	group.POST("/scim/service-provider", authMiddleware.Add(), ugc.createServiceProviderHandler)
+	group.POST("/scim/service-provider/:id/sync", authMiddleware.Add(), ugc.syncServiceProviderHandler)
+	group.PUT("/scim/service-provider/:id", authMiddleware.Add(), ugc.updateServiceProviderHandler)
+	group.DELETE("/scim/service-provider/:id", authMiddleware.Add(), ugc.deleteServiceProviderHandler)
+}
+
+type ScimController struct {
+	scimService *service.ScimService
+}
+
+// syncServiceProviderHandler godoc
+// @Summary Sync SCIM service provider
+// @Description Trigger synchronization for a SCIM service provider
+// @Tags SCIM
+// @Param id path string true "Service Provider ID"
+// @Success 200 "OK"
+// @Router /api/scim/service-provider/{id}/sync [post]
+func (c *ScimController) syncServiceProviderHandler(ctx *gin.Context) {
+	err := c.scimService.SyncServiceProvider(ctx.Request.Context(), ctx.Param("id"))
+	if err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	ctx.Status(http.StatusOK)
+}
+
+// createServiceProviderHandler godoc
+// @Summary Create SCIM service provider
+// @Description Create a new SCIM service provider
+// @Tags SCIM
+// @Accept json
+// @Produce json
+// @Param serviceProvider body dto.ScimServiceProviderCreateDTO true "SCIM service provider information"
+// @Success 201 {object} dto.ScimServiceProviderDTO "Created SCIM service provider"
+// @Router /api/scim/service-provider [post]
+func (c *ScimController) createServiceProviderHandler(ctx *gin.Context) {
+	var input dto.ScimServiceProviderCreateDTO
+	if err := ctx.ShouldBindJSON(&input); err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	provider, err := c.scimService.CreateServiceProvider(ctx.Request.Context(), &input)
+	if err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	var providerDTO dto.ScimServiceProviderDTO
+	if err := dto.MapStruct(provider, &providerDTO); err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	ctx.JSON(http.StatusCreated, providerDTO)
+}
+
+// updateServiceProviderHandler godoc
+// @Summary Update SCIM service provider
+// @Description Update an existing SCIM service provider
+// @Tags SCIM
+// @Accept json
+// @Produce json
+// @Param id path string true "Service Provider ID"
+// @Param serviceProvider body dto.ScimServiceProviderCreateDTO true "SCIM service provider information"
+// @Success 200 {object} dto.ScimServiceProviderDTO "Updated SCIM service provider"
+// @Router /api/scim/service-provider/{id} [put]
+func (c *ScimController) updateServiceProviderHandler(ctx *gin.Context) {
+	var input dto.ScimServiceProviderCreateDTO
+	if err := ctx.ShouldBindJSON(&input); err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	provider, err := c.scimService.UpdateServiceProvider(ctx.Request.Context(), ctx.Param("id"), &input)
+	if err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	var providerDTO dto.ScimServiceProviderDTO
+	if err := dto.MapStruct(provider, &providerDTO); err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	ctx.JSON(http.StatusOK, providerDTO)
+}
+
+// deleteServiceProviderHandler godoc
+// @Summary Delete SCIM service provider
+// @Description Delete a SCIM service provider by ID
+// @Tags SCIM
+// @Param id path string true "Service Provider ID"
+// @Success 204 "No Content"
+// @Router /api/scim/service-provider/{id} [delete]
+func (c *ScimController) deleteServiceProviderHandler(ctx *gin.Context) {
+	err := c.scimService.DeleteServiceProvider(ctx.Request.Context(), ctx.Param("id"))
+	if err != nil {
+		_ = ctx.Error(err)
+		return
+	}
+
+	ctx.Status(http.StatusNoContent)
+}
--- a/backend/internal/controller/user_controller.go
+++ b/backend/internal/controller/user_controller.go
@@ -72,7 +72,7 @@ type UserController struct {
 // @Description Retrieve all groups a specific user belongs to
 // @Tags Users,User Groups
 // @Param id path string true "User ID"
-// @Success 200 {array} dto.UserGroupDtoWithUsers
+// @Success 200 {array} dto.UserGroupDto
 // @Router /api/users/{id}/groups [get]
 func (uc *UserController) getUserGroupsHandler(c *gin.Context) {
 	userID := c.Param("id")
@@ -82,7 +82,7 @@ func (uc *UserController) getUserGroupsHandler(c *gin.Context) {
 		return
 	}

-	var groupsDto []dto.UserGroupDtoWithUsers
+	var groupsDto []dto.UserGroupDto
 	if err := dto.MapStructList(groups, &groupsDto); err != nil {
 		_ = c.Error(err)
 		return
@@ -391,12 +391,13 @@ func (uc *UserController) RequestOneTimeAccessEmailAsUnauthenticatedUserHandler(
 		return
 	}

-	err := uc.userService.RequestOneTimeAccessEmailAsUnauthenticatedUser(c.Request.Context(), input.Email, input.RedirectPath)
+	deviceToken, err := uc.userService.RequestOneTimeAccessEmailAsUnauthenticatedUser(c.Request.Context(), input.Email, input.RedirectPath)
 	if err != nil {
 		_ = c.Error(err)
 		return
 	}

+	cookie.AddDeviceTokenCookie(c, deviceToken)
 	c.Status(http.StatusNoContent)
 }

@@ -440,7 +441,8 @@ func (uc *UserController) RequestOneTimeAccessEmailAsAdminHandler(c *gin.Context
 // @Success 200 {object} dto.UserDto
 // @Router /api/one-time-access-token/{token} [post]
 func (uc *UserController) exchangeOneTimeAccessTokenHandler(c *gin.Context) {
-	user, token, err := uc.userService.ExchangeOneTimeAccessToken(c.Request.Context(), c.Param("token"), c.ClientIP(), c.Request.UserAgent())
+	deviceToken, _ := c.Cookie(cookie.DeviceTokenCookieName)
+	user, token, err := uc.userService.ExchangeOneTimeAccessToken(c.Request.Context(), c.Param("token"), deviceToken, c.ClientIP(), c.Request.UserAgent())
 	if err != nil {
 		_ = c.Error(err)
 		return
@@ -543,7 +545,7 @@ func (uc *UserController) createSignupTokenHandler(c *gin.Context) {
 		ttl = defaultSignupTokenDuration
 	}

-	signupToken, err := uc.userService.CreateSignupToken(c.Request.Context(), ttl, input.UsageLimit)
+	signupToken, err := uc.userService.CreateSignupToken(c.Request.Context(), ttl, input.UsageLimit, input.UserGroupIDs)
 	if err != nil {
 		_ = c.Error(err)
 		return
--- a/backend/internal/controller/user_group_controller.go
+++ b/backend/internal/controller/user_group_controller.go
@@ -28,6 +28,7 @@ func NewUserGroupController(group *gin.RouterGroup, authMiddleware *middleware.A
 		userGroupsGroup.PUT("/:id", ugc.update)
 		userGroupsGroup.DELETE("/:id", ugc.delete)
 		userGroupsGroup.PUT("/:id/users", ugc.updateUsers)
+		userGroupsGroup.PUT("/:id/allowed-oidc-clients", ugc.updateAllowedOidcClients)
 	}
 }

@@ -44,7 +45,7 @@ type UserGroupController struct {
 // @Param pagination[limit] query int false "Number of items per page" default(20)
 // @Param sort[column] query string false "Column to sort by"
 // @Param sort[direction] query string false "Sort direction (asc or desc)" default("asc")
-// @Success 200 {object} dto.Paginated[dto.UserGroupDtoWithUserCount]
+// @Success 200 {object} dto.Paginated[dto.UserGroupMinimalDto]
 // @Router /api/user-groups [get]
 func (ugc *UserGroupController) list(c *gin.Context) {
 	searchTerm := c.Query("search")
@@ -57,9 +58,9 @@ func (ugc *UserGroupController) list(c *gin.Context) {
 	}

 	// Map the user groups to DTOs
-	var groupsDto = make([]dto.UserGroupDtoWithUserCount, len(groups))
+	var groupsDto = make([]dto.UserGroupMinimalDto, len(groups))
 	for i, group := range groups {
-		var groupDto dto.UserGroupDtoWithUserCount
+		var groupDto dto.UserGroupMinimalDto
 		if err := dto.MapStruct(group, &groupDto); err != nil {
 			_ = c.Error(err)
 			return
@@ -72,7 +73,7 @@ func (ugc *UserGroupController) list(c *gin.Context) {
 		groupsDto[i] = groupDto
 	}

-	c.JSON(http.StatusOK, dto.Paginated[dto.UserGroupDtoWithUserCount]{
+	c.JSON(http.StatusOK, dto.Paginated[dto.UserGroupMinimalDto]{
 		Data:       groupsDto,
 		Pagination: pagination,
 	})
@@ -85,7 +86,7 @@ func (ugc *UserGroupController) list(c *gin.Context) {
 // @Accept json
 // @Produce json
 // @Param id path string true "User Group ID"
-// @Success 200 {object} dto.UserGroupDtoWithUsers
+// @Success 200 {object} dto.UserGroupDto
 // @Router /api/user-groups/{id} [get]
 func (ugc *UserGroupController) get(c *gin.Context) {
 	group, err := ugc.UserGroupService.Get(c.Request.Context(), c.Param("id"))
@@ -94,7 +95,7 @@ func (ugc *UserGroupController) get(c *gin.Context) {
 		return
 	}

-	var groupDto dto.UserGroupDtoWithUsers
+	var groupDto dto.UserGroupDto
 	if err := dto.MapStruct(group, &groupDto); err != nil {
 		_ = c.Error(err)
 		return
@@ -110,7 +111,7 @@ func (ugc *UserGroupController) get(c *gin.Context) {
 // @Accept json
 // @Produce json
 // @Param userGroup body dto.UserGroupCreateDto true "User group information"
-// @Success 201 {object} dto.UserGroupDtoWithUsers "Created user group"
+// @Success 201 {object} dto.UserGroupDto "Created user group"
 // @Router /api/user-groups [post]
 func (ugc *UserGroupController) create(c *gin.Context) {
 	var input dto.UserGroupCreateDto
@@ -125,7 +126,7 @@ func (ugc *UserGroupController) create(c *gin.Context) {
 		return
 	}

-	var groupDto dto.UserGroupDtoWithUsers
+	var groupDto dto.UserGroupDto
 	if err := dto.MapStruct(group, &groupDto); err != nil {
 		_ = c.Error(err)
 		return
@@ -142,7 +143,7 @@ func (ugc *UserGroupController) create(c *gin.Context) {
 // @Produce json
 // @Param id path string true "User Group ID"
 // @Param userGroup body dto.UserGroupCreateDto true "User group information"
-// @Success 200 {object} dto.UserGroupDtoWithUsers "Updated user group"
+// @Success 200 {object} dto.UserGroupDto "Updated user group"
 // @Router /api/user-groups/{id} [put]
 func (ugc *UserGroupController) update(c *gin.Context) {
 	var input dto.UserGroupCreateDto
@@ -157,7 +158,7 @@ func (ugc *UserGroupController) update(c *gin.Context) {
 		return
 	}

-	var groupDto dto.UserGroupDtoWithUsers
+	var groupDto dto.UserGroupDto
 	if err := dto.MapStruct(group, &groupDto); err != nil {
 		_ = c.Error(err)
 		return
@@ -192,7 +193,7 @@ func (ugc *UserGroupController) delete(c *gin.Context) {
 // @Produce json
 // @Param id path string true "User Group ID"
 // @Param users body dto.UserGroupUpdateUsersDto true "List of user IDs to assign to this group"
-// @Success 200 {object} dto.UserGroupDtoWithUsers
+// @Success 200 {object} dto.UserGroupDto
 // @Router /api/user-groups/{id}/users [put]
 func (ugc *UserGroupController) updateUsers(c *gin.Context) {
 	var input dto.UserGroupUpdateUsersDto
@@ -207,7 +208,7 @@ func (ugc *UserGroupController) updateUsers(c *gin.Context) {
 		return
 	}

-	var groupDto dto.UserGroupDtoWithUsers
+	var groupDto dto.UserGroupDto
 	if err := dto.MapStruct(group, &groupDto); err != nil {
 		_ = c.Error(err)
 		return
@@ -215,3 +216,35 @@ func (ugc *UserGroupController) updateUsers(c *gin.Context) {

 	c.JSON(http.StatusOK, groupDto)
 }
+
+// updateAllowedOidcClients godoc
+// @Summary Update allowed OIDC clients
+// @Description Update the OIDC clients allowed for a specific user group
+// @Tags OIDC
+// @Accept json
+// @Produce json
+// @Param id path string true "User Group ID"
+// @Param groups body dto.UserGroupUpdateAllowedOidcClientsDto true "OIDC client IDs to allow"
+// @Success 200 {object} dto.UserGroupDto "Updated user group"
+// @Router /api/user-groups/{id}/allowed-oidc-clients [put]
+func (ugc *UserGroupController) updateAllowedOidcClients(c *gin.Context) {
+	var input dto.UserGroupUpdateAllowedOidcClientsDto
+	if err := c.ShouldBindJSON(&input); err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	userGroup, err := ugc.UserGroupService.UpdateAllowedOidcClient(c.Request.Context(), c.Param("id"), input)
+	if err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	var userGroupDto dto.UserGroupDto
+	if err := dto.MapStruct(userGroup, &userGroupDto); err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	c.JSON(http.StatusOK, userGroupDto)
+}
--- a/backend/internal/controller/webauthn_controller.go
+++ b/backend/internal/controller/webauthn_controller.go
@@ -57,7 +57,7 @@ func (wc *WebauthnController) verifyRegistrationHandler(c *gin.Context) {
 	}

 	userID := c.GetString("userID")
-	credential, err := wc.webAuthnService.VerifyRegistration(c.Request.Context(), sessionID, userID, c.Request)
+	credential, err := wc.webAuthnService.VerifyRegistration(c.Request.Context(), sessionID, userID, c.Request, c.ClientIP())
 	if err != nil {
 		_ = c.Error(err)
 		return
@@ -134,8 +134,10 @@ func (wc *WebauthnController) listCredentialsHandler(c *gin.Context) {
 func (wc *WebauthnController) deleteCredentialHandler(c *gin.Context) {
 	userID := c.GetString("userID")
 	credentialID := c.Param("id")
+	clientIP := c.ClientIP()
+	userAgent := c.Request.UserAgent()

-	err := wc.webAuthnService.DeleteCredential(c.Request.Context(), userID, credentialID)
+	err := wc.webAuthnService.DeleteCredential(c.Request.Context(), userID, credentialID, clientIP, userAgent)
 	if err != nil {
 		_ = c.Error(err)
 		return
--- a/backend/internal/dto/app_config_dto.go
+++ b/backend/internal/dto/app_config_dto.go
@@ -47,7 +47,7 @@ type AppConfigUpdateDto struct {
 	LdapAttributeGroupMember                   string `json:"ldapAttributeGroupMember"`
 	LdapAttributeGroupUniqueIdentifier         string `json:"ldapAttributeGroupUniqueIdentifier"`
 	LdapAttributeGroupName                     string `json:"ldapAttributeGroupName"`
-	LdapAttributeAdminGroup                    string `json:"ldapAttributeAdminGroup"`
+	LdapAdminGroupName                         string `json:"ldapAdminGroupName"`
 	LdapSoftDeleteUsers                        string `json:"ldapSoftDeleteUsers"`
 	EmailOneTimeAccessAsAdminEnabled           string `json:"emailOneTimeAccessAsAdminEnabled" binding:"required"`
 	EmailOneTimeAccessAsUnauthenticatedEnabled string `json:"emailOneTimeAccessAsUnauthenticatedEnabled" binding:"required"`
--- a/backend/internal/dto/oidc_dto.go
+++ b/backend/internal/dto/oidc_dto.go
@@ -18,11 +18,12 @@ type OidcClientDto struct {
 	IsPublic           bool                     `json:"isPublic"`
 	PkceEnabled        bool                     `json:"pkceEnabled"`
 	Credentials        OidcClientCredentialsDto `json:"credentials"`
+	IsGroupRestricted  bool                     `json:"isGroupRestricted"`
 }

 type OidcClientWithAllowedUserGroupsDto struct {
 	OidcClientDto
-	AllowedUserGroups []UserGroupDtoWithUserCount `json:"allowedUserGroups"`
+	AllowedUserGroups []UserGroupMinimalDto `json:"allowedUserGroups"`
 }

 type OidcClientWithAllowedGroupsCountDto struct {
@@ -43,6 +44,7 @@ type OidcClientUpdateDto struct {
 	HasDarkLogo              bool                     `json:"hasDarkLogo"`
 	LogoURL                  *string                  `json:"logoUrl"`
 	DarkLogoURL              *string                  `json:"darkLogoUrl"`
+	IsGroupRestricted        bool                     `json:"isGroupRestricted"`
 }

 type OidcClientCreateDto struct {
--- a/backend/internal/dto/scim_dto.go
+++ b/backend/internal/dto/scim_dto.go
@@ -0,0 +1,96 @@
+package dto
+
+import (
+	"time"
+
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+)
+
+type ScimServiceProviderDTO struct {
+	ID           string                `json:"id"`
+	Endpoint     string                `json:"endpoint"`
+	Token        string                `json:"token"`
+	LastSyncedAt *datatype.DateTime    `json:"lastSyncedAt"`
+	OidcClient   OidcClientMetaDataDto `json:"oidcClient"`
+	CreatedAt    datatype.DateTime     `json:"createdAt"`
+}
+
+type ScimServiceProviderCreateDTO struct {
+	Endpoint     string `json:"endpoint" binding:"required,url"`
+	Token        string `json:"token"`
+	OidcClientID string `json:"oidcClientId" binding:"required"`
+}
+
+type ScimUser struct {
+	ScimResourceData
+	UserName string      `json:"userName"`
+	Name     *ScimName   `json:"name,omitempty"`
+	Display  string      `json:"displayName,omitempty"`
+	Active   bool        `json:"active"`
+	Emails   []ScimEmail `json:"emails,omitempty"`
+}
+
+type ScimName struct {
+	GivenName  string `json:"givenName,omitempty"`
+	FamilyName string `json:"familyName,omitempty"`
+}
+
+type ScimEmail struct {
+	Value   string `json:"value"`
+	Primary bool   `json:"primary,omitempty"`
+}
+
+type ScimGroup struct {
+	ScimResourceData
+	Display string            `json:"displayName"`
+	Members []ScimGroupMember `json:"members,omitempty"`
+}
+
+type ScimGroupMember struct {
+	Value string `json:"value"`
+}
+
+type ScimListResponse[T any] struct {
+	Resources    []T `json:"Resources"`
+	TotalResults int `json:"totalResults"`
+	StartIndex   int `json:"startIndex"`
+	ItemsPerPage int `json:"itemsPerPage"`
+}
+
+type ScimResourceData struct {
+	ID         string           `json:"id,omitempty"`
+	ExternalID string           `json:"externalId,omitempty"`
+	Schemas    []string         `json:"schemas"`
+	Meta       ScimResourceMeta `json:"meta,omitempty"`
+}
+
+type ScimResourceMeta struct {
+	Location     string    `json:"location,omitempty"`
+	ResourceType string    `json:"resourceType,omitempty"`
+	Created      time.Time `json:"created,omitempty"`
+	LastModified time.Time `json:"lastModified,omitempty"`
+	Version      string    `json:"version,omitempty"`
+}
+
+func (r ScimResourceData) GetID() string {
+	return r.ID
+}
+
+func (r ScimResourceData) GetExternalID() string {
+	return r.ExternalID
+}
+
+func (r ScimResourceData) GetSchemas() []string {
+	return r.Schemas
+}
+
+func (r ScimResourceData) GetMeta() ScimResourceMeta {
+	return r.Meta
+}
+
+type ScimResource interface {
+	GetID() string
+	GetExternalID() string
+	GetSchemas() []string
+	GetMeta() ScimResourceMeta
+}
--- a/backend/internal/dto/signup_token_dto.go
+++ b/backend/internal/dto/signup_token_dto.go
@@ -6,15 +6,17 @@ import (
 )

 type SignupTokenCreateDto struct {
-	TTL        utils.JSONDuration `json:"ttl" binding:"required,ttl"`
-	UsageLimit int                `json:"usageLimit" binding:"required,min=1,max=100"`
+	TTL          utils.JSONDuration `json:"ttl" binding:"required,ttl"`
+	UsageLimit   int                `json:"usageLimit" binding:"required,min=1,max=100"`
+	UserGroupIDs []string           `json:"userGroupIds"`
 }

 type SignupTokenDto struct {
-	ID         string            `json:"id"`
-	Token      string            `json:"token"`
-	ExpiresAt  datatype.DateTime `json:"expiresAt"`
-	UsageLimit int               `json:"usageLimit"`
-	UsageCount int               `json:"usageCount"`
-	CreatedAt  datatype.DateTime `json:"createdAt"`
+	ID         string                `json:"id"`
+	Token      string                `json:"token"`
+	ExpiresAt  datatype.DateTime     `json:"expiresAt"`
+	UsageLimit int                   `json:"usageLimit"`
+	UsageCount int                   `json:"usageCount"`
+	UserGroups []UserGroupMinimalDto `json:"userGroups"`
+	CreatedAt  datatype.DateTime     `json:"createdAt"`
 }
--- a/backend/internal/dto/user_dto.go
+++ b/backend/internal/dto/user_dto.go
@@ -8,30 +8,31 @@ import (
 )

 type UserDto struct {
-	ID           string           `json:"id"`
-	Username     string           `json:"username"`
-	Email        *string          `json:"email" `
-	FirstName    string           `json:"firstName"`
-	LastName     *string          `json:"lastName"`
-	DisplayName  string           `json:"displayName"`
-	IsAdmin      bool             `json:"isAdmin"`
-	Locale       *string          `json:"locale"`
-	CustomClaims []CustomClaimDto `json:"customClaims"`
-	UserGroups   []UserGroupDto   `json:"userGroups"`
-	LdapID       *string          `json:"ldapId"`
-	Disabled     bool             `json:"disabled"`
+	ID           string                `json:"id"`
+	Username     string                `json:"username"`
+	Email        *string               `json:"email" `
+	FirstName    string                `json:"firstName"`
+	LastName     *string               `json:"lastName"`
+	DisplayName  string                `json:"displayName"`
+	IsAdmin      bool                  `json:"isAdmin"`
+	Locale       *string               `json:"locale"`
+	CustomClaims []CustomClaimDto      `json:"customClaims"`
+	UserGroups   []UserGroupMinimalDto `json:"userGroups"`
+	LdapID       *string               `json:"ldapId"`
+	Disabled     bool                  `json:"disabled"`
 }

 type UserCreateDto struct {
-	Username    string  `json:"username" binding:"required,username,min=2,max=50" unorm:"nfc"`
-	Email       *string `json:"email" binding:"omitempty,email" unorm:"nfc"`
-	FirstName   string  `json:"firstName" binding:"required,min=1,max=50" unorm:"nfc"`
-	LastName    string  `json:"lastName" binding:"max=50" unorm:"nfc"`
-	DisplayName string  `json:"displayName" binding:"required,min=1,max=100" unorm:"nfc"`
-	IsAdmin     bool    `json:"isAdmin"`
-	Locale      *string `json:"locale"`
-	Disabled    bool    `json:"disabled"`
-	LdapID      string  `json:"-"`
+	Username     string   `json:"username" binding:"required,username,min=2,max=50" unorm:"nfc"`
+	Email        *string  `json:"email" binding:"omitempty,email" unorm:"nfc"`
+	FirstName    string   `json:"firstName" binding:"required,min=1,max=50" unorm:"nfc"`
+	LastName     string   `json:"lastName" binding:"max=50" unorm:"nfc"`
+	DisplayName  string   `json:"displayName" binding:"required,min=1,max=100" unorm:"nfc"`
+	IsAdmin      bool     `json:"isAdmin"`
+	Locale       *string  `json:"locale"`
+	Disabled     bool     `json:"disabled"`
+	UserGroupIds []string `json:"userGroupIds"`
+	LdapID       string   `json:"-"`
 }

 func (u UserCreateDto) Validate() error {
--- a/backend/internal/dto/user_group_dto.go
+++ b/backend/internal/dto/user_group_dto.go
@@ -8,25 +8,17 @@ import (
 )

 type UserGroupDto struct {
-	ID           string            `json:"id"`
-	FriendlyName string            `json:"friendlyName"`
-	Name         string            `json:"name"`
-	CustomClaims []CustomClaimDto  `json:"customClaims"`
-	LdapID       *string           `json:"ldapId"`
-	CreatedAt    datatype.DateTime `json:"createdAt"`
+	ID                 string                  `json:"id"`
+	FriendlyName       string                  `json:"friendlyName"`
+	Name               string                  `json:"name"`
+	CustomClaims       []CustomClaimDto        `json:"customClaims"`
+	LdapID             *string                 `json:"ldapId"`
+	CreatedAt          datatype.DateTime       `json:"createdAt"`
+	Users              []UserDto               `json:"users"`
+	AllowedOidcClients []OidcClientMetaDataDto `json:"allowedOidcClients"`
 }

-type UserGroupDtoWithUsers struct {
-	ID           string            `json:"id"`
-	FriendlyName string            `json:"friendlyName"`
-	Name         string            `json:"name"`
-	CustomClaims []CustomClaimDto  `json:"customClaims"`
-	Users        []UserDto         `json:"users"`
-	LdapID       *string           `json:"ldapId"`
-	CreatedAt    datatype.DateTime `json:"createdAt"`
-}
-
-type UserGroupDtoWithUserCount struct {
+type UserGroupMinimalDto struct {
 	ID           string            `json:"id"`
 	FriendlyName string            `json:"friendlyName"`
 	Name         string            `json:"name"`
@@ -36,6 +28,10 @@ type UserGroupDtoWithUserCount struct {
 	CreatedAt    datatype.DateTime `json:"createdAt"`
 }

+type UserGroupUpdateAllowedOidcClientsDto struct {
+	OidcClientIDs []string `json:"oidcClientIds" binding:"required"`
+}
+
 type UserGroupCreateDto struct {
 	FriendlyName string `json:"friendlyName" binding:"required,min=2,max=50" unorm:"nfc"`
 	Name         string `json:"name" binding:"required,min=2,max=255" unorm:"nfc"`
--- a/backend/internal/job/analytics_job.go
+++ b/backend/internal/job/analytics_job.go
@@ -19,7 +19,7 @@ const heartbeatUrl = "https://analytics.pocket-id.org/heartbeat"

 func (s *Scheduler) RegisterAnalyticsJob(ctx context.Context, appConfig *service.AppConfigService, httpClient *http.Client) error {
 	// Skip if analytics are disabled or not in production environment
-	if common.EnvConfig.AnalyticsDisabled || common.EnvConfig.AppEnv != "production" {
+	if common.EnvConfig.AnalyticsDisabled || !common.EnvConfig.AppEnv.IsProduction() {
 		return nil
 	}

@@ -39,7 +39,7 @@ type AnalyticsJob struct {
 // sendHeartbeat sends a heartbeat to the analytics service
 func (j *AnalyticsJob) sendHeartbeat(parentCtx context.Context) error {
 	// Skip if analytics are disabled or not in production environment
-	if common.EnvConfig.AnalyticsDisabled || common.EnvConfig.AppEnv != "production" {
+	if common.EnvConfig.AnalyticsDisabled || !common.EnvConfig.AppEnv.IsProduction() {
 		return nil
 	}

--- a/backend/internal/job/db_cleanup_job.go
+++ b/backend/internal/job/db_cleanup_job.go
@@ -10,6 +10,7 @@ import (
 	"github.com/go-co-op/gocron/v2"
 	"gorm.io/gorm"

+	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/model"
 	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
 )
@@ -119,11 +120,13 @@ func (j *DbCleanupJobs) clearReauthenticationTokens(ctx context.Context) error {
 	return nil
 }

-// ClearAuditLogs deletes audit logs older than 90 days
+// ClearAuditLogs deletes audit logs older than the configured retention window
 func (j *DbCleanupJobs) clearAuditLogs(ctx context.Context) error {
+	cutoff := time.Now().AddDate(0, 0, -common.EnvConfig.AuditLogRetentionDays)
+
 	st := j.db.
 		WithContext(ctx).
-		Delete(&model.AuditLog{}, "created_at < ?", datatype.DateTime(time.Now().AddDate(0, 0, -90)))
+		Delete(&model.AuditLog{}, "created_at < ?", datatype.DateTime(cutoff))
 	if st.Error != nil {
 		return fmt.Errorf("failed to delete old audit logs: %w", st.Error)
 	}
--- a/backend/internal/middleware/cache_control.go
+++ b/backend/internal/middleware/cache_control.go
@@ -0,0 +1,26 @@
+package middleware
+
+import "github.com/gin-gonic/gin"
+
+// CacheControlMiddleware sets a safe default Cache-Control header on responses
+// that do not already specify one. This prevents proxies from caching
+// authenticated responses that might contain private data.
+type CacheControlMiddleware struct {
+	headerValue string
+}
+
+func NewCacheControlMiddleware() *CacheControlMiddleware {
+	return &CacheControlMiddleware{
+		headerValue: "private, no-store",
+	}
+}
+
+func (m *CacheControlMiddleware) Add() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.Writer.Header().Get("Cache-Control") == "" {
+			c.Header("Cache-Control", m.headerValue)
+		}
+
+		c.Next()
+	}
+}
--- a/backend/internal/middleware/cache_control_test.go
+++ b/backend/internal/middleware/cache_control_test.go
@@ -0,0 +1,45 @@
+package middleware
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCacheControlMiddlewareSetsDefault(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.Use(NewCacheControlMiddleware().Add())
+
+	router.GET("/test", func(c *gin.Context) {
+		c.Status(http.StatusOK)
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/test", http.NoBody)
+	w := httptest.NewRecorder()
+
+	router.ServeHTTP(w, req)
+
+	require.Equal(t, "private, no-store", w.Header().Get("Cache-Control"))
+}
+
+func TestCacheControlMiddlewarePreservesExistingHeader(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.Use(NewCacheControlMiddleware().Add())
+
+	router.GET("/custom", func(c *gin.Context) {
+		c.Header("Cache-Control", "public, max-age=60")
+		c.Status(http.StatusOK)
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/custom", http.NoBody)
+	w := httptest.NewRecorder()
+
+	router.ServeHTTP(w, req)
+
+	require.Equal(t, "public, max-age=60", w.Header().Get("Cache-Control"))
+}
--- a/backend/internal/middleware/head_middleware.go
+++ b/backend/internal/middleware/head_middleware.go
@@ -0,0 +1,40 @@
+package middleware
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+)
+
+type IsHeadRequestCtxKey struct{}
+
+type headWriter struct {
+	gin.ResponseWriter
+	size int
+}
+
+func (w *headWriter) Write(b []byte) (int, error) {
+	w.size += len(b)
+	return w.size, nil
+}
+
+func HeadMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		// Only process if it's a HEAD request
+		if c.Request.Context().Value(IsHeadRequestCtxKey{}) != true {
+			c.Next()
+			return
+		}
+
+		// Replace the ResponseWriter with our headWriter to swallow the body
+		hw := &headWriter{ResponseWriter: c.Writer}
+		c.Writer = hw
+
+		c.Next()
+
+		c.Writer.Header().Set("Content-Length", strconv.Itoa(hw.size))
+		c.Request.Method = http.MethodHead
+
+	}
+}
--- a/backend/internal/middleware/rate_limit.go
+++ b/backend/internal/middleware/rate_limit.go
@@ -29,7 +29,7 @@ func (m *RateLimitMiddleware) Add(limit rate.Limit, burst int) gin.HandlerFunc {

 		// Skip rate limiting for localhost and test environment
 		// If the client ip is localhost the request comes from the frontend
-		if ip == "" || ip == "127.0.0.1" || ip == "::1" || common.EnvConfig.AppEnv == "test" {
+		if ip == "" || ip == "127.0.0.1" || ip == "::1" || common.EnvConfig.AppEnv.IsTest() {
 			c.Next()
 			return
 		}
--- a/backend/internal/model/app_config.go
+++ b/backend/internal/model/app_config.go
@@ -77,7 +77,7 @@ type AppConfig struct {
 	LdapAttributeGroupMember           AppConfigVariable `key:"ldapAttributeGroupMember"`
 	LdapAttributeGroupUniqueIdentifier AppConfigVariable `key:"ldapAttributeGroupUniqueIdentifier"`
 	LdapAttributeGroupName             AppConfigVariable `key:"ldapAttributeGroupName"`
-	LdapAttributeAdminGroup            AppConfigVariable `key:"ldapAttributeAdminGroup"`
+	LdapAdminGroupName                 AppConfigVariable `key:"ldapAdminGroupName"`
 	LdapSoftDeleteUsers                AppConfigVariable `key:"ldapSoftDeleteUsers"`
 }

--- a/backend/internal/model/audit_log.go
+++ b/backend/internal/model/audit_log.go
@@ -34,6 +34,8 @@ const (
 	AuditLogEventNewClientAuthorization     AuditLogEvent = "NEW_CLIENT_AUTHORIZATION"
 	AuditLogEventDeviceCodeAuthorization    AuditLogEvent = "DEVICE_CODE_AUTHORIZATION"
 	AuditLogEventNewDeviceCodeAuthorization AuditLogEvent = "NEW_DEVICE_CODE_AUTHORIZATION"
+	AuditLogEventPasskeyAdded               AuditLogEvent = "PASSKEY_ADDED"
+	AuditLogEventPasskeyRemoved             AuditLogEvent = "PASSKEY_REMOVED"
 )

 // Scan and Value methods for GORM to handle the custom type
--- a/backend/internal/model/oidc.go
+++ b/backend/internal/model/oidc.go
@@ -58,6 +58,7 @@ type OidcClient struct {
 	RequiresReauthentication bool `sortable:"true" filterable:"true"`
 	Credentials              OidcClientCredentials
 	LaunchURL                *string
+	IsGroupRestricted        bool `sortable:"true" filterable:"true"`

 	AllowedUserGroups         []UserGroup `gorm:"many2many:oidc_clients_allowed_user_groups;"`
 	CreatedByID               *string
--- a/backend/internal/model/scim.go
+++ b/backend/internal/model/scim.go
@@ -0,0 +1,14 @@
+package model
+
+import datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+
+type ScimServiceProvider struct {
+	Base
+
+	Endpoint     string `sortable:"true"`
+	Token        datatype.EncryptedString
+	LastSyncedAt *datatype.DateTime `sortable:"true"`
+
+	OidcClientID string
+	OidcClient   OidcClient `gorm:"foreignKey:OidcClientID;references:ID;"`
+}
--- a/backend/internal/model/signup_token.go
+++ b/backend/internal/model/signup_token.go
@@ -13,6 +13,7 @@ type SignupToken struct {
 	ExpiresAt  datatype.DateTime `json:"expiresAt" sortable:"true"`
 	UsageLimit int               `json:"usageLimit" sortable:"true"`
 	UsageCount int               `json:"usageCount" sortable:"true"`
+	UserGroups []UserGroup       `gorm:"many2many:signup_tokens_user_groups;"`
 }

 func (st *SignupToken) IsExpired() bool {
--- a/backend/internal/model/storage.go
+++ b/backend/internal/model/storage.go
@@ -0,0 +1,17 @@
+package model
+
+import (
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+)
+
+type Storage struct {
+	Path      string `gorm:"primaryKey"`
+	Data      []byte
+	Size      int64
+	ModTime   datatype.DateTime
+	CreatedAt datatype.DateTime
+}
+
+func (Storage) TableName() string {
+	return "storage"
+}
--- a/backend/internal/model/types/date_time.go
+++ b/backend/internal/model/types/date_time.go
@@ -11,6 +11,15 @@ import (
 // DateTime custom type for time.Time to store date as unix timestamp for sqlite and as date for postgres
 type DateTime time.Time //nolint:recvcheck

+func DateTimeFromString(str string) (DateTime, error) {
+	t, err := time.Parse(time.RFC3339Nano, str)
+	if err != nil {
+		return DateTime{}, fmt.Errorf("failed to parse date string: %w", err)
+	}
+
+	return DateTime(t), nil
+}
+
 func (date *DateTime) Scan(value any) (err error) {
 	switch v := value.(type) {
 	case time.Time:
--- a/backend/internal/model/types/encrypted_string.go
+++ b/backend/internal/model/types/encrypted_string.go
@@ -0,0 +1,91 @@
+package datatype
+
+import (
+	"crypto/sha256"
+	"database/sql/driver"
+	"encoding/base64"
+	"fmt"
+	"io"
+
+	"github.com/pocket-id/pocket-id/backend/internal/common"
+	cryptoutils "github.com/pocket-id/pocket-id/backend/internal/utils/crypto"
+	"golang.org/x/crypto/hkdf"
+)
+
+const encryptedStringAAD = "encrypted_string"
+
+var encStringKey []byte
+
+// EncryptedString stores plaintext in memory and persists encrypted data in the database.
+type EncryptedString string //nolint:recvcheck
+
+func (e *EncryptedString) Scan(value any) error {
+	if value == nil {
+		*e = ""
+		return nil
+	}
+
+	var raw string
+	switch v := value.(type) {
+	case string:
+		raw = v
+	case []byte:
+		raw = string(v)
+	default:
+		return fmt.Errorf("unexpected type for EncryptedString: %T", value)
+	}
+
+	if raw == "" {
+		*e = ""
+		return nil
+	}
+
+	encBytes, err := base64.StdEncoding.DecodeString(raw)
+	if err != nil {
+		return fmt.Errorf("failed to decode encrypted string: %w", err)
+	}
+
+	decBytes, err := cryptoutils.Decrypt(encStringKey, encBytes, []byte(encryptedStringAAD))
+	if err != nil {
+		return fmt.Errorf("failed to decrypt encrypted string: %w", err)
+	}
+
+	*e = EncryptedString(decBytes)
+	return nil
+}
+
+func (e EncryptedString) Value() (driver.Value, error) {
+	if e == "" {
+		return "", nil
+	}
+
+	encBytes, err := cryptoutils.Encrypt(encStringKey, []byte(e), []byte(encryptedStringAAD))
+	if err != nil {
+		return nil, fmt.Errorf("failed to encrypt string: %w", err)
+	}
+
+	return base64.StdEncoding.EncodeToString(encBytes), nil
+}
+
+func (e EncryptedString) String() string {
+	return string(e)
+}
+
+func deriveEncryptedStringKey(master []byte) ([]byte, error) {
+	const info = "pocketid/encrypted_string"
+	r := hkdf.New(sha256.New, master, nil, []byte(info))
+
+	key := make([]byte, 32)
+	if _, err := io.ReadFull(r, key); err != nil {
+		return nil, err
+	}
+	return key, nil
+}
+
+func init() {
+	key, err := deriveEncryptedStringKey(common.EnvConfig.EncryptionKey)
+	if err != nil {
+		panic(fmt.Sprintf("failed to derive encrypted string key: %v", err))
+	}
+	encStringKey = key
+}
--- a/backend/internal/model/user.go
+++ b/backend/internal/model/user.go
@@ -2,6 +2,7 @@ package model

 import (
 	"strings"
+	"time"

 	"github.com/go-webauthn/webauthn/protocol"
 	"github.com/go-webauthn/webauthn/webauthn"
@@ -22,6 +23,7 @@ type User struct {
 	Locale      *string
 	LdapID      *string
 	Disabled    bool `sortable:"true" filterable:"true"`
+	UpdatedAt   *datatype.DateTime

 	CustomClaims []CustomClaim
 	UserGroups   []UserGroup `gorm:"many2many:user_groups_users;"`
@@ -85,10 +87,18 @@ func (u User) Initials() string {
 	return strings.ToUpper(first + last)
 }

+func (u User) LastModified() time.Time {
+	if u.UpdatedAt != nil {
+		return u.UpdatedAt.ToTime()
+	}
+	return u.CreatedAt.ToTime()
+}
+
 type OneTimeAccessToken struct {
 	Base
-	Token     string
-	ExpiresAt datatype.DateTime
+	Token       string
+	DeviceToken *string
+	ExpiresAt   datatype.DateTime

 	UserID string
 	User   User
--- a/backend/internal/model/user_group.go
+++ b/backend/internal/model/user_group.go
@@ -1,10 +1,25 @@
 package model

+import (
+	"time"
+
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+)
+
 type UserGroup struct {
 	Base
-	FriendlyName string `sortable:"true"`
-	Name         string `sortable:"true"`
-	LdapID       *string
-	Users        []User `gorm:"many2many:user_groups_users;"`
-	CustomClaims []CustomClaim
+	FriendlyName       string `sortable:"true"`
+	Name               string `sortable:"true"`
+	LdapID             *string
+	UpdatedAt          *datatype.DateTime
+	Users              []User `gorm:"many2many:user_groups_users;"`
+	CustomClaims       []CustomClaim
+	AllowedOidcClients []OidcClient `gorm:"many2many:oidc_clients_allowed_user_groups;"`
+}
+
+func (ug UserGroup) LastModified() time.Time {
+	if ug.UpdatedAt != nil {
+		return ug.UpdatedAt.ToTime()
+	}
+	return ug.CreatedAt.ToTime()
 }
--- a/backend/internal/service/app_config_service.go
+++ b/backend/internal/service/app_config_service.go
@@ -102,7 +102,7 @@ func (s *AppConfigService) getDefaultDbConfig() *model.AppConfig {
 		LdapAttributeGroupMember:           model.AppConfigVariable{Value: "member"},
 		LdapAttributeGroupUniqueIdentifier: model.AppConfigVariable{},
 		LdapAttributeGroupName:             model.AppConfigVariable{},
-		LdapAttributeAdminGroup:            model.AppConfigVariable{},
+		LdapAdminGroupName:                 model.AppConfigVariable{},
 		LdapSoftDeleteUsers:                model.AppConfigVariable{Value: "true"},
 	}
 }
--- a/backend/internal/service/app_lock_service.go
+++ b/backend/internal/service/app_lock_service.go
@@ -0,0 +1,296 @@
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"os"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/pocket-id/pocket-id/backend/internal/model"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+var (
+	ErrLockUnavailable = errors.New("lock is already held by another process")
+	ErrLockLost        = errors.New("lock ownership lost")
+)
+
+const (
+	ttl           = 30 * time.Second
+	renewInterval = 20 * time.Second
+	renewRetries  = 3
+	lockKey       = "application_lock"
+)
+
+type AppLockService struct {
+	db        *gorm.DB
+	lockID    string
+	processID int64
+	hostID    string
+}
+
+func NewAppLockService(db *gorm.DB) *AppLockService {
+	host, err := os.Hostname()
+	if err != nil || host == "" {
+		host = "unknown-host"
+	}
+
+	return &AppLockService{
+		db:        db,
+		processID: int64(os.Getpid()),
+		hostID:    host,
+		lockID:    uuid.NewString(),
+	}
+}
+
+type lockValue struct {
+	ProcessID int64  `json:"process_id"`
+	HostID    string `json:"host_id"`
+	LockID    string `json:"lock_id"`
+	ExpiresAt int64  `json:"expires_at"`
+}
+
+func (lv *lockValue) Marshal() (string, error) {
+	data, err := json.Marshal(lv)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+func (lv *lockValue) Unmarshal(raw string) error {
+	if raw == "" {
+		return nil
+	}
+	return json.Unmarshal([]byte(raw), lv)
+}
+
+// Acquire obtains the lock. When force is true, the lock is stolen from any existing owner.
+// If the lock is forcefully acquired, it blocks until the previous lock has expired.
+func (s *AppLockService) Acquire(ctx context.Context, force bool) (waitUntil time.Time, err error) {
+	tx := s.db.Begin()
+	defer func() {
+		tx.Rollback()
+	}()
+
+	var prevLockRaw string
+	err = tx.
+		WithContext(ctx).
+		Model(&model.KV{}).
+		Where("key = ?", lockKey).
+		Clauses(clause.Locking{Strength: "UPDATE"}).
+		Select("value").
+		Scan(&prevLockRaw).
+		Error
+	if err != nil {
+		return time.Time{}, fmt.Errorf("query existing lock: %w", err)
+	}
+
+	var prevLock lockValue
+	if prevLockRaw != "" {
+		if err := prevLock.Unmarshal(prevLockRaw); err != nil {
+			return time.Time{}, fmt.Errorf("decode existing lock value: %w", err)
+		}
+	}
+
+	now := time.Now()
+	nowUnix := now.Unix()
+
+	value := lockValue{
+		ProcessID: s.processID,
+		HostID:    s.hostID,
+		LockID:    s.lockID,
+		ExpiresAt: now.Add(ttl).Unix(),
+	}
+	raw, err := value.Marshal()
+	if err != nil {
+		return time.Time{}, fmt.Errorf("encode lock value: %w", err)
+	}
+
+	var query string
+	switch s.db.Name() {
+	case "sqlite":
+		query = `
+			INSERT INTO kv (key, value)
+			VALUES (?, ?)
+			ON CONFLICT(key) DO UPDATE SET 
+				value = excluded.value
+			WHERE (json_extract(kv.value, '$.expires_at') < ?) OR ?
+		`
+	case "postgres":
+		query = `
+			INSERT INTO kv (key, value)
+			VALUES ($1, $2)
+			ON CONFLICT(key) DO UPDATE SET 
+				value = excluded.value
+			WHERE ((kv.value::json->>'expires_at')::bigint < $3) OR ($4::boolean IS TRUE)
+		`
+	default:
+		return time.Time{}, fmt.Errorf("unsupported database dialect: %s", s.db.Name())
+	}
+
+	res := tx.WithContext(ctx).Exec(query, lockKey, raw, nowUnix, force)
+	if res.Error != nil {
+		return time.Time{}, fmt.Errorf("lock acquisition failed: %w", res.Error)
+	}
+
+	if err := tx.Commit().Error; err != nil {
+		return time.Time{}, fmt.Errorf("commit lock acquisition: %w", err)
+	}
+
+	// If there is a lock that is not expired and force is false, no rows will be affected
+	if res.RowsAffected == 0 {
+		return time.Time{}, ErrLockUnavailable
+	}
+
+	if force && prevLock.ExpiresAt > nowUnix && prevLock.LockID != s.lockID {
+		waitUntil = time.Unix(prevLock.ExpiresAt, 0)
+	}
+
+	attrs := []any{
+		slog.Int64("process_id", s.processID),
+		slog.String("host_id", s.hostID),
+	}
+	if wait := time.Until(waitUntil); wait > 0 {
+		attrs = append(attrs, slog.Duration("wait_before_proceeding", wait))
+	}
+	slog.Info("Acquired application lock", attrs...)
+
+	return waitUntil, nil
+}
+
+// RunRenewal keeps renewing the lock until the context is canceled.
+func (s *AppLockService) RunRenewal(ctx context.Context) error {
+	ticker := time.NewTicker(renewInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-ticker.C:
+			if err := s.renew(ctx); err != nil {
+				return fmt.Errorf("renew lock: %w", err)
+			}
+		}
+	}
+}
+
+// Release releases the lock if it is held by this process.
+func (s *AppLockService) Release(ctx context.Context) error {
+	opCtx, cancel := context.WithTimeout(ctx, 3*time.Second)
+	defer cancel()
+
+	var query string
+	switch s.db.Name() {
+	case "sqlite":
+		query = `
+		DELETE FROM kv
+		WHERE key = ?
+		  AND json_extract(value, '$.lock_id') = ?
+	`
+	case "postgres":
+		query = `
+		DELETE FROM kv
+		WHERE key = $1
+		  AND value::json->>'lock_id' = $2
+	`
+	default:
+		return fmt.Errorf("unsupported database dialect: %s", s.db.Name())
+	}
+
+	res := s.db.WithContext(opCtx).Exec(query, lockKey, s.lockID)
+	if res.Error != nil {
+		return fmt.Errorf("release lock failed: %w", res.Error)
+	}
+
+	if res.RowsAffected == 0 {
+		slog.Warn("Application lock not held by this process, cannot release",
+			slog.Int64("process_id", s.processID),
+			slog.String("host_id", s.hostID),
+		)
+	}
+
+	slog.Info("Released application lock",
+		slog.Int64("process_id", s.processID),
+		slog.String("host_id", s.hostID),
+	)
+	return nil
+}
+
+// renew tries to renew the lock, retrying up to renewRetries times (sleeping 1s between attempts).
+func (s *AppLockService) renew(ctx context.Context) error {
+	var lastErr error
+	for attempt := 1; attempt <= renewRetries; attempt++ {
+		now := time.Now()
+		nowUnix := now.Unix()
+		expiresAt := now.Add(ttl).Unix()
+
+		value := lockValue{
+			LockID:    s.lockID,
+			ProcessID: s.processID,
+			HostID:    s.hostID,
+			ExpiresAt: expiresAt,
+		}
+		raw, err := value.Marshal()
+		if err != nil {
+			return fmt.Errorf("encode lock value: %w", err)
+		}
+
+		var query string
+		switch s.db.Name() {
+		case "sqlite":
+			query = `
+				UPDATE kv
+				SET value = ?
+				WHERE key = ?
+				  AND json_extract(value, '$.lock_id') = ?
+				  AND json_extract(value, '$.expires_at') > ?
+			`
+		case "postgres":
+			query = `
+				UPDATE kv
+				SET value = $1
+				WHERE key = $2
+				  AND value::json->>'lock_id' = $3
+				  AND ((value::json->>'expires_at')::bigint > $4)
+			`
+		default:
+			return fmt.Errorf("unsupported database dialect: %s", s.db.Name())
+		}
+
+		opCtx, cancel := context.WithTimeout(ctx, 3*time.Second)
+		res := s.db.WithContext(opCtx).Exec(query, raw, lockKey, s.lockID, nowUnix)
+		cancel()
+
+		switch {
+		case res.Error != nil:
+			lastErr = fmt.Errorf("lock renewal failed: %w", res.Error)
+		case res.RowsAffected == 0:
+			// Must be after checking res.Error
+			return ErrLockLost
+		default:
+			slog.Debug("Renewed application lock",
+				slog.Int64("process_id", s.processID),
+				slog.String("host_id", s.hostID),
+			)
+			return nil
+		}
+
+		// Wait before next attempt or cancel if context is done
+		if attempt < renewRetries {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-time.After(1 * time.Second):
+			}
+		}
+	}
+
+	return lastErr
+}
--- a/backend/internal/service/app_lock_service_test.go
+++ b/backend/internal/service/app_lock_service_test.go
@@ -0,0 +1,189 @@
+package service
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+
+	"github.com/pocket-id/pocket-id/backend/internal/model"
+	testutils "github.com/pocket-id/pocket-id/backend/internal/utils/testing"
+)
+
+func newTestAppLockService(t *testing.T, db *gorm.DB) *AppLockService {
+	t.Helper()
+
+	return &AppLockService{
+		db:        db,
+		processID: 1,
+		hostID:    "test-host",
+		lockID:    "a13c7673-c7ae-49f1-9112-2cd2d0d4b0c1",
+	}
+}
+
+func insertLock(t *testing.T, db *gorm.DB, value lockValue) {
+	t.Helper()
+
+	raw, err := value.Marshal()
+	require.NoError(t, err)
+
+	err = db.Create(&model.KV{Key: lockKey, Value: &raw}).Error
+	require.NoError(t, err)
+}
+
+func readLockValue(t *testing.T, db *gorm.DB) lockValue {
+	t.Helper()
+
+	var row model.KV
+	err := db.Take(&row, "key = ?", lockKey).Error
+	require.NoError(t, err)
+
+	require.NotNil(t, row.Value)
+
+	var value lockValue
+	err = value.Unmarshal(*row.Value)
+	require.NoError(t, err)
+
+	return value
+}
+
+func TestAppLockServiceAcquire(t *testing.T) {
+	t.Run("creates new lock when none exists", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		_, err := service.Acquire(context.Background(), false)
+		require.NoError(t, err)
+
+		stored := readLockValue(t, db)
+		require.Equal(t, service.processID, stored.ProcessID)
+		require.Equal(t, service.hostID, stored.HostID)
+		require.Greater(t, stored.ExpiresAt, time.Now().Unix())
+	})
+
+	t.Run("returns ErrLockUnavailable when lock held by another process", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		existing := lockValue{
+			ProcessID: 99,
+			HostID:    "other-host",
+			ExpiresAt: time.Now().Add(ttl).Unix(),
+		}
+		insertLock(t, db, existing)
+
+		_, err := service.Acquire(context.Background(), false)
+		require.ErrorIs(t, err, ErrLockUnavailable)
+
+		current := readLockValue(t, db)
+		require.Equal(t, existing, current)
+	})
+
+	t.Run("force acquisition steals lock", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		insertLock(t, db, lockValue{
+			ProcessID: 99,
+			HostID:    "other-host",
+			ExpiresAt: time.Now().Unix(),
+		})
+
+		_, err := service.Acquire(context.Background(), true)
+		require.NoError(t, err)
+
+		stored := readLockValue(t, db)
+		require.Equal(t, service.processID, stored.ProcessID)
+		require.Equal(t, service.hostID, stored.HostID)
+		require.Greater(t, stored.ExpiresAt, time.Now().Unix())
+	})
+}
+
+func TestAppLockServiceRelease(t *testing.T) {
+	t.Run("removes owned lock", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		_, err := service.Acquire(context.Background(), false)
+		require.NoError(t, err)
+
+		err = service.Release(context.Background())
+		require.NoError(t, err)
+
+		var row model.KV
+		err = db.Take(&row, "key = ?", lockKey).Error
+		require.ErrorIs(t, err, gorm.ErrRecordNotFound)
+	})
+
+	t.Run("ignores lock held by another owner", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		existing := lockValue{
+			ProcessID: 2,
+			HostID:    "other-host",
+			ExpiresAt: time.Now().Add(ttl).Unix(),
+		}
+		insertLock(t, db, existing)
+
+		err := service.Release(context.Background())
+		require.NoError(t, err)
+
+		stored := readLockValue(t, db)
+		require.Equal(t, existing, stored)
+	})
+}
+
+func TestAppLockServiceRenew(t *testing.T) {
+	t.Run("extends expiration when lock is still owned", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		_, err := service.Acquire(context.Background(), false)
+		require.NoError(t, err)
+
+		before := readLockValue(t, db)
+
+		err = service.renew(context.Background())
+		require.NoError(t, err)
+
+		after := readLockValue(t, db)
+		require.Equal(t, service.processID, after.ProcessID)
+		require.Equal(t, service.hostID, after.HostID)
+		require.GreaterOrEqual(t, after.ExpiresAt, before.ExpiresAt)
+	})
+
+	t.Run("returns ErrLockLost when lock is missing", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		err := service.renew(context.Background())
+		require.ErrorIs(t, err, ErrLockLost)
+	})
+
+	t.Run("returns ErrLockLost when ownership changed", func(t *testing.T) {
+		db := testutils.NewDatabaseForTest(t)
+		service := newTestAppLockService(t, db)
+
+		_, err := service.Acquire(context.Background(), false)
+		require.NoError(t, err)
+
+		// Simulate a different process taking the lock.
+		newOwner := lockValue{
+			ProcessID: 9,
+			HostID:    "stolen-host",
+			ExpiresAt: time.Now().Add(ttl).Unix(),
+		}
+		raw, marshalErr := newOwner.Marshal()
+		require.NoError(t, marshalErr)
+		updateErr := db.Model(&model.KV{}).
+			Where("key = ?", lockKey).
+			Update("value", raw).Error
+		require.NoError(t, updateErr)
+
+		err = service.renew(context.Background())
+		require.ErrorIs(t, err, ErrLockLost)
+	})
+}
--- a/backend/internal/service/audit_log_service.go
+++ b/backend/internal/service/audit_log_service.go
@@ -34,7 +34,7 @@ func (s *AuditLogService) Create(ctx context.Context, event model.AuditLogEvent,
 	country, city, err := s.geoliteService.GetLocationByIP(ipAddress)
 	if err != nil {
 		// Log the error but don't interrupt the operation
-		slog.Warn("Failed to get IP location", "error", err)
+		slog.Warn("Failed to get IP location", slog.String("ip", ipAddress), slog.Any("error", err))
 	}

 	auditLog := model.AuditLog{
@@ -201,8 +201,8 @@ func (s *AuditLogService) ListUsernamesWithIds(ctx context.Context) (users map[s
 		WithContext(ctx).
 		Joins("User").
 		Model(&model.AuditLog{}).
-		Select("DISTINCT \"User\".id, \"User\".username").
-		Where("\"User\".username IS NOT NULL")
+		Select(`DISTINCT "User".id, "User".username`).
+		Where(`"User".username IS NOT NULL`)

 	type Result struct {
 		ID       string `gorm:"column:id"`
@@ -210,7 +210,8 @@ func (s *AuditLogService) ListUsernamesWithIds(ctx context.Context) (users map[s
 	}

 	var results []Result
-	if err := query.Find(&results).Error; err != nil {
+	err = query.Find(&results).Error
+	if err != nil {
 		return nil, fmt.Errorf("failed to query user IDs: %w", err)
 	}

@@ -246,7 +247,8 @@ func (s *AuditLogService) ListClientNames(ctx context.Context) (clientNames []st
 	}

 	var results []Result
-	if err := query.Find(&results).Error; err != nil {
+	err = query.Find(&results).Error
+	if err != nil {
 		return nil, fmt.Errorf("failed to query client IDs: %w", err)
 	}

--- a/backend/internal/service/e2etest_service.go
+++ b/backend/internal/service/e2etest_service.go
@@ -7,14 +7,12 @@ import (
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
-	"crypto/x509"
 	"encoding/base64"
 	"fmt"
 	"log/slog"
 	"path"
 	"time"

-	"github.com/fxamacker/cbor/v2"
 	"github.com/go-webauthn/webauthn/protocol"
 	"github.com/lestrrat-go/jwx/v3/jwa"
 	"github.com/lestrrat-go/jwx/v3/jwk"
@@ -36,15 +34,17 @@ type TestService struct {
 	appConfigService *AppConfigService
 	ldapService      *LdapService
 	fileStorage      storage.FileStorage
+	appLockService   *AppLockService
 	externalIdPKey   jwk.Key
 }

-func NewTestService(db *gorm.DB, appConfigService *AppConfigService, jwtService *JwtService, ldapService *LdapService, fileStorage storage.FileStorage) (*TestService, error) {
+func NewTestService(db *gorm.DB, appConfigService *AppConfigService, jwtService *JwtService, ldapService *LdapService, appLockService *AppLockService, fileStorage storage.FileStorage) (*TestService, error) {
 	s := &TestService{
 		db:               db,
 		appConfigService: appConfigService,
 		jwtService:       jwtService,
 		ldapService:      ldapService,
+		appLockService:   appLockService,
 		fileStorage:      fileStorage,
 	}
 	err := s.initExternalIdP()
@@ -98,6 +98,17 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 				DisplayName: "Craig Federighi",
 				IsAdmin:     false,
 			},
+			{
+				Base: model.Base{
+					ID: "d9256384-98ad-49a7-bc58-99ad0b4dc23c",
+				},
+				Username:    "eddy",
+				Email:       utils.Ptr("eddy.cue@test.com"),
+				FirstName:   "Eddy",
+				LastName:    "Cue",
+				DisplayName: "Eddy Cue",
+				IsAdmin:     false,
+			},
 		}
 		for _, user := range users {
 			if err := tx.Create(&user).Error; err != nil {
@@ -169,10 +180,11 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 				Base: model.Base{
 					ID: "606c7782-f2b1-49e5-8ea9-26eb1b06d018",
 				},
-				Name:         "Immich",
-				Secret:       "$2a$10$Ak.FP8riD1ssy2AGGbG.gOpnp/rBpymd74j0nxNMtW0GG1Lb4gzxe", // PYjrE9u4v9GVqXKi52eur0eb2Ci4kc0x
-				CallbackURLs: model.UrlList{"http://immich/auth/callback"},
-				CreatedByID:  utils.Ptr(users[1].ID),
+				Name:              "Immich",
+				Secret:            "$2a$10$Ak.FP8riD1ssy2AGGbG.gOpnp/rBpymd74j0nxNMtW0GG1Lb4gzxe", // PYjrE9u4v9GVqXKi52eur0eb2Ci4kc0x
+				CallbackURLs:      model.UrlList{"http://immich/auth/callback"},
+				CreatedByID:       utils.Ptr(users[1].ID),
+				IsGroupRestricted: true,
 				AllowedUserGroups: []model.UserGroup{
 					userGroups[1],
 				},
@@ -185,6 +197,7 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 				Secret:             "$2a$10$xcRReBsvkI1XI6FG8xu/pOgzeF00bH5Wy4d/NThwcdi3ZBpVq/B9a", // n4VfQeXlTzA6yKpWbR9uJcMdSx2qH0Lo
 				CallbackURLs:       model.UrlList{"http://tailscale/auth/callback"},
 				LogoutCallbackURLs: model.UrlList{"http://tailscale/auth/logout/callback"},
+				IsGroupRestricted:  true,
 				CreatedByID:        utils.Ptr(users[0].ID),
 			},
 			{
@@ -207,6 +220,20 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 					},
 				},
 			},
+			{
+				Base: model.Base{
+					ID: "c46d2090-37a0-4f2b-8748-6aa53b0c1afa",
+				},
+				Name:              "SCIM Client",
+				Secret:            "$2a$10$h4wfa8gI7zavDAxwzSq1sOwYU4e8DwK1XZ8ZweNnY5KzlJ3Iz.qdK", // nQbiuMRG7FpdK2EnDd5MBivWQeKFXohn
+				CallbackURLs:      model.UrlList{"http://scimclient/auth/callback"},
+				CreatedByID:       utils.Ptr(users[0].ID),
+				IsGroupRestricted: true,
+				AllowedUserGroups: []model.UserGroup{
+					userGroups[0],
+					userGroups[1],
+				},
+			},
 		}
 		for _, client := range oidcClients {
 			if err := tx.Create(&client).Error; err != nil {
@@ -288,8 +315,8 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 		// openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 | \
 		// openssl pkcs8 -topk8 -nocrypt | tee >(openssl pkey -pubout)

-		publicKeyPasskey1, _ := s.getCborPublicKey("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEwcOo5KV169KR67QEHrcYkeXE3CCxv2BgwnSq4VYTQxyLtdmKxegexa8JdwFKhKXa2BMI9xaN15BoL6wSCRFJhg==")
-		publicKeyPasskey2, _ := s.getCborPublicKey("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEj4qA0PrZzg8Co1C27nyUbzrp8Ewjr7eOlGI2LfrzmbL5nPhZRAdJ3hEaqrHMSnJBhfMqtQGKwDYpaLIQFAKLhw==")
+		publicKeyPasskey1, _ := base64.StdEncoding.DecodeString("pQMmIAEhWCDBw6jkpXXr0pHrtAQetxiR5cTcILG/YGDCdKrhVhNDHCJYIIu12YrF6B7Frwl3AUqEpdrYEwj3Fo3XkGgvrBIJEUmGAQI=")
+		publicKeyPasskey2, _ := base64.StdEncoding.DecodeString("pSJYIPmc+FlEB0neERqqscxKckGF8yq1AYrANiloshAUAouHAQIDJiABIVggj4qA0PrZzg8Co1C27nyUbzrp8Ewjr7eOlGI2LfrzmbI=")
 		webauthnCredentials := []model.WebauthnCredential{
 			{
 				Name:            "Passkey 1",
@@ -318,6 +345,10 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 			Challenge:        "challenge",
 			ExpiresAt:        datatype.DateTime(time.Now().Add(1 * time.Hour)),
 			UserVerification: "preferred",
+			CredentialParams: model.CredentialParameters{
+				{Type: "public-key", Algorithm: -7},
+				{Type: "public-key", Algorithm: -257},
+			},
 		}
 		if err := tx.Create(&webauthnSession).Error; err != nil {
 			return err
@@ -327,9 +358,10 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 			Base: model.Base{
 				ID: "5f1fa856-c164-4295-961e-175a0d22d725",
 			},
-			Name:   "Test API Key",
-			Key:    "6c34966f57ef2bb7857649aff0e7ab3ad67af93c846342ced3f5a07be8706c20",
-			UserID: users[0].ID,
+			Name:      "Test API Key",
+			Key:       "6c34966f57ef2bb7857649aff0e7ab3ad67af93c846342ced3f5a07be8706c20",
+			UserID:    users[0].ID,
+			ExpiresAt: datatype.DateTime(time.Now().Add(30 * 24 * time.Hour)),
 		}
 		if err := tx.Create(&apiKey).Error; err != nil {
 			return err
@@ -344,6 +376,9 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 				ExpiresAt:  datatype.DateTime(time.Now().Add(24 * time.Hour)),
 				UsageLimit: 1,
 				UsageCount: 0,
+				UserGroups: []model.UserGroup{
+					userGroups[0],
+				},
 			},
 			{
 				Base: model.Base{
@@ -379,6 +414,20 @@ func (s *TestService) SeedDatabase(baseURL string) error {
 			}
 		}

+		keyValues := []model.KV{
+			{
+				Key: jwkutils.PrivateKeyDBKey,
+				// {"alg":"RS256","d":"mvMDWSdPPvcum0c0iEHE2gbqtV2NKMmLwrl9E6K7g8lTV95SePLnW_bwyMPV7EGp7PQk3l17I5XRhFjze7GqTnFIOgKzMianPs7jv2ELtBMGK0xOPATgu1iGb70xZ6vcvuEfRyY3dJ0zr4jpUdVuXwKmx9rK4IdZn2dFCKfvSuspqIpz11RhF1ALrqDLkxGVv7ZwNh0_VhJZU9hcjG5l6xc7rQEKpPRkZp0IdjkGS8Z0FskoVaiRIWAbZuiVFB9WCW8k1czC4HQTPLpII01bUQx2ludbm0UlXRgVU9ptUUbU7GAImQqTOW8LfPGklEvcgzlIlR_oqw4P9yBxLi-yMQ","dp":"pvNCSnnhbo8Igw9psPR-DicxFnkXlu_ix4gpy6efTrxA-z1VDFDioJ814vKQNioYDzpyAP1gfMPhRkvG_q0hRZsJah3Sb9dfA-WkhSWY7lURQP4yIBTMU0PF_rEATuS7lRciYk1SOx5fqXZd3m_LP0vpBC4Ujlq6NAq6CIjCnms","dq":"TtUVGCCkPNgfOLmkYXu7dxxUCV5kB01-xAEK2OY0n0pG8vfDophH4_D_ZC7nvJ8J9uDhs_3JStexq1lIvaWtG99RNTChIEDzpdn6GH9yaVcb_eB4uJjrNm64FhF8PGCCwxA-xMCZMaARKwhMB2_IOMkxUbWboL3gnhJ2rDO_QO0","e":"AQAB","kid":"8uHDw3M6rf8","kty":"RSA","n":"yaeEL0VKoPBXIAaWXsUgmu05lAvEIIdJn0FX9lHh4JE5UY9B83C5sCNdhs9iSWzpeP11EVjWp8i3Yv2CF7c7u50BXnVBGtxpZpFC-585UXacoJ0chUmarL9GRFJcM1nPHBTFu68aRrn1rIKNHUkNaaxFo0NFGl_4EDDTO8HwawTjwkPoQlRzeByhlvGPVvwgB3Fn93B8QJ_cZhXKxJvjjrC_8Pk76heC_ntEMru71Ix77BoC3j2TuyiN7m9RNBW8BU5q6lKoIdvIeZfTFLzi37iufyfvMrJTixp9zhNB1NxlLCeOZl2MXegtiGqd2H3cbAyqoOiv9ihUWTfXj7SxJw","p":"_Yylc9e07CKdqNRD2EosMC2mrhrEa9j5oY_l00Qyy4-jmCA59Q9viyqvveRo0U7cRvFA5BWgWN6GGLh1DG3X-QBqVr0dnk3uzbobb55RYUXyPLuBZI2q6w2oasbiDwPdY7KpkVv_H-bpITQlyDvO8hhucA6rUV7F6KTQVz8M3Ms","q":"y5p3hch-7jJ21TkAhp_Vk1fLCAuD4tbErwQs2of9ja8sB4iJOs5Wn6HD3P7Mc8Plye7qaLHvzc8I5g0tPKWvC0DPd_FLPXiWwMVAzee3NUX_oGeJNOQp11y1w_KqdO9qZqHSEPZ3NcFL_SZMFgggxhM1uzRiPzsVN0lnD_6prZU","qi":"2Grt6uXHm61ji3xSdkBWNtUnj19vS1-7rFJp5SoYztVQVThf_W52BAiXKBdYZDRVoItC_VS2NvAOjeJjhYO_xQ_q3hK7MdtuXfEPpLnyXKkmWo3lrJ26wbeF6l05LexCkI7ShsOuSt-dsyaTJTszuKDIA6YOfWvfo3aVZmlWRaI","use":"sig"}
+				Value: utils.Ptr("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"),
+			},
+		}
+
+		for _, kv := range keyValues {
+			if err := tx.Create(&kv).Error; err != nil {
+				return err
+			}
+		}
+
 		return nil
 	})

@@ -426,7 +475,8 @@ func (s *TestService) ResetDatabase() error {
 }

 func (s *TestService) ResetApplicationImages(ctx context.Context) error {
-	if err := s.fileStorage.DeleteAll(ctx, "/"); err != nil {
+	err := s.fileStorage.DeleteAll(ctx, "/")
+	if err != nil {
 		slog.ErrorContext(ctx, "Error removing uploads", slog.Any("error", err))
 		return err
 	}
@@ -445,7 +495,8 @@ func (s *TestService) ResetApplicationImages(ctx context.Context) error {
 		if err != nil {
 			return err
 		}
-		if err := s.fileStorage.Save(ctx, path.Join("application-images", file.Name()), srcFile); err != nil {
+		err = s.fileStorage.Save(ctx, path.Join("application-images", file.Name()), srcFile)
+		if err != nil {
 			srcFile.Close()
 			return err
 		}
@@ -462,47 +513,29 @@ func (s *TestService) ResetAppConfig(ctx context.Context) error {
 		return err
 	}

+	// Manually set instance ID
+	err = s.appConfigService.UpdateAppConfigValues(ctx, "instanceId", "test-instance-id")
+	if err != nil {
+		return err
+	}
+
 	// Reload the app config from the database after resetting the values
-	return s.appConfigService.LoadDbConfig(ctx)
+	err = s.appConfigService.LoadDbConfig(ctx)
+	if err != nil {
+		return err
+	}
+
+	// Reload the JWK
+	if err := s.jwtService.LoadOrGenerateKey(); err != nil {
+		return err
+	}
+
+	return nil
 }

-func (s *TestService) SetJWTKeys() {
-	const privateKeyString = `{"alg":"RS256","d":"mvMDWSdPPvcum0c0iEHE2gbqtV2NKMmLwrl9E6K7g8lTV95SePLnW_bwyMPV7EGp7PQk3l17I5XRhFjze7GqTnFIOgKzMianPs7jv2ELtBMGK0xOPATgu1iGb70xZ6vcvuEfRyY3dJ0zr4jpUdVuXwKmx9rK4IdZn2dFCKfvSuspqIpz11RhF1ALrqDLkxGVv7ZwNh0_VhJZU9hcjG5l6xc7rQEKpPRkZp0IdjkGS8Z0FskoVaiRIWAbZuiVFB9WCW8k1czC4HQTPLpII01bUQx2ludbm0UlXRgVU9ptUUbU7GAImQqTOW8LfPGklEvcgzlIlR_oqw4P9yBxLi-yMQ","dp":"pvNCSnnhbo8Igw9psPR-DicxFnkXlu_ix4gpy6efTrxA-z1VDFDioJ814vKQNioYDzpyAP1gfMPhRkvG_q0hRZsJah3Sb9dfA-WkhSWY7lURQP4yIBTMU0PF_rEATuS7lRciYk1SOx5fqXZd3m_LP0vpBC4Ujlq6NAq6CIjCnms","dq":"TtUVGCCkPNgfOLmkYXu7dxxUCV5kB01-xAEK2OY0n0pG8vfDophH4_D_ZC7nvJ8J9uDhs_3JStexq1lIvaWtG99RNTChIEDzpdn6GH9yaVcb_eB4uJjrNm64FhF8PGCCwxA-xMCZMaARKwhMB2_IOMkxUbWboL3gnhJ2rDO_QO0","e":"AQAB","kid":"8uHDw3M6rf8","kty":"RSA","n":"yaeEL0VKoPBXIAaWXsUgmu05lAvEIIdJn0FX9lHh4JE5UY9B83C5sCNdhs9iSWzpeP11EVjWp8i3Yv2CF7c7u50BXnVBGtxpZpFC-585UXacoJ0chUmarL9GRFJcM1nPHBTFu68aRrn1rIKNHUkNaaxFo0NFGl_4EDDTO8HwawTjwkPoQlRzeByhlvGPVvwgB3Fn93B8QJ_cZhXKxJvjjrC_8Pk76heC_ntEMru71Ix77BoC3j2TuyiN7m9RNBW8BU5q6lKoIdvIeZfTFLzi37iufyfvMrJTixp9zhNB1NxlLCeOZl2MXegtiGqd2H3cbAyqoOiv9ihUWTfXj7SxJw","p":"_Yylc9e07CKdqNRD2EosMC2mrhrEa9j5oY_l00Qyy4-jmCA59Q9viyqvveRo0U7cRvFA5BWgWN6GGLh1DG3X-QBqVr0dnk3uzbobb55RYUXyPLuBZI2q6w2oasbiDwPdY7KpkVv_H-bpITQlyDvO8hhucA6rUV7F6KTQVz8M3Ms","q":"y5p3hch-7jJ21TkAhp_Vk1fLCAuD4tbErwQs2of9ja8sB4iJOs5Wn6HD3P7Mc8Plye7qaLHvzc8I5g0tPKWvC0DPd_FLPXiWwMVAzee3NUX_oGeJNOQp11y1w_KqdO9qZqHSEPZ3NcFL_SZMFgggxhM1uzRiPzsVN0lnD_6prZU","qi":"2Grt6uXHm61ji3xSdkBWNtUnj19vS1-7rFJp5SoYztVQVThf_W52BAiXKBdYZDRVoItC_VS2NvAOjeJjhYO_xQ_q3hK7MdtuXfEPpLnyXKkmWo3lrJ26wbeF6l05LexCkI7ShsOuSt-dsyaTJTszuKDIA6YOfWvfo3aVZmlWRaI","use":"sig"}`
-
-	privateKey, _ := jwk.ParseKey([]byte(privateKeyString))
-	_ = s.jwtService.SetKey(privateKey)
-}
-
-// getCborPublicKey decodes a Base64 encoded public key and returns the CBOR encoded COSE key
-func (s *TestService) getCborPublicKey(base64PublicKey string) ([]byte, error) {
-	decodedKey, err := base64.StdEncoding.DecodeString(base64PublicKey)
-	if err != nil {
-		return nil, fmt.Errorf("failed to decode base64 key: %w", err)
-	}
-	pubKey, err := x509.ParsePKIXPublicKey(decodedKey)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse public key: %w", err)
-	}
-
-	ecdsaPubKey, ok := pubKey.(*ecdsa.PublicKey)
-	if !ok {
-		return nil, fmt.Errorf("not an ECDSA public key")
-	}
-
-	coseKey := map[int]interface{}{
-		1:  2,                     // Key type: EC2
-		3:  -7,                    // Algorithm: ECDSA with SHA-256
-		-1: 1,                     // Curve: P-256
-		-2: ecdsaPubKey.X.Bytes(), // X coordinate
-		-3: ecdsaPubKey.Y.Bytes(), // Y coordinate
-	}
-
-	cborPublicKey, err := cbor.Marshal(coseKey)
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal COSE key: %w", err)
-	}
-
-	return cborPublicKey, nil
+func (s *TestService) ResetLock(ctx context.Context) error {
+	_, err := s.appLockService.Acquire(ctx, true)
+	return err
 }

 // SyncLdap triggers an LDAP synchronization
@@ -529,7 +562,7 @@ func (s *TestService) SetLdapTestConfig(ctx context.Context) error {
 			"ldapAttributeGroupUniqueIdentifier": "uuid",
 			"ldapAttributeGroupName":             "uid",
 			"ldapAttributeGroupMember":           "member",
-			"ldapAttributeAdminGroup":            "admin_group",
+			"ldapAdminGroupName":                 "admin_group",
 			"ldapSoftDeleteUsers":                "true",
 			"ldapEnabled":                        "true",
 		}
--- a/backend/internal/service/email_service.go
+++ b/backend/internal/service/email_service.go
@@ -78,7 +78,7 @@ func SendEmail[V any](ctx context.Context, srv *EmailService, toEmail email.Addr

 	data := &email.TemplateData[V]{
 		AppName: dbConfig.AppName.Value,
-		LogoURL: common.EnvConfig.AppURL + "/api/application-images/logo",
+		LogoURL: common.EnvConfig.AppURL + "/api/application-images/email",
 		Data:    tData,
 	}

--- a/backend/internal/service/export_service.go
+++ b/backend/internal/service/export_service.go
@@ -0,0 +1,217 @@
+package service
+
+import (
+	"archive/zip"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"path/filepath"
+
+	"gorm.io/gorm"
+
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+	"github.com/pocket-id/pocket-id/backend/internal/storage"
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+)
+
+// ExportService handles exporting Pocket ID data into a ZIP archive.
+type ExportService struct {
+	db      *gorm.DB
+	storage storage.FileStorage
+}
+
+func NewExportService(db *gorm.DB, storage storage.FileStorage) *ExportService {
+	return &ExportService{
+		db:      db,
+		storage: storage,
+	}
+}
+
+// ExportToZip performs the full export process and writes the ZIP data to the given writer.
+func (s *ExportService) ExportToZip(ctx context.Context, w io.Writer) error {
+	dbData, err := s.extractDatabase()
+	if err != nil {
+		return err
+	}
+
+	return s.writeExportZipStream(ctx, w, dbData)
+}
+
+// extractDatabase reads all tables into a DatabaseExport struct
+func (s *ExportService) extractDatabase() (DatabaseExport, error) {
+	schema, err := utils.LoadDBSchemaTypes(s.db)
+	if err != nil {
+		return DatabaseExport{}, fmt.Errorf("failed to load schema types: %w", err)
+	}
+
+	version, err := s.schemaVersion()
+	if err != nil {
+		return DatabaseExport{}, err
+	}
+
+	out := DatabaseExport{
+		Provider: s.db.Name(),
+		Version:  version,
+		Tables:   map[string][]map[string]any{},
+		// These tables need to be inserted in a specific order because of foreign key constraints
+		// Not all tables are listed here, because not all tables are order-dependent
+		TableOrder: []string{"users", "user_groups", "oidc_clients", "signup_tokens"},
+	}
+
+	for table := range schema {
+		if table == "storage" || table == "schema_migrations" {
+			continue
+		}
+		err = s.dumpTable(table, schema[table], &out)
+		if err != nil {
+			return DatabaseExport{}, err
+		}
+	}
+
+	return out, nil
+}
+
+func (s *ExportService) schemaVersion() (uint, error) {
+	var version uint
+	if err := s.db.Raw("SELECT version FROM schema_migrations").Row().Scan(&version); err != nil {
+		return 0, fmt.Errorf("failed to query schema version: %w", err)
+	}
+	return version, nil
+}
+
+// dumpTable selects all rows from a table and appends them to out.Tables
+func (s *ExportService) dumpTable(table string, types utils.DBSchemaTableTypes, out *DatabaseExport) error {
+	rows, err := s.db.Raw("SELECT * FROM " + table).Rows()
+	if err != nil {
+		return fmt.Errorf("failed to read table %s: %w", table, err)
+	}
+	defer rows.Close()
+
+	cols, _ := rows.Columns()
+	if len(cols) != len(types) {
+		// Should never happen...
+		return fmt.Errorf("mismatched columns in table (%d) and schema (%d)", len(cols), len(types))
+	}
+
+	for rows.Next() {
+		vals := s.getScanValuesForTable(cols, types)
+		err = rows.Scan(vals...)
+		if err != nil {
+			return fmt.Errorf("failed to scan row in table %s: %w", table, err)
+		}
+
+		rowMap := make(map[string]any, len(cols))
+		for i, col := range cols {
+			rowMap[col] = vals[i]
+		}
+
+		// Skip the app lock row in the kv table
+		if table == "kv" {
+			if keyPtr, ok := rowMap["key"].(*string); ok && keyPtr != nil && *keyPtr == lockKey {
+				continue
+			}
+		}
+
+		out.Tables[table] = append(out.Tables[table], rowMap)
+	}
+
+	return rows.Err()
+}
+
+func (s *ExportService) getScanValuesForTable(cols []string, types utils.DBSchemaTableTypes) []any {
+	res := make([]any, len(cols))
+	for i, col := range cols {
+		// Store a pointer
+		// Note: don't create a helper function for this switch, because it would return type "any" and mess everything up
+		// If the column is nullable, we need a pointer to a pointer!
+		switch types[col].Name {
+		case "boolean", "bool":
+			var x bool
+			if types[col].Nullable {
+				res[i] = utils.Ptr(utils.Ptr(x))
+			} else {
+				res[i] = utils.Ptr(x)
+			}
+		case "blob", "bytea", "jsonb":
+			// Treat jsonb columns as binary too
+			var x []byte
+			if types[col].Nullable {
+				res[i] = utils.Ptr(utils.Ptr(x))
+			} else {
+				res[i] = utils.Ptr(x)
+			}
+		case "timestamp", "timestamptz", "timestamp with time zone", "datetime":
+			var x datatype.DateTime
+			if types[col].Nullable {
+				res[i] = utils.Ptr(utils.Ptr(x))
+			} else {
+				res[i] = utils.Ptr(x)
+			}
+		case "integer", "int", "bigint":
+			var x int64
+			if types[col].Nullable {
+				res[i] = utils.Ptr(utils.Ptr(x))
+			} else {
+				res[i] = utils.Ptr(x)
+			}
+		default:
+			// Treat everything else as a string (including the "numeric" type)
+			var x string
+			if types[col].Nullable {
+				res[i] = utils.Ptr(utils.Ptr(x))
+			} else {
+				res[i] = utils.Ptr(x)
+			}
+		}
+	}
+
+	return res
+}
+
+func (s *ExportService) writeExportZipStream(ctx context.Context, w io.Writer, dbData DatabaseExport) error {
+	zipWriter := zip.NewWriter(w)
+
+	// Add database.json
+	jsonWriter, err := zipWriter.Create("database.json")
+	if err != nil {
+		return fmt.Errorf("failed to create database.json in zip: %w", err)
+	}
+
+	jsonEncoder := json.NewEncoder(jsonWriter)
+	jsonEncoder.SetEscapeHTML(false)
+
+	if err := jsonEncoder.Encode(dbData); err != nil {
+		return fmt.Errorf("failed to encode database.json: %w", err)
+	}
+
+	// Add uploaded files
+	if err := s.addUploadsToZip(ctx, zipWriter); err != nil {
+		return err
+	}
+
+	return zipWriter.Close()
+}
+
+// addUploadsToZip adds all files from the storage to the ZIP archive under the "uploads/" directory
+func (s *ExportService) addUploadsToZip(ctx context.Context, zipWriter *zip.Writer) error {
+	return s.storage.Walk(ctx, "/", func(p storage.ObjectInfo) error {
+		zipPath := filepath.Join("uploads", p.Path)
+
+		w, err := zipWriter.Create(zipPath)
+		if err != nil {
+			return fmt.Errorf("failed to create zip entry for %s: %w", zipPath, err)
+		}
+
+		f, _, err := s.storage.Open(ctx, p.Path)
+		if err != nil {
+			return fmt.Errorf("failed to open file %s: %w", zipPath, err)
+		}
+		defer f.Close()
+
+		if _, err := io.Copy(w, f); err != nil {
+			return fmt.Errorf("failed to copy file %s into zip: %w", zipPath, err)
+		}
+		return nil
+	})
+}
--- a/backend/internal/service/import_service.go
+++ b/backend/internal/service/import_service.go
@@ -0,0 +1,272 @@
+package service
+
+import (
+	"archive/zip"
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"slices"
+	"strings"
+
+	"gorm.io/gorm"
+
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+	"github.com/pocket-id/pocket-id/backend/internal/storage"
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+)
+
+// ImportService handles importing Pocket ID data from an exported ZIP archive.
+type ImportService struct {
+	db      *gorm.DB
+	storage storage.FileStorage
+}
+
+type DatabaseExport struct {
+	Provider   string                      `json:"provider"`
+	Version    uint                        `json:"version"`
+	Tables     map[string][]map[string]any `json:"tables"`
+	TableOrder []string                    `json:"tableOrder"`
+}
+
+func NewImportService(db *gorm.DB, storage storage.FileStorage) *ImportService {
+	return &ImportService{
+		db:      db,
+		storage: storage,
+	}
+}
+
+// ImportFromZip performs the full import process from the given ZIP reader.
+func (s *ImportService) ImportFromZip(ctx context.Context, r *zip.Reader) error {
+	dbData, err := processZipDatabaseJson(r.File)
+	if err != nil {
+		return err
+	}
+
+	err = s.ImportDatabase(dbData)
+	if err != nil {
+		return err
+	}
+
+	err = s.importUploads(ctx, r.File)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// ImportDatabase only imports the database data from the given DatabaseExport struct.
+func (s *ImportService) ImportDatabase(dbData DatabaseExport) error {
+	err := s.resetSchema(dbData.Version)
+	if err != nil {
+		return err
+	}
+
+	err = s.insertData(dbData)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// processZipDatabaseJson extracts database.json from the ZIP archive
+func processZipDatabaseJson(files []*zip.File) (dbData DatabaseExport, err error) {
+	for _, f := range files {
+		if f.Name == "database.json" {
+			return parseDatabaseJsonStream(f)
+		}
+	}
+	return dbData, errors.New("database.json not found in the ZIP file")
+}
+
+func parseDatabaseJsonStream(f *zip.File) (dbData DatabaseExport, err error) {
+	rc, err := f.Open()
+	if err != nil {
+		return dbData, fmt.Errorf("failed to open database.json: %w", err)
+	}
+	defer rc.Close()
+
+	err = json.NewDecoder(rc).Decode(&dbData)
+	if err != nil {
+		return dbData, fmt.Errorf("failed to decode database.json: %w", err)
+	}
+
+	return dbData, nil
+}
+
+// importUploads imports files from the uploads/ directory in the ZIP archive
+func (s *ImportService) importUploads(ctx context.Context, files []*zip.File) error {
+	const maxFileSize = 50 << 20 // 50 MiB
+	const uploadsPrefix = "uploads/"
+
+	for _, f := range files {
+		if !strings.HasPrefix(f.Name, uploadsPrefix) {
+			continue
+		}
+
+		if f.UncompressedSize64 > maxFileSize {
+			return fmt.Errorf("file %s too large (%d bytes)", f.Name, f.UncompressedSize64)
+		}
+
+		targetPath := strings.TrimPrefix(f.Name, uploadsPrefix)
+		if strings.HasSuffix(f.Name, "/") || targetPath == "" {
+			continue // Skip directories
+		}
+
+		err := s.storage.DeleteAll(ctx, targetPath)
+		if err != nil {
+			return fmt.Errorf("failed to delete existing file %s: %w", targetPath, err)
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+
+		buf, err := io.ReadAll(rc)
+		rc.Close()
+		if err != nil {
+			return fmt.Errorf("read file %s: %w", f.Name, err)
+		}
+
+		err = s.storage.Save(ctx, targetPath, bytes.NewReader(buf))
+		if err != nil {
+			return fmt.Errorf("failed to save file %s: %w", targetPath, err)
+		}
+	}
+
+	return nil
+}
+
+// resetSchema drops the existing schema and migrates to the target version
+func (s *ImportService) resetSchema(targetVersion uint) error {
+	sqlDb, err := s.db.DB()
+	if err != nil {
+		return fmt.Errorf("failed to get sql.DB: %w", err)
+	}
+
+	m, err := utils.GetEmbeddedMigrateInstance(sqlDb)
+	if err != nil {
+		return fmt.Errorf("failed to get migrate instance: %w", err)
+	}
+
+	if s.db.Name() == "sqlite" {
+		s.db.Exec("PRAGMA foreign_keys = OFF;")
+	}
+
+	err = m.Drop()
+	if err != nil {
+		return fmt.Errorf("failed to drop existing schema: %w", err)
+	}
+
+	if s.db.Name() == "sqlite" {
+		defer s.db.Exec("PRAGMA foreign_keys = ON;")
+	}
+
+	// Needs to be called again to re-create the schema_migrations table
+	m, err = utils.GetEmbeddedMigrateInstance(sqlDb)
+	if err != nil {
+		return fmt.Errorf("failed to get migrate instance: %w", err)
+	}
+
+	err = m.Migrate(targetVersion)
+	if err != nil {
+		return fmt.Errorf("migration failed: %w", err)
+	}
+
+	return nil
+}
+
+// insertData populates the DB with the imported data
+func (s *ImportService) insertData(dbData DatabaseExport) error {
+	schema, err := utils.LoadDBSchemaTypes(s.db)
+	if err != nil {
+		return fmt.Errorf("failed to load schema types: %w", err)
+	}
+
+	return s.db.Transaction(func(tx *gorm.DB) error {
+		// Iterate through all tables
+		// Some tables need to be processed in order
+		tables := make([]string, 0, len(dbData.Tables))
+		tables = append(tables, dbData.TableOrder...)
+
+		for t := range dbData.Tables {
+			// Skip tables already present where the order matters
+			// Also skip the schema_migrations table
+			if slices.Contains(dbData.TableOrder, t) || t == "schema_migrations" {
+				continue
+			}
+			tables = append(tables, t)
+		}
+
+		// Insert rows
+		for _, table := range tables {
+			for _, row := range dbData.Tables[table] {
+				err = normalizeRowWithSchema(row, table, schema)
+				if err != nil {
+					return fmt.Errorf("failed to normalize row for table '%s': %w", table, err)
+				}
+				err = tx.Table(table).Create(row).Error
+				if err != nil {
+					return fmt.Errorf("failed inserting into table '%s': %w", table, err)
+				}
+			}
+		}
+		return nil
+	})
+}
+
+// normalizeRowWithSchema converts row values based on the DB schema
+func normalizeRowWithSchema(row map[string]any, table string, schema utils.DBSchemaTypes) error {
+	if schema[table] == nil {
+		return fmt.Errorf("schema not found for table '%s'", table)
+	}
+
+	for col, val := range row {
+		if val == nil {
+			// If the value is nil, skip the column
+			continue
+		}
+
+		colType := schema[table][col]
+
+		switch colType.Name {
+		case "timestamp", "timestamptz", "timestamp with time zone", "datetime":
+			// Dates are stored as strings
+			str, ok := val.(string)
+			if !ok {
+				return fmt.Errorf("value for column '%s/%s' was expected to be a string, but was '%T'", table, col, val)
+			}
+			d, err := datatype.DateTimeFromString(str)
+			if err != nil {
+				return fmt.Errorf("failed to decode value for column '%s/%s' as timestamp: %w", table, col, err)
+			}
+			row[col] = d
+
+		case "blob", "bytea", "jsonb":
+			// Binary data and jsonb data is stored in the file as base64-encoded string
+			str, ok := val.(string)
+			if !ok {
+				return fmt.Errorf("value for column '%s/%s' was expected to be a string, but was '%T'", table, col, val)
+			}
+			b, err := base64.StdEncoding.DecodeString(str)
+			if err != nil {
+				return fmt.Errorf("failed to decode value for column '%s/%s' from base64: %w", table, col, err)
+			}
+
+			// For jsonb, we additionally cast to json.RawMessage
+			if colType.Name == "jsonb" {
+				row[col] = json.RawMessage(b)
+			} else {
+				row[col] = b
+			}
+		}
+	}
+
+	return nil
+}
--- a/backend/internal/service/jwt_service.go
+++ b/backend/internal/service/jwt_service.go
@@ -18,14 +18,6 @@ import (
 )

 const (
-	// PrivateKeyFile is the path in the data/keys folder where the key is stored
-	// This is a JSON file containing a key encoded as JWK
-	PrivateKeyFile = "jwt_private_key.json"
-
-	// PrivateKeyFileEncrypted is the path in the data/keys folder where the encrypted key is stored
-	// This is a encrypted JSON file containing a key encoded as JWK
-	PrivateKeyFileEncrypted = "jwt_private_key.json.enc"
-
 	// KeyUsageSigning is the usage for the private keys, for the "use" property
 	KeyUsageSigning = "sig"

@@ -56,6 +48,7 @@ const (
 )

 type JwtService struct {
+	db               *gorm.DB
 	envConfig        *common.EnvConfigSchema
 	privateKey       jwk.Key
 	keyId            string
@@ -66,7 +59,6 @@ type JwtService struct {
 func NewJwtService(db *gorm.DB, appConfigService *AppConfigService) (*JwtService, error) {
 	service := &JwtService{}

-	// Ensure keys are generated or loaded
 	err := service.init(db, appConfigService, &common.EnvConfig)
 	if err != nil {
 		return nil, err
@@ -78,14 +70,15 @@ func NewJwtService(db *gorm.DB, appConfigService *AppConfigService) (*JwtService
 func (s *JwtService) init(db *gorm.DB, appConfigService *AppConfigService, envConfig *common.EnvConfigSchema) (err error) {
 	s.appConfigService = appConfigService
 	s.envConfig = envConfig
+	s.db = db

 	// Ensure keys are generated or loaded
-	return s.loadOrGenerateKey(db)
+	return s.LoadOrGenerateKey()
 }

-func (s *JwtService) loadOrGenerateKey(db *gorm.DB) error {
+func (s *JwtService) LoadOrGenerateKey() error {
 	// Get the key provider
-	keyProvider, err := jwkutils.GetKeyProvider(db, s.envConfig, s.appConfigService.GetDbConfig().InstanceID.Value)
+	keyProvider, err := jwkutils.GetKeyProvider(s.db, s.envConfig, s.appConfigService.GetDbConfig().InstanceID.Value)
 	if err != nil {
 		return fmt.Errorf("failed to get key provider: %w", err)
 	}
@@ -93,7 +86,7 @@ func (s *JwtService) loadOrGenerateKey(db *gorm.DB) error {
 	// Try loading a key
 	key, err := keyProvider.LoadKey()
 	if err != nil {
-		return fmt.Errorf("failed to load key (provider type '%s'): %w", s.envConfig.KeysStorage, err)
+		return fmt.Errorf("failed to load key: %w", err)
 	}

 	// If we have a key, store it in the object and we're done
@@ -114,7 +107,7 @@ func (s *JwtService) loadOrGenerateKey(db *gorm.DB) error {
 	// Save the newly-generated key
 	err = keyProvider.SaveKey(s.privateKey)
 	if err != nil {
-		return fmt.Errorf("failed to save private key (provider type '%s'): %w", s.envConfig.KeysStorage, err)
+		return fmt.Errorf("failed to save private key: %w", err)
 	}

 	return nil
--- a/backend/internal/service/jwt_service_test.go
+++ b/backend/internal/service/jwt_service_test.go
--- a/backend/internal/service/ldap_service.go
+++ b/backend/internal/service/ldap_service.go
@@ -11,12 +11,14 @@ import (
 	"log/slog"
 	"net/http"
 	"net/url"
+	"path"
 	"strings"
 	"time"
 	"unicode/utf8"

 	"github.com/go-ldap/ldap/v3"
 	"github.com/google/uuid"
+	"github.com/pocket-id/pocket-id/backend/internal/storage"
 	"github.com/pocket-id/pocket-id/backend/internal/utils"
 	"golang.org/x/text/unicode/norm"
 	"gorm.io/gorm"
@@ -32,15 +34,23 @@ type LdapService struct {
 	appConfigService *AppConfigService
 	userService      *UserService
 	groupService     *UserGroupService
+	fileStorage      storage.FileStorage
 }

-func NewLdapService(db *gorm.DB, httpClient *http.Client, appConfigService *AppConfigService, userService *UserService, groupService *UserGroupService) *LdapService {
+type savePicture struct {
+	userID   string
+	username string
+	picture  string
+}
+
+func NewLdapService(db *gorm.DB, httpClient *http.Client, appConfigService *AppConfigService, userService *UserService, groupService *UserGroupService, fileStorage storage.FileStorage) *LdapService {
 	return &LdapService{
 		db:               db,
 		httpClient:       httpClient,
 		appConfigService: appConfigService,
 		userService:      userService,
 		groupService:     groupService,
+		fileStorage:      fileStorage,
 	}
 }

@@ -68,12 +78,6 @@ func (s *LdapService) createClient() (*ldap.Conn, error) {
 }

 func (s *LdapService) SyncAll(ctx context.Context) error {
-	// Start a transaction
-	tx := s.db.Begin()
-	defer func() {
-		tx.Rollback()
-	}()
-
 	// Setup LDAP connection
 	client, err := s.createClient()
 	if err != nil {
@@ -81,7 +85,13 @@ func (s *LdapService) SyncAll(ctx context.Context) error {
 	}
 	defer client.Close()

-	err = s.SyncUsers(ctx, tx, client)
+	// Start a transaction
+	tx := s.db.Begin()
+	defer func() {
+		tx.Rollback()
+	}()
+
+	savePictures, deleteFiles, err := s.SyncUsers(ctx, tx, client)
 	if err != nil {
 		return fmt.Errorf("failed to sync users: %w", err)
 	}
@@ -97,6 +107,25 @@ func (s *LdapService) SyncAll(ctx context.Context) error {
 		return fmt.Errorf("failed to commit changes to database: %w", err)
 	}

+	// Now that we've committed the transaction, we can perform operations on the storage layer
+	// First, save all new pictures
+	for _, sp := range savePictures {
+		err = s.saveProfilePicture(ctx, sp.userID, sp.picture)
+		if err != nil {
+			// This is not a fatal error
+			slog.Warn("Error saving profile picture for LDAP user", slog.String("username", sp.username), slog.Any("error", err))
+		}
+	}
+
+	// Delete all old files
+	for _, path := range deleteFiles {
+		err = s.fileStorage.Delete(ctx, path)
+		if err != nil {
+			// This is not a fatal error
+			slog.Error("Failed to delete file after LDAP sync", slog.String("path", path), slog.Any("error", err))
+		}
+	}
+
 	return nil
 }

@@ -266,7 +295,7 @@ func (s *LdapService) SyncGroups(ctx context.Context, tx *gorm.DB, client *ldap.
 }

 //nolint:gocognit
-func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.Conn) error {
+func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.Conn) (savePictures []savePicture, deleteFiles []string, err error) {
 	dbConfig := s.appConfigService.GetDbConfig()

 	searchAttrs := []string{
@@ -294,11 +323,12 @@ func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.C

 	result, err := client.Search(searchReq)
 	if err != nil {
-		return fmt.Errorf("failed to query LDAP: %w", err)
+		return nil, nil, fmt.Errorf("failed to query LDAP: %w", err)
 	}

 	// Create a mapping for users that exist
 	ldapUserIDs := make(map[string]struct{}, len(result.Entries))
+	savePictures = make([]savePicture, 0, len(result.Entries))

 	for _, value := range result.Entries {
 		ldapId := convertLdapIdToString(value.GetAttributeValue(dbConfig.LdapAttributeUserUniqueIdentifier.Value))
@@ -329,19 +359,19 @@ func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.C
 				Error

 			if err != nil {
-				return fmt.Errorf("failed to enable user %s: %w", databaseUser.Username, err)
+				return nil, nil, fmt.Errorf("failed to enable user %s: %w", databaseUser.Username, err)
 			}
 		}

 		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
 			// This could error with ErrRecordNotFound and we want to ignore that here
-			return fmt.Errorf("failed to query for LDAP user ID '%s': %w", ldapId, err)
+			return nil, nil, fmt.Errorf("failed to query for LDAP user ID '%s': %w", ldapId, err)
 		}

 		// Check if user is admin by checking if they are in the admin group
 		isAdmin := false
 		for _, group := range value.GetAttributeValues("memberOf") {
-			if getDNProperty(dbConfig.LdapAttributeGroupName.Value, group) == dbConfig.LdapAttributeAdminGroup.Value {
+			if getDNProperty(dbConfig.LdapAttributeGroupName.Value, group) == dbConfig.LdapAdminGroupName.Value {
 				isAdmin = true
 				break
 			}
@@ -369,32 +399,35 @@ func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.C
 			continue
 		}

+		userID := databaseUser.ID
 		if databaseUser.ID == "" {
-			_, err = s.userService.createUserInternal(ctx, newUser, true, tx)
+			createdUser, err := s.userService.createUserInternal(ctx, newUser, true, tx)
 			if errors.Is(err, &common.AlreadyInUseError{}) {
 				slog.Warn("Skipping creating LDAP user", slog.String("username", newUser.Username), slog.Any("error", err))
 				continue
 			} else if err != nil {
-				return fmt.Errorf("error creating user '%s': %w", newUser.Username, err)
+				return nil, nil, fmt.Errorf("error creating user '%s': %w", newUser.Username, err)
 			}
+			userID = createdUser.ID
 		} else {
 			_, err = s.userService.updateUserInternal(ctx, databaseUser.ID, newUser, false, true, tx)
 			if errors.Is(err, &common.AlreadyInUseError{}) {
 				slog.Warn("Skipping updating LDAP user", slog.String("username", newUser.Username), slog.Any("error", err))
 				continue
 			} else if err != nil {
-				return fmt.Errorf("error updating user '%s': %w", newUser.Username, err)
+				return nil, nil, fmt.Errorf("error updating user '%s': %w", newUser.Username, err)
 			}
 		}

 		// Save profile picture
 		pictureString := value.GetAttributeValue(dbConfig.LdapAttributeUserProfilePicture.Value)
 		if pictureString != "" {
-			err = s.saveProfilePicture(ctx, databaseUser.ID, pictureString)
-			if err != nil {
-				// This is not a fatal error
-				slog.Warn("Error saving profile picture for user", slog.String("username", newUser.Username), slog.Any("error", err))
-			}
+			// Storage operations must be executed outside of a transaction
+			savePictures = append(savePictures, savePicture{
+				userID:   databaseUser.ID,
+				username: userID,
+				picture:  pictureString,
+			})
 		}
 	}

@@ -406,10 +439,11 @@ func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.C
 		Select("id, username, ldap_id, disabled").
 		Error
 	if err != nil {
-		return fmt.Errorf("failed to fetch users from database: %w", err)
+		return nil, nil, fmt.Errorf("failed to fetch users from database: %w", err)
 	}

 	// Mark users as disabled or delete users that no longer exist in LDAP
+	deleteFiles = make([]string, 0, len(ldapUserIDs))
 	for _, user := range ldapUsersInDb {
 		// Skip if the user ID exists in the fetched LDAP results
 		if _, exists := ldapUserIDs[*user.LdapID]; exists {
@@ -417,30 +451,34 @@ func (s *LdapService) SyncUsers(ctx context.Context, tx *gorm.DB, client *ldap.C
 		}

 		if dbConfig.LdapSoftDeleteUsers.IsTrue() {
-			err = s.userService.disableUserInternal(ctx, user.ID, tx)
+			err = s.userService.disableUserInternal(ctx, tx, user.ID)
 			if err != nil {
-				return fmt.Errorf("failed to disable user %s: %w", user.Username, err)
+				return nil, nil, fmt.Errorf("failed to disable user %s: %w", user.Username, err)
 			}

 			slog.Info("Disabled user", slog.String("username", user.Username))
 		} else {
-			err = s.userService.deleteUserInternal(ctx, user.ID, true, tx)
-			target := &common.LdapUserUpdateError{}
-			if errors.As(err, &target) {
-				return fmt.Errorf("failed to delete user %s: LDAP user must be disabled before deletion", user.Username)
-			} else if err != nil {
-				return fmt.Errorf("failed to delete user %s: %w", user.Username, err)
+			err = s.userService.deleteUserInternal(ctx, tx, user.ID, true)
+			if err != nil {
+				target := &common.LdapUserUpdateError{}
+				if errors.As(err, &target) {
+					return nil, nil, fmt.Errorf("failed to delete user %s: LDAP user must be disabled before deletion", user.Username)
+				}
+				return nil, nil, fmt.Errorf("failed to delete user %s: %w", user.Username, err)
 			}

 			slog.Info("Deleted user", slog.String("username", user.Username))
+
+			// Storage operations must be executed outside of a transaction
+			deleteFiles = append(deleteFiles, path.Join("profile-pictures", user.ID+".png"))
 		}
 	}

-	return nil
+	return savePictures, deleteFiles, nil
 }

 func (s *LdapService) saveProfilePicture(parentCtx context.Context, userId string, pictureString string) error {
-	var reader io.Reader
+	var reader io.ReadSeeker

 	_, err := url.ParseRequestURI(pictureString)
 	if err == nil {
@@ -460,7 +498,12 @@ func (s *LdapService) saveProfilePicture(parentCtx context.Context, userId strin
 		}
 		defer res.Body.Close()

-		reader = res.Body
+		data, err := io.ReadAll(res.Body)
+		if err != nil {
+			return fmt.Errorf("failed to read profile picture: %w", err)
+		}
+
+		reader = bytes.NewReader(data)
 	} else if decodedPhoto, err := base64.StdEncoding.DecodeString(pictureString); err == nil {
 		// If the photo is a base64 encoded string, decode it
 		reader = bytes.NewReader(decodedPhoto)
--- a/backend/internal/service/oidc_service.go
+++ b/backend/internal/service/oidc_service.go
@@ -12,11 +12,9 @@ import (
 	"io"
 	"log/slog"
 	"mime/multipart"
-	"net"
 	"net/http"
 	"net/url"
 	"path"
-	"regexp"
 	"slices"
 	"strings"
 	"time"
@@ -170,7 +168,7 @@ func (s *OidcService) Authorize(ctx context.Context, input dto.AuthorizeOidcClie
 		return "", "", err
 	}

-	if !s.IsUserGroupAllowedToAuthorize(user, client) {
+	if !IsUserGroupAllowedToAuthorize(user, client) {
 		return "", "", &common.OidcAccessDeniedError{}
 	}

@@ -226,8 +224,8 @@ func (s *OidcService) hasAuthorizedClientInternal(ctx context.Context, clientID,
 }

 // IsUserGroupAllowedToAuthorize checks if the user group of the user is allowed to authorize the client
-func (s *OidcService) IsUserGroupAllowedToAuthorize(user model.User, client model.OidcClient) bool {
-	if len(client.AllowedUserGroups) == 0 {
+func IsUserGroupAllowedToAuthorize(user model.User, client model.OidcClient) bool {
+	if !client.IsGroupRestricted {
 		return true
 	}

@@ -679,19 +677,21 @@ func (s *OidcService) introspectRefreshToken(ctx context.Context, clientID strin
 }

 func (s *OidcService) GetClient(ctx context.Context, clientID string) (model.OidcClient, error) {
-	return s.getClientInternal(ctx, clientID, s.db)
+	return s.getClientInternal(ctx, clientID, s.db, false)
 }

-func (s *OidcService) getClientInternal(ctx context.Context, clientID string, tx *gorm.DB) (model.OidcClient, error) {
+func (s *OidcService) getClientInternal(ctx context.Context, clientID string, tx *gorm.DB, forUpdate bool) (model.OidcClient, error) {
 	var client model.OidcClient
-	err := tx.
+	q := tx.
 		WithContext(ctx).
 		Preload("CreatedBy").
-		Preload("AllowedUserGroups").
-		First(&client, "id = ?", clientID).
-		Error
-	if err != nil {
-		return model.OidcClient{}, err
+		Preload("AllowedUserGroups")
+	if forUpdate {
+		q = q.Clauses(clause.Locking{Strength: "UPDATE"})
+	}
+	q = q.First(&client, "id = ?", clientID)
+	if q.Error != nil {
+		return model.OidcClient{}, q.Error
 	}
 	return client, nil
 }
@@ -724,11 +724,6 @@ func (s *OidcService) ListClients(ctx context.Context, name string, listRequestO
 }

 func (s *OidcService) CreateClient(ctx context.Context, input dto.OidcClientCreateDto, userID string) (model.OidcClient, error) {
-	tx := s.db.Begin()
-	defer func() {
-		tx.Rollback()
-	}()
-
 	client := model.OidcClient{
 		Base: model.Base{
 			ID: input.ID,
@@ -737,7 +732,7 @@ func (s *OidcService) CreateClient(ctx context.Context, input dto.OidcClientCrea
 	}
 	updateOIDCClientModelFromDto(&client, &input.OidcClientUpdateDto)

-	err := tx.
+	err := s.db.
 		WithContext(ctx).
 		Create(&client).
 		Error
@@ -748,62 +743,73 @@ func (s *OidcService) CreateClient(ctx context.Context, input dto.OidcClientCrea
 		return model.OidcClient{}, err
 	}

+	// All storage operations must be executed outside of a transaction
 	if input.LogoURL != nil {
-		err = s.downloadAndSaveLogoFromURL(ctx, tx, client.ID, *input.LogoURL, true)
+		err = s.downloadAndSaveLogoFromURL(ctx, client.ID, *input.LogoURL, true)
 		if err != nil {
 			return model.OidcClient{}, fmt.Errorf("failed to download logo: %w", err)
 		}
 	}

 	if input.DarkLogoURL != nil {
-		err = s.downloadAndSaveLogoFromURL(ctx, tx, client.ID, *input.DarkLogoURL, false)
+		err = s.downloadAndSaveLogoFromURL(ctx, client.ID, *input.DarkLogoURL, false)
 		if err != nil {
 			return model.OidcClient{}, fmt.Errorf("failed to download dark logo: %w", err)
 		}
 	}

-	err = tx.Commit().Error
-	if err != nil {
-		return model.OidcClient{}, err
-	}
-
 	return client, nil
 }

 func (s *OidcService) UpdateClient(ctx context.Context, clientID string, input dto.OidcClientUpdateDto) (model.OidcClient, error) {
 	tx := s.db.Begin()
-	defer func() { tx.Rollback() }()
+	defer func() {
+		tx.Rollback()
+	}()

 	var client model.OidcClient
-	if err := tx.WithContext(ctx).
+	err := tx.WithContext(ctx).
 		Preload("CreatedBy").
-		First(&client, "id = ?", clientID).Error; err != nil {
+		First(&client, "id = ?", clientID).Error
+	if err != nil {
 		return model.OidcClient{}, err
 	}

 	updateOIDCClientModelFromDto(&client, &input)

-	if err := tx.WithContext(ctx).Save(&client).Error; err != nil {
+	if !input.IsGroupRestricted {
+		// Clear allowed user groups if the restriction is removed
+		err = tx.Model(&client).Association("AllowedUserGroups").Clear()
+		if err != nil {
+			return model.OidcClient{}, err
+		}
+	}
+
+	err = tx.WithContext(ctx).Save(&client).Error
+	if err != nil {
 		return model.OidcClient{}, err
 	}

+	err = tx.Commit().Error
+	if err != nil {
+		return model.OidcClient{}, err
+	}
+
+	// All storage operations must be executed outside of a transaction
 	if input.LogoURL != nil {
-		err := s.downloadAndSaveLogoFromURL(ctx, tx, client.ID, *input.LogoURL, true)
+		err = s.downloadAndSaveLogoFromURL(ctx, client.ID, *input.LogoURL, true)
 		if err != nil {
 			return model.OidcClient{}, fmt.Errorf("failed to download logo: %w", err)
 		}
 	}

 	if input.DarkLogoURL != nil {
-		err := s.downloadAndSaveLogoFromURL(ctx, tx, client.ID, *input.DarkLogoURL, false)
+		err = s.downloadAndSaveLogoFromURL(ctx, client.ID, *input.DarkLogoURL, false)
 		if err != nil {
 			return model.OidcClient{}, fmt.Errorf("failed to download dark logo: %w", err)
 		}
 	}

-	if err := tx.Commit().Error; err != nil {
-		return model.OidcClient{}, err
-	}
 	return client, nil
 }

@@ -817,6 +823,7 @@ func updateOIDCClientModelFromDto(client *model.OidcClient, input *dto.OidcClien
 	client.PkceEnabled = input.IsPublic || input.PkceEnabled
 	client.RequiresReauthentication = input.RequiresReauthentication
 	client.LaunchURL = input.LaunchURL
+	client.IsGroupRestricted = input.IsGroupRestricted

 	// Credentials
 	client.Credentials.FederatedIdentities = make([]model.OidcClientFederatedIdentity, len(input.Credentials.FederatedIdentities))
@@ -836,12 +843,24 @@ func (s *OidcService) DeleteClient(ctx context.Context, clientID string) error {
 	err := s.db.
 		WithContext(ctx).
 		Where("id = ?", clientID).
+		Clauses(clause.Returning{}).
 		Delete(&client).
 		Error
 	if err != nil {
 		return err
 	}

+	// Delete images if present
+	// Note that storage operations must be done outside of a transaction
+	if client.ImageType != nil && *client.ImageType != "" {
+		old := path.Join("oidc-client-images", client.ID+"."+*client.ImageType)
+		_ = s.fileStorage.Delete(ctx, old)
+	}
+	if client.DarkImageType != nil && *client.DarkImageType != "" {
+		old := path.Join("oidc-client-images", client.ID+"-dark."+*client.DarkImageType)
+		_ = s.fileStorage.Delete(ctx, old)
+	}
+
 	return nil
 }

@@ -941,57 +960,12 @@ func (s *OidcService) UpdateClientLogo(ctx context.Context, clientID string, fil
 		return err
 	}
 	defer reader.Close()
-	if err := s.fileStorage.Save(ctx, imagePath, reader); err != nil {
-		return err
-	}
-
-	tx := s.db.Begin()
-
-	err = s.updateClientLogoType(ctx, tx, clientID, fileType, light)
-	if err != nil {
-		tx.Rollback()
-		return err
-	}
-
-	return tx.Commit().Error
-}
-
-func (s *OidcService) DeleteClientLogo(ctx context.Context, clientID string) error {
-	tx := s.db.Begin()
-	defer func() {
-		tx.Rollback()
-	}()
-
-	var client model.OidcClient
-	err := tx.
-		WithContext(ctx).
-		First(&client, "id = ?", clientID).
-		Error
+	err = s.fileStorage.Save(ctx, imagePath, reader)
 	if err != nil {
 		return err
 	}

-	if client.ImageType == nil {
-		return errors.New("image not found")
-	}
-
-	oldImageType := *client.ImageType
-	client.ImageType = nil
-
-	err = tx.
-		WithContext(ctx).
-		Save(&client).
-		Error
-	if err != nil {
-		return err
-	}
-
-	imagePath := path.Join("oidc-client-images", client.ID+"."+oldImageType)
-	if err := s.fileStorage.Delete(ctx, imagePath); err != nil {
-		return err
-	}
-
-	err = tx.Commit().Error
+	err = s.updateClientLogoType(ctx, clientID, fileType, light)
 	if err != nil {
 		return err
 	}
@@ -999,7 +973,31 @@ func (s *OidcService) DeleteClientLogo(ctx context.Context, clientID string) err
 	return nil
 }

+func (s *OidcService) DeleteClientLogo(ctx context.Context, clientID string) error {
+	return s.deleteClientLogoInternal(ctx, clientID, "", func(client *model.OidcClient) (string, error) {
+		if client.ImageType == nil {
+			return "", errors.New("image not found")
+		}
+
+		oldImageType := *client.ImageType
+		client.ImageType = nil
+		return oldImageType, nil
+	})
+}
+
 func (s *OidcService) DeleteClientDarkLogo(ctx context.Context, clientID string) error {
+	return s.deleteClientLogoInternal(ctx, clientID, "-dark", func(client *model.OidcClient) (string, error) {
+		if client.DarkImageType == nil {
+			return "", errors.New("image not found")
+		}
+
+		oldImageType := *client.DarkImageType
+		client.DarkImageType = nil
+		return oldImageType, nil
+	})
+}
+
+func (s *OidcService) deleteClientLogoInternal(ctx context.Context, clientID string, imagePathSuffix string, setClientImage func(*model.OidcClient) (string, error)) error {
 	tx := s.db.Begin()
 	defer func() {
 		tx.Rollback()
@@ -1014,13 +1012,11 @@ func (s *OidcService) DeleteClientDarkLogo(ctx context.Context, clientID string)
 		return err
 	}

-	if client.DarkImageType == nil {
-		return errors.New("image not found")
+	oldImageType, err := setClientImage(&client)
+	if err != nil {
+		return err
 	}

-	oldImageType := *client.DarkImageType
-	client.DarkImageType = nil
-
 	err = tx.
 		WithContext(ctx).
 		Save(&client).
@@ -1029,12 +1025,14 @@ func (s *OidcService) DeleteClientDarkLogo(ctx context.Context, clientID string)
 		return err
 	}

-	imagePath := path.Join("oidc-client-images", client.ID+"-dark."+oldImageType)
-	if err := s.fileStorage.Delete(ctx, imagePath); err != nil {
+	err = tx.Commit().Error
+	if err != nil {
 		return err
 	}

-	err = tx.Commit().Error
+	// All storage operations must be performed outside of a database transaction
+	imagePath := path.Join("oidc-client-images", client.ID+imagePathSuffix+"."+oldImageType)
+	err = s.fileStorage.Delete(ctx, imagePath)
 	if err != nil {
 		return err
 	}
@@ -1048,7 +1046,7 @@ func (s *OidcService) UpdateAllowedUserGroups(ctx context.Context, id string, in
 		tx.Rollback()
 	}()

-	client, err = s.getClientInternal(ctx, id, tx)
+	client, err = s.getClientInternal(ctx, id, tx, true)
 	if err != nil {
 		return model.OidcClient{}, err
 	}
@@ -1206,7 +1204,7 @@ func (s *OidcService) getCallbackURL(client *model.OidcClient, inputCallbackURL

 	// If URLs are already configured, validate against them
 	if len(client.CallbackURLs) > 0 {
-		matched, err := s.getCallbackURLFromList(client.CallbackURLs, inputCallbackURL)
+		matched, err := utils.GetCallbackURLFromList(client.CallbackURLs, inputCallbackURL)
 		if err != nil {
 			return "", err
 		} else if matched == "" {
@@ -1229,7 +1227,7 @@ func (s *OidcService) getLogoutCallbackURL(client *model.OidcClient, inputLogout
 		return client.LogoutCallbackURLs[0], nil
 	}

-	matched, err := s.getCallbackURLFromList(client.LogoutCallbackURLs, inputLogoutCallbackURL)
+	matched, err := utils.GetCallbackURLFromList(client.LogoutCallbackURLs, inputLogoutCallbackURL)
 	if err != nil {
 		return "", err
 	} else if matched == "" {
@@ -1239,21 +1237,6 @@ func (s *OidcService) getLogoutCallbackURL(client *model.OidcClient, inputLogout
 	return matched, nil
 }

-func (s *OidcService) getCallbackURLFromList(urls []string, inputCallbackURL string) (callbackURL string, err error) {
-	for _, callbackPattern := range urls {
-		regexPattern := "^" + strings.ReplaceAll(regexp.QuoteMeta(callbackPattern), `\*`, ".*") + "$"
-		matched, err := regexp.MatchString(regexPattern, inputCallbackURL)
-		if err != nil {
-			return "", err
-		}
-		if matched {
-			return inputCallbackURL, nil
-		}
-	}
-
-	return "", nil
-}
-
 func (s *OidcService) addCallbackURLToClient(ctx context.Context, client *model.OidcClient, callbackURL string, tx *gorm.DB) error {
 	// Add the new callback URL to the existing list
 	client.CallbackURLs = append(client.CallbackURLs, callbackURL)
@@ -1342,7 +1325,7 @@ func (s *OidcService) VerifyDeviceCode(ctx context.Context, userCode string, use
 		return fmt.Errorf("error finding user groups: %w", err)
 	}

-	if !s.IsUserGroupAllowedToAuthorize(user, deviceAuth.Client) {
+	if !IsUserGroupAllowedToAuthorize(user, deviceAuth.Client) {
 		return &common.OidcAccessDeniedError{}
 	}

@@ -1831,7 +1814,7 @@ func (s *OidcService) GetClientPreview(ctx context.Context, clientID string, use
 		tx.Rollback()
 	}()

-	client, err := s.getClientInternal(ctx, clientID, tx)
+	client, err := s.getClientInternal(ctx, clientID, tx, false)
 	if err != nil {
 		return nil, err
 	}
@@ -1846,7 +1829,7 @@ func (s *OidcService) GetClientPreview(ctx context.Context, clientID string, use
 		return nil, err
 	}

-	if !s.IsUserGroupAllowedToAuthorize(user, client) {
+	if !IsUserGroupAllowedToAuthorize(user, client) {
 		return nil, &common.OidcAccessDeniedError{}
 	}

@@ -1973,10 +1956,28 @@ func (s *OidcService) IsClientAccessibleToUser(ctx context.Context, clientID str
 		return false, err
 	}

-	return s.IsUserGroupAllowedToAuthorize(user, client), nil
+	return IsUserGroupAllowedToAuthorize(user, client), nil
 }

-func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, tx *gorm.DB, clientID string, raw string, light bool) error {
+var errLogoTooLarge = errors.New("logo is too large")
+
+func httpClientWithCheckRedirect(source *http.Client, checkRedirect func(req *http.Request, via []*http.Request) error) *http.Client {
+	if source == nil {
+		source = http.DefaultClient
+	}
+
+	// Create a new client that clones the transport
+	client := &http.Client{
+		Transport: source.Transport,
+	}
+
+	// Assign the CheckRedirect function
+	client.CheckRedirect = checkRedirect
+
+	return client
+}
+
+func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, clientID string, raw string, light bool) error {
 	u, err := url.Parse(raw)
 	if err != nil {
 		return err
@@ -1985,18 +1986,29 @@ func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, tx *
 	ctx, cancel := context.WithTimeout(parentCtx, 15*time.Second)
 	defer cancel()

-	r := net.Resolver{}
-	ips, err := r.LookupIPAddr(ctx, u.Hostname())
-	if err != nil || len(ips) == 0 {
-		return fmt.Errorf("cannot resolve hostname")
+	// Prevents SSRF by allowing only public IPs
+	ok, err := utils.IsURLPrivate(ctx, u)
+	if err != nil {
+		return err
+	} else if ok {
+		return errors.New("private IP addresses are not allowed")
 	}

-	// Prevents SSRF by allowing only public IPs
-	for _, addr := range ips {
-		if utils.IsPrivateIP(addr.IP) {
-			return fmt.Errorf("private IP addresses are not allowed")
+	// We need to check this on redirects too
+	client := httpClientWithCheckRedirect(s.httpClient, func(r *http.Request, via []*http.Request) error {
+		if len(via) >= 10 {
+			return errors.New("stopped after 10 redirects")
 		}
-	}
+
+		ok, err := utils.IsURLPrivate(r.Context(), r.URL)
+		if err != nil {
+			return err
+		} else if ok {
+			return errors.New("private IP addresses are not allowed")
+		}
+
+		return nil
+	})

 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, raw, nil)
 	if err != nil {
@@ -2005,7 +2017,7 @@ func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, tx *
 	req.Header.Set("User-Agent", "pocket-id/oidc-logo-fetcher")
 	req.Header.Set("Accept", "image/*")

-	resp, err := s.httpClient.Do(req)
+	resp, err := client.Do(req)
 	if err != nil {
 		return err
 	}
@@ -2017,7 +2029,7 @@ func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, tx *

 	const maxLogoSize int64 = 2 * 1024 * 1024 // 2MB
 	if resp.ContentLength > maxLogoSize {
-		return fmt.Errorf("logo is too large")
+		return errLogoTooLarge
 	}

 	// Prefer extension in path if supported
@@ -2037,48 +2049,83 @@ func (s *OidcService) downloadAndSaveLogoFromURL(parentCtx context.Context, tx *
 	}

 	imagePath := path.Join("oidc-client-images", clientID+darkSuffix+"."+ext)
-	if err := s.fileStorage.Save(ctx, imagePath, io.LimitReader(resp.Body, maxLogoSize+1)); err != nil {
+	err = s.fileStorage.Save(ctx, imagePath, utils.NewLimitReader(resp.Body, maxLogoSize+1))
+	if errors.Is(err, utils.ErrSizeExceeded) {
+		return errLogoTooLarge
+	} else if err != nil {
 		return err
 	}

-	if err := s.updateClientLogoType(ctx, tx, clientID, ext, light); err != nil {
+	err = s.updateClientLogoType(ctx, clientID, ext, light)
+	if err != nil {
 		return err
 	}

 	return nil
 }

-func (s *OidcService) updateClientLogoType(ctx context.Context, tx *gorm.DB, clientID, ext string, light bool) error {
+func (s *OidcService) updateClientLogoType(ctx context.Context, clientID string, ext string, light bool) error {
 	var darkSuffix string
 	if !light {
 		darkSuffix = "-dark"
 	}

+	tx := s.db.Begin()
+	defer func() {
+		tx.Rollback()
+	}()
+
+	// We need to acquire an update lock for the row to be locked, since we'll update it later
 	var client model.OidcClient
-	if err := tx.WithContext(ctx).First(&client, "id = ?", clientID).Error; err != nil {
-		return err
+	err := tx.
+		WithContext(ctx).
+		Clauses(clause.Locking{Strength: "UPDATE"}).
+		First(&client, "id = ?", clientID).
+		Error
+	if err != nil {
+		return fmt.Errorf("failed to look up client: %w", err)
 	}
+
 	var currentType *string
 	if light {
 		currentType = client.ImageType
+		client.ImageType = &ext
 	} else {
 		currentType = client.DarkImageType
+		client.DarkImageType = &ext
 	}
+
+	err = tx.
+		WithContext(ctx).
+		Save(&client).
+		Error
+	if err != nil {
+		return fmt.Errorf("failed to save updated client: %w", err)
+	}
+
+	err = tx.Commit().Error
+	if err != nil {
+		return fmt.Errorf("failed to commit transaction: %w", err)
+	}
+
+	// Storage operations must be executed outside of a transaction
 	if currentType != nil && *currentType != ext {
 		old := path.Join("oidc-client-images", client.ID+darkSuffix+"."+*currentType)
 		_ = s.fileStorage.Delete(ctx, old)
 	}

-	var column string
-	if light {
-		column = "image_type"
-	} else {
-		column = "dark_image_type"
+	return nil
+}
+
+func (s *OidcService) GetClientScimServiceProvider(ctx context.Context, clientID string) (model.ScimServiceProvider, error) {
+	var provider model.ScimServiceProvider
+	err := s.db.
+		WithContext(ctx).
+		First(&provider, "oidc_client_id = ?", clientID).
+		Error
+	if err != nil {
+		return model.ScimServiceProvider{}, err
 	}

-	return tx.WithContext(ctx).
-		Model(&model.OidcClient{}).
-		Where("id = ?", clientID).
-		Update(column, ext).
-		Error
+	return provider, nil
 }
--- a/backend/internal/service/oidc_service_test.go
+++ b/backend/internal/service/oidc_service_test.go
@@ -8,7 +8,10 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"encoding/json"
+	"io"
 	"net/http"
+	"strconv"
+	"strings"
 	"testing"
 	"time"

@@ -21,6 +24,7 @@ import (
 	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/dto"
 	"github.com/pocket-id/pocket-id/backend/internal/model"
+	"github.com/pocket-id/pocket-id/backend/internal/storage"
 	testutils "github.com/pocket-id/pocket-id/backend/internal/utils/testing"
 )

@@ -144,6 +148,7 @@ func TestOidcService_verifyClientCredentialsInternal(t *testing.T) {
 	var err error
 	// Create a test database
 	db := testutils.NewDatabaseForTest(t)
+	common.EnvConfig.EncryptionKey = []byte("0123456789abcdef0123456789abcdef")

 	// Create two JWKs for testing
 	privateJWK, jwkSetJSON := generateTestECDSAKey(t)
@@ -537,3 +542,435 @@ func TestValidateCodeVerifier_Plain(t *testing.T) {
 		require.False(t, validateCodeVerifier("NOT!VALID", codeChallenge, true))
 	})
 }
+
+func TestOidcService_updateClientLogoType(t *testing.T) {
+	// Create a test database
+	db := testutils.NewDatabaseForTest(t)
+
+	// Create database storage
+	dbStorage, err := storage.NewDatabaseStorage(db)
+	require.NoError(t, err)
+
+	// Init the OidcService
+	s := &OidcService{
+		db:          db,
+		fileStorage: dbStorage,
+	}
+
+	// Create a test client
+	client := model.OidcClient{
+		Name:         "Test Client",
+		CallbackURLs: model.UrlList{"https://example.com/callback"},
+	}
+	err = db.Create(&client).Error
+	require.NoError(t, err)
+
+	// Helper function to check if a file exists in storage
+	fileExists := func(t *testing.T, path string) bool {
+		t.Helper()
+		_, _, err := dbStorage.Open(t.Context(), path)
+		return err == nil
+	}
+
+	// Helper function to create a dummy file in storage
+	createDummyFile := func(t *testing.T, path string) {
+		t.Helper()
+		err := dbStorage.Save(t.Context(), path, strings.NewReader("dummy content"))
+		require.NoError(t, err)
+	}
+
+	t.Run("Updates light logo type for client without previous logo", func(t *testing.T) {
+		// Update the logo type
+		err := s.updateClientLogoType(t.Context(), client.ID, "png", true)
+		require.NoError(t, err)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.ImageType)
+		assert.Equal(t, "png", *updatedClient.ImageType)
+	})
+
+	t.Run("Updates dark logo type for client without previous dark logo", func(t *testing.T) {
+		// Update the dark logo type
+		err := s.updateClientLogoType(t.Context(), client.ID, "jpg", false)
+		require.NoError(t, err)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.DarkImageType)
+		assert.Equal(t, "jpg", *updatedClient.DarkImageType)
+	})
+
+	t.Run("Updates light logo type and deletes old file when type changes", func(t *testing.T) {
+		// Create the old PNG file in storage
+		oldPath := "oidc-client-images/" + client.ID + ".png"
+		createDummyFile(t, oldPath)
+		require.True(t, fileExists(t, oldPath), "Old file should exist before update")
+
+		// Client currently has a PNG logo, update to WEBP
+		err := s.updateClientLogoType(t.Context(), client.ID, "webp", true)
+		require.NoError(t, err)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.ImageType)
+		assert.Equal(t, "webp", *updatedClient.ImageType)
+
+		// Old PNG file should be deleted
+		assert.False(t, fileExists(t, oldPath), "Old PNG file should have been deleted")
+	})
+
+	t.Run("Updates dark logo type and deletes old file when type changes", func(t *testing.T) {
+		// Create the old JPG dark file in storage
+		oldPath := "oidc-client-images/" + client.ID + "-dark.jpg"
+		createDummyFile(t, oldPath)
+		require.True(t, fileExists(t, oldPath), "Old dark file should exist before update")
+
+		// Client currently has a JPG dark logo, update to WEBP
+		err := s.updateClientLogoType(t.Context(), client.ID, "webp", false)
+		require.NoError(t, err)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.DarkImageType)
+		assert.Equal(t, "webp", *updatedClient.DarkImageType)
+
+		// Old JPG dark file should be deleted
+		assert.False(t, fileExists(t, oldPath), "Old JPG dark file should have been deleted")
+	})
+
+	t.Run("Does not delete file when type remains the same", func(t *testing.T) {
+		// Create the WEBP file in storage
+		webpPath := "oidc-client-images/" + client.ID + ".webp"
+		createDummyFile(t, webpPath)
+		require.True(t, fileExists(t, webpPath), "WEBP file should exist before update")
+
+		// Update to the same type (WEBP)
+		err := s.updateClientLogoType(t.Context(), client.ID, "webp", true)
+		require.NoError(t, err)
+
+		// Verify the client still has WEBP
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.ImageType)
+		assert.Equal(t, "webp", *updatedClient.ImageType)
+
+		// WEBP file should still exist since type didn't change
+		assert.True(t, fileExists(t, webpPath), "WEBP file should still exist")
+	})
+
+	t.Run("Returns error for non-existent client", func(t *testing.T) {
+		err := s.updateClientLogoType(t.Context(), "non-existent-client-id", "png", true)
+		require.Error(t, err)
+		require.ErrorContains(t, err, "failed to look up client")
+	})
+}
+
+func TestOidcService_downloadAndSaveLogoFromURL(t *testing.T) {
+	// Create a test database
+	db := testutils.NewDatabaseForTest(t)
+
+	// Create database storage
+	dbStorage, err := storage.NewDatabaseStorage(db)
+	require.NoError(t, err)
+
+	// Create a test client
+	client := model.OidcClient{
+		Name:         "Test Client",
+		CallbackURLs: model.UrlList{"https://example.com/callback"},
+	}
+	err = db.Create(&client).Error
+	require.NoError(t, err)
+
+	// Helper function to check if a file exists in storage
+	fileExists := func(t *testing.T, path string) bool {
+		t.Helper()
+		_, _, err := dbStorage.Open(t.Context(), path)
+		return err == nil
+	}
+
+	// Helper function to get file content from storage
+	getFileContent := func(t *testing.T, path string) []byte {
+		t.Helper()
+		reader, _, err := dbStorage.Open(t.Context(), path)
+		require.NoError(t, err)
+		defer reader.Close()
+		content, err := io.ReadAll(reader)
+		require.NoError(t, err)
+		return content
+	}
+
+	t.Run("Successfully downloads and saves PNG logo from URL", func(t *testing.T) {
+		// Create mock PNG content
+		pngContent := []byte("fake-png-content")
+
+		// Create a mock HTTP response with headers
+		//nolint:bodyclose
+		pngResponse := testutils.NewMockResponse(http.StatusOK, string(pngContent))
+		pngResponse.Header.Set("Content-Type", "image/png")
+
+		// Create a mock HTTP client with responses
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/logo.png": pngResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		// Init the OidcService with mock HTTP client
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		// Download and save the logo
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/logo.png", true)
+		require.NoError(t, err)
+
+		// Verify the file was saved
+		logoPath := "oidc-client-images/" + client.ID + ".png"
+		require.True(t, fileExists(t, logoPath), "Logo file should exist in storage")
+
+		// Verify the content
+		savedContent := getFileContent(t, logoPath)
+		assert.Equal(t, pngContent, savedContent)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.ImageType)
+		assert.Equal(t, "png", *updatedClient.ImageType)
+	})
+
+	t.Run("Successfully downloads and saves dark logo", func(t *testing.T) {
+		// Create mock WEBP content
+		webpContent := []byte("fake-webp-content")
+
+		//nolint:bodyclose
+		webpResponse := testutils.NewMockResponse(http.StatusOK, string(webpContent))
+		webpResponse.Header.Set("Content-Type", "image/webp")
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/dark-logo.webp": webpResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		// Download and save the dark logo
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/dark-logo.webp", false)
+		require.NoError(t, err)
+
+		// Verify the dark logo file was saved
+		darkLogoPath := "oidc-client-images/" + client.ID + "-dark.webp"
+		require.True(t, fileExists(t, darkLogoPath), "Dark logo file should exist in storage")
+
+		// Verify the content
+		savedContent := getFileContent(t, darkLogoPath)
+		assert.Equal(t, webpContent, savedContent)
+
+		// Verify the client was updated
+		var updatedClient model.OidcClient
+		err = db.First(&updatedClient, "id = ?", client.ID).Error
+		require.NoError(t, err)
+		require.NotNil(t, updatedClient.DarkImageType)
+		assert.Equal(t, "webp", *updatedClient.DarkImageType)
+	})
+
+	t.Run("Detects extension from URL path", func(t *testing.T) {
+		svgContent := []byte("<svg></svg>")
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/icon.svg": testutils.NewMockResponse(http.StatusOK, string(svgContent)),
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/icon.svg", true)
+		require.NoError(t, err)
+
+		// Verify SVG file was saved
+		logoPath := "oidc-client-images/" + client.ID + ".svg"
+		require.True(t, fileExists(t, logoPath), "SVG logo should exist")
+	})
+
+	t.Run("Detects extension from Content-Type when path has no extension", func(t *testing.T) {
+		jpgContent := []byte("fake-jpg-content")
+
+		//nolint:bodyclose
+		jpgResponse := testutils.NewMockResponse(http.StatusOK, string(jpgContent))
+		jpgResponse.Header.Set("Content-Type", "image/jpeg")
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/logo": jpgResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/logo", true)
+		require.NoError(t, err)
+
+		// Verify JPG file was saved (jpeg extension is normalized to jpg)
+		logoPath := "oidc-client-images/" + client.ID + ".jpg"
+		require.True(t, fileExists(t, logoPath), "JPG logo should exist")
+	})
+
+	t.Run("Returns error for invalid URL", func(t *testing.T) {
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  &http.Client{},
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "://invalid-url", true)
+		require.Error(t, err)
+	})
+
+	t.Run("Returns error for non-200 status code", func(t *testing.T) {
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/not-found.png": testutils.NewMockResponse(http.StatusNotFound, "Not Found"),
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/not-found.png", true)
+		require.Error(t, err)
+		require.ErrorContains(t, err, "failed to fetch logo")
+	})
+
+	t.Run("Returns error for too large content", func(t *testing.T) {
+		// Create content larger than 2MB (maxLogoSize)
+		largeContent := strings.Repeat("x", 2<<20+100) // 2.1MB
+
+		//nolint:bodyclose
+		largeResponse := testutils.NewMockResponse(http.StatusOK, largeContent)
+		largeResponse.Header.Set("Content-Type", "image/png")
+		largeResponse.Header.Set("Content-Length", strconv.Itoa(len(largeContent)))
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/large.png": largeResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/large.png", true)
+		require.Error(t, err)
+		require.ErrorIs(t, err, errLogoTooLarge)
+	})
+
+	t.Run("Returns error for unsupported file type", func(t *testing.T) {
+		//nolint:bodyclose
+		textResponse := testutils.NewMockResponse(http.StatusOK, "text content")
+		textResponse.Header.Set("Content-Type", "text/plain")
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/file.txt": textResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), client.ID, "https://example.com/file.txt", true)
+		require.Error(t, err)
+		var fileTypeErr *common.FileTypeNotSupportedError
+		require.ErrorAs(t, err, &fileTypeErr)
+	})
+
+	t.Run("Returns error for non-existent client", func(t *testing.T) {
+		//nolint:bodyclose
+		pngResponse := testutils.NewMockResponse(http.StatusOK, "content")
+		pngResponse.Header.Set("Content-Type", "image/png")
+
+		mockResponses := map[string]*http.Response{
+			//nolint:bodyclose
+			"https://example.com/logo.png": pngResponse,
+		}
+		httpClient := &http.Client{
+			Transport: &testutils.MockRoundTripper{
+				Responses: mockResponses,
+			},
+		}
+
+		s := &OidcService{
+			db:          db,
+			fileStorage: dbStorage,
+			httpClient:  httpClient,
+		}
+
+		err := s.downloadAndSaveLogoFromURL(t.Context(), "non-existent-client-id", "https://example.com/logo.png", true)
+		require.Error(t, err)
+		require.ErrorContains(t, err, "failed to look up client")
+	})
+}
--- a/backend/internal/service/scim_scheduler_service.go
+++ b/backend/internal/service/scim_scheduler_service.go
@@ -0,0 +1,136 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"sync"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// ScimSchedulerService schedules and triggers periodic synchronization
+// of SCIM service providers. Each provider is tracked independently,
+// and sync operations are run at or after their scheduled time.
+type ScimSchedulerService struct {
+	scimService      *ScimService
+	providerSyncTime map[string]time.Time
+	mu               sync.RWMutex
+}
+
+func NewScimSchedulerService(ctx context.Context, scimService *ScimService) (*ScimSchedulerService, error) {
+	s := &ScimSchedulerService{
+		scimService:      scimService,
+		providerSyncTime: make(map[string]time.Time),
+	}
+
+	err := s.start(ctx)
+	return s, err
+}
+
+// ScheduleSync forces the given provider to be synced soon by
+// moving its next scheduled time to 5 minutes from now.
+func (s *ScimSchedulerService) ScheduleSync(providerID string) {
+	s.setSyncTime(providerID, 5*time.Minute)
+}
+
+// start initializes the scheduler and begins the synchronization loop.
+// Syncs happen every hour by default, but ScheduleSync can be called to schedule a sync sooner.
+func (s *ScimSchedulerService) start(ctx context.Context) error {
+	if err := s.refreshProviders(ctx); err != nil {
+		return err
+	}
+
+	go func() {
+		const (
+			syncCheckInterval    = 5 * time.Second
+			providerRefreshDelay = time.Minute
+		)
+
+		ticker := time.NewTicker(syncCheckInterval)
+		defer ticker.Stop()
+		lastProviderRefresh := time.Now()
+
+		for {
+			select {
+			case <-ctx.Done():
+				return
+				// Runs every 5 seconds to check if any provider is due for sync
+			case <-ticker.C:
+				now := time.Now()
+				if now.Sub(lastProviderRefresh) >= providerRefreshDelay {
+					err := s.refreshProviders(ctx)
+					if err != nil {
+						slog.Error("Error refreshing SCIM service providers",
+							slog.Any("error", err),
+						)
+					} else {
+						lastProviderRefresh = now
+					}
+				}
+
+				var due []string
+				s.mu.RLock()
+				for providerID, syncTime := range s.providerSyncTime {
+					if !syncTime.After(now) {
+						due = append(due, providerID)
+					}
+				}
+				s.mu.RUnlock()
+
+				s.syncProviders(ctx, due)
+
+			}
+		}
+	}()
+
+	return nil
+}
+
+func (s *ScimSchedulerService) refreshProviders(ctx context.Context) error {
+	providers, err := s.scimService.ListServiceProviders(ctx)
+	if err != nil {
+		return err
+	}
+
+	inAHour := time.Now().Add(time.Hour)
+
+	s.mu.Lock()
+	for _, provider := range providers {
+		if _, exists := s.providerSyncTime[provider.ID]; !exists {
+			s.providerSyncTime[provider.ID] = inAHour
+		}
+	}
+	s.mu.Unlock()
+
+	return nil
+}
+
+func (s *ScimSchedulerService) syncProviders(ctx context.Context, providerIDs []string) {
+	for _, providerID := range providerIDs {
+		err := s.scimService.SyncServiceProvider(ctx, providerID)
+		if err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				// Remove the provider from the schedule if it no longer exists
+				s.mu.Lock()
+				delete(s.providerSyncTime, providerID)
+				s.mu.Unlock()
+			} else {
+				slog.Error("Error syncing SCIM client",
+					slog.String("provider_id", providerID),
+					slog.Any("error", err),
+				)
+			}
+			continue
+		}
+		// A successful sync schedules the next sync in an hour
+		s.setSyncTime(providerID, time.Hour)
+	}
+}
+
+func (s *ScimSchedulerService) setSyncTime(providerID string, t time.Duration) {
+	s.mu.Lock()
+	s.providerSyncTime[providerID] = time.Now().Add(t)
+	s.mu.Unlock()
+}
--- a/backend/internal/service/scim_service.go
+++ b/backend/internal/service/scim_service.go
@@ -0,0 +1,774 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/pocket-id/pocket-id/backend/internal/dto"
+	"github.com/pocket-id/pocket-id/backend/internal/model"
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+	"gorm.io/gorm"
+)
+
+const (
+	scimUserSchema  = "urn:ietf:params:scim:schemas:core:2.0:User"
+	scimGroupSchema = "urn:ietf:params:scim:schemas:core:2.0:Group"
+	scimContentType = "application/scim+json"
+)
+
+const scimErrorBodyLimit = 4096
+
+type scimSyncAction int
+
+const (
+	scimActionNone scimSyncAction = iota
+	scimActionCreated
+	scimActionUpdated
+	scimActionDeleted
+)
+
+type scimSyncStats struct {
+	Created int
+	Updated int
+	Deleted int
+}
+
+// ScimService handles SCIM provisioning to external service providers.
+type ScimService struct {
+	db         *gorm.DB
+	httpClient *http.Client
+}
+
+func NewScimService(db *gorm.DB, httpClient *http.Client) *ScimService {
+	if httpClient == nil {
+		httpClient = &http.Client{Timeout: 20 * time.Second}
+	}
+
+	return &ScimService{db: db, httpClient: httpClient}
+}
+
+func (s *ScimService) GetServiceProvider(
+	ctx context.Context,
+	serviceProviderID string,
+) (model.ScimServiceProvider, error) {
+	var provider model.ScimServiceProvider
+	err := s.db.WithContext(ctx).
+		Preload("OidcClient").
+		Preload("OidcClient.AllowedUserGroups").
+		First(&provider, "id = ?", serviceProviderID).
+		Error
+	if err != nil {
+		return model.ScimServiceProvider{}, err
+	}
+	return provider, nil
+}
+
+func (s *ScimService) ListServiceProviders(ctx context.Context) ([]model.ScimServiceProvider, error) {
+	var providers []model.ScimServiceProvider
+	err := s.db.WithContext(ctx).
+		Preload("OidcClient").
+		Find(&providers).
+		Error
+	if err != nil {
+		return nil, err
+	}
+	return providers, nil
+}
+
+func (s *ScimService) CreateServiceProvider(
+	ctx context.Context,
+	input *dto.ScimServiceProviderCreateDTO) (model.ScimServiceProvider, error) {
+	provider := model.ScimServiceProvider{
+		Endpoint:     input.Endpoint,
+		Token:        datatype.EncryptedString(input.Token),
+		OidcClientID: input.OidcClientID,
+	}
+
+	if err := s.db.WithContext(ctx).Create(&provider).Error; err != nil {
+		return model.ScimServiceProvider{}, err
+	}
+
+	return provider, nil
+}
+
+func (s *ScimService) UpdateServiceProvider(ctx context.Context,
+	serviceProviderID string,
+	input *dto.ScimServiceProviderCreateDTO,
+) (model.ScimServiceProvider, error) {
+	var provider model.ScimServiceProvider
+	err := s.db.WithContext(ctx).
+		First(&provider, "id = ?", serviceProviderID).
+		Error
+	if err != nil {
+		return model.ScimServiceProvider{}, err
+	}
+
+	provider.Endpoint = input.Endpoint
+	provider.Token = datatype.EncryptedString(input.Token)
+	provider.OidcClientID = input.OidcClientID
+
+	if err := s.db.WithContext(ctx).Save(&provider).Error; err != nil {
+		return model.ScimServiceProvider{}, err
+	}
+
+	return provider, nil
+}
+
+func (s *ScimService) DeleteServiceProvider(ctx context.Context, serviceProviderID string) error {
+	return s.db.WithContext(ctx).
+		Delete(&model.ScimServiceProvider{}, "id = ?", serviceProviderID).
+		Error
+}
+
+func (s *ScimService) SyncServiceProvider(ctx context.Context, serviceProviderID string) error {
+	start := time.Now()
+	provider, err := s.GetServiceProvider(ctx, serviceProviderID)
+	if err != nil {
+		return err
+	}
+
+	slog.InfoContext(ctx, "Syncing SCIM service provider",
+		slog.String("provider_id", provider.ID),
+		slog.String("oidc_client_id", provider.OidcClientID),
+	)
+
+	allowedGroupIDs := groupIDs(provider.OidcClient.AllowedUserGroups)
+
+	// Load users and groups that should be synced to the SCIM provider
+	groups, err := s.groupsForClient(ctx, provider.OidcClient, allowedGroupIDs)
+	if err != nil {
+		return err
+	}
+	users, err := s.usersForClient(ctx, provider.OidcClient, allowedGroupIDs)
+	if err != nil {
+		return err
+	}
+
+	// Load users and groups that already exist in the SCIM provider
+	userResources, err := listScimResources[dto.ScimUser](s, ctx, provider, "/Users")
+	if err != nil {
+		return err
+	}
+	groupResources, err := listScimResources[dto.ScimGroup](s, ctx, provider, "/Groups")
+	if err != nil {
+		return err
+	}
+
+	var errs []error
+	var userStats scimSyncStats
+	var groupStats scimSyncStats
+
+	// Sync users first, so that groups can reference them
+	if stats, err := s.syncUsers(ctx, provider, users, &userResources); err != nil {
+		errs = append(errs, err)
+		userStats = stats
+	} else {
+		userStats = stats
+	}
+
+	stats, err := s.syncGroups(ctx, provider, groups, groupResources.Resources, userResources.Resources)
+	if err != nil {
+		errs = append(errs, err)
+		groupStats = stats
+	} else {
+		groupStats = stats
+	}
+
+	if len(errs) > 0 {
+		slog.WarnContext(ctx, "SCIM sync completed with errors",
+			slog.String("provider_id", provider.ID),
+			slog.Int("error_count", len(errs)),
+			slog.Int("users_created", userStats.Created),
+			slog.Int("users_updated", userStats.Updated),
+			slog.Int("users_deleted", userStats.Deleted),
+			slog.Int("groups_created", groupStats.Created),
+			slog.Int("groups_updated", groupStats.Updated),
+			slog.Int("groups_deleted", groupStats.Deleted),
+			slog.Duration("duration", time.Since(start)),
+		)
+		return errors.Join(errs...)
+	}
+
+	provider.LastSyncedAt = utils.Ptr(datatype.DateTime(time.Now()))
+	if err := s.db.WithContext(ctx).Save(&provider).Error; err != nil {
+		return err
+	}
+
+	slog.InfoContext(ctx, "SCIM sync completed",
+		slog.String("provider_id", provider.ID),
+		slog.Int("users_created", userStats.Created),
+		slog.Int("users_updated", userStats.Updated),
+		slog.Int("users_deleted", userStats.Deleted),
+		slog.Int("groups_created", groupStats.Created),
+		slog.Int("groups_updated", groupStats.Updated),
+		slog.Int("groups_deleted", groupStats.Deleted),
+		slog.Duration("duration", time.Since(start)),
+	)
+
+	return nil
+}
+
+func (s *ScimService) syncUsers(
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	users []model.User,
+	resourceList *dto.ScimListResponse[dto.ScimUser],
+) (stats scimSyncStats, err error) {
+	var errs []error
+
+	// Update or create users
+	for _, u := range users {
+		existing := getResourceByExternalID[dto.ScimUser](u.ID, resourceList.Resources)
+
+		action, created, err := s.syncUser(ctx, provider, u, existing)
+		if created != nil && existing == nil {
+			resourceList.Resources = append(resourceList.Resources, *created)
+		}
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		// Update stats based on action taken by syncUser
+		switch action {
+		case scimActionCreated:
+			stats.Created++
+		case scimActionUpdated:
+			stats.Updated++
+		case scimActionDeleted:
+			stats.Deleted++
+		case scimActionNone:
+		}
+	}
+
+	// Delete users that are present in SCIM provider but not locally.
+	userSet := make(map[string]struct{})
+	for _, u := range users {
+		userSet[u.ID] = struct{}{}
+	}
+
+	for _, r := range resourceList.Resources {
+		if _, ok := userSet[r.ExternalID]; !ok {
+			if err := s.deleteScimResource(ctx, provider, "/Users/"+url.PathEscape(r.ID)); err != nil {
+				errs = append(errs, err)
+			} else {
+				stats.Deleted++
+			}
+		}
+	}
+
+	return stats, errors.Join(errs...)
+}
+
+func (s *ScimService) syncGroups(
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	groups []model.UserGroup,
+	remoteGroups []dto.ScimGroup,
+	userResources []dto.ScimUser,
+) (stats scimSyncStats, err error) {
+	var errs []error
+
+	// Update or create groups
+	for _, g := range groups {
+		existing := getResourceByExternalID[dto.ScimGroup](g.ID, remoteGroups)
+
+		action, err := s.syncGroup(ctx, provider, g, existing, userResources)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		// Update stats based on action taken by syncGroup
+		switch action {
+		case scimActionCreated:
+			stats.Created++
+		case scimActionUpdated:
+			stats.Updated++
+		case scimActionDeleted:
+			stats.Deleted++
+		case scimActionNone:
+		}
+
+	}
+
+	// Delete groups that are present in SCIM provider but not locally
+	groupSet := make(map[string]struct{})
+	for _, g := range groups {
+		groupSet[g.ID] = struct{}{}
+	}
+
+	for _, r := range remoteGroups {
+		if _, ok := groupSet[r.ExternalID]; !ok {
+			if err := s.deleteScimResource(ctx, provider, "/Groups/"+url.PathEscape(r.GetID())); err != nil {
+				errs = append(errs, err)
+			} else {
+				stats.Deleted++
+			}
+		}
+	}
+
+	return stats, errors.Join(errs...)
+}
+
+func (s *ScimService) syncUser(ctx context.Context,
+	provider model.ScimServiceProvider,
+	user model.User,
+	userResource *dto.ScimUser,
+) (scimSyncAction, *dto.ScimUser, error) {
+	// If user is not allowed for the client, delete it from SCIM provider
+	if userResource != nil && !IsUserGroupAllowedToAuthorize(user, provider.OidcClient) {
+		return scimActionDeleted, nil, s.deleteScimResource(ctx, provider, fmt.Sprintf("/Users/%s", url.PathEscape(userResource.ID)))
+	}
+
+	payload := dto.ScimUser{
+		ScimResourceData: dto.ScimResourceData{
+			Schemas:    []string{scimUserSchema},
+			ExternalID: user.ID,
+		},
+		UserName: user.Username,
+		Name: &dto.ScimName{
+			GivenName:  user.FirstName,
+			FamilyName: user.LastName,
+		},
+		Display: user.DisplayName,
+		Active:  !user.Disabled,
+	}
+
+	if user.Email != nil {
+		payload.Emails = []dto.ScimEmail{{
+			Value:   *user.Email,
+			Primary: true,
+		}}
+	}
+
+	// If the user exists on the SCIM provider, and it has been modified, update it
+	if userResource != nil {
+		if user.LastModified().Before(userResource.GetMeta().LastModified) {
+			return scimActionNone, nil, nil
+		}
+		path := fmt.Sprintf("/Users/%s", url.PathEscape(userResource.GetID()))
+		userResource, err := updateScimResource(s, ctx, provider, path, payload)
+		if err != nil {
+			return scimActionNone, nil, err
+		}
+		return scimActionUpdated, userResource, nil
+	}
+
+	// Otherwise, create a new SCIM user
+	userResource, err := createScimResource(s, ctx, provider, "/Users", payload)
+	if err != nil {
+		return scimActionNone, nil, err
+	}
+
+	return scimActionCreated, userResource, nil
+}
+
+func (s *ScimService) syncGroup(
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	group model.UserGroup,
+	groupResource *dto.ScimGroup,
+	userResources []dto.ScimUser,
+) (scimSyncAction, error) {
+	// If group is not allowed for the client, delete it from SCIM provider
+	if groupResource != nil && !groupAllowedForClient(group.ID, provider.OidcClient) {
+		return scimActionDeleted, s.deleteScimResource(ctx, provider, fmt.Sprintf("/Groups/%s", url.PathEscape(groupResource.GetID())))
+	}
+
+	// Prepare group members
+	members := make([]dto.ScimGroupMember, len(group.Users))
+	for i, user := range group.Users {
+		userResource := getResourceByExternalID[dto.ScimUser](user.ID, userResources)
+		if userResource == nil {
+			// Groups depend on user IDs already being provisioned
+			return scimActionNone, fmt.Errorf("cannot sync group %s: user %s is not provisioned in SCIM provider", group.ID, user.ID)
+		}
+
+		members[i] = dto.ScimGroupMember{
+			Value: userResource.GetID(),
+		}
+	}
+
+	groupPayload := dto.ScimGroup{
+		ScimResourceData: dto.ScimResourceData{
+			Schemas:    []string{scimGroupSchema},
+			ExternalID: group.ID,
+		},
+		Display: group.FriendlyName,
+		Members: members,
+	}
+
+	// If the group exists on the SCIM provider, and it has been modified, update it
+	if groupResource != nil {
+		if group.LastModified().Before(groupResource.GetMeta().LastModified) {
+			return scimActionNone, nil
+		}
+		path := fmt.Sprintf("/Groups/%s", url.PathEscape(groupResource.GetID()))
+		_, err := updateScimResource(s, ctx, provider, path, groupPayload)
+		if err != nil {
+			return scimActionNone, err
+		}
+		return scimActionUpdated, nil
+	}
+
+	// Otherwise, create a new SCIM group
+	_, err := createScimResource(s, ctx, provider, "/Groups", groupPayload)
+	if err != nil {
+		return scimActionNone, err
+	}
+
+	return scimActionCreated, nil
+}
+
+func groupAllowedForClient(groupID string, client model.OidcClient) bool {
+	if !client.IsGroupRestricted {
+		return true
+	}
+
+	for _, allowedGroup := range client.AllowedUserGroups {
+		if allowedGroup.ID == groupID {
+			return true
+		}
+	}
+
+	return false
+}
+
+func groupIDs(groups []model.UserGroup) []string {
+	ids := make([]string, len(groups))
+	for i, g := range groups {
+		ids[i] = g.ID
+	}
+	return ids
+}
+
+func (s *ScimService) groupsForClient(
+	ctx context.Context,
+	client model.OidcClient,
+	allowedGroupIDs []string,
+) ([]model.UserGroup, error) {
+	var groups []model.UserGroup
+
+	query := s.db.WithContext(ctx).Preload("Users").Model(&model.UserGroup{})
+	if client.IsGroupRestricted {
+		if len(allowedGroupIDs) == 0 {
+			return groups, nil
+		}
+		query = query.Where("id IN ?", allowedGroupIDs)
+	}
+
+	if err := query.Find(&groups).Error; err != nil {
+		return nil, err
+	}
+	return groups, nil
+}
+
+func (s *ScimService) usersForClient(
+	ctx context.Context,
+	client model.OidcClient,
+	allowedGroupIDs []string,
+) ([]model.User, error) {
+	var users []model.User
+
+	query := s.db.WithContext(ctx).Model(&model.User{})
+	if client.IsGroupRestricted {
+		if len(allowedGroupIDs) == 0 {
+			return users, nil
+		}
+		query = query.
+			Joins("JOIN user_groups_users ON users.id = user_groups_users.user_id").
+			Where("user_groups_users.user_group_id IN ?", allowedGroupIDs).
+			Select("users.*").
+			Distinct()
+	}
+
+	query = query.Preload("UserGroups")
+
+	if err := query.Find(&users).Error; err != nil {
+		return nil, err
+	}
+	return users, nil
+}
+
+func getResourceByExternalID[T dto.ScimResource](externalID string, resource []T) *T {
+	for i := range resource {
+		if resource[i].GetExternalID() == externalID {
+			return &resource[i]
+		}
+	}
+	return nil
+}
+
+func listScimResources[T any](
+	s *ScimService,
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	path string,
+) (result dto.ScimListResponse[T], err error) {
+	startIndex := 1
+	count := 1000
+
+	for {
+		// Use SCIM pagination to avoid missing resources on large providers
+		queryParams := map[string]string{
+			"startIndex": strconv.Itoa(startIndex),
+			"count":      strconv.Itoa(count),
+		}
+
+		resp, err := s.scimRequest(ctx, provider, http.MethodGet, path, nil, queryParams)
+		if err != nil {
+			return dto.ScimListResponse[T]{}, err
+		}
+
+		if err := ensureScimStatus(ctx, resp, provider, http.StatusOK); err != nil {
+			return dto.ScimListResponse[T]{}, err
+		}
+
+		var page dto.ScimListResponse[T]
+		if err := json.NewDecoder(resp.Body).Decode(&page); err != nil {
+			return dto.ScimListResponse[T]{}, fmt.Errorf("failed to decode SCIM list response: %w", err)
+		}
+
+		resp.Body.Close()
+
+		// Initialize metadata only once
+		if result.TotalResults == 0 {
+			result.TotalResults = page.TotalResults
+		}
+
+		result.Resources = append(result.Resources, page.Resources...)
+
+		// If we've fetched everything, stop
+		if len(result.Resources) >= page.TotalResults || len(page.Resources) == 0 {
+			break
+		}
+
+		startIndex += page.ItemsPerPage
+	}
+
+	result.ItemsPerPage = len(result.Resources)
+	return result, nil
+}
+
+func createScimResource[T dto.ScimResource](
+	s *ScimService,
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	path string, payload T) (*T, error) {
+	resp, err := s.scimRequest(ctx, provider, http.MethodPost, path, payload, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if err := ensureScimStatus(ctx, resp, provider, http.StatusOK, http.StatusCreated); err != nil {
+		return nil, err
+	}
+
+	var resource T
+	if err := json.NewDecoder(resp.Body).Decode(&resource); err != nil {
+		return nil, fmt.Errorf("failed to decode SCIM create response: %w", err)
+	}
+
+	return &resource, nil
+}
+
+func updateScimResource[T dto.ScimResource](
+	s *ScimService,
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	path string,
+	payload T,
+) (*T, error) {
+	resp, err := s.scimRequest(ctx, provider, http.MethodPut, path, payload, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if err := ensureScimStatus(ctx, resp, provider, http.StatusOK, http.StatusCreated); err != nil {
+		return nil, err
+	}
+
+	var resource T
+	if err := json.NewDecoder(resp.Body).Decode(&resource); err != nil {
+		return nil, fmt.Errorf("failed to decode SCIM update response: %w", err)
+	}
+
+	return &resource, nil
+}
+
+func (s *ScimService) deleteScimResource(ctx context.Context, provider model.ScimServiceProvider, path string) error {
+	resp, err := s.scimRequest(ctx, provider, http.MethodDelete, path, nil, nil)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound {
+		return nil
+	}
+
+	return ensureScimStatus(ctx, resp, provider, http.StatusOK, http.StatusNoContent)
+}
+
+func (s *ScimService) scimRequest(
+	ctx context.Context,
+	provider model.ScimServiceProvider,
+	method,
+	path string,
+	payload any,
+	queryParams map[string]string,
+) (*http.Response, error) {
+	urlString, err := scimURL(provider.Endpoint, path, queryParams)
+	if err != nil {
+		return nil, err
+	}
+
+	var bodyBytes []byte
+	if payload != nil {
+		encoded, err := json.Marshal(payload)
+		if err != nil {
+			return nil, fmt.Errorf("failed to encode SCIM payload: %w", err)
+		}
+		bodyBytes = encoded
+	}
+
+	retryAttempts := 3
+	for attempt := 1; attempt <= retryAttempts; attempt++ {
+		var body io.Reader
+		if bodyBytes != nil {
+			body = bytes.NewReader(bodyBytes)
+		}
+
+		req, err := http.NewRequestWithContext(ctx, method, urlString, body)
+		if err != nil {
+			return nil, err
+		}
+
+		req.Header.Set("Accept", scimContentType)
+		if payload != nil {
+			req.Header.Set("Content-Type", scimContentType)
+		}
+		token := string(provider.Token)
+		if token != "" {
+			req.Header.Set("Authorization", "Bearer "+token)
+		}
+
+		slog.Debug("Sending SCIM request",
+			slog.String("method", method),
+			slog.String("url", urlString),
+			slog.String("provider_id", provider.ID),
+		)
+
+		resp, err := s.httpClient.Do(req)
+		if err != nil {
+			return nil, err
+		}
+
+		// Only retry on 429 to avoid masking other errors
+		if resp.StatusCode != http.StatusTooManyRequests || attempt == retryAttempts {
+			return resp, nil
+		}
+
+		retryDelay := scimRetryDelay(resp.Header.Get("Retry-After"), attempt)
+		slog.WarnContext(ctx, "SCIM provider rate-limited, retrying",
+			slog.String("provider_id", provider.ID),
+			slog.String("method", method),
+			slog.String("url", urlString),
+			slog.Int("attempt", attempt),
+			slog.Duration("retry_after", retryDelay),
+		)
+
+		resp.Body.Close()
+		if err := utils.SleepWithContext(ctx, retryDelay); err != nil {
+			return nil, err
+		}
+	}
+
+	return nil, fmt.Errorf("scim request retry attempts exceeded")
+}
+
+func scimRetryDelay(retryAfter string, attempt int) time.Duration {
+	// Respect Retry-After when provided
+	if retryAfter != "" {
+		if seconds, err := strconv.Atoi(retryAfter); err == nil {
+			return time.Duration(seconds) * time.Second
+		}
+		if t, err := http.ParseTime(retryAfter); err == nil {
+			if delay := time.Until(t); delay > 0 {
+				return delay
+			}
+		}
+	}
+
+	// Exponential backoff otherwise
+	maxDelay := 10 * time.Second
+	delay := 500 * time.Millisecond * (time.Duration(1) << (attempt - 1)) //nolint:gosec // attempt is bounded 1-3
+	if delay > maxDelay {
+		return maxDelay
+	}
+	return delay
+}
+
+func scimURL(endpoint, p string, queryParams map[string]string) (string, error) {
+	u, err := url.Parse(endpoint)
+	if err != nil {
+		return "", fmt.Errorf("invalid scim endpoint: %w", err)
+	}
+
+	u.Path = path.Join(strings.TrimRight(u.Path, "/"), p)
+
+	q := u.Query()
+	for key, value := range queryParams {
+		q.Set(key, value)
+	}
+	u.RawQuery = q.Encode()
+
+	return u.String(), nil
+}
+
+func ensureScimStatus(
+	ctx context.Context,
+	resp *http.Response,
+	provider model.ScimServiceProvider,
+	allowedStatuses ...int) error {
+	for _, status := range allowedStatuses {
+		if resp.StatusCode == status {
+			return nil
+		}
+	}
+
+	body := readScimErrorBody(resp.Body)
+
+	slog.ErrorContext(ctx, "SCIM request failed",
+		slog.String("provider_id", provider.ID),
+		slog.String("method", resp.Request.Method),
+		slog.String("url", resp.Request.URL.String()),
+		slog.Int("status", resp.StatusCode),
+		slog.String("response_body", body),
+	)
+
+	return fmt.Errorf("scim request failed with status %d: %s", resp.StatusCode, body)
+}
+
+func readScimErrorBody(body io.Reader) string {
+	payload, err := io.ReadAll(io.LimitReader(body, scimErrorBodyLimit))
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(string(payload))
+}
--- a/backend/internal/service/user_group_service.go
+++ b/backend/internal/service/user_group_service.go
@@ -3,7 +3,9 @@ package service
 import (
 	"context"
 	"errors"
+	"time"

+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
 	"gorm.io/gorm"

 	"github.com/pocket-id/pocket-id/backend/internal/common"
@@ -53,6 +55,7 @@ func (s *UserGroupService) getInternal(ctx context.Context, id string, tx *gorm.
 		Where("id = ?", id).
 		Preload("CustomClaims").
 		Preload("Users").
+		Preload("AllowedOidcClients").
 		First(&group).
 		Error
 	return group, err
@@ -150,6 +153,7 @@ func (s *UserGroupService) updateInternal(ctx context.Context, id string, input

 	group.Name = input.Name
 	group.FriendlyName = input.FriendlyName
+	group.UpdatedAt = utils.Ptr(datatype.DateTime(time.Now()))

 	err = tx.
 		WithContext(ctx).
@@ -213,6 +217,8 @@ func (s *UserGroupService) updateUsersInternal(ctx context.Context, id string, u
 	}

 	// Save the updated group
+	group.UpdatedAt = utils.Ptr(datatype.DateTime(time.Now()))
+
 	err = tx.
 		WithContext(ctx).
 		Save(&group).
@@ -248,3 +254,54 @@ func (s *UserGroupService) GetUserCountOfGroup(ctx context.Context, id string) (
 		Count()
 	return count, nil
 }
+
+func (s *UserGroupService) UpdateAllowedOidcClient(ctx context.Context, id string, input dto.UserGroupUpdateAllowedOidcClientsDto) (group model.UserGroup, err error) {
+	tx := s.db.Begin()
+	defer func() {
+		tx.Rollback()
+	}()
+
+	group, err = s.getInternal(ctx, id, tx)
+	if err != nil {
+		return model.UserGroup{}, err
+	}
+
+	// Fetch the clients based on the client IDs
+	var clients []model.OidcClient
+	if len(input.OidcClientIDs) > 0 {
+		err = tx.
+			WithContext(ctx).
+			Where("id IN (?)", input.OidcClientIDs).
+			Find(&clients).
+			Error
+		if err != nil {
+			return model.UserGroup{}, err
+		}
+	}
+
+	// Replace the current clients with the new set of clients
+	err = tx.
+		WithContext(ctx).
+		Model(&group).
+		Association("AllowedOidcClients").
+		Replace(clients)
+	if err != nil {
+		return model.UserGroup{}, err
+	}
+
+	// Save the updated group
+	err = tx.
+		WithContext(ctx).
+		Save(&group).
+		Error
+	if err != nil {
+		return model.UserGroup{}, err
+	}
+
+	err = tx.Commit().Error
+	if err != nil {
+		return model.UserGroup{}, err
+	}
+
+	return group, nil
+}
--- a/backend/internal/service/user_service.go
+++ b/backend/internal/service/user_service.go
@@ -17,6 +17,7 @@ import (
 	"github.com/google/uuid"
 	"go.opentelemetry.io/otel/trace"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"

 	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/dto"
@@ -101,9 +102,10 @@ func (s *UserService) GetProfilePicture(ctx context.Context, userID string) (io.
 	profilePicturePath := path.Join("profile-pictures", userID+".png")

 	// Try custom profile picture
-	if file, size, err := s.fileStorage.Open(ctx, profilePicturePath); err == nil {
+	file, size, err := s.fileStorage.Open(ctx, profilePicturePath)
+	if err == nil {
 		return file, size, nil
-	} else if err != nil && !errors.Is(err, fs.ErrNotExist) {
+	} else if !errors.Is(err, fs.ErrNotExist) {
 		return nil, 0, err
 	}

@@ -120,9 +122,10 @@ func (s *UserService) GetProfilePicture(ctx context.Context, userID string) (io.

 	// Try cached default for initials
 	defaultPicturePath := path.Join("profile-pictures", "defaults", user.Initials()+".png")
-	if file, size, err := s.fileStorage.Open(ctx, defaultPicturePath); err == nil {
+	file, size, err = s.fileStorage.Open(ctx, defaultPicturePath)
+	if err == nil {
 		return file, size, nil
-	} else if err != nil && !errors.Is(err, fs.ErrNotExist) {
+	} else if !errors.Is(err, fs.ErrNotExist) {
 		return nil, 0, err
 	}

@@ -133,12 +136,13 @@ func (s *UserService) GetProfilePicture(ctx context.Context, userID string) (io.
 	}

 	// Save the default picture for future use (in a goroutine to avoid blocking)
-	//nolint:contextcheck
 	defaultPictureBytes := defaultPicture.Bytes()
 	//nolint:contextcheck
 	go func() {
-		if err := s.fileStorage.Save(context.Background(), defaultPicturePath, bytes.NewReader(defaultPictureBytes)); err != nil {
-			slog.Error("Failed to cache default profile picture", slog.String("initials", user.Initials()), slog.Any("error", err))
+		// Use bytes.NewReader because we need an io.ReadSeeker
+		rErr := s.fileStorage.Save(context.Background(), defaultPicturePath, bytes.NewReader(defaultPictureBytes))
+		if rErr != nil {
+			slog.Error("Failed to cache default profile picture", slog.String("initials", user.Initials()), slog.Any("error", rErr))
 		}
 	}()

@@ -159,7 +163,7 @@ func (s *UserService) GetUserGroups(ctx context.Context, userID string) ([]model
 	return user.UserGroups, nil
 }

-func (s *UserService) UpdateProfilePicture(ctx context.Context, userID string, file io.Reader) error {
+func (s *UserService) UpdateProfilePicture(ctx context.Context, userID string, file io.ReadSeeker) error {
 	// Validate the user ID to prevent directory traversal
 	err := uuid.Validate(userID)
 	if err != nil {
@@ -182,17 +186,30 @@ func (s *UserService) UpdateProfilePicture(ctx context.Context, userID string, f
 }

 func (s *UserService) DeleteUser(ctx context.Context, userID string, allowLdapDelete bool) error {
-	return s.db.Transaction(func(tx *gorm.DB) error {
-		return s.deleteUserInternal(ctx, userID, allowLdapDelete, tx)
+	err := s.db.Transaction(func(tx *gorm.DB) error {
+		return s.deleteUserInternal(ctx, tx, userID, allowLdapDelete)
 	})
+	if err != nil {
+		return fmt.Errorf("failed to delete user '%s': %w", userID, err)
+	}
+
+	// Storage operations must be executed outside of a transaction
+	profilePicturePath := path.Join("profile-pictures", userID+".png")
+	err = s.fileStorage.Delete(ctx, profilePicturePath)
+	if err != nil && !storage.IsNotExist(err) {
+		return fmt.Errorf("failed to delete profile picture for user '%s': %w", userID, err)
+	}
+
+	return nil
 }

-func (s *UserService) deleteUserInternal(ctx context.Context, userID string, allowLdapDelete bool, tx *gorm.DB) error {
+func (s *UserService) deleteUserInternal(ctx context.Context, tx *gorm.DB, userID string, allowLdapDelete bool) error {
 	var user model.User

 	err := tx.
 		WithContext(ctx).
 		Where("id = ?", userID).
+		Clauses(clause.Locking{Strength: "UPDATE"}).
 		First(&user).
 		Error
 	if err != nil {
@@ -204,11 +221,6 @@ func (s *UserService) deleteUserInternal(ctx context.Context, userID string, all
 		return &common.LdapUserUpdateError{}
 	}

-	profilePicturePath := path.Join("profile-pictures", userID+".png")
-	if err := s.fileStorage.Delete(ctx, profilePicturePath); err != nil {
-		return err
-	}
-
 	err = tx.WithContext(ctx).Delete(&user).Error
 	if err != nil {
 		return fmt.Errorf("failed to delete user: %w", err)
@@ -241,6 +253,18 @@ func (s *UserService) createUserInternal(ctx context.Context, input dto.UserCrea
 		return model.User{}, &common.UserEmailNotSetError{}
 	}

+	var userGroups []model.UserGroup
+	if len(input.UserGroupIds) > 0 {
+		err := tx.
+			WithContext(ctx).
+			Where("id IN ?", input.UserGroupIds).
+			Find(&userGroups).
+			Error
+		if err != nil {
+			return model.User{}, err
+		}
+	}
+
 	user := model.User{
 		FirstName:   input.FirstName,
 		LastName:    input.LastName,
@@ -250,6 +274,7 @@ func (s *UserService) createUserInternal(ctx context.Context, input dto.UserCrea
 		IsAdmin:     input.IsAdmin,
 		Locale:      input.Locale,
 		Disabled:    input.Disabled,
+		UserGroups:  userGroups,
 	}
 	if input.LdapID != "" {
 		user.LdapID = &input.LdapID
@@ -273,7 +298,13 @@ func (s *UserService) createUserInternal(ctx context.Context, input dto.UserCrea

 	// Apply default groups and claims for new non-LDAP users
 	if !isLdapSync {
-		if err := s.applySignupDefaults(ctx, &user, tx); err != nil {
+		if len(input.UserGroupIds) == 0 {
+			if err := s.applyDefaultGroups(ctx, &user, tx); err != nil {
+				return model.User{}, err
+			}
+		}
+
+		if err := s.applyDefaultCustomClaims(ctx, &user, tx); err != nil {
 			return model.User{}, err
 		}
 	}
@@ -281,34 +312,51 @@ func (s *UserService) createUserInternal(ctx context.Context, input dto.UserCrea
 	return user, nil
 }

-func (s *UserService) applySignupDefaults(ctx context.Context, user *model.User, tx *gorm.DB) error {
+func (s *UserService) applyDefaultGroups(ctx context.Context, user *model.User, tx *gorm.DB) error {
 	config := s.appConfigService.GetDbConfig()

-	// Apply default user groups
 	var groupIDs []string
-	if v := config.SignupDefaultUserGroupIDs.Value; v != "" && v != "[]" {
-		if err := json.Unmarshal([]byte(v), &groupIDs); err != nil {
+	v := config.SignupDefaultUserGroupIDs.Value
+	if v != "" && v != "[]" {
+		err := json.Unmarshal([]byte(v), &groupIDs)
+		if err != nil {
 			return fmt.Errorf("invalid SignupDefaultUserGroupIDs JSON: %w", err)
 		}
 		if len(groupIDs) > 0 {
 			var groups []model.UserGroup
-			if err := tx.WithContext(ctx).Where("id IN ?", groupIDs).Find(&groups).Error; err != nil {
+			err = tx.WithContext(ctx).
+				Where("id IN ?", groupIDs).
+				Find(&groups).
+				Error
+			if err != nil {
 				return fmt.Errorf("failed to find default user groups: %w", err)
 			}
-			if err := tx.WithContext(ctx).Model(user).Association("UserGroups").Replace(groups); err != nil {
+
+			err = tx.WithContext(ctx).
+				Model(user).
+				Association("UserGroups").
+				Replace(groups)
+			if err != nil {
 				return fmt.Errorf("failed to associate default user groups: %w", err)
 			}
 		}
 	}
+	return nil
+}
+
+func (s *UserService) applyDefaultCustomClaims(ctx context.Context, user *model.User, tx *gorm.DB) error {
+	config := s.appConfigService.GetDbConfig()

-	// Apply default custom claims
 	var claims []dto.CustomClaimCreateDto
-	if v := config.SignupDefaultCustomClaims.Value; v != "" && v != "[]" {
-		if err := json.Unmarshal([]byte(v), &claims); err != nil {
+	v := config.SignupDefaultCustomClaims.Value
+	if v != "" && v != "[]" {
+		err := json.Unmarshal([]byte(v), &claims)
+		if err != nil {
 			return fmt.Errorf("invalid SignupDefaultCustomClaims JSON: %w", err)
 		}
 		if len(claims) > 0 {
-			if _, err := s.customClaimService.updateCustomClaimsInternal(ctx, UserID, user.ID, claims, tx); err != nil {
+			_, err = s.customClaimService.updateCustomClaimsInternal(ctx, UserID, user.ID, claims, tx)
+			if err != nil {
 				return fmt.Errorf("failed to apply default custom claims: %w", err)
 			}
 		}
@@ -345,6 +393,7 @@ func (s *UserService) updateUserInternal(ctx context.Context, userID string, upd
 	err := tx.
 		WithContext(ctx).
 		Where("id = ?", userID).
+		Clauses(clause.Locking{Strength: "UPDATE"}).
 		First(&user).
 		Error
 	if err != nil {
@@ -377,6 +426,8 @@ func (s *UserService) updateUserInternal(ctx context.Context, userID string, upd
 		}
 	}

+	user.UpdatedAt = utils.Ptr(datatype.DateTime(time.Now()))
+
 	err = tx.
 		WithContext(ctx).
 		Save(&user).
@@ -405,30 +456,36 @@ func (s *UserService) RequestOneTimeAccessEmailAsAdmin(ctx context.Context, user
 		return &common.OneTimeAccessDisabledError{}
 	}

-	return s.requestOneTimeAccessEmailInternal(ctx, userID, "", ttl)
+	_, err := s.requestOneTimeAccessEmailInternal(ctx, userID, "", ttl, true)
+	return err
 }

-func (s *UserService) RequestOneTimeAccessEmailAsUnauthenticatedUser(ctx context.Context, userID, redirectPath string) error {
+func (s *UserService) RequestOneTimeAccessEmailAsUnauthenticatedUser(ctx context.Context, userID, redirectPath string) (string, error) {
 	isDisabled := !s.appConfigService.GetDbConfig().EmailOneTimeAccessAsUnauthenticatedEnabled.IsTrue()
 	if isDisabled {
-		return &common.OneTimeAccessDisabledError{}
+		return "", &common.OneTimeAccessDisabledError{}
 	}

 	var userId string
 	err := s.db.Model(&model.User{}).Select("id").Where("email = ?", userID).First(&userId).Error
-	if err != nil {
+	if errors.Is(err, gorm.ErrRecordNotFound) {
 		// Do not return error if user not found to prevent email enumeration
-		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return nil
-		} else {
-			return err
-		}
+		return "", nil
+	} else if err != nil {
+		return "", err
 	}

-	return s.requestOneTimeAccessEmailInternal(ctx, userId, redirectPath, 15*time.Minute)
+	deviceToken, err := s.requestOneTimeAccessEmailInternal(ctx, userId, redirectPath, 15*time.Minute, true)
+	if err != nil {
+		return "", err
+	} else if deviceToken == nil {
+		return "", errors.New("device token expected but not returned")
+	}
+
+	return *deviceToken, nil
 }

-func (s *UserService) requestOneTimeAccessEmailInternal(ctx context.Context, userID, redirectPath string, ttl time.Duration) error {
+func (s *UserService) requestOneTimeAccessEmailInternal(ctx context.Context, userID, redirectPath string, ttl time.Duration, withDeviceToken bool) (*string, error) {
 	tx := s.db.Begin()
 	defer func() {
 		tx.Rollback()
@@ -436,21 +493,20 @@ func (s *UserService) requestOneTimeAccessEmailInternal(ctx context.Context, use

 	user, err := s.GetUser(ctx, userID)
 	if err != nil {
-		return err
+		return nil, err
 	}

 	if user.Email == nil {
-		return &common.UserEmailNotSetError{}
+		return nil, &common.UserEmailNotSetError{}
 	}

-	oneTimeAccessToken, err := s.createOneTimeAccessTokenInternal(ctx, user.ID, ttl, tx)
+	oneTimeAccessToken, deviceToken, err := s.createOneTimeAccessTokenInternal(ctx, user.ID, ttl, withDeviceToken, tx)
 	if err != nil {
-		return err
+		return nil, err
 	}
-
 	err = tx.Commit().Error
 	if err != nil {
-		return err
+		return nil, err
 	}

 	// We use a background context here as this is running in a goroutine
@@ -483,28 +539,29 @@ func (s *UserService) requestOneTimeAccessEmailInternal(ctx context.Context, use
 		}
 	}()

-	return nil
+	return deviceToken, nil
 }

-func (s *UserService) CreateOneTimeAccessToken(ctx context.Context, userID string, ttl time.Duration) (string, error) {
-	return s.createOneTimeAccessTokenInternal(ctx, userID, ttl, s.db)
+func (s *UserService) CreateOneTimeAccessToken(ctx context.Context, userID string, ttl time.Duration) (token string, err error) {
+	token, _, err = s.createOneTimeAccessTokenInternal(ctx, userID, ttl, false, s.db)
+	return token, err
 }

-func (s *UserService) createOneTimeAccessTokenInternal(ctx context.Context, userID string, ttl time.Duration, tx *gorm.DB) (string, error) {
-	oneTimeAccessToken, err := NewOneTimeAccessToken(userID, ttl)
+func (s *UserService) createOneTimeAccessTokenInternal(ctx context.Context, userID string, ttl time.Duration, withDeviceToken bool, tx *gorm.DB) (token string, deviceToken *string, err error) {
+	oneTimeAccessToken, err := NewOneTimeAccessToken(userID, ttl, withDeviceToken)
 	if err != nil {
-		return "", err
+		return "", nil, err
 	}

 	err = tx.WithContext(ctx).Create(oneTimeAccessToken).Error
 	if err != nil {
-		return "", err
+		return "", nil, err
 	}

-	return oneTimeAccessToken.Token, nil
+	return oneTimeAccessToken.Token, oneTimeAccessToken.DeviceToken, nil
 }

-func (s *UserService) ExchangeOneTimeAccessToken(ctx context.Context, token string, ipAddress, userAgent string) (model.User, string, error) {
+func (s *UserService) ExchangeOneTimeAccessToken(ctx context.Context, token, deviceToken, ipAddress, userAgent string) (model.User, string, error) {
 	tx := s.db.Begin()
 	defer func() {
 		tx.Rollback()
@@ -513,7 +570,9 @@ func (s *UserService) ExchangeOneTimeAccessToken(ctx context.Context, token stri
 	var oneTimeAccessToken model.OneTimeAccessToken
 	err := tx.
 		WithContext(ctx).
-		Where("token = ? AND expires_at > ?", token, datatype.DateTime(time.Now())).Preload("User").
+		Where("token = ? AND expires_at > ?", token, datatype.DateTime(time.Now())).
+		Preload("User").
+		Clauses(clause.Locking{Strength: "UPDATE"}).
 		First(&oneTimeAccessToken).
 		Error
 	if err != nil {
@@ -522,6 +581,10 @@ func (s *UserService) ExchangeOneTimeAccessToken(ctx context.Context, token stri
 		}
 		return model.User{}, "", err
 	}
+	if oneTimeAccessToken.DeviceToken != nil && deviceToken != *oneTimeAccessToken.DeviceToken {
+		return model.User{}, "", &common.DeviceCodeInvalid{}
+	}
+
 	accessToken, err := s.jwtService.GenerateAccessToken(oneTimeAccessToken.User)
 	if err != nil {
 		return model.User{}, "", err
@@ -585,6 +648,16 @@ func (s *UserService) UpdateUserGroups(ctx context.Context, id string, userGroup
 		return model.User{}, err
 	}

+	// Update the UpdatedAt field for all affected groups
+	now := time.Now()
+	for _, group := range groups {
+		group.UpdatedAt = utils.Ptr(datatype.DateTime(now))
+		err = tx.WithContext(ctx).Save(&group).Error
+		if err != nil {
+			return model.User{}, err
+		}
+	}
+
 	err = tx.Commit().Error
 	if err != nil {
 		return model.User{}, err
@@ -679,7 +752,7 @@ func (s *UserService) ResetProfilePicture(ctx context.Context, userID string) er
 	return nil
 }

-func (s *UserService) disableUserInternal(ctx context.Context, userID string, tx *gorm.DB) error {
+func (s *UserService) disableUserInternal(ctx context.Context, tx *gorm.DB, userID string) error {
 	return tx.
 		WithContext(ctx).
 		Model(&model.User{}).
@@ -688,12 +761,22 @@ func (s *UserService) disableUserInternal(ctx context.Context, userID string, tx
 		Error
 }

-func (s *UserService) CreateSignupToken(ctx context.Context, ttl time.Duration, usageLimit int) (model.SignupToken, error) {
+func (s *UserService) CreateSignupToken(ctx context.Context, ttl time.Duration, usageLimit int, userGroupIDs []string) (model.SignupToken, error) {
 	signupToken, err := NewSignupToken(ttl, usageLimit)
 	if err != nil {
 		return model.SignupToken{}, err
 	}

+	var userGroups []model.UserGroup
+	err = s.db.WithContext(ctx).
+		Where("id IN ?", userGroupIDs).
+		Find(&userGroups).
+		Error
+	if err != nil {
+		return model.SignupToken{}, err
+	}
+	signupToken.UserGroups = userGroups
+
 	err = s.db.WithContext(ctx).Create(signupToken).Error
 	if err != nil {
 		return model.SignupToken{}, err
@@ -716,10 +799,13 @@ func (s *UserService) SignUp(ctx context.Context, signupData dto.SignUpDto, ipAd
 	}

 	var signupToken model.SignupToken
+	var userGroupIDs []string
 	if tokenProvided {
 		err := tx.
 			WithContext(ctx).
+			Preload("UserGroups").
 			Where("token = ?", signupData.Token).
+			Clauses(clause.Locking{Strength: "UPDATE"}).
 			First(&signupToken).
 			Error
 		if err != nil {
@@ -732,14 +818,19 @@ func (s *UserService) SignUp(ctx context.Context, signupData dto.SignUpDto, ipAd
 		if !signupToken.IsValid() {
 			return model.User{}, "", &common.TokenInvalidOrExpiredError{}
 		}
+
+		for _, group := range signupToken.UserGroups {
+			userGroupIDs = append(userGroupIDs, group.ID)
+		}
 	}

 	userToCreate := dto.UserCreateDto{
-		Username:    signupData.Username,
-		Email:       signupData.Email,
-		FirstName:   signupData.FirstName,
-		LastName:    signupData.LastName,
-		DisplayName: strings.TrimSpace(signupData.FirstName + " " + signupData.LastName),
+		Username:     signupData.Username,
+		Email:        signupData.Email,
+		FirstName:    signupData.FirstName,
+		LastName:     signupData.LastName,
+		DisplayName:  strings.TrimSpace(signupData.FirstName + " " + signupData.LastName),
+		UserGroupIds: userGroupIDs,
 	}

 	user, err := s.createUserInternal(ctx, userToCreate, false, tx)
@@ -780,7 +871,7 @@ func (s *UserService) SignUp(ctx context.Context, signupData dto.SignUpDto, ipAd

 func (s *UserService) ListSignupTokens(ctx context.Context, listRequestOptions utils.ListRequestOptions) ([]model.SignupToken, utils.PaginationResponse, error) {
 	var tokens []model.SignupToken
-	query := s.db.WithContext(ctx).Model(&model.SignupToken{})
+	query := s.db.WithContext(ctx).Preload("UserGroups").Model(&model.SignupToken{})

 	pagination, err := utils.PaginateFilterAndSort(listRequestOptions, query, &tokens)
 	return tokens, pagination, err
@@ -790,23 +881,33 @@ func (s *UserService) DeleteSignupToken(ctx context.Context, tokenID string) err
 	return s.db.WithContext(ctx).Delete(&model.SignupToken{}, "id = ?", tokenID).Error
 }

-func NewOneTimeAccessToken(userID string, ttl time.Duration) (*model.OneTimeAccessToken, error) {
+func NewOneTimeAccessToken(userID string, ttl time.Duration, withDeviceToken bool) (*model.OneTimeAccessToken, error) {
 	// If expires at is less than 15 minutes, use a 6-character token instead of 16
 	tokenLength := 16
 	if ttl <= 15*time.Minute {
 		tokenLength = 6
 	}

-	randomString, err := utils.GenerateRandomAlphanumericString(tokenLength)
+	token, err := utils.GenerateRandomUnambiguousString(tokenLength)
 	if err != nil {
 		return nil, err
 	}

+	var deviceToken *string
+	if withDeviceToken {
+		dt, err := utils.GenerateRandomAlphanumericString(16)
+		if err != nil {
+			return nil, err
+		}
+		deviceToken = &dt
+	}
+
 	now := time.Now().Round(time.Second)
 	o := &model.OneTimeAccessToken{
-		UserID:    userID,
-		ExpiresAt: datatype.DateTime(now.Add(ttl)),
-		Token:     randomString,
+		UserID:      userID,
+		ExpiresAt:   datatype.DateTime(now.Add(ttl)),
+		Token:       token,
+		DeviceToken: deviceToken,
 	}

 	return o, nil
--- a/backend/internal/service/version_service.go
+++ b/backend/internal/service/version_service.go
@@ -58,7 +58,7 @@ func (s *VersionService) GetLatestVersion(ctx context.Context) (string, error) {
 		}

 		if payload.TagName == "" {
-			return "", fmt.Errorf("GitHub API returned empty tag name")
+			return "", errors.New("GitHub API returned empty tag name")
 		}

 		return strings.TrimPrefix(payload.TagName, "v"), nil
--- a/backend/internal/service/webauthn_service.go
+++ b/backend/internal/service/webauthn_service.go
@@ -2,6 +2,8 @@ package service

 import (
 	"context"
+	"encoding/hex"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
@@ -114,7 +116,7 @@ func (s *WebAuthnService) BeginRegistration(ctx context.Context, userID string)
 	}, nil
 }

-func (s *WebAuthnService) VerifyRegistration(ctx context.Context, sessionID, userID string, r *http.Request) (model.WebauthnCredential, error) {
+func (s *WebAuthnService) VerifyRegistration(ctx context.Context, sessionID string, userID string, r *http.Request, ipAddress string) (model.WebauthnCredential, error) {
 	tx := s.db.Begin()
 	defer func() {
 		tx.Rollback()
@@ -173,6 +175,9 @@ func (s *WebAuthnService) VerifyRegistration(ctx context.Context, sessionID, use
 		return model.WebauthnCredential{}, fmt.Errorf("failed to store WebAuthn credential: %w", err)
 	}

+	auditLogData := model.AuditLogData{"credentialID": hex.EncodeToString(credential.ID), "passkeyName": passkeyName}
+	s.auditLogService.Create(ctx, model.AuditLogEventPasskeyAdded, ipAddress, r.UserAgent(), userID, auditLogData, tx)
+
 	err = tx.Commit().Error
 	if err != nil {
 		return model.WebauthnCredential{}, fmt.Errorf("failed to commit transaction: %w", err)
@@ -288,16 +293,30 @@ func (s *WebAuthnService) ListCredentials(ctx context.Context, userID string) ([
 	return credentials, nil
 }

-func (s *WebAuthnService) DeleteCredential(ctx context.Context, userID, credentialID string) error {
-	err := s.db.
+func (s *WebAuthnService) DeleteCredential(ctx context.Context, userID string, credentialID string, ipAddress string, userAgent string) error {
+	tx := s.db.Begin()
+	defer func() {
+		tx.Rollback()
+	}()
+
+	credential := &model.WebauthnCredential{}
+	err := tx.
 		WithContext(ctx).
-		Where("id = ? AND user_id = ?", credentialID, userID).
-		Delete(&model.WebauthnCredential{}).
+		Clauses(clause.Returning{}).
+		Delete(credential, "id = ? AND user_id = ?", credentialID, userID).
 		Error
 	if err != nil {
 		return fmt.Errorf("failed to delete record: %w", err)
 	}

+	auditLogData := model.AuditLogData{"credentialID": hex.EncodeToString(credential.CredentialID), "passkeyName": credential.Name}
+	s.auditLogService.Create(ctx, model.AuditLogEventPasskeyRemoved, ipAddress, userAgent, userID, auditLogData, tx)
+
+	err = tx.Commit().Error
+	if err != nil {
+		return fmt.Errorf("failed to commit transaction: %w", err)
+	}
+
 	return nil
 }

@@ -353,7 +372,7 @@ func (s *WebAuthnService) CreateReauthenticationTokenWithAccessToken(ctx context

 	userID, ok := token.Subject()
 	if !ok {
-		return "", fmt.Errorf("access token does not contain user ID")
+		return "", errors.New("access token does not contain user ID")
 	}

 	// Check if token is issued less than a minute ago
--- a/backend/internal/storage/database.go
+++ b/backend/internal/storage/database.go
@@ -0,0 +1,226 @@
+package storage
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/pocket-id/pocket-id/backend/internal/model"
+	datatype "github.com/pocket-id/pocket-id/backend/internal/model/types"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+var TypeDatabase = "database"
+
+type databaseStorage struct {
+	db *gorm.DB
+}
+
+// NewDatabaseStorage creates a new database storage provider
+func NewDatabaseStorage(db *gorm.DB) (FileStorage, error) {
+	if db == nil {
+		return nil, errors.New("database connection is required")
+	}
+	return &databaseStorage{db: db}, nil
+}
+
+func (s *databaseStorage) Type() string {
+	return TypeDatabase
+}
+
+func (s *databaseStorage) Save(ctx context.Context, relativePath string, data io.Reader) error {
+	// Normalize the path
+	relativePath = filepath.ToSlash(filepath.Clean(relativePath))
+
+	// Read all data into memory
+	b, err := io.ReadAll(data)
+	if err != nil {
+		return fmt.Errorf("failed to read data: %w", err)
+	}
+
+	now := datatype.DateTime(time.Now())
+	storage := model.Storage{
+		Path:      relativePath,
+		Data:      b,
+		Size:      int64(len(b)),
+		ModTime:   now,
+		CreatedAt: now,
+	}
+
+	// Use upsert: insert or update on conflict
+	result := s.db.
+		WithContext(ctx).
+		Clauses(clause.OnConflict{
+			Columns:   []clause.Column{{Name: "path"}},
+			DoUpdates: clause.AssignmentColumns([]string{"data", "size", "mod_time"}),
+		}).
+		Create(&storage)
+
+	if result.Error != nil {
+		return fmt.Errorf("failed to save file to database: %w", result.Error)
+	}
+
+	return nil
+}
+
+func (s *databaseStorage) Open(ctx context.Context, relativePath string) (io.ReadCloser, int64, error) {
+	relativePath = filepath.ToSlash(filepath.Clean(relativePath))
+
+	var storage model.Storage
+	result := s.db.
+		WithContext(ctx).
+		Where("path = ?", relativePath).
+		First(&storage)
+
+	if result.Error != nil {
+		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
+			return nil, 0, os.ErrNotExist
+		}
+		return nil, 0, fmt.Errorf("failed to read file from database: %w", result.Error)
+	}
+
+	reader := io.NopCloser(bytes.NewReader(storage.Data))
+	return reader, storage.Size, nil
+}
+
+func (s *databaseStorage) Delete(ctx context.Context, relativePath string) error {
+	relativePath = filepath.ToSlash(filepath.Clean(relativePath))
+
+	result := s.db.
+		WithContext(ctx).
+		Where("path = ?", relativePath).
+		Delete(&model.Storage{})
+	if result.Error != nil {
+		return fmt.Errorf("failed to delete file from database: %w", result.Error)
+	}
+
+	return nil
+}
+
+func (s *databaseStorage) DeleteAll(ctx context.Context, prefix string) error {
+	prefix = filepath.ToSlash(filepath.Clean(prefix))
+
+	// If empty prefix, delete all
+	if isRootPath(prefix) {
+		result := s.db.
+			WithContext(ctx).
+			Where("1 = 1"). // Delete everything
+			Delete(&model.Storage{})
+		if result.Error != nil {
+			return fmt.Errorf("failed to delete all files from database: %w", result.Error)
+		}
+		return nil
+	}
+
+	// Ensure prefix ends with / for proper prefix matching
+	if !strings.HasSuffix(prefix, "/") {
+		prefix += "/"
+	}
+
+	query := s.db.WithContext(ctx)
+	query = addPathPrefixClause(s.db.Name(), query, prefix)
+	result := query.Delete(&model.Storage{})
+	if result.Error != nil {
+		return fmt.Errorf("failed to delete files with prefix '%s' from database: %w", prefix, result.Error)
+	}
+
+	return nil
+}
+
+func (s *databaseStorage) List(ctx context.Context, prefix string) ([]ObjectInfo, error) {
+	prefix = filepath.ToSlash(filepath.Clean(prefix))
+
+	var storageItems []model.Storage
+	query := s.db.WithContext(ctx)
+
+	if !isRootPath(prefix) {
+		// Ensure prefix matching
+		if !strings.HasSuffix(prefix, "/") {
+			prefix += "/"
+		}
+		query = addPathPrefixClause(s.db.Name(), query, prefix)
+	}
+
+	result := query.
+		Select("path", "size", "mod_time").
+		Find(&storageItems)
+	if result.Error != nil {
+		return nil, fmt.Errorf("failed to list files from database: %w", result.Error)
+	}
+
+	objects := make([]ObjectInfo, 0, len(storageItems))
+	for _, item := range storageItems {
+		// Filter out directory-like paths (those that contain additional slashes after the prefix)
+		relativePath := strings.TrimPrefix(item.Path, prefix)
+		if strings.ContainsRune(relativePath, '/') {
+			continue
+		}
+
+		objects = append(objects, ObjectInfo{
+			Path:    item.Path,
+			Size:    item.Size,
+			ModTime: time.Time(item.ModTime),
+		})
+	}
+
+	return objects, nil
+}
+
+func (s *databaseStorage) Walk(ctx context.Context, root string, fn func(ObjectInfo) error) error {
+	root = filepath.ToSlash(filepath.Clean(root))
+
+	var storageItems []model.Storage
+	query := s.db.WithContext(ctx)
+
+	if !isRootPath(root) {
+		// Ensure root matching
+		if !strings.HasSuffix(root, "/") {
+			root += "/"
+		}
+		query = addPathPrefixClause(s.db.Name(), query, root)
+	}
+
+	result := query.
+		Select("path", "size", "mod_time").
+		Find(&storageItems)
+	if result.Error != nil {
+		return fmt.Errorf("failed to walk files from database: %w", result.Error)
+	}
+
+	for _, item := range storageItems {
+		err := fn(ObjectInfo{
+			Path:    item.Path,
+			Size:    item.Size,
+			ModTime: time.Time(item.ModTime),
+		})
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func isRootPath(path string) bool {
+	return path == "" || path == "/" || path == "."
+}
+
+func addPathPrefixClause(dialect string, query *gorm.DB, prefix string) *gorm.DB {
+	// In SQLite, we use "GLOB" which can use the index
+	switch dialect {
+	case "sqlite":
+		return query.Where("path GLOB ?", prefix+"*")
+	case "postgres":
+		return query.Where("path LIKE ?", prefix+"%")
+	default:
+		// Indicates a development-time error
+		panic(fmt.Errorf("unsupported database dialect: %s", dialect))
+	}
+}
--- a/backend/internal/storage/database_test.go
+++ b/backend/internal/storage/database_test.go
@@ -0,0 +1,148 @@
+package storage
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	testingutil "github.com/pocket-id/pocket-id/backend/internal/utils/testing"
+)
+
+func TestDatabaseStorageOperations(t *testing.T) {
+	ctx := context.Background()
+	db := testingutil.NewDatabaseForTest(t)
+	store, err := NewDatabaseStorage(db)
+	require.NoError(t, err)
+
+	t.Run("type should be database", func(t *testing.T) {
+		assert.Equal(t, TypeDatabase, store.Type())
+	})
+
+	t.Run("save, open and list files", func(t *testing.T) {
+		err := store.Save(ctx, "images/logo.png", bytes.NewBufferString("logo-data"))
+		require.NoError(t, err)
+
+		reader, size, err := store.Open(ctx, "images/logo.png")
+		require.NoError(t, err)
+		defer reader.Close()
+
+		contents, err := io.ReadAll(reader)
+		require.NoError(t, err)
+		assert.Equal(t, []byte("logo-data"), contents)
+		assert.Equal(t, int64(len(contents)), size)
+
+		err = store.Save(ctx, "images/nested/child.txt", bytes.NewBufferString("child"))
+		require.NoError(t, err)
+
+		files, err := store.List(ctx, "images")
+		require.NoError(t, err)
+		require.Len(t, files, 1)
+		assert.Equal(t, "images/logo.png", files[0].Path)
+		assert.Equal(t, int64(len("logo-data")), files[0].Size)
+	})
+
+	t.Run("save should update existing file", func(t *testing.T) {
+		err := store.Save(ctx, "test/update.txt", bytes.NewBufferString("original"))
+		require.NoError(t, err)
+
+		err = store.Save(ctx, "test/update.txt", bytes.NewBufferString("updated"))
+		require.NoError(t, err)
+
+		reader, size, err := store.Open(ctx, "test/update.txt")
+		require.NoError(t, err)
+		defer reader.Close()
+
+		contents, err := io.ReadAll(reader)
+		require.NoError(t, err)
+		assert.Equal(t, []byte("updated"), contents)
+		assert.Equal(t, int64(len("updated")), size)
+	})
+
+	t.Run("delete files individually", func(t *testing.T) {
+		err := store.Save(ctx, "images/delete-me.txt", bytes.NewBufferString("temp"))
+		require.NoError(t, err)
+
+		require.NoError(t, store.Delete(ctx, "images/delete-me.txt"))
+		_, _, err = store.Open(ctx, "images/delete-me.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+	})
+
+	t.Run("delete missing file should not error", func(t *testing.T) {
+		require.NoError(t, store.Delete(ctx, "images/missing.txt"))
+	})
+
+	t.Run("delete all files", func(t *testing.T) {
+		require.NoError(t, store.Save(ctx, "cleanup/a.txt", bytes.NewBufferString("a")))
+		require.NoError(t, store.Save(ctx, "cleanup/b.txt", bytes.NewBufferString("b")))
+		require.NoError(t, store.Save(ctx, "cleanup/nested/c.txt", bytes.NewBufferString("c")))
+		require.NoError(t, store.DeleteAll(ctx, "/"))
+
+		_, _, err := store.Open(ctx, "cleanup/a.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+
+		_, _, err = store.Open(ctx, "cleanup/b.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+
+		_, _, err = store.Open(ctx, "cleanup/nested/c.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+	})
+
+	t.Run("delete all files under a prefix", func(t *testing.T) {
+		require.NoError(t, store.Save(ctx, "cleanup/a.txt", bytes.NewBufferString("a")))
+		require.NoError(t, store.Save(ctx, "cleanup/b.txt", bytes.NewBufferString("b")))
+		require.NoError(t, store.Save(ctx, "cleanup/nested/c.txt", bytes.NewBufferString("c")))
+		require.NoError(t, store.DeleteAll(ctx, "cleanup"))
+
+		_, _, err := store.Open(ctx, "cleanup/a.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+
+		_, _, err = store.Open(ctx, "cleanup/b.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+
+		_, _, err = store.Open(ctx, "cleanup/nested/c.txt")
+		require.Error(t, err)
+		assert.True(t, IsNotExist(err))
+	})
+
+	t.Run("walk files", func(t *testing.T) {
+		require.NoError(t, store.Save(ctx, "walk/file1.txt", bytes.NewBufferString("1")))
+		require.NoError(t, store.Save(ctx, "walk/file2.txt", bytes.NewBufferString("2")))
+		require.NoError(t, store.Save(ctx, "walk/nested/file3.txt", bytes.NewBufferString("3")))
+
+		var paths []string
+		err := store.Walk(ctx, "walk", func(info ObjectInfo) error {
+			paths = append(paths, info.Path)
+			return nil
+		})
+		require.NoError(t, err)
+		assert.Len(t, paths, 3)
+		assert.Contains(t, paths, "walk/file1.txt")
+		assert.Contains(t, paths, "walk/file2.txt")
+		assert.Contains(t, paths, "walk/nested/file3.txt")
+	})
+}
+
+func TestNewDatabaseStorage(t *testing.T) {
+	t.Run("should return error with nil database", func(t *testing.T) {
+		_, err := NewDatabaseStorage(nil)
+		require.Error(t, err)
+		assert.Contains(t, err.Error(), "database connection is required")
+	})
+
+	t.Run("should create storage with valid database", func(t *testing.T) {
+		db := testingutil.NewDatabaseForTest(t)
+		store, err := NewDatabaseStorage(db)
+		require.NoError(t, err)
+		assert.NotNil(t, store)
+	})
+}
--- a/backend/internal/storage/s3.go
+++ b/backend/internal/storage/s3.go
@@ -18,13 +18,14 @@ import (
 )

 type S3Config struct {
-	Bucket          string
-	Region          string
-	Endpoint        string
-	AccessKeyID     string
-	SecretAccessKey string
-	ForcePathStyle  bool
-	Root            string
+	Bucket                        string
+	Region                        string
+	Endpoint                      string
+	AccessKeyID                   string
+	SecretAccessKey               string
+	ForcePathStyle                bool
+	DisableDefaultIntegrityChecks bool
+	Root                          string
 }

 type s3Storage struct {
@@ -44,6 +45,10 @@ func NewS3Storage(ctx context.Context, cfg S3Config) (FileStorage, error) {
 			o.BaseEndpoint = aws.String(cfg.Endpoint)
 		}
 		o.UsePathStyle = cfg.ForcePathStyle
+		if cfg.DisableDefaultIntegrityChecks {
+			o.RequestChecksumCalculation = aws.RequestChecksumCalculationWhenRequired
+			o.ResponseChecksumValidation = aws.ResponseChecksumValidationWhenRequired
+		}
 	})

 	return &s3Storage{
--- a/backend/internal/storage/storage.go
+++ b/backend/internal/storage/storage.go
@@ -8,7 +8,7 @@ import (
 )

 var (
-	TypeFileSystem = "fs"
+	TypeFileSystem = "filesystem"
 	TypeS3         = "s3"
 )

--- a/backend/internal/utils/callback_url_util.go
+++ b/backend/internal/utils/callback_url_util.go
@@ -0,0 +1,199 @@
+package utils
+
+import (
+	"net"
+	"net/url"
+	"path"
+	"regexp"
+	"strings"
+)
+
+// GetCallbackURLFromList returns the first callback URL that matches the input callback URL
+func GetCallbackURLFromList(urls []string, inputCallbackURL string) (callbackURL string, err error) {
+	// Special case for Loopback Interface Redirection. Quoting from RFC 8252 section 7.3:
+	// https://datatracker.ietf.org/doc/html/rfc8252#section-7.3
+	//
+	//	 The authorization server MUST allow any port to be specified at the
+	//   time of the request for loopback IP redirect URIs, to accommodate
+	//   clients that obtain an available ephemeral port from the operating
+	//   system at the time of the request.
+	loopbackRedirect := ""
+	u, _ := url.Parse(inputCallbackURL)
+
+	if u != nil && u.Scheme == "http" {
+		host := u.Hostname()
+		ip := net.ParseIP(host)
+		if host == "localhost" || (ip != nil && ip.IsLoopback()) {
+			loopbackRedirect = u.String()
+			u.Host = host
+			inputCallbackURL = u.String()
+		}
+	}
+
+	for _, pattern := range urls {
+		matches, err := matchCallbackURL(pattern, inputCallbackURL)
+		if err != nil {
+			return "", err
+		} else if !matches {
+			continue
+		}
+
+		if loopbackRedirect != "" {
+			return loopbackRedirect, nil
+		}
+		return inputCallbackURL, nil
+	}
+
+	return "", nil
+}
+
+// matchCallbackURL checks if the input callback URL matches the given pattern.
+// It supports wildcard matching for paths and query parameters.
+//
+// The base URL (scheme, userinfo, host, port) and query parameters supports single '*' wildcards only,
+// while the path supports both single '*' and double '**' wildcards.
+func matchCallbackURL(pattern string, inputCallbackURL string) (matches bool, err error) {
+	if pattern == inputCallbackURL || pattern == "*" {
+		return true, nil
+	}
+
+	// Strip fragment part
+	// The endpoint URI MUST NOT include a fragment component.
+	// https://datatracker.ietf.org/doc/html/rfc6749#section-3.1.2
+	pattern, _, _ = strings.Cut(pattern, "#")
+	inputCallbackURL, _, _ = strings.Cut(inputCallbackURL, "#")
+
+	// Store and strip query part
+	var patternQuery url.Values
+	if i := strings.Index(pattern, "?"); i >= 0 {
+		patternQuery, err = url.ParseQuery(pattern[i+1:])
+		if err != nil {
+			return false, err
+		}
+		pattern = pattern[:i]
+	}
+	var inputQuery url.Values
+	if i := strings.Index(inputCallbackURL, "?"); i >= 0 {
+		inputQuery, err = url.ParseQuery(inputCallbackURL[i+1:])
+		if err != nil {
+			return false, err
+		}
+		inputCallbackURL = inputCallbackURL[:i]
+	}
+
+	// Split both pattern and input parts
+	patternParts, patternPath := splitParts(pattern)
+	inputParts, inputPath := splitParts(inputCallbackURL)
+
+	// Verify everything except the path and query parameters
+	if len(patternParts) != len(inputParts) {
+		return false, nil
+	}
+
+	for i, patternPart := range patternParts {
+		matched, err := path.Match(patternPart, inputParts[i])
+		if err != nil || !matched {
+			return false, err
+		}
+	}
+
+	// Verify path with wildcard support
+	matched, err := matchPath(patternPath, inputPath)
+	if err != nil || !matched {
+		return false, err
+	}
+
+	// Verify query parameters
+	if len(patternQuery) != len(inputQuery) {
+		return false, nil
+	}
+
+	for patternKey, patternValues := range patternQuery {
+		inputValues, exists := inputQuery[patternKey]
+		if !exists {
+			return false, nil
+		}
+
+		if len(patternValues) != len(inputValues) {
+			return false, nil
+		}
+
+		for i := range patternValues {
+			matched, err := path.Match(patternValues[i], inputValues[i])
+			if err != nil || !matched {
+				return false, err
+			}
+		}
+	}
+
+	return true, nil
+}
+
+// matchPath matches the input path against the pattern with wildcard support
+// Supported wildcards:
+//
+//	'*'  matches any sequence of characters except '/'
+//	'**' matches any sequence of characters including '/'
+func matchPath(pattern string, input string) (matches bool, err error) {
+	var regexPattern strings.Builder
+	regexPattern.WriteString("^")
+
+	runes := []rune(pattern)
+	n := len(runes)
+
+	for i := 0; i < n; {
+		switch runes[i] {
+		case '*':
+			// Check if it's a ** (globstar)
+			if i+1 < n && runes[i+1] == '*' {
+				// globstar = .* (match slashes too)
+				regexPattern.WriteString(".*")
+				i += 2
+			} else {
+				// single * = [^/]* (no slash)
+				regexPattern.WriteString(`[^/]*`)
+				i++
+			}
+		default:
+			regexPattern.WriteString(regexp.QuoteMeta(string(runes[i])))
+			i++
+		}
+	}
+
+	regexPattern.WriteString("$")
+
+	matched, err := regexp.MatchString(regexPattern.String(), input)
+	return matched, err
+}
+
+// splitParts splits the URL into parts by special characters and returns the path separately
+func splitParts(s string) (parts []string, path string) {
+	split := func(r rune) bool {
+		return r == ':' || r == '/' || r == '[' || r == ']' || r == '@' || r == '.'
+	}
+
+	pathStart := -1
+
+	// Look for scheme:// first
+	if i := strings.Index(s, "://"); i >= 0 {
+		// Look for the next slash after scheme://
+		rest := s[i+3:]
+		if j := strings.IndexRune(rest, '/'); j >= 0 {
+			pathStart = i + 3 + j
+		}
+	} else {
+		// Otherwise, first slash is path start
+		pathStart = strings.IndexRune(s, '/')
+	}
+
+	if pathStart >= 0 {
+		path = s[pathStart:]
+		base := s[:pathStart]
+		parts = strings.FieldsFunc(base, split)
+	} else {
+		parts = strings.FieldsFunc(s, split)
+		path = ""
+	}
+
+	return parts, path
+}
--- a/backend/internal/utils/callback_url_util_test.go
+++ b/backend/internal/utils/callback_url_util_test.go
@@ -0,0 +1,784 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMatchCallbackURL(t *testing.T) {
+	tests := []struct {
+		name        string
+		pattern     string
+		input       string
+		shouldMatch bool
+	}{
+		// Basic matching
+		{
+			"exact match",
+			"https://example.com/callback",
+			"https://example.com/callback",
+			true,
+		},
+		{
+			"no match",
+			"https://example.org/callback",
+			"https://example.com/callback",
+			false,
+		},
+
+		// Scheme
+		{
+			"scheme mismatch",
+			"https://example.com/callback",
+			"http://example.com/callback",
+			false,
+		},
+		{
+			"wildcard scheme",
+			"*://example.com/callback",
+			"https://example.com/callback",
+			true,
+		},
+
+		// Hostname
+		{
+			"hostname mismatch",
+			"https://example.com/callback",
+			"https://malicious.com/callback",
+			false,
+		},
+		{
+			"wildcard subdomain",
+			"https://*.example.com/callback",
+			"https://subdomain.example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in hostname prefix",
+			"https://app*.example.com/callback",
+			"https://app1.example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in hostname suffix",
+			"https://*-prod.example.com/callback",
+			"https://api-prod.example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in hostname middle",
+			"https://app-*-server.example.com/callback",
+			"https://app-staging-server.example.com/callback",
+			true,
+		},
+		{
+			"subdomain wildcard doesn't match domain hijack attempt",
+			"https://*.example.com/callback",
+			"https://malicious.site?url=abc.example.com/callback",
+			false,
+		},
+		{
+			"hostname mismatch with confusable characters",
+			"https://example.com/callback",
+			"https://examp1e.com/callback",
+			false,
+		},
+		{
+			"hostname mismatch with homograph attack",
+			"https://example.com/callback",
+			"https://еxample.com/callback",
+			false,
+		},
+
+		// Port
+		{
+			"port mismatch",
+			"https://example.com:8080/callback",
+			"https://example.com:9090/callback",
+			false,
+		},
+		{
+			"wildcard port",
+			"https://example.com:*/callback",
+			"https://example.com:8080/callback",
+			true,
+		},
+		{
+			"partial wildcard in port prefix",
+			"https://example.com:80*/callback",
+			"https://example.com:8080/callback",
+			true,
+		},
+
+		// Path
+		{
+			"path mismatch",
+			"https://example.com/callback",
+			"https://example.com/other",
+			false,
+		},
+		{
+			"wildcard path segment",
+			"https://example.com/api/*/callback",
+			"https://example.com/api/v1/callback",
+			true,
+		},
+		{
+			"wildcard entire path",
+			"https://example.com/*",
+			"https://example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in path prefix",
+			"https://example.com/test*",
+			"https://example.com/testcase",
+			true,
+		},
+		{
+			"partial wildcard in path suffix",
+			"https://example.com/*-callback",
+			"https://example.com/oauth-callback",
+			true,
+		},
+		{
+			"partial wildcard in path middle",
+			"https://example.com/api-*-v1/callback",
+			"https://example.com/api-internal-v1/callback",
+			true,
+		},
+		{
+			"multiple partial wildcards in path",
+			"https://example.com/*/test*/callback",
+			"https://example.com/v1/testing/callback",
+			true,
+		},
+		{
+			"multiple wildcard segments in path",
+			"https://example.com/**/callback",
+			"https://example.com/api/v1/foo/bar/callback",
+			true,
+		},
+		{
+			"multiple wildcard segments in path",
+			"https://example.com/**/v1/**/callback",
+			"https://example.com/api/v1/foo/bar/callback",
+			true,
+		},
+		{
+			"partial wildcard matching full path segment",
+			"https://example.com/foo-*",
+			"https://example.com/foo-bar",
+			true,
+		},
+
+		// Credentials
+		{
+			"username mismatch",
+			"https://user:pass@example.com/callback",
+			"https://admin:pass@example.com/callback",
+			false,
+		},
+		{
+			"missing credentials",
+			"https://user:pass@example.com/callback",
+			"https://example.com/callback",
+			false,
+		},
+		{
+			"unexpected credentials",
+			"https://example.com/callback",
+			"https://user:pass@example.com/callback",
+			false,
+		},
+		{
+			"wildcard password",
+			"https://user:*@example.com/callback",
+			"https://user:secret123@example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in username",
+			"https://admin*:pass@example.com/callback",
+			"https://admin123:pass@example.com/callback",
+			true,
+		},
+		{
+			"partial wildcard in password",
+			"https://user:pass*@example.com/callback",
+			"https://user:password123@example.com/callback",
+			true,
+		},
+		{
+			"wildcard password doesn't allow domain hijack",
+			"https://user:*@example.com/callback",
+			"https://user:password@malicious.site#example.com/callback",
+			false,
+		},
+		{
+			"credentials with @ in password trying to hijack hostname",
+			"https://user:pass@example.com/callback",
+			"https://user:pass@evil.com@example.com/callback",
+			false,
+		},
+
+		// Query parameters
+		{
+			"extra query parameter",
+			"https://example.com/callback?code=*",
+			"https://example.com/callback?code=abc123&extra=value",
+			false,
+		},
+		{
+			"missing query parameter",
+			"https://example.com/callback?code=*&state=*",
+			"https://example.com/callback?code=abc123",
+			false,
+		},
+		{
+			"query parameter after fragment",
+			"https://example.com/callback?code=123",
+			"https://example.com/callback#section?code=123",
+			false,
+		},
+		{
+			"query parameter name mismatch",
+			"https://example.com/callback?code=*",
+			"https://example.com/callback?token=abc123",
+			false,
+		},
+		{
+			"wildcard query parameter",
+			"https://example.com/callback?code=*",
+			"https://example.com/callback?code=abc123",
+			true,
+		},
+		{
+			"multiple query parameters",
+			"https://example.com/callback?code=*&state=*",
+			"https://example.com/callback?code=abc123&state=xyz789",
+			true,
+		},
+		{
+			"query parameters in different order",
+			"https://example.com/callback?state=*&code=*",
+			"https://example.com/callback?code=abc123&state=xyz789",
+			true,
+		},
+		{
+			"exact query parameter value",
+			"https://example.com/callback?mode=production",
+			"https://example.com/callback?mode=production",
+			true,
+		},
+		{
+			"query parameter value mismatch",
+			"https://example.com/callback?mode=production",
+			"https://example.com/callback?mode=development",
+			false,
+		},
+		{
+			"mixed exact and wildcard query parameters",
+			"https://example.com/callback?mode=production&code=*",
+			"https://example.com/callback?mode=production&code=abc123",
+			true,
+		},
+		{
+			"mixed exact and wildcard with wrong exact value",
+			"https://example.com/callback?mode=production&code=*",
+			"https://example.com/callback?mode=development&code=abc123",
+			false,
+		},
+		{
+			"multiple values for same parameter",
+			"https://example.com/callback?param=*&param=*",
+			"https://example.com/callback?param=value1&param=value2",
+			true,
+		},
+		{
+			"unexpected query parameters",
+			"https://example.com/callback",
+			"https://example.com/callback?extra=value",
+			false,
+		},
+		{
+			"query parameter with redirect to external site",
+			"https://example.com/callback?code=*",
+			"https://example.com/callback?code=123&redirect=https://evil.com",
+			false,
+		},
+		{
+			"open redirect via encoded URL in query param",
+			"https://example.com/callback?state=*",
+			"https://example.com/callback?state=abc&next=//evil.com",
+			false,
+		},
+
+		// Fragment
+		{
+			"fragment ignored when both pattern and input have fragment",
+			"https://example.com/callback#fragment",
+			"https://example.com/callback#fragment",
+			true,
+		},
+		{
+			"fragment ignored when pattern has fragment but input doesn't",
+			"https://example.com/callback#fragment",
+			"https://example.com/callback",
+			true,
+		},
+		{
+			"fragment ignored when input has fragment but pattern doesn't",
+			"https://example.com/callback",
+			"https://example.com/callback#section",
+			true,
+		},
+
+		// Path traversal and injection attempts
+		{
+			"path traversal attempt",
+			"https://example.com/callback",
+			"https://example.com/../admin/callback",
+			false,
+		},
+		{
+			"backslash instead of forward slash",
+			"https://example.com/callback",
+			"https://example.com\\callback",
+			false,
+		},
+		{
+			"double slash in hostname (protocol smuggling)",
+			"https://example.com/callback",
+			"https://example.com//evil.com/callback",
+			false,
+		},
+		{
+			"CRLF injection attempt in path",
+			"https://example.com/callback",
+			"https://example.com/callback%0d%0aLocation:%20https://evil.com",
+			false,
+		},
+		{
+			"null byte injection",
+			"https://example.com/callback",
+			"https://example.com/callback%00.evil.com",
+			false,
+		},
+	}
+
+	for _, tt := range tests {
+		matches, err := matchCallbackURL(tt.pattern, tt.input)
+		require.NoError(t, err, tt.name)
+		assert.Equal(t, tt.shouldMatch, matches, tt.name)
+
+	}
+}
+
+func TestGetCallbackURLFromList_LoopbackSpecialHandling(t *testing.T) {
+	tests := []struct {
+		name             string
+		urls             []string
+		inputCallbackURL string
+		expectedURL      string
+		expectMatch      bool
+	}{
+		{
+			name:             "127.0.0.1 with dynamic port - exact match",
+			urls:             []string{"http://127.0.0.1/callback"},
+			inputCallbackURL: "http://127.0.0.1:8080/callback",
+			expectedURL:      "http://127.0.0.1:8080/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "127.0.0.1 with different port",
+			urls:             []string{"http://127.0.0.1/callback"},
+			inputCallbackURL: "http://127.0.0.1:9999/callback",
+			expectedURL:      "http://127.0.0.1:9999/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "IPv6 loopback with dynamic port",
+			urls:             []string{"http://[::1]/callback"},
+			inputCallbackURL: "http://[::1]:8080/callback",
+			expectedURL:      "http://[::1]:8080/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "IPv6 loopback without brackets in input",
+			urls:             []string{"http://[::1]/callback"},
+			inputCallbackURL: "http://::1:8080/callback",
+			expectedURL:      "http://::1:8080/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "localhost with dynamic port",
+			urls:             []string{"http://localhost/callback"},
+			inputCallbackURL: "http://localhost:8080/callback",
+			expectedURL:      "http://localhost:8080/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "https loopback doesn't trigger special handling",
+			urls:             []string{"https://127.0.0.1/callback"},
+			inputCallbackURL: "https://127.0.0.1:8080/callback",
+			expectedURL:      "",
+			expectMatch:      false,
+		},
+		{
+			name:             "loopback with path match",
+			urls:             []string{"http://127.0.0.1/auth/*"},
+			inputCallbackURL: "http://127.0.0.1:3000/auth/callback",
+			expectedURL:      "http://127.0.0.1:3000/auth/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "loopback with path mismatch",
+			urls:             []string{"http://127.0.0.1/callback"},
+			inputCallbackURL: "http://127.0.0.1:8080/different",
+			expectedURL:      "",
+			expectMatch:      false,
+		},
+		{
+			name:             "non-loopback IP",
+			urls:             []string{"http://192.168.1.1/callback"},
+			inputCallbackURL: "http://192.168.1.1:8080/callback",
+			expectedURL:      "",
+			expectMatch:      false,
+		},
+		{
+			name:             "wildcard matches loopback",
+			urls:             []string{"*"},
+			inputCallbackURL: "http://127.0.0.1:8080/callback",
+			expectedURL:      "http://127.0.0.1:8080/callback",
+			expectMatch:      true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := GetCallbackURLFromList(tt.urls, tt.inputCallbackURL)
+			require.NoError(t, err)
+			if tt.expectMatch {
+				assert.Equal(t, tt.expectedURL, result)
+			} else {
+				assert.Empty(t, result)
+			}
+		})
+	}
+}
+
+func TestGetCallbackURLFromList_MultiplePatterns(t *testing.T) {
+	tests := []struct {
+		name             string
+		urls             []string
+		inputCallbackURL string
+		expectedURL      string
+		expectMatch      bool
+	}{
+		{
+			name: "matches first pattern",
+			urls: []string{
+				"https://example.com/callback",
+				"https://example.org/callback",
+			},
+			inputCallbackURL: "https://example.com/callback",
+			expectedURL:      "https://example.com/callback",
+			expectMatch:      true,
+		},
+		{
+			name: "matches second pattern",
+			urls: []string{
+				"https://example.com/callback",
+				"https://example.org/callback",
+			},
+			inputCallbackURL: "https://example.org/callback",
+			expectedURL:      "https://example.org/callback",
+			expectMatch:      true,
+		},
+		{
+			name: "matches none",
+			urls: []string{
+				"https://example.com/callback",
+				"https://example.org/callback",
+			},
+			inputCallbackURL: "https://malicious.com/callback",
+			expectedURL:      "",
+			expectMatch:      false,
+		},
+		{
+			name: "matches wildcard pattern",
+			urls: []string{
+				"https://example.com/callback",
+				"https://*.example.org/callback",
+			},
+			inputCallbackURL: "https://subdomain.example.org/callback",
+			expectedURL:      "https://subdomain.example.org/callback",
+			expectMatch:      true,
+		},
+		{
+			name:             "empty pattern list",
+			urls:             []string{},
+			inputCallbackURL: "https://example.com/callback",
+			expectedURL:      "",
+			expectMatch:      false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := GetCallbackURLFromList(tt.urls, tt.inputCallbackURL)
+			require.NoError(t, err)
+			if tt.expectMatch {
+				assert.Equal(t, tt.expectedURL, result)
+			} else {
+				assert.Empty(t, result)
+			}
+		})
+	}
+}
+
+func TestMatchPath(t *testing.T) {
+	tests := []struct {
+		name        string
+		pattern     string
+		input       string
+		shouldMatch bool
+	}{
+		// Exact matches
+		{
+			name:        "exact match",
+			pattern:     "/callback",
+			input:       "/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "exact mismatch",
+			pattern:     "/callback",
+			input:       "/other",
+			shouldMatch: false,
+		},
+		{
+			name:        "empty paths",
+			pattern:     "",
+			input:       "",
+			shouldMatch: true,
+		},
+
+		// Single wildcard (*)
+		{
+			name:        "single wildcard matches segment",
+			pattern:     "/api/*/callback",
+			input:       "/api/v1/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "single wildcard doesn't match multiple segments",
+			pattern:     "/api/*/callback",
+			input:       "/api/v1/v2/callback",
+			shouldMatch: false,
+		},
+		{
+			name:        "single wildcard at end",
+			pattern:     "/callback/*",
+			input:       "/callback/test",
+			shouldMatch: true,
+		},
+		{
+			name:        "single wildcard at start",
+			pattern:     "/*/callback",
+			input:       "/api/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "multiple single wildcards",
+			pattern:     "/*/test/*",
+			input:       "/api/test/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "partial wildcard prefix",
+			pattern:     "/test*",
+			input:       "/testing",
+			shouldMatch: true,
+		},
+		{
+			name:        "partial wildcard suffix",
+			pattern:     "/*-callback",
+			input:       "/oauth-callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "partial wildcard middle",
+			pattern:     "/api-*-v1",
+			input:       "/api-internal-v1",
+			shouldMatch: true,
+		},
+
+		// Double wildcard (**)
+		{
+			name:        "double wildcard matches multiple segments",
+			pattern:     "/api/**/callback",
+			input:       "/api/v1/v2/v3/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "double wildcard matches single segment",
+			pattern:     "/api/**/callback",
+			input:       "/api/v1/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "double wildcard doesn't match when pattern has extra slashes",
+			pattern:     "/api/**/callback",
+			input:       "/api/callback",
+			shouldMatch: false,
+		},
+		{
+			name:        "double wildcard at end",
+			pattern:     "/api/**",
+			input:       "/api/v1/v2/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "double wildcard in middle",
+			pattern:     "/api/**/v2/**/callback",
+			input:       "/api/v1/v2/v3/v4/callback",
+			shouldMatch: true,
+		},
+
+		// Complex patterns
+		{
+			name:        "mix of single and double wildcards",
+			pattern:     "/*/api/**/callback",
+			input:       "/app/api/v1/v2/callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "wildcard with special characters",
+			pattern:     "/callback-*",
+			input:       "/callback-123",
+			shouldMatch: true,
+		},
+		{
+			name:        "path with query-like string (no special handling)",
+			pattern:     "/callback?code=*",
+			input:       "/callback?code=abc",
+			shouldMatch: true,
+		},
+
+		// Edge cases
+		{
+			name:        "single wildcard matches empty segment",
+			pattern:     "/api/*/callback",
+			input:       "/api//callback",
+			shouldMatch: true,
+		},
+		{
+			name:        "pattern longer than input",
+			pattern:     "/api/v1/callback",
+			input:       "/api",
+			shouldMatch: false,
+		},
+		{
+			name:        "input longer than pattern",
+			pattern:     "/api",
+			input:       "/api/v1/callback",
+			shouldMatch: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			matches, err := matchPath(tt.pattern, tt.input)
+			require.NoError(t, err)
+			assert.Equal(t, tt.shouldMatch, matches)
+		})
+	}
+}
+
+func TestSplitParts(t *testing.T) {
+	tests := []struct {
+		name          string
+		input         string
+		expectedParts []string
+		expectedPath  string
+	}{
+		{
+			name:          "simple https URL",
+			input:         "https://example.com/callback",
+			expectedParts: []string{"https", "example", "com"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "URL with port",
+			input:         "https://example.com:8080/callback",
+			expectedParts: []string{"https", "example", "com", "8080"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "URL with subdomain",
+			input:         "https://api.example.com/callback",
+			expectedParts: []string{"https", "api", "example", "com"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "URL with credentials",
+			input:         "https://user:pass@example.com/callback",
+			expectedParts: []string{"https", "user", "pass", "example", "com"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "URL without path",
+			input:         "https://example.com",
+			expectedParts: []string{"https", "example", "com"},
+			expectedPath:  "",
+		},
+		{
+			name:          "URL with deep path",
+			input:         "https://example.com/api/v1/callback",
+			expectedParts: []string{"https", "example", "com"},
+			expectedPath:  "/api/v1/callback",
+		},
+		{
+			name:          "URL with path and query",
+			input:         "https://example.com/callback?code=123",
+			expectedParts: []string{"https", "example", "com"},
+			expectedPath:  "/callback?code=123",
+		},
+		{
+			name:          "URL with trailing slash",
+			input:         "https://example.com/",
+			expectedParts: []string{"https", "example", "com"},
+			expectedPath:  "/",
+		},
+		{
+			name:          "URL with multiple subdomains",
+			input:         "https://api.v1.staging.example.com/callback",
+			expectedParts: []string{"https", "api", "v1", "staging", "example", "com"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "URL with port and credentials",
+			input:         "https://user:pass@example.com:8080/callback",
+			expectedParts: []string{"https", "user", "pass", "example", "com", "8080"},
+			expectedPath:  "/callback",
+		},
+		{
+			name:          "scheme with authority separator but no slash",
+			input:         "http://example.com",
+			expectedParts: []string{"http", "example", "com"},
+			expectedPath:  "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			parts, path := splitParts(tt.input)
+			assert.Equal(t, tt.expectedParts, parts, "parts mismatch")
+			assert.Equal(t, tt.expectedPath, path, "path mismatch")
+		})
+	}
+}
--- a/backend/internal/utils/cookie/add_cookie.go
+++ b/backend/internal/utils/cookie/add_cookie.go
@@ -1,6 +1,8 @@
 package cookie

 import (
+	"time"
+
 	"github.com/gin-gonic/gin"
 )

@@ -11,3 +13,7 @@ func AddAccessTokenCookie(c *gin.Context, maxAgeInSeconds int, token string) {
 func AddSessionIdCookie(c *gin.Context, maxAgeInSeconds int, sessionID string) {
 	c.SetCookie(SessionIdCookieName, sessionID, maxAgeInSeconds, "/", "", true, true)
 }
+
+func AddDeviceTokenCookie(c *gin.Context, deviceToken string) {
+	c.SetCookie(DeviceTokenCookieName, deviceToken, int(15*time.Minute.Seconds()), "/api/one-time-access-token", "", true, true)
+}
--- a/backend/internal/utils/cookie/cookie_names.go
+++ b/backend/internal/utils/cookie/cookie_names.go
@@ -8,10 +8,12 @@ import (

 var AccessTokenCookieName = "__Host-access_token"
 var SessionIdCookieName = "__Host-session"
+var DeviceTokenCookieName = "__Host-device_token" //nolint:gosec

 func init() {
 	if strings.HasPrefix(common.EnvConfig.AppURL, "http://") {
 		AccessTokenCookieName = "access_token"
 		SessionIdCookieName = "session"
+		DeviceTokenCookieName = "device_token"
 	}
 }
--- a/backend/internal/utils/db_migration_util.go
+++ b/backend/internal/utils/db_migration_util.go
@@ -0,0 +1,130 @@
+package utils
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"log/slog"
+
+	"github.com/golang-migrate/migrate/v4"
+	"github.com/golang-migrate/migrate/v4/database"
+	postgresMigrate "github.com/golang-migrate/migrate/v4/database/postgres"
+	sqliteMigrate "github.com/golang-migrate/migrate/v4/database/sqlite3"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
+	"github.com/pocket-id/pocket-id/backend/internal/common"
+	"github.com/pocket-id/pocket-id/backend/resources"
+)
+
+// MigrateDatabase applies database migrations using embedded migration files or fetches them from GitHub if a downgrade is detected.
+func MigrateDatabase(sqlDb *sql.DB) error {
+	m, err := GetEmbeddedMigrateInstance(sqlDb)
+	if err != nil {
+		return fmt.Errorf("failed to get migrate instance: %w", err)
+	}
+
+	path := "migrations/" + string(common.EnvConfig.DbProvider)
+	requiredVersion, err := getRequiredMigrationVersion(path)
+	if err != nil {
+		return fmt.Errorf("failed to get last migration version: %w", err)
+	}
+
+	currentVersion, _, _ := m.Version()
+	if currentVersion > requiredVersion {
+		slog.Warn("Database version is newer than the application supports, possible downgrade detected", slog.Uint64("db_version", uint64(currentVersion)), slog.Uint64("app_version", uint64(requiredVersion)))
+		if !common.EnvConfig.AllowDowngrade {
+			return fmt.Errorf("database version (%d) is newer than application version (%d), downgrades are not allowed (set ALLOW_DOWNGRADE=true to enable)", currentVersion, requiredVersion)
+		}
+		slog.Info("Fetching migrations from GitHub to handle possible downgrades")
+		return migrateDatabaseFromGitHub(sqlDb, requiredVersion)
+	}
+
+	if err := m.Migrate(requiredVersion); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return fmt.Errorf("failed to apply embedded migrations: %w", err)
+	}
+	return nil
+}
+
+// GetEmbeddedMigrateInstance creates a migrate.Migrate instance using embedded migration files.
+func GetEmbeddedMigrateInstance(sqlDb *sql.DB) (*migrate.Migrate, error) {
+	path := "migrations/" + string(common.EnvConfig.DbProvider)
+	source, err := iofs.New(resources.FS, path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create embedded migration source: %w", err)
+	}
+
+	driver, err := newMigrationDriver(sqlDb, common.EnvConfig.DbProvider)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create migration driver: %w", err)
+	}
+
+	m, err := migrate.NewWithInstance("iofs", source, "pocket-id", driver)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create migration instance: %w", err)
+	}
+	return m, nil
+}
+
+// newMigrationDriver creates a database.Driver instance based on the given database provider.
+func newMigrationDriver(sqlDb *sql.DB, dbProvider common.DbProvider) (driver database.Driver, err error) {
+	switch dbProvider {
+	case common.DbProviderSqlite:
+		driver, err = sqliteMigrate.WithInstance(sqlDb, &sqliteMigrate.Config{
+			NoTxWrap: true,
+		})
+	case common.DbProviderPostgres:
+		driver, err = postgresMigrate.WithInstance(sqlDb, &postgresMigrate.Config{})
+	default:
+		// Should never happen at this point
+		return nil, fmt.Errorf("unsupported database provider: %s", common.EnvConfig.DbProvider)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("failed to create migration driver: %w", err)
+	}
+
+	return driver, nil
+}
+
+// migrateDatabaseFromGitHub applies database migrations fetched from GitHub to handle downgrades.
+func migrateDatabaseFromGitHub(sqlDb *sql.DB, version uint) error {
+	srcURL := "github://pocket-id/pocket-id/backend/resources/migrations/" + string(common.EnvConfig.DbProvider)
+
+	driver, err := newMigrationDriver(sqlDb, common.EnvConfig.DbProvider)
+	if err != nil {
+		return fmt.Errorf("failed to create migration driver: %w", err)
+	}
+
+	m, err := migrate.NewWithDatabaseInstance(srcURL, "pocket-id", driver)
+	if err != nil {
+		return fmt.Errorf("failed to create GitHub migration instance: %w", err)
+	}
+
+	if err := m.Migrate(version); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return fmt.Errorf("failed to apply GitHub migrations: %w", err)
+	}
+	return nil
+}
+
+// getRequiredMigrationVersion reads the embedded migration files and returns the highest version number found.
+func getRequiredMigrationVersion(path string) (uint, error) {
+	entries, err := resources.FS.ReadDir(path)
+	if err != nil {
+		return 0, fmt.Errorf("failed to read migration directory: %w", err)
+	}
+
+	var maxVersion uint
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		name := entry.Name()
+		var version uint
+		n, err := fmt.Sscanf(name, "%d_", &version)
+		if err == nil && n == 1 {
+			if version > maxVersion {
+				maxVersion = version
+			}
+		}
+	}
+
+	return maxVersion, nil
+}
--- a/backend/internal/utils/db_util.go
+++ b/backend/internal/utils/db_util.go
@@ -0,0 +1,116 @@
+package utils
+
+import (
+	"fmt"
+	"strings"
+
+	"gorm.io/gorm"
+)
+
+// DBTableExists checks if a table exists in the database
+func DBTableExists(db *gorm.DB, tableName string) (exists bool, err error) {
+	switch db.Name() {
+	case "postgres":
+		query := `SELECT EXISTS (
+			SELECT FROM information_schema.tables 
+			WHERE table_schema = 'public' 
+			AND table_name = ?
+		)`
+		err = db.Raw(query, tableName).Scan(&exists).Error
+		if err != nil {
+			return false, err
+		}
+	case "sqlite":
+		query := `SELECT COUNT(*) > 0 FROM sqlite_master WHERE type='table' AND name=?`
+		err = db.Raw(query, tableName).Scan(&exists).Error
+		if err != nil {
+			return false, err
+		}
+	default:
+		return false, fmt.Errorf("unsupported database dialect: %s", db.Name())
+	}
+
+	return exists, nil
+}
+
+type DBSchemaColumn struct {
+	Name     string
+	Nullable bool
+}
+type DBSchemaTableTypes = map[string]DBSchemaColumn
+type DBSchemaTypes = map[string]DBSchemaTableTypes
+
+// LoadDBSchemaTypes retrieves the column types for all tables in the DB
+// Result is a map of "table --> column --> {name: column type name, nullable: boolean}"
+func LoadDBSchemaTypes(db *gorm.DB) (result DBSchemaTypes, err error) {
+	result = make(DBSchemaTypes)
+
+	switch db.Name() {
+	case "postgres":
+		var rows []struct {
+			TableName  string
+			ColumnName string
+			DataType   string
+			Nullable   bool
+		}
+		err := db.
+			Raw(`
+				SELECT table_name, column_name, data_type, is_nullable = 'YES' AS nullable
+				FROM information_schema.columns
+				WHERE table_schema = 'public';
+			`).
+			Scan(&rows).
+			Error
+		if err != nil {
+			return nil, err
+		}
+		for _, r := range rows {
+			t := strings.ToLower(r.DataType)
+			if result[r.TableName] == nil {
+				result[r.TableName] = make(map[string]DBSchemaColumn)
+			}
+			result[r.TableName][r.ColumnName] = DBSchemaColumn{
+				Name:     strings.ToLower(t),
+				Nullable: r.Nullable,
+			}
+		}
+
+	case "sqlite":
+		var tables []string
+		err = db.
+			Raw(`SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%';`).
+			Scan(&tables).
+			Error
+		if err != nil {
+			return nil, err
+		}
+		for _, table := range tables {
+			var cols []struct {
+				Name    string
+				Type    string
+				Notnull bool
+			}
+			err := db.
+				Raw(`PRAGMA table_info("` + table + `");`).
+				Scan(&cols).
+				Error
+			if err != nil {
+				return nil, err
+			}
+			for _, c := range cols {
+				if result[table] == nil {
+					result[table] = make(map[string]DBSchemaColumn)
+				}
+				result[table][c.Name] = DBSchemaColumn{
+					Name:     strings.ToLower(c.Type),
+					Nullable: !c.Notnull,
+				}
+			}
+		}
+
+	default:
+		return nil, fmt.Errorf("unsupported database dialect: %s", db.Name())
+	}
+
+	return result, nil
+}
--- a/backend/internal/utils/image/profile_picture.go
+++ b/backend/internal/utils/image/profile_picture.go
@@ -12,24 +12,36 @@ import (
 	"golang.org/x/image/font"
 	"golang.org/x/image/font/opentype"
 	"golang.org/x/image/math/fixed"
+	"golang.org/x/image/webp"

 	"github.com/pocket-id/pocket-id/backend/resources"
 )

 const profilePictureSize = 300

-// CreateProfilePicture resizes the profile picture to a square
-func CreateProfilePicture(file io.Reader) (io.ReadSeeker, error) {
+// CreateProfilePicture resizes the profile picture to a square and encodes it as PNG
+func CreateProfilePicture(file io.ReadSeeker) (io.ReadSeeker, error) {
+	// Attempt standard formats first
 	img, _, err := imageorient.Decode(file)
 	if err != nil {
-		return nil, fmt.Errorf("failed to decode image: %w", err)
+		if _, seekErr := file.Seek(0, io.SeekStart); seekErr != nil {
+			return nil, fmt.Errorf("failed to seek file: %w", seekErr)
+		}
+		// Try WebP
+		webpImg, webpErr := webp.Decode(file)
+		if webpErr != nil {
+			return nil, fmt.Errorf("failed to decode image: %w", err)
+		}
+
+		img = webpImg
 	}

+	// Resize to square
 	img = imaging.Fill(img, profilePictureSize, profilePictureSize, imaging.Center, imaging.Lanczos)

+	// Encode back to PNG
 	var buf bytes.Buffer
-	err = imaging.Encode(&buf, img, imaging.PNG)
-	if err != nil {
+	if err := imaging.Encode(&buf, img, imaging.PNG); err != nil {
 		return nil, fmt.Errorf("failed to encode image: %w", err)
 	}

--- a/backend/internal/utils/ip_util.go
+++ b/backend/internal/utils/ip_util.go
@@ -1,7 +1,10 @@
 package utils

 import (
+	"context"
+	"errors"
 	"net"
+	"net/url"
 	"strings"

 	"github.com/pocket-id/pocket-id/backend/internal/common"
@@ -56,6 +59,23 @@ func IsPrivateIP(ip net.IP) bool {
 	return IsLocalhostIP(ip) || IsPrivateLanIP(ip) || IsTailscaleIP(ip) || IsLocalIPv6(ip)
 }

+func IsURLPrivate(ctx context.Context, u *url.URL) (bool, error) {
+	var r net.Resolver
+	ips, err := r.LookupIPAddr(ctx, u.Hostname())
+	if err != nil || len(ips) == 0 {
+		return false, errors.New("cannot resolve hostname")
+	}
+
+	// Prevents SSRF by allowing only public IPs
+	for _, addr := range ips {
+		if IsPrivateIP(addr.IP) {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
 func listContainsIP(ipNets []*net.IPNet, ip net.IP) bool {
 	for _, ipNet := range ipNets {
 		if ipNet.Contains(ip) {
--- a/backend/internal/utils/ip_util_test.go
+++ b/backend/internal/utils/ip_util_test.go
@@ -1,8 +1,14 @@
 package utils

 import (
+	"context"
 	"net"
+	"net/url"
 	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"

 	"github.com/pocket-id/pocket-id/backend/internal/common"
 )
@@ -20,9 +26,8 @@ func TestIsLocalhostIP(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := IsLocalhostIP(ip); got != tt.expected {
-			t.Errorf("IsLocalhostIP(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+		got := IsLocalhostIP(ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

@@ -40,9 +45,8 @@ func TestIsPrivateLanIP(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := IsPrivateLanIP(ip); got != tt.expected {
-			t.Errorf("IsPrivateLanIP(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+		got := IsPrivateLanIP(ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

@@ -59,9 +63,9 @@ func TestIsTailscaleIP(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := IsTailscaleIP(ip); got != tt.expected {
-			t.Errorf("IsTailscaleIP(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+
+		got := IsTailscaleIP(ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

@@ -86,16 +90,17 @@ func TestIsLocalIPv6(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := IsLocalIPv6(ip); got != tt.expected {
-			t.Errorf("IsLocalIPv6(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+		got := IsLocalIPv6(ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

 func TestIsPrivateIP(t *testing.T) {
 	// Save and restore env config
 	origRanges := common.EnvConfig.LocalIPv6Ranges
-	defer func() { common.EnvConfig.LocalIPv6Ranges = origRanges }()
+	t.Cleanup(func() {
+		common.EnvConfig.LocalIPv6Ranges = origRanges
+	})

 	common.EnvConfig.LocalIPv6Ranges = "fd00::/8"
 	localIPv6Ranges = nil // reset
@@ -115,9 +120,8 @@ func TestIsPrivateIP(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := IsPrivateIP(ip); got != tt.expected {
-			t.Errorf("IsPrivateIP(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+		got := IsPrivateIP(ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

@@ -138,22 +142,202 @@ func TestListContainsIP(t *testing.T) {

 	for _, tt := range tests {
 		ip := net.ParseIP(tt.ip)
-		if got := listContainsIP(list, ip); got != tt.expected {
-			t.Errorf("listContainsIP(%s) = %v, want %v", tt.ip, got, tt.expected)
-		}
+		got := listContainsIP(list, ip)
+		assert.Equal(t, tt.expected, got)
 	}
 }

 func TestInit_LocalIPv6Ranges(t *testing.T) {
 	// Save and restore env config
 	origRanges := common.EnvConfig.LocalIPv6Ranges
-	defer func() { common.EnvConfig.LocalIPv6Ranges = origRanges }()
+	t.Cleanup(func() {
+		common.EnvConfig.LocalIPv6Ranges = origRanges
+	})

 	common.EnvConfig.LocalIPv6Ranges = "fd00::/8, invalidCIDR ,fc00::/7"
 	localIPv6Ranges = nil
 	loadLocalIPv6Ranges()

-	if len(localIPv6Ranges) != 2 {
-		t.Errorf("expected 2 valid IPv6 ranges, got %d", len(localIPv6Ranges))
+	assert.Len(t, localIPv6Ranges, 2)
+}
+
+func TestIsURLPrivate(t *testing.T) {
+	ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+	defer cancel()
+
+	tests := []struct {
+		name        string
+		urlStr      string
+		expectPriv  bool
+		expectError bool
+	}{
+		{
+			name:        "localhost by name",
+			urlStr:      "http://localhost",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "localhost with port",
+			urlStr:      "http://localhost:8080",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "127.0.0.1 IP",
+			urlStr:      "http://127.0.0.1",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "127.0.0.1 with port",
+			urlStr:      "http://127.0.0.1:3000",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "IPv6 loopback",
+			urlStr:      "http://[::1]",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "IPv6 loopback with port",
+			urlStr:      "http://[::1]:8080",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "private IP 10.x.x.x",
+			urlStr:      "http://10.0.0.1",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "private IP 192.168.x.x",
+			urlStr:      "http://192.168.1.1",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "private IP 172.16.x.x",
+			urlStr:      "http://172.16.0.1",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "Tailscale IP",
+			urlStr:      "http://100.64.0.1",
+			expectPriv:  true,
+			expectError: false,
+		},
+		{
+			name:        "public IP - Google DNS",
+			urlStr:      "http://8.8.8.8",
+			expectPriv:  false,
+			expectError: false,
+		},
+		{
+			name:        "public IP - Cloudflare DNS",
+			urlStr:      "http://1.1.1.1",
+			expectPriv:  false,
+			expectError: false,
+		},
+		{
+			name:        "invalid hostname",
+			urlStr:      "http://this-should-not-resolve-ever-123456789.invalid",
+			expectPriv:  false,
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u, err := url.Parse(tt.urlStr)
+			require.NoError(t, err, "Failed to parse URL %s", tt.urlStr)
+
+			isPriv, err := IsURLPrivate(ctx, u)
+
+			if tt.expectError {
+				require.Error(t, err, "IsURLPrivate(%s) expected error but got none", tt.urlStr)
+			} else {
+				require.NoError(t, err, "IsURLPrivate(%s) unexpected error", tt.urlStr)
+				assert.Equal(t, tt.expectPriv, isPriv, "IsURLPrivate(%s)", tt.urlStr)
+			}
+		})
 	}
 }
+
+func TestIsURLPrivate_WithDomainName(t *testing.T) {
+	// Note: These tests rely on actual DNS resolution
+	// They test real public domains to ensure they are not flagged as private
+	ctx, cancel := context.WithTimeout(t.Context(), 10*time.Second)
+	defer cancel()
+
+	tests := []struct {
+		name       string
+		urlStr     string
+		expectPriv bool
+	}{
+		{
+			name:       "Google public domain",
+			urlStr:     "https://www.google.com",
+			expectPriv: false,
+		},
+		{
+			name:       "GitHub public domain",
+			urlStr:     "https://github.com",
+			expectPriv: false,
+		},
+		{
+			// localhost.localtest.me is a well-known domain that resolves to 127.0.0.1
+			name:       "localhost.localtest.me resolves to 127.0.0.1",
+			urlStr:     "http://localhost.localtest.me",
+			expectPriv: true,
+		},
+		{
+			// 10.0.0.1.nip.io resolves to 10.0.0.1 (private IP)
+			name:       "nip.io domain resolving to private 10.x IP",
+			urlStr:     "http://10.0.0.1.nip.io",
+			expectPriv: true,
+		},
+		{
+			// 192.168.1.1.nip.io resolves to 192.168.1.1 (private IP)
+			name:       "nip.io domain resolving to private 192.168.x IP",
+			urlStr:     "http://192.168.1.1.nip.io",
+			expectPriv: true,
+		},
+		{
+			// 127.0.0.1.nip.io resolves to 127.0.0.1 (localhost)
+			name:       "nip.io domain resolving to localhost",
+			urlStr:     "http://127.0.0.1.nip.io",
+			expectPriv: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u, err := url.Parse(tt.urlStr)
+			require.NoError(t, err, "Failed to parse URL %s", tt.urlStr)
+
+			isPriv, err := IsURLPrivate(ctx, u)
+			if err != nil {
+				t.Skipf("DNS resolution failed for %s (network issue?): %v", tt.urlStr, err)
+				return
+			}
+
+			assert.Equal(t, tt.expectPriv, isPriv, "IsURLPrivate(%s)", tt.urlStr)
+		})
+	}
+}
+
+func TestIsURLPrivate_ContextCancellation(t *testing.T) {
+	ctx, cancel := context.WithCancel(t.Context())
+	cancel() // Cancel immediately
+
+	u, err := url.Parse("http://example.com")
+	require.NoError(t, err, "Failed to parse URL")
+
+	_, err = IsURLPrivate(ctx, u)
+	assert.Error(t, err, "IsURLPrivate with cancelled context expected error but got none")
+}
--- a/backend/internal/utils/jwk/key_provider.go
+++ b/backend/internal/utils/jwk/key_provider.go
@@ -28,22 +28,14 @@ func GetKeyProvider(db *gorm.DB, envConfig *common.EnvConfigSchema, instanceID s
 		return nil, fmt.Errorf("failed to load encryption key: %w", err)
 	}

-	// Get the key provider
-	switch envConfig.KeysStorage {
-	case "file", "":
-		keyProvider = &KeyProviderFile{}
-	case "database":
-		keyProvider = &KeyProviderDatabase{}
-	default:
-		return nil, fmt.Errorf("invalid key storage '%s'", envConfig.KeysStorage)
-	}
+	keyProvider = &KeyProviderDatabase{}
 	err = keyProvider.Init(KeyProviderOpts{
 		DB:        db,
 		EnvConfig: envConfig,
 		Kek:       kek,
 	})
 	if err != nil {
-		return nil, fmt.Errorf("failed to init key provider of type '%s': %w", envConfig.KeysStorage, err)
+		return nil, fmt.Errorf("failed to init key provider: %w", err)
 	}

 	return keyProvider, nil
--- a/backend/internal/utils/jwk/key_provider_file.go
+++ b/backend/internal/utils/jwk/key_provider_file.go
@@ -1,202 +0,0 @@
-package jwk
-
-import (
-	"encoding/base64"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/lestrrat-go/jwx/v3/jwk"
-
-	"github.com/pocket-id/pocket-id/backend/internal/common"
-	"github.com/pocket-id/pocket-id/backend/internal/utils"
-	cryptoutils "github.com/pocket-id/pocket-id/backend/internal/utils/crypto"
-)
-
-const (
-	// PrivateKeyFile is the path in the data/keys folder where the key is stored
-	// This is a JSON file containing a key encoded as JWK
-	PrivateKeyFile = "jwt_private_key.json"
-
-	// PrivateKeyFileEncrypted is the path in the data/keys folder where the encrypted key is stored
-	// This is a encrypted JSON file containing a key encoded as JWK
-	PrivateKeyFileEncrypted = "jwt_private_key.json.enc"
-)
-
-type KeyProviderFile struct {
-	envConfig *common.EnvConfigSchema
-	kek       []byte
-}
-
-func (f *KeyProviderFile) Init(opts KeyProviderOpts) error {
-	f.envConfig = opts.EnvConfig
-	f.kek = opts.Kek
-
-	return nil
-}
-
-func (f *KeyProviderFile) LoadKey() (jwk.Key, error) {
-	if len(f.kek) > 0 {
-		return f.loadEncryptedKey()
-	}
-	return f.loadKey()
-}
-
-func (f *KeyProviderFile) SaveKey(key jwk.Key) error {
-	if len(f.kek) > 0 {
-		return f.saveKeyEncrypted(key)
-	}
-	return f.saveKey(key)
-}
-
-func (f *KeyProviderFile) loadKey() (jwk.Key, error) {
-	var key jwk.Key
-
-	// First, check if we have a JWK file
-	// If we do, then we just load that
-	jwkPath := f.jwkPath()
-	ok, err := utils.FileExists(jwkPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check if private key file exists at path '%s': %w", jwkPath, err)
-	}
-	if !ok {
-		// File doesn't exist, no key was loaded
-		return nil, nil
-	}
-
-	data, err := os.ReadFile(jwkPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read private key file at path '%s': %w", jwkPath, err)
-	}
-
-	key, err = jwk.ParseKey(data)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse private key file at path '%s': %w", jwkPath, err)
-	}
-
-	return key, nil
-}
-
-func (f *KeyProviderFile) loadEncryptedKey() (key jwk.Key, err error) {
-	// First, check if we have an encrypted JWK file
-	// If we do, then we just load that
-	encJwkPath := f.encJwkPath()
-	ok, err := utils.FileExists(encJwkPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check if encrypted private key file exists at path '%s': %w", encJwkPath, err)
-	}
-	if ok {
-		encB64, err := os.ReadFile(encJwkPath)
-		if err != nil {
-			return nil, fmt.Errorf("failed to read encrypted private key file at path '%s': %w", encJwkPath, err)
-		}
-
-		// Decode from base64
-		enc := make([]byte, base64.StdEncoding.DecodedLen(len(encB64)))
-		n, err := base64.StdEncoding.Decode(enc, encB64)
-		if err != nil {
-			return nil, fmt.Errorf("failed to read encrypted private key file at path '%s': not a valid base64-encoded file: %w", encJwkPath, err)
-		}
-
-		// Decrypt the data
-		data, err := cryptoutils.Decrypt(f.kek, enc[:n], nil)
-		if err != nil {
-			return nil, fmt.Errorf("failed to decrypt private key file at path '%s': %w", encJwkPath, err)
-		}
-
-		// Parse the key
-		key, err = jwk.ParseKey(data)
-		if err != nil {
-			return nil, fmt.Errorf("failed to parse encrypted private key file at path '%s': %w", encJwkPath, err)
-		}
-
-		return key, nil
-	}
-
-	// Check if we have an un-encrypted JWK file
-	key, err = f.loadKey()
-	if err != nil {
-		return nil, fmt.Errorf("failed to load un-encrypted key file: %w", err)
-	}
-	if key == nil {
-		// No key exists, encrypted or un-encrypted
-		return nil, nil
-	}
-
-	// If we are here, we have loaded a key that was un-encrypted
-	// We need to replace the plaintext key with the encrypted one before we return
-	err = f.saveKeyEncrypted(key)
-	if err != nil {
-		return nil, fmt.Errorf("failed to save encrypted key file: %w", err)
-	}
-	jwkPath := f.jwkPath()
-	err = os.Remove(jwkPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to remove un-encrypted key file at path '%s': %w", jwkPath, err)
-	}
-
-	return key, nil
-}
-
-func (f *KeyProviderFile) saveKey(key jwk.Key) error {
-	err := os.MkdirAll(f.envConfig.KeysPath, 0700)
-	if err != nil {
-		return fmt.Errorf("failed to create directory '%s' for key file: %w", f.envConfig.KeysPath, err)
-	}
-
-	jwkPath := f.jwkPath()
-	keyFile, err := os.OpenFile(jwkPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
-	if err != nil {
-		return fmt.Errorf("failed to create key file at path '%s': %w", jwkPath, err)
-	}
-	defer keyFile.Close()
-
-	// Write the JSON file to disk
-	err = EncodeJWK(keyFile, key)
-	if err != nil {
-		return fmt.Errorf("failed to write key file at path '%s': %w", jwkPath, err)
-	}
-
-	return nil
-}
-
-func (f *KeyProviderFile) saveKeyEncrypted(key jwk.Key) error {
-	err := os.MkdirAll(f.envConfig.KeysPath, 0700)
-	if err != nil {
-		return fmt.Errorf("failed to create directory '%s' for encrypted key file: %w", f.envConfig.KeysPath, err)
-	}
-
-	// Encode the key to JSON
-	data, err := EncodeJWKBytes(key)
-	if err != nil {
-		return fmt.Errorf("failed to encode key to JSON: %w", err)
-	}
-
-	// Encrypt the key then encode to Base64
-	enc, err := cryptoutils.Encrypt(f.kek, data, nil)
-	if err != nil {
-		return fmt.Errorf("failed to encrypt key: %w", err)
-	}
-	encB64 := make([]byte, base64.StdEncoding.EncodedLen(len(enc)))
-	base64.StdEncoding.Encode(encB64, enc)
-
-	// Write to disk
-	encJwkPath := f.encJwkPath()
-	err = os.WriteFile(encJwkPath, encB64, 0600)
-	if err != nil {
-		return fmt.Errorf("failed to write encrypted key file at path '%s': %w", encJwkPath, err)
-	}
-
-	return nil
-}
-
-func (f *KeyProviderFile) jwkPath() string {
-	return filepath.Join(f.envConfig.KeysPath, PrivateKeyFile)
-}
-
-func (f *KeyProviderFile) encJwkPath() string {
-	return filepath.Join(f.envConfig.KeysPath, PrivateKeyFileEncrypted)
-}
-
-// Compile-time interface check
-var _ KeyProvider = (*KeyProviderFile)(nil)
--- a/backend/internal/utils/jwk/key_provider_file_test.go
+++ b/backend/internal/utils/jwk/key_provider_file_test.go
@@ -1,320 +0,0 @@
-package jwk
-
-import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"encoding/base64"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"github.com/lestrrat-go/jwx/v3/jwk"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/pocket-id/pocket-id/backend/internal/common"
-	"github.com/pocket-id/pocket-id/backend/internal/utils"
-	cryptoutils "github.com/pocket-id/pocket-id/backend/internal/utils/crypto"
-)
-
-func TestKeyProviderFile_LoadKey(t *testing.T) {
-	// Generate a test key to use in our tests
-	pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	require.NoError(t, err)
-
-	key, err := jwk.Import(pk)
-	require.NoError(t, err)
-
-	t.Run("LoadKey with no existing key", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		provider := &KeyProviderFile{}
-		err := provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-		})
-		require.NoError(t, err)
-
-		// Load key when none exists
-		loadedKey, err := provider.LoadKey()
-		require.NoError(t, err)
-		assert.Nil(t, loadedKey, "Expected nil key when no key exists")
-	})
-
-	t.Run("LoadKey with no existing key (with kek)", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		provider := &KeyProviderFile{}
-		err = provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-			Kek: makeKEK(t),
-		})
-		require.NoError(t, err)
-
-		// Load key when none exists
-		loadedKey, err := provider.LoadKey()
-		require.NoError(t, err)
-		assert.Nil(t, loadedKey, "Expected nil key when no key exists")
-	})
-
-	t.Run("LoadKey with unencrypted key", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		provider := &KeyProviderFile{}
-		err := provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-		})
-		require.NoError(t, err)
-
-		// Save a key
-		err = provider.SaveKey(key)
-		require.NoError(t, err)
-
-		// Make sure the key file exists
-		keyPath := filepath.Join(tempDir, PrivateKeyFile)
-		exists, err := utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected key file to exist")
-
-		// Load the key
-		loadedKey, err := provider.LoadKey()
-		require.NoError(t, err)
-		assert.NotNil(t, loadedKey, "Expected non-nil key when key exists")
-
-		// Verify the loaded key is the same as the original
-		keyBytes, err := EncodeJWKBytes(key)
-		require.NoError(t, err)
-
-		loadedKeyBytes, err := EncodeJWKBytes(loadedKey)
-		require.NoError(t, err)
-
-		assert.Equal(t, keyBytes, loadedKeyBytes, "Expected loaded key to match original key")
-	})
-
-	t.Run("LoadKey with encrypted key", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		provider := &KeyProviderFile{}
-		err = provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-			Kek: makeKEK(t),
-		})
-		require.NoError(t, err)
-
-		// Save a key (will be encrypted)
-		err = provider.SaveKey(key)
-		require.NoError(t, err)
-
-		// Make sure the encrypted key file exists
-		encKeyPath := filepath.Join(tempDir, PrivateKeyFileEncrypted)
-		exists, err := utils.FileExists(encKeyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected encrypted key file to exist")
-
-		// Make sure the unencrypted key file does not exist
-		keyPath := filepath.Join(tempDir, PrivateKeyFile)
-		exists, err = utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.False(t, exists, "Expected unencrypted key file to not exist")
-
-		// Load the key
-		loadedKey, err := provider.LoadKey()
-		require.NoError(t, err)
-		assert.NotNil(t, loadedKey, "Expected non-nil key when encrypted key exists")
-
-		// Verify the loaded key is the same as the original
-		keyBytes, err := EncodeJWKBytes(key)
-		require.NoError(t, err)
-
-		loadedKeyBytes, err := EncodeJWKBytes(loadedKey)
-		require.NoError(t, err)
-
-		assert.Equal(t, keyBytes, loadedKeyBytes, "Expected loaded key to match original key")
-	})
-
-	t.Run("LoadKey replaces unencrypted key with encrypted key when kek is provided", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		// First, create an unencrypted key
-		providerNoKek := &KeyProviderFile{}
-		err := providerNoKek.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-		})
-		require.NoError(t, err)
-
-		// Save an unencrypted key
-		err = providerNoKek.SaveKey(key)
-		require.NoError(t, err)
-
-		// Verify unencrypted key exists
-		keyPath := filepath.Join(tempDir, PrivateKeyFile)
-		exists, err := utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected unencrypted key file to exist")
-
-		// Now create a provider with a kek
-		kek := make([]byte, 32)
-		_, err = rand.Read(kek)
-		require.NoError(t, err)
-
-		providerWithKek := &KeyProviderFile{}
-		err = providerWithKek.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-			Kek: kek,
-		})
-		require.NoError(t, err)
-
-		// Load the key - this should convert the unencrypted key to encrypted
-		loadedKey, err := providerWithKek.LoadKey()
-		require.NoError(t, err)
-		assert.NotNil(t, loadedKey, "Expected non-nil key when loading and converting key")
-
-		// Verify the unencrypted key no longer exists
-		exists, err = utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.False(t, exists, "Expected unencrypted key file to be removed")
-
-		// Verify the encrypted key file exists
-		encKeyPath := filepath.Join(tempDir, PrivateKeyFileEncrypted)
-		exists, err = utils.FileExists(encKeyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected encrypted key file to exist after conversion")
-
-		// Verify the key data
-		keyBytes, err := EncodeJWKBytes(key)
-		require.NoError(t, err)
-
-		loadedKeyBytes, err := EncodeJWKBytes(loadedKey)
-		require.NoError(t, err)
-
-		assert.Equal(t, keyBytes, loadedKeyBytes, "Expected loaded key to match original key after conversion")
-	})
-}
-
-func TestKeyProviderFile_SaveKey(t *testing.T) {
-	// Generate a test key to use in our tests
-	pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	require.NoError(t, err)
-
-	key, err := jwk.Import(pk)
-	require.NoError(t, err)
-
-	t.Run("SaveKey unencrypted", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		provider := &KeyProviderFile{}
-		err := provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-		})
-		require.NoError(t, err)
-
-		// Save the key
-		err = provider.SaveKey(key)
-		require.NoError(t, err)
-
-		// Verify the key file exists
-		keyPath := filepath.Join(tempDir, PrivateKeyFile)
-		exists, err := utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected key file to exist")
-
-		// Verify the content of the key file
-		data, err := os.ReadFile(keyPath)
-		require.NoError(t, err)
-
-		parsedKey, err := jwk.ParseKey(data)
-		require.NoError(t, err)
-
-		// Compare the saved key with the original
-		keyBytes, err := EncodeJWKBytes(key)
-		require.NoError(t, err)
-
-		parsedKeyBytes, err := EncodeJWKBytes(parsedKey)
-		require.NoError(t, err)
-
-		assert.Equal(t, keyBytes, parsedKeyBytes, "Expected saved key to match original key")
-	})
-
-	t.Run("SaveKey encrypted", func(t *testing.T) {
-		tempDir := t.TempDir()
-
-		// Generate a 64-byte kek
-		kek := makeKEK(t)
-
-		provider := &KeyProviderFile{}
-		err = provider.Init(KeyProviderOpts{
-			EnvConfig: &common.EnvConfigSchema{
-				KeysPath: tempDir,
-			},
-			Kek: kek,
-		})
-		require.NoError(t, err)
-
-		// Save the key (will be encrypted)
-		err = provider.SaveKey(key)
-		require.NoError(t, err)
-
-		// Verify the encrypted key file exists
-		encKeyPath := filepath.Join(tempDir, PrivateKeyFileEncrypted)
-		exists, err := utils.FileExists(encKeyPath)
-		require.NoError(t, err)
-		assert.True(t, exists, "Expected encrypted key file to exist")
-
-		// Verify the unencrypted key file doesn't exist
-		keyPath := filepath.Join(tempDir, PrivateKeyFile)
-		exists, err = utils.FileExists(keyPath)
-		require.NoError(t, err)
-		assert.False(t, exists, "Expected unencrypted key file to not exist")
-
-		// Manually decrypt the encrypted key file to verify it contains the correct key
-		encB64, err := os.ReadFile(encKeyPath)
-		require.NoError(t, err)
-
-		// Decode from base64
-		enc := make([]byte, base64.StdEncoding.DecodedLen(len(encB64)))
-		n, err := base64.StdEncoding.Decode(enc, encB64)
-		require.NoError(t, err)
-		enc = enc[:n] // Trim any padding
-
-		// Decrypt the data
-		data, err := cryptoutils.Decrypt(kek, enc, nil)
-		require.NoError(t, err)
-
-		// Parse the key
-		parsedKey, err := jwk.ParseKey(data)
-		require.NoError(t, err)
-
-		// Compare the decrypted key with the original
-		keyBytes, err := EncodeJWKBytes(key)
-		require.NoError(t, err)
-
-		parsedKeyBytes, err := EncodeJWKBytes(parsedKey)
-		require.NoError(t, err)
-
-		assert.Equal(t, keyBytes, parsedKeyBytes, "Expected decrypted key to match original key")
-	})
-}
-
-func makeKEK(t *testing.T) []byte {
-	t.Helper()
-
-	// Generate a 32-byte kek
-	kek := make([]byte, 32)
-	_, err := rand.Read(kek)
-	require.NoError(t, err)
-	return kek
-}
--- a/backend/internal/utils/servicerunner.go
+++ b/backend/internal/utils/servicerunner.go
@@ -38,6 +38,7 @@ func (r *ServiceRunner) Run(ctx context.Context) error {

 			// Ignore context canceled errors here as they generally indicate that the service is stopping
 			if rErr != nil && !errors.Is(rErr, context.Canceled) {
+				cancel()
 				errCh <- rErr
 				return
 			}
--- a/backend/internal/utils/servicerunner_test.go
+++ b/backend/internal/utils/servicerunner_test.go
@@ -61,6 +61,26 @@ func TestServiceRunner_Run(t *testing.T) {
 		require.ErrorIs(t, err, expectedErr)
 	})

+	t.Run("service error cancels others", func(t *testing.T) {
+		expectedErr := errors.New("boom")
+		errorService := func(ctx context.Context) error {
+			return expectedErr
+		}
+		waitingService := func(ctx context.Context) error {
+			<-ctx.Done()
+			return ctx.Err()
+		}
+
+		runner := NewServiceRunner(errorService, waitingService)
+
+		ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+		defer cancel()
+
+		err := runner.Run(ctx)
+		require.Error(t, err)
+		require.ErrorIs(t, err, expectedErr)
+	})
+
 	t.Run("context canceled", func(t *testing.T) {
 		// Create a service that waits until context is canceled
 		waitingService := func(ctx context.Context) error {
--- a/backend/internal/utils/sleep_util.go
+++ b/backend/internal/utils/sleep_util.go
@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"context"
+	"time"
+)
+
+func SleepWithContext(ctx context.Context, delay time.Duration) error {
+	if delay <= 0 {
+		return nil
+	}
+	timer := time.NewTimer(delay)
+	defer timer.Stop()
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-timer.C:
+		return nil
+	}
+}
--- a/backend/internal/utils/stream_util.go
+++ b/backend/internal/utils/stream_util.go
@@ -0,0 +1,34 @@
+package utils
+
+import (
+	"errors"
+	"io"
+)
+
+var ErrSizeExceeded = errors.New("stream size exceeded")
+
+// LimitReader is like io.LimitReader but throws an error if the stream exceeds the max size
+// io.LimitReader instead just returns io.EOF
+// Adapted from https://github.com/golang/go/issues/51115#issuecomment-1079761212
+type LimitReader struct {
+	io.ReadCloser
+	N int64
+}
+
+func NewLimitReader(r io.ReadCloser, limit int64) *LimitReader {
+	return &LimitReader{r, limit}
+}
+
+func (r *LimitReader) Read(p []byte) (n int, err error) {
+	if r.N <= 0 {
+		return 0, ErrSizeExceeded
+	}
+
+	if int64(len(p)) > r.N {
+		p = p[0:r.N]
+	}
+
+	n, err = r.ReadCloser.Read(p)
+	r.N -= int64(n)
+	return
+}
--- a/backend/internal/utils/string_util.go
+++ b/backend/internal/utils/string_util.go
@@ -14,6 +14,17 @@ import (
 // GenerateRandomAlphanumericString generates a random alphanumeric string of the given length
 func GenerateRandomAlphanumericString(length int) (string, error) {
 	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	return GenerateRandomString(length, charset)
+}
+
+// GenerateRandomUnambiguousString generates a random string of the given length using unambiguous characters
+func GenerateRandomUnambiguousString(length int) (string, error) {
+	const charset = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789"
+	return GenerateRandomString(length, charset)
+}
+
+// GenerateRandomString generates a random string of the given length using the provided character set
+func GenerateRandomString(length int, charset string) (string, error) {

 	if length <= 0 {
 		return "", errors.New("length must be a positive integer")
--- a/backend/internal/utils/string_util_test.go
+++ b/backend/internal/utils/string_util_test.go
@@ -2,6 +2,7 @@ package utils

 import (
 	"regexp"
+	"strings"
 	"testing"
 )

@@ -49,6 +50,77 @@ func TestGenerateRandomAlphanumericString(t *testing.T) {
 	})
 }

+func TestGenerateRandomUnambiguousString(t *testing.T) {
+	t.Run("valid length returns correct string", func(t *testing.T) {
+		const length = 10
+		str, err := GenerateRandomUnambiguousString(length)
+
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+		if len(str) != length {
+			t.Errorf("Expected length %d, got %d", length, len(str))
+		}
+
+		matched, err := regexp.MatchString(`^[abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789]+$`, str)
+		if err != nil {
+			t.Errorf("Regex match failed: %v", err)
+		}
+		if !matched {
+			t.Errorf("String contains ambiguous characters: %s", str)
+		}
+	})
+
+	t.Run("zero length returns error", func(t *testing.T) {
+		_, err := GenerateRandomUnambiguousString(0)
+		if err == nil {
+			t.Error("Expected error for zero length, got nil")
+		}
+	})
+
+	t.Run("negative length returns error", func(t *testing.T) {
+		_, err := GenerateRandomUnambiguousString(-1)
+		if err == nil {
+			t.Error("Expected error for negative length, got nil")
+		}
+	})
+}
+
+func TestGenerateRandomString(t *testing.T) {
+	t.Run("valid length returns characters from charset", func(t *testing.T) {
+		const length = 20
+		const charset = "abc"
+		str, err := GenerateRandomString(length, charset)
+
+		if err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+		if len(str) != length {
+			t.Errorf("Expected length %d, got %d", length, len(str))
+		}
+
+		for _, r := range str {
+			if !strings.ContainsRune(charset, r) {
+				t.Fatalf("String contains character outside charset: %q", r)
+			}
+		}
+	})
+
+	t.Run("zero length returns error", func(t *testing.T) {
+		_, err := GenerateRandomString(0, "abc")
+		if err == nil {
+			t.Error("Expected error for zero length, got nil")
+		}
+	})
+
+	t.Run("negative length returns error", func(t *testing.T) {
+		_, err := GenerateRandomString(-1, "abc")
+		if err == nil {
+			t.Error("Expected error for negative length, got nil")
+		}
+	})
+}
+
 func TestCapitalizeFirstLetter(t *testing.T) {
 	tests := []struct {
 		name     string
--- a/backend/resources/aaguids.json
+++ b/backend/resources/aaguids.json
--- a/backend/resources/e2e-tests/database.json
+++ b/backend/resources/e2e-tests/database.json
@@ -0,0 +1 @@
+../../../tests/database.json
--- a/backend/resources/files_test.go
+++ b/backend/resources/files_test.go
@@ -0,0 +1,72 @@
+package resources
+
+import (
+	"embed"
+	"slices"
+	"strconv"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// This test is meant to enforce that for every new migration added, a file with the same migration number exists for all supported databases
+// This is necessary to ensure import/export works correctly
+// Note: if a migration is not needed for a database, ensure there's a file with an empty (no-op) migration (e.g. even just a comment)
+func TestMigrationsMatchingVersions(t *testing.T) {
+	// We can ignore migrations with version below 20251115000000
+	const ignoreBefore = 20251115000000
+
+	// Scan postgres migrations
+	postgresMigrations := scanMigrations(t, FS, "migrations/postgres", ignoreBefore)
+
+	// Scan sqlite migrations
+	sqliteMigrations := scanMigrations(t, FS, "migrations/sqlite", ignoreBefore)
+
+	// Sort both lists for consistent comparison
+	slices.Sort(postgresMigrations)
+	slices.Sort(sqliteMigrations)
+
+	// Compare the lists
+	assert.Equal(t, postgresMigrations, sqliteMigrations, "Migration versions must match between Postgres and SQLite")
+}
+
+// scanMigrations scans a directory for migration files and returns a list of versions
+func scanMigrations(t *testing.T, fs embed.FS, dir string, ignoreBefore int64) []int64 {
+	t.Helper()
+
+	entries, err := fs.ReadDir(dir)
+	require.NoErrorf(t, err, "Failed to read directory '%s'", dir)
+
+	// Divide by 2 because of up and down files
+	versions := make([]int64, 0, len(entries)/2)
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+
+		filename := entry.Name()
+
+		// Only consider .up.sql files
+		if !strings.HasSuffix(filename, ".up.sql") {
+			continue
+		}
+
+		// Extract version from filename (format: <version>_<anything>.up.sql)
+		versionString, _, ok := strings.Cut(filename, "_")
+		require.Truef(t, ok, "Migration file has unexpected format: %s", filename)
+
+		version, err := strconv.ParseInt(versionString, 10, 64)
+		require.NoErrorf(t, err, "Failed to parse version from filename '%s'", filename)
+
+		// Exclude migrations with version below ignoreBefore
+		if version < ignoreBefore {
+			continue
+		}
+
+		versions = append(versions, version)
+	}
+
+	return versions
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Elias Schneider	f42ba3bbef	release: 2.0.1	2026-01-02 23:50:35 +01:00
Elias Schneider	2341da99e9	fix: restore old input input field size	2026-01-02 23:49:41 +01:00
Elias Schneider	2cce200892	fix: admins imported from LDAP lose admin privileges	2026-01-02 23:42:25 +01:00
Elias Schneider	cd2e9f3a2a	chore(docker): bump image tag to `v2`	2026-01-02 19:21:58 +01:00
Elias Schneider	f5e2c68ba3	release: 2.0.0	2026-01-02 19:07:32 +01:00
Elias Schneider	651b58aee6	chore(translations): update translations via Crowdin (#1184 )	2026-01-02 18:55:58 +01:00
Elias Schneider	ffb2ef91bd	tests: change translation string in e2e tests	2026-01-02 18:46:57 +01:00
Elias Schneider	4776b70d96	chore: upgrade dependencies	2026-01-02 17:55:24 +01:00
Elias Schneider	579cfdc678	feat: add support for SCIM provisioning (#1182 )	2026-01-02 17:54:20 +01:00
Elias Schneider	e4a8ca476c	refactor: run formatter	2026-01-02 17:45:53 +01:00
Kyle Mendell	386add08c4	refactor: update forms and other areas to use new shadcn components (#1115 ) Co-authored-by: Elias Schneider <login@eliasschneider.com> Co-authored-by: ItalyPaleAle <43508+ItalyPaleAle@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>	2026-01-02 17:45:08 +01:00
Elias Schneider	894eaf3cff	fix(translations): add missing translations to date picker	2026-01-02 15:57:50 +01:00
Elias Schneider	d9e7bf9eef	fix: remove ambiguous characters from login code	2026-01-02 15:48:46 +01:00
Elias Schneider	b19d901618	chore(translations): update translations via Crowdin (#1181 )	2026-01-01 16:56:11 +01:00
Kyle Mendell	0b625a9707	chore(deps): bump pnpm to version 10.27.0 (#1183 )	2026-01-01 16:55:54 +01:00
Elias Schneider	e60b80632f	chore: preparation for merge into main branch	2025-12-30 17:01:22 +01:00
Elias Schneider	078152d4db	fix!: make wildcard matching in callback URLs more stricter (#1161 )	2025-12-30 17:01:22 +01:00
Kyle Mendell	ba2f0f18f4	feat: remove DbProvider env variable and calculate it dynamically (#1114 )	2025-12-30 17:01:22 +01:00
Elias Schneider	3420a00073	feat: add CLI command for importing and exporting Pocket ID data (#998 ) Co-authored-by: Alessandro (Ale) Segala <43508+ItalyPaleAle@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>	2025-12-30 17:01:22 +01:00
Elias Schneider	f0144584af	feat!: drop support for storing JWK on the filesystem (#1088 )	2025-12-30 17:01:22 +01:00
Elias Schneider	e1c5021eee	fix!: rename `LDAP_ATTRIBUTE_ADMIN_GROUP` env variable to `LDAP_ADMIN_GROUP_NAME` (#1089 )	2025-12-30 17:01:22 +01:00
Elias Schneider	c0e490c28f	chore(translations): update translations via Crowdin (#1167 )	2025-12-29 09:03:44 -06:00
github-actions[bot]	3c98c98fe3	chore: update AAGUIDs (#1177 ) Co-authored-by: stonith404 <58886915+stonith404@users.noreply.github.com>	2025-12-29 09:03:25 -06:00
Elias Schneider	1bc9f5f7e7	feat: add "restricted" column to oidc client table	2025-12-24 14:05:37 +01:00
Elias Schneider	461293ba1d	ci/cd: remove `breaking/**` push trigger from actions	2025-12-24 11:45:15 +01:00
Elias Schneider	7c5ffbf9a5	chore(translations): update translations via Crowdin (#1134 )	2025-12-24 11:42:35 +01:00
Elias Schneider	f75cef83d5	feat: restrict oidc clients by user groups per default (#1164 )	2025-12-24 09:09:25 +01:00
Jenic Rycr	e358c433f0	feat: allow audit log retention to be controlled by env variable (#1158 )	2025-12-23 13:50:00 +01:00
Elias Schneider	08e4ffeb60	feat: minor redesign of auth pages	2025-12-22 21:36:23 +01:00
Elias Schneider	59ca6b26ac	feat: add ability define user groups for sign up tokens (#1155 )	2025-12-21 18:26:52 +01:00
Melvin Snijders	f5da11b99b	feat: add email logo customization (#1150 )	2025-12-17 16:20:22 +01:00
Elias Schneider	3eaf36aae7	fix: restrict email one time sign in token to same browser (#1144 )	2025-12-12 14:51:07 +01:00
Masahiro Ono	0a6ff6f84b	fix(translations): add Japanese locale to inlang settings (#1142 )	2025-12-10 16:43:31 +01:00
Elias Schneider	edb32d82b2	chore: fix type error after version bump	2025-12-10 16:41:59 +01:00
Elias Schneider	90f555f7c1	chore: upgrade dependencies	2025-12-10 16:13:24 +01:00
github-actions[bot]	177ada10ba	chore: update AAGUIDs (#1140 ) Co-authored-by: stonith404 <58886915+stonith404@users.noreply.github.com>	2025-12-07 19:41:51 -06:00
Elias Schneider	91b0d74c43	feat: add HTTP `HEAD` method support (#1135 )	2025-12-05 11:17:13 +01:00
Sebastian	3a1dd3168e	fix(translations): update image format message to include WEBP (#1133 )	2025-12-04 07:58:03 +00:00
Elias Schneider	25f67bd25a	tests: fix api key e2e test	2025-12-03 10:51:19 +01:00
Elias Schneider	e3483a9c78	chore(translations): update translations via Crowdin (#1129 )	2025-12-02 15:17:58 -06:00
github-actions[bot]	95d49256f6	chore: update AAGUIDs (#1128 ) Co-authored-by: stonith404 <58886915+stonith404@users.noreply.github.com>	2025-11-30 19:00:53 +01:00
Elias Schneider	8cddcb88e8	release: 1.16.0	2025-11-30 18:30:29 +01:00
Elias Schneider	a25d6ef56c	feat: add `Cache-Control: private, no-store` to all API routes per default (#1126 )	2025-11-30 18:29:35 +01:00
Elias Schneider	14c7471b52	refactor: run formatter	2025-11-30 18:17:22 +01:00
Elias Schneider	5d6a7fdb58	fix: hide theme switcher on auth pages because of dynamic background	2025-11-30 18:17:11 +01:00
Elias Schneider	a1cd3251cd	fix: theme mode not correctly applied if selected manually	2025-11-30 18:05:01 +01:00
Elias Schneider	4eeb06f29d	docs: add `ENCRYPTION_KEY` to `.env.example` for breaking change preparation	2025-11-30 13:14:15 +01:00
Elias Schneider	b2c718d13d	ci/cd: fix wrong storage value	2025-11-30 13:12:57 +01:00
Elias Schneider	8d30346f64	refactor: rename file backend value `fs` to `filesystem`	2025-11-30 12:56:15 +01:00
Elias Schneider	714b7744f0	chore(translations): update translations via Crowdin (#1123 )	2025-11-30 12:20:35 +01:00
Elias Schneider	d98c0a391a	fix: global audit log user filter not working	2025-11-29 23:15:50 +01:00
Mike Nestor	4fe56a8d5c	chore: update vscode launch.json (#1117 ) Co-authored-by: Elias Schneider <login@eliasschneider.com>	2025-11-29 21:16:25 +01:00
Elias Schneider	cfc9e464d9	fix: automatically create parent directory of Sqlite db	2025-11-29 21:14:23 +01:00
Elias Schneider	3d46badb3c	chore: fix package vulnerabilities	2025-11-27 11:58:44 +01:00
Elias Schneider	f523f39483	tests: fix Dutch validation message	2025-11-25 22:51:20 +01:00
Elias Schneider	4bde271b47	chore: upgrade dependencies	2025-11-25 22:30:28 +01:00
Elias Schneider	a3c968758a	feat: add option to disable S3 integrity check	2025-11-25 22:14:44 +01:00
Elias Schneider	ca888b3dd2	chore(translations): add Finish files	2025-11-25 20:46:48 +01:00
Elias Schneider	ce88686c5f	chore(translations): update translations via Crowdin (#1111 )	2025-11-25 20:43:47 +01:00
Elias Schneider	a9b6635126	chore(translations): update translations via Crowdin (#1101 )	2025-11-23 17:10:24 +01:00
dependabot[bot]	e817f042ec	chore(deps): bump golang.org/x/crypto from 0.43.0 to 0.45.0 in /backend in the go_modules group across 1 directory (#1107 ) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2025-11-23 17:10:10 +01:00
Alessandro (Ale) Segala	c56afe016e	feat: adding/removing passkeys creates an entry in audit logs (#1099 ) Co-authored-by: Elias Schneider <login@eliasschneider.com>	2025-11-16 14:51:38 -08:00
Alessandro (Ale) Segala	a54b867105	refactor: use constants for AppEnv values (#1098 )	2025-11-16 18:25:06 +01:00
Alessandro (Ale) Segala	29a1d3b778	feat: add database storage backend (#1091 ) Co-authored-by: Elias Schneider <login@eliasschneider.com>	2025-11-16 18:23:46 +01:00
Elias Schneider	12125713a2	feat: add support for WEBP profile pictures (#1090 )	2025-11-11 10:56:20 -06:00
Elias Schneider	ab9c0f9ac0	ci/cd: run checks on PR to `breaking/**` branches	2025-11-11 11:21:39 +01:00
@@ -1 +1 @@
 .15.0
 .0.1