diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index 57c1e04..0000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "root": true,
-  "env": {
-    "browser": true,
-    "es2022": true
-  },
-  "parserOptions": {
-    "ecmaVersion": 2022,
-    "sourceType": "script"
-  },
-  "globals": {
-    "Alpine": "readonly",
-    "htmx": "readonly",
-    "Sortable": "readonly",
-    "window": "readonly",
-    "document": "readonly",
-    "localStorage": "readonly",
-    "confirm": "readonly",
-    "fetch": "readonly",
-    "navigator": "readonly",
-    "setTimeout": "readonly",
-    "setInterval": "readonly",
-    "history": "readonly",
-    "Location": "readonly",
-    "URLSearchParams": "readonly",
-    "location": "readonly"
-  },
-  "rules": {
-    "no-unused-vars": ["warn", { "args": "none" }],
-    "no-undef": "error",
-    "no-extra-semi": "warn",
-    "no-empty": "warn"
-  },
-  "overrides": [
-    {
-      "files": ["static/js/**/*.js"],
-      "rules": {
-        "no-undef": "warn"
-      }
-    }
-  ],
-  "ignorePatterns": ["static/js/*.min.js", "static/js/vendor/**"]
-}
\ No newline at end of file
diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 09f4fea..f5d75f9 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -1,12 +1,26 @@
 name: FlowDeck CI
 
 on:
+  # Run on every pushed branch so feature branches are validated before the PR.
   push:
-    branches: [main]
   pull_request:
-    branches: [main]
+    branches: [main, develop]
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install lint tools
+        run: pip install -r requirements-dev.txt
+      - name: Ruff (Python)
+        run: ruff check app tests
+      - name: ESLint (JavaScript)
+        run: npx --yes eslint static/js
+
   test:
     runs-on: ubuntu-latest
     # NOTE: no `container:` here. A `python:*-slim` image ships no Node.js, so the
@@ -19,7 +33,7 @@ jobs:
         with:
           python-version: '3.12'
       - name: Install system dependencies (WeasyPrint / emoji fonts)
-        run: |
+        run: |-
           SUDO=""
           if command -v sudo >/dev/null 2>&1; then SUDO="sudo"; fi
           $SUDO apt-get update
@@ -27,13 +41,14 @@ jobs:
             libpango-1.0-0 libpangoft2-1.0-0 libharfbuzz0b libffi-dev \
             libjpeg-dev libopenjp2-7 libcairo2 fonts-noto-color-emoji
       - name: Install Python dependencies
-        run: pip install -r requirements.txt pytest pytest-cov
-      - name: Run tests with coverage
+        run: pip install -r requirements-dev.txt pytest-cov
+      - name: Run tests (parallel) with coverage
         env:
           GITEA_URL: https://git.dracodev.net
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
           APP_SECRET_KEY: ci-test-key
-        run: python -m pytest tests/ -v --tb=short --cov=app --cov-report=term
+        # `-n auto` needs pytest-xdist, provided by requirements-dev.txt.
+        run: python -m pytest tests/ -v --tb=short -n auto --cov=app --cov-report=term
       - name: Coverage summary
         if: always()
         run: coverage report -m || true
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3410c9..aa3175c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,35 @@
 # Changelog - FlowDeck
 
+## v5.11.1 (2026-09-11) — v5.2.0 Infrastructure & Polish (complétion)
+
+> Finalise le chantier v5.2.0 : la plupart des briques étaient déjà livrées
+> (design tokens/components, API tokens, sessions, onboarding, backups, projets +
+> sync, GitHubAdapter, Docker multi-stage) ; ce patch sécurise l'isolation des
+> tests, active les tests parallèles et rend le linting vert.
+
+- **Tests parallèles (pytest-xdist)** — `tests/conftest.py` **mute** désormais le
+  singleton `app.config.settings` au lieu de le remplacer. Les modules qui
+  importaient `settings` au chargement (ex. `app/services/backup.py`) gardaient
+  sinon les valeurs par défaut, ce qui rendait les tests backup instables. Chaque
+  test a une base SQLite temporaire + un dossier de backup dédiés → tests
+  parallèles lancés explicitement (`pytest -n auto` en local et en CI). La config
+  de base ne force plus `-n` (évite l'échec `unrecognized arguments: -n` si
+  `pytest-xdist` n'est pas installé).
+- **Backups réellement testés** — les 2 tests précédemment `skip` (flaky) sont
+  remplacés par des tests réels : snapshot daté, `prune_old_backups`, `backup_due`
+  et API admin `/api/settings/backups`.
+- **OAuth (mock)** — tests d'intégration complets dans `tests/test_v52_infra.py` :
+  redirect authorize → callback (Gitea + GitHub), mode `link` sur un compte local,
+  rejet d'un `state` invalide, construction des URLs d'autorisation.
+- **Schéma complet hors lifespan** — `init_db()` crée aussi
+  `webhook_subscriptions` (auparavant uniquement dans le lifespan FastAPI).
+- **Linting** — `ruff check app tests` passe sans erreur (corrections E701/E702,
+  B904, B007, E741, F821, F841, W293, UP031, E731 + config FastAPI pour B008) ;
+  migration de `.eslintrc.json` vers `eslint.config.mjs` (flat config, ESLint v9+).
+- **CI** — nouveau job `lint` (ruff + eslint) ; tests exécutés en parallèle avec
+  couverture ; déclencheurs élargis à `develop`.
+- **Version** — 5.11.1. **397 tests** verts.
+
 ## v5.11.0 (2026-09-11) — FlowDeck Agent : UX chat améliorée
 
 > Quatre améliorations majeures du panneau Agent (v4.10.0 → v4.14.0) pour
diff --git a/ROADMAP.md b/ROADMAP.md
index 4c66e8f..d72bdc8 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -437,40 +437,44 @@ app/
 - [x] Hooks événements dans collections.py / board.py / workspace.py (apply_page_template)
 - [x] **11 tests** `tests/test_automations.py` ; suite complète 289 verte
 
-### v5.2.0 — Infrastructure & Polish 🔄 (en cours)
-> ✅ **Priorité n°1 livrée** : les **migrations versionnées** (voir `app/migrations.py` +
-> table `schema_version`) — la base comptait 30+ tables créées ad-hoc ; tout nouveau
-> schéma passe désormais par des étapes versionnées (baseline v1, indexes v2, FTS5 v3).
-> **État actuel** : API publique + tokens **partiellement implémentés** (`routers/public_api.py`,
-> test `test_public_api_token`) — à compléter dans la section Sécurité.
+### v5.2.0 — Infrastructure & Polish ✅ (2026-09-11)
+> **Objectif** : fondations de production — design system, sécurité, infra, forge.
+> **COMPLETED**.
 
 **Design system**
-- [ ] **Design tokens** — `design-tokens.css` (couleurs, espacements, typographie unifiés)
-- [ ] **Composants réutilisables** — boutons, inputs, modales, dropdowns, toasts
+- [x] **Design tokens** — `static/css/design-tokens.css` (couleurs, espacements, typo, ombres, z-index) chargé après `app.css`
+- [x] **Composants réutilisables** — `static/css/components.css` (btn/input/modal/dropdown/toast/card/badge/empty/table)
 
 **Sécurité & Utilisateur**
-- [ ] **API Tokens** — générer/révoquer des clés API utilisateur *(PARTIEL : `public_api.py` + tokens existent, manque la gestion UI dans Settings)*
-- [ ] **Sessions actives** — voir et révoquer les sessions
-- [ ] **Onboarding wizard** — `/welcome` au premier lancement (créer compte → lier forges → premier projet)
+- [x] **API Tokens** — générer/lister/révoquer dans Settings → API tokens (`app/routers/security.py`, table `api_tokens`, bearer `/api/v1`)
+- [x] **Sessions actives** — liste + révocation (`user_sessions`, `SessionManager.list_sessions/revoke_session`)
+- [x] **Onboarding wizard** — `/welcome` (workspace → forge → premier projet) + `welcome.html`
 
 **Infrastructure**
-- [x] **🥇 Migrations versionnées** — table `schema_version` + runner `app/migrations.py` (baseline v1, indexes v2, FTS5 v3) ✅
-- [ ] **Backup automatique** — cron daily → fichier daté
-- [x] **Index manquants** — `users.email`, `user_oauth_tokens(user_id, provider)`, `collections/pages(workspace_id)`, `pages(deleted_at)` ✅
-- [ ] **Linting** — ruff (Python), eslint (JS) *(aucune config actuellement)*
-- [ ] **Tests parallèles** — pytest-xdist
-- [ ] **Build Docker multi-stage** — optimiser taille d'image
+- [x] **🥇 Migrations versionnées** — table `schema_version` + runner `app/migrations.py` (baseline v1, indexes v2, FTS5 v3)
+- [x] **Backup automatique** — snapshot SQLite quotidien (`app/services/backup.py`, scheduler + API admin, rétention configurable)
+- [x] **Index manquants** — `users.email`, `user_oauth_tokens(user_id, provider)`, `collections/pages(workspace_id)`, `pages(deleted_at)`
+- [x] **Linting** — ruff (Python, `pyproject.toml`) + eslint flat (`eslint.config.mjs`) ; `ruff check` et `eslint` sans erreur
+- [x] **Tests parallèles** — pytest-xdist (`pytest -n auto` en local et en CI ; DB + dossier backup isolés par test)
+- [x] **Build Docker multi-stage** — builder + runtime (libs WeasyPrint), image allégée
 
 **Forge integration**
-- [ ] **DB: table `projects`** — type (builtin/gitea/github), forge_id, clone_url, default_branch, language
-- [ ] **Cron: sync périodique des projets** — configurable (défaut: chaque heure)
-- [ ] **GitHubAdapter** complet — API GitHub v3 → interface ForgeAdapter
+- [x] **DB: table `projects`** — type (builtin/gitea/github), forge_id, clone_url, default_branch, language
+- [x] **Cron: sync périodique des projets** — `project_sync_scheduler` (défaut : chaque heure)
+- [x] **GitHubAdapter** complet — API GitHub v3 → interface `ForgeAdapter`
 
 **Tests (cibles)**
-- [x] **267 tests** — 259+ (dont 8 nouveaux migrations/search) ✅
-- [ ] Tests d'intégration auth (OAuth mock)
-- [ ] Tests des adapters forge (mock HTTP)
-- [ ] Tests multi-user (permissions croisées)
+- [x] **397 tests** — dont backups, projets, adapters forge (mock HTTP), OAuth (mock), multi-user ✅
+- [x] Tests d'intégration auth (OAuth mock) — login/callback Gitea + GitHub, mode `link`, rejet d'état invalide
+- [x] Tests des adapters forge (mock HTTP) — `GitHubAdapter` via `httpx.MockTransport`
+- [x] Tests multi-user (permissions croisées) — `PermissionManager` owner/editor/viewer
+
+**Complétion du 2026-09-11** :
+- Isolation des tests corrigée : `tests/conftest.py` **mute** le singleton `settings` (au lieu de le remplacer), sinon les modules ayant importé `settings` au chargement (ex. `backup.py`) gardaient les valeurs par défaut → backups flaky. DB temporaire unique par test, sûr en xdist.
+- Backups réellement testés (snapshot + prune + API admin) : les 2 skips supprimés.
+- `init_db()` crée désormais aussi `webhook_subscriptions` (schéma complet sans dépendre du lifespan FastAPI).
+- Tests OAuth mock (flux complet) ajoutés dans `tests/test_v52_infra.py`.
+- CI : job `lint` (ruff + eslint) + tests parallèles.
 
 ### v5.3.0 — Database Avancée ✅ (2026-09-06)
 > **Objectif** : databases inline + templates prédéfinis + validation propriétés. **COMPLETED**.
@@ -616,11 +620,12 @@ app/
 
 ## 🎯 Ordre de priorité recommandé (état 2026-09)
 
-1. ~~**v5.2.0 → Migrations versionnées**~~ ✅ livré (`schema_version` + `app/migrations.py`)
+1. ~~**v5.2.0 → Infrastructure & Polish**~~ ✅ livré (design tokens/components, API tokens, sessions, onboarding, backups, projets + sync, GitHubAdapter, lint ruff/eslint, tests parallèles, Docker multi-stage)
 2. ~~**v5.0.0 → Command palette + FTS5**~~ ✅ livré (palette Ctrl+K + `GET /api/search`)
 3. ~~**v5.3.0 → Inline databases + templates + validation**~~ ✅ livré (slash `/database`, 6 templates, validation propriétés)
-1. ~~**v5.13.0 → Realtime (WS + présence)**~~ ✅ livré (`app/services/realtime_server.py` + `WS /ws/pages/{id}`, présence, curseurs live, merge LWW, 12 tests)
-2. ~~**v5.10.0 → Interactions de bloc**~~ ✅ livré (drag&drop multi, undo/redo, duplicate, menu ⋮, en-têtes de tableau, 9 tests)
+4. ~~**v5.13.0 → Realtime (WS + présence)**~~ ✅ livré (`app/services/realtime_server.py` + `WS /ws/pages/{id}`, présence, curseurs live, merge LWW, 12 tests)
+5. ~~**v5.10.0 → Interactions de bloc**~~ ✅ livré (drag&drop multi, undo/redo, duplicate, menu ⋮, en-têtes de tableau, 9 tests)
+6. **v5.4.0 → Expérience éditeur** — backlinks, duplicate, corbeille globale, historique de version UI, import (prochain)
 ---
 
 ## Résumé des phases
@@ -639,4 +644,4 @@ Quality      DB views,      Agent IA     Palette →       Realtime +          S
                                           DB avancée,    redo, drag&drop,
                                           Calendrier, AI duplicate)
 
-*Dernière mise à jour: 2026-09-10 — v5.9.0 AI Writing Assist livré (slash `/ai`, autocomplétion `AIAC`, AI properties, service `ai_writing.py`, 2 endpoints, 29 tests) ; reste v5.4, v5.11 → v6.0*
+*Dernière mise à jour: 2026-09-11 — v5.2.0 Infrastructure & Polish complété (isolation tests + xdist, backups testés, OAuth mock, lint ruff/eslint vert, CI lint) ; reste v5.4, v5.11 → v6.0*
diff --git a/VERSION b/VERSION
index 57f82f7..32447ce 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.11.0
\ No newline at end of file
+5.11.1
diff --git a/app/auth/__init__.py b/app/auth/__init__.py
index f46c919..e46aff3 100644
--- a/app/auth/__init__.py
+++ b/app/auth/__init__.py
@@ -1,3 +1,5 @@
 """FlowDeck — Auth module: session, OAuth2, dependencies."""
 from app.auth.oauth import GiteaOAuth
 from app.auth.session import SessionManager, get_current_user
+
+__all__ = ["GiteaOAuth", "SessionManager", "get_current_user"]
diff --git a/app/db.py b/app/db.py
index a0fff76..bc3d475 100644
--- a/app/db.py
+++ b/app/db.py
@@ -817,6 +817,11 @@ def init_db():
         from app.migrations import apply_migrations
         apply_migrations(conn)
 
+    # Webhook subscriptions (v2.1.0) — created here (idempotent) so the full
+    # schema exists without depending on the FastAPI lifespan startup.
+    from app.services.webhook_outbound import init_webhook_tables
+    init_webhook_tables()
+
 
 @contextmanager
 def get_conn():
diff --git a/app/main.py b/app/main.py
index ca3f9ac..60c74eb 100644
--- a/app/main.py
+++ b/app/main.py
@@ -85,7 +85,7 @@ async def lifespan(_app: FastAPI):
     from app.services.trash import trash_purge_scheduler
     trash_task = asyncio.create_task(trash_purge_scheduler())
 
-    logger.info("FlowDeck v5.10.0 started on port %d", settings.app_port)
+    logger.info("FlowDeck v5.11.1 started on port %d", settings.app_port)
     try:
         yield
     finally:
@@ -100,7 +100,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="5.10.0",
+    version="5.11.1",
     docs_url="/docs" if settings.log_level == "DEBUG" else None,
     redoc_url=None,
     lifespan=lifespan,
diff --git a/app/middleware/__init__.py b/app/middleware/__init__.py
index aa51a09..f3c8d80 100644
--- a/app/middleware/__init__.py
+++ b/app/middleware/__init__.py
@@ -1,2 +1,4 @@
 """FlowDeck — Custom middleware."""
 from app.middleware.csrf import CSRFMiddleware
+
+__all__ = ["CSRFMiddleware"]
diff --git a/app/routers/agent.py b/app/routers/agent.py
index 148f5cb..9560198 100644
--- a/app/routers/agent.py
+++ b/app/routers/agent.py
@@ -178,7 +178,7 @@ async def create_agent(request: Request):
             )
             conn.commit()
         except Exception as exc:  # noqa: BLE001
-            raise HTTPException(status_code=409, detail=f"Impossible de créer l'agent: {exc}")
+            raise HTTPException(status_code=409, detail=f"Impossible de créer l'agent: {exc}") from exc
     return {"id": cur.lastrowid, "name": name, "status": "created"}
 
 
@@ -466,9 +466,9 @@ async def undo(request: Request, action_id: int):
     try:
         undo_action(action_id)
     except ValueError as exc:
-        raise HTTPException(status_code=400, detail=str(exc))
+        raise HTTPException(status_code=400, detail=str(exc)) from exc
     except Exception as exc:  # noqa: BLE001
-        raise HTTPException(status_code=500, detail=f"Rollback échoué: {exc}")
+        raise HTTPException(status_code=500, detail=f"Rollback échoué: {exc}") from exc
     return {"id": action_id, "status": "reverted"}
 
 
@@ -501,7 +501,7 @@ async def create_skill(request: Request):
             )
             conn.commit()
         except Exception as exc:  # noqa: BLE001
-            raise HTTPException(status_code=409, detail=f"Skill existe déjà: {exc}")
+            raise HTTPException(status_code=409, detail=f"Skill existe déjà: {exc}") from exc
     return {"id": cur.lastrowid, "name": name, "status": "created"}
 
 
diff --git a/app/routers/api.py b/app/routers/api.py
index 43b723e..1d5cdaf 100644
--- a/app/routers/api.py
+++ b/app/routers/api.py
@@ -149,7 +149,7 @@ async def move_card(
                 issue = await gitea.get_issue(owner, repo, issue_id)
                 current_labels = [lbl["name"] for lbl in issue.get("labels", [])]
                 status_labels = await _get_status_labels(owner, repo, board_id)
-                filtered_names = [l for l in current_labels if l not in status_labels]
+                filtered_names = [name for name in current_labels if name not in status_labels]
                 filtered_names.append(mapping["gitea_label"])
 
                 # Resolve label names to IDs
@@ -293,7 +293,7 @@ async def create_issue(
     if not _check_rate_limit(request):
         raise HTTPException(status_code=429, detail="Rate limit exceeded")
 
-    label_ids = [int(l) for l in labels.split(",") if l.strip().isdigit()] if labels else None
+    label_ids = [int(lbl) for lbl in labels.split(",") if lbl.strip().isdigit()] if labels else None
     milestone_id = int(milestone) if milestone.strip().isdigit() else None
 
     issue = await gitea.create_issue(
@@ -345,7 +345,7 @@ async def update_issue_api(
     if state:
         kwargs["state"] = state
     if labels:
-        label_ids = [int(l) for l in labels.split(",") if l.strip().isdigit()]
+        label_ids = [int(lbl) for lbl in labels.split(",") if lbl.strip().isdigit()]
     if milestone and milestone.strip().isdigit():
         kwargs["milestone"] = int(milestone)
     if assignee:
@@ -388,7 +388,7 @@ async def get_issue_detail(owner: str, repo: str, issue_id: int, format: str = Q
         comments = await gitea.get_issue_comments(owner, repo, issue_id)
     except Exception as e:
         logger.warning("Failed to fetch issue %s/%s #%d: %s", owner, repo, issue_id, e)
-        raise HTTPException(status_code=404, detail=f"Issue #{issue_id} not found")
+        raise HTTPException(status_code=404, detail=f"Issue #{issue_id} not found") from e
 
     # Get checklists from local DB
     with get_conn() as conn:
diff --git a/app/routers/automations.py b/app/routers/automations.py
index a3597cf..23d5dd2 100644
--- a/app/routers/automations.py
+++ b/app/routers/automations.py
@@ -53,7 +53,7 @@ def _validate_payload(body: dict) -> None:
             else:
                 json.dumps(val)
         except (TypeError, json.JSONDecodeError):
-            raise HTTPException(status_code=400, detail=f"{key} must be valid JSON")
+            raise HTTPException(status_code=400, detail=f"{key} must be valid JSON") from None
 
 
 @router.get("/workspace/automations")
diff --git a/app/routers/board.py b/app/routers/board.py
index 3a1d55c..5021af3 100644
--- a/app/routers/board.py
+++ b/app/routers/board.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 
 import json
 import logging
+from pathlib import Path
 
 from fastapi import APIRouter, HTTPException, Query, Request
 from fastapi.responses import HTMLResponse, JSONResponse
@@ -150,20 +151,34 @@ def _file_icon(name: str, content_format: str = "") -> str:
     if content_format and content_format != 'file':
         return 'edit'
     n = name.lower()
-    if re.search(r'\.(png|jpe?g|gif|webp|svg|bmp|ico)$', n): return 'image'
-    if n.endswith('.pdf'): return 'file'
-    if re.search(r'\.(md|markdown)$', n): return 'edit'
-    if n.endswith('.py'): return 'file'
-    if re.search(r'\.(js|jsx|ts|tsx)$', n): return 'file'
-    if re.search(r'\.(html?|xml)$', n): return 'file'
-    if n.endswith('.css'): return 'file'
-    if n.endswith('.json'): return 'file'
-    if n.endswith('.sql'): return 'file'
-    if re.search(r'\.(sh|bash|zsh)$', n): return 'file'
-    if n.endswith('.ps1'): return 'file'
-    if re.search(r'\.(rs|go|java|rb|php|c|cpp|h|swift|kt|scala|r)$', n): return 'file'
-    if re.search(r'\.(txt|log)$', n): return 'file'
-    if re.search(r'\.(zip|tar|gz|rar|7z)$', n): return 'file'
+    if re.search(r'\.(png|jpe?g|gif|webp|svg|bmp|ico)$', n):
+        return 'image'
+    if n.endswith('.pdf'):
+        return 'file'
+    if re.search(r'\.(md|markdown)$', n):
+        return 'edit'
+    if n.endswith('.py'):
+        return 'file'
+    if re.search(r'\.(js|jsx|ts|tsx)$', n):
+        return 'file'
+    if re.search(r'\.(html?|xml)$', n):
+        return 'file'
+    if n.endswith('.css'):
+        return 'file'
+    if n.endswith('.json'):
+        return 'file'
+    if n.endswith('.sql'):
+        return 'file'
+    if re.search(r'\.(sh|bash|zsh)$', n):
+        return 'file'
+    if n.endswith('.ps1'):
+        return 'file'
+    if re.search(r'\.(rs|go|java|rb|php|c|cpp|h|swift|kt|scala|r)$', n):
+        return 'file'
+    if re.search(r'\.(txt|log)$', n):
+        return 'file'
+    if re.search(r'\.(zip|tar|gz|rar|7z)$', n):
+        return 'file'
     return 'file'
 
 
@@ -847,7 +862,7 @@ async def create_property(owner: str, repo: str, name: str = Query(...),
             )
             conn.commit()
         except Exception as e:
-            raise HTTPException(409, f"Property already exists: {e}")
+            raise HTTPException(409, f"Property already exists: {e}") from e
     return {"status": "ok", "name": name, "type": prop_type}
 
 
@@ -901,7 +916,7 @@ async def extract_ai_keywords(owner: str, repo: str):
             if not issue.get("pull_request"):
                 _extract_ai_keywords(owner, repo, issue.get("labels", []), issue.get("body", ""))
     except Exception as e:
-        raise HTTPException(500, str(e))
+        raise HTTPException(500, str(e)) from e
     return {"status": "ok", "issues_scanned": len(issues)}
 
 
@@ -980,7 +995,7 @@ async def save_page_blocks(request: Request, page_id: int):
     try:
         body = await request.json()
     except Exception:
-        raise HTTPException(400, "Invalid JSON body")
+        raise HTTPException(400, "Invalid JSON body") from None
     blocks_json = json.dumps(body.get("blocks", []))
     title = body.get("title", "")
     user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
@@ -1119,7 +1134,7 @@ async def restore_version(request: Request, page_id: int, version_id: int):
 @router.post("/api/pages/{page_id}/duplicate")
 async def duplicate_page(request: Request, page_id: int):
     """Duplicate a page (block/markdown content included) as a sibling."""
-    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
     with get_conn() as conn:
         row = conn.execute(
             "SELECT * FROM pages WHERE id=? AND deleted_at IS NULL", (page_id,)
@@ -1130,7 +1145,7 @@ async def duplicate_page(request: Request, page_id: int):
 
     def copy_tree(src_id: int, parent_id) -> int:
         with get_conn() as conn:
-            src = conn.execute("SELECT * FROM pages WHERE id=?", (src_id,)).fetchone()
+            conn.execute("SELECT * FROM pages WHERE id=?", (src_id,)).fetchone()
             cur = conn.execute(
                 "INSERT INTO pages (workspace, workspace_id, title, content, content_format, "
                 "parent_section, parent_id, sort_order, share_mode, published, is_published, "
@@ -1161,9 +1176,8 @@ async def duplicate_page(request: Request, page_id: int):
 # ═══════════ v5.5.0: Cover & icon ═══════════
 
 
-def _upload_root() -> "Path":
+def _upload_root() -> Path:
     import os
-    from pathlib import Path
     return Path(os.environ.get("FLOWDECK_DATA_DIR", "/data"))
 
 
@@ -1296,7 +1310,7 @@ async def import_page(request: Request):
     try:
         body = await request.json()
     except Exception:
-        raise HTTPException(400, "Invalid JSON body")
+        raise HTTPException(400, "Invalid JSON body") from None
     markdown = body.get("markdown", "")
     title = body.get("title", "")
     if not markdown and not body.get("csv"):
@@ -1328,7 +1342,7 @@ async def import_file(request: Request):
         try:
             zf = zipfile.ZipFile(_io.BytesIO(data))
         except zipfile.BadZipFile:
-            raise HTTPException(400, "Invalid zip archive")
+            raise HTTPException(400, "Invalid zip archive") from None
         md_entries = sorted(
             (n for n in zf.namelist() if n.lower().endswith((".md", ".markdown"))),
             key=lambda n: (n.count("/"), n.lower()),
@@ -1346,7 +1360,7 @@ async def import_file(request: Request):
         try:
             raw = data.decode("utf-8")
         except UnicodeDecodeError:
-            raise HTTPException(400, "Only text/markdown files are supported")
+            raise HTTPException(400, "Only text/markdown files are supported") from None
         title = filename.replace(".md", "").replace(".markdown", "").replace(".txt", "")
         created_ids.append(await _create_page_from_markdown(request, raw, title))
 
@@ -1361,7 +1375,7 @@ async def og_metadata(request: Request):
     try:
         body = await request.json()
     except Exception:
-        raise HTTPException(400, "Invalid JSON body")
+        raise HTTPException(400, "Invalid JSON body") from None
     url = (body.get("url") or "").strip()
     if not url:
         raise HTTPException(400, "url required")
@@ -1373,7 +1387,7 @@ async def og_metadata(request: Request):
 @router.put("/api/pages/{page_id}/move")
 async def move_page(request: Request, page_id: int):
     """Move a page to another workspace or reorder within tree.
-    
+
     Body (JSON): { workspace_id?: int, parent_id?: int, new_order?: int }
     - workspace_id: move page to a different workspace
     - parent_id: change parent (0 = root level)
@@ -1526,4 +1540,4 @@ async def sync_project(owner: str, repo: str):
                 conn.commit()
         return {"status": "ok", "issues_synced": len(issues_only)}
     except Exception as e:
-        raise HTTPException(500, str(e))
+        raise HTTPException(500, str(e)) from e
diff --git a/app/routers/collaboration.py b/app/routers/collaboration.py
index 681b2e4..571b01e 100644
--- a/app/routers/collaboration.py
+++ b/app/routers/collaboration.py
@@ -50,7 +50,7 @@ def _serialize(rows):
 @router.get("/pages/{page_id}/comments")
 async def list_comments(request: Request, page_id: int):
     """List page-level and inline comments for a FlowDeck page."""
-    user = _current_user(request)
+    _current_user(request)
     with get_conn() as conn:
         page = conn.execute("SELECT id, title FROM pages WHERE id=?", (page_id,)).fetchone()
         if not page:
diff --git a/app/routers/collections.py b/app/routers/collections.py
index a793efe..89d07a3 100644
--- a/app/routers/collections.py
+++ b/app/routers/collections.py
@@ -304,7 +304,6 @@ async def duplicate_collection_api(request: Request, collection_id: int):
             )
 
         # ── Pages (rows) with property ids remapped to the copy's properties ──
-        proxies = {}
         prows = conn.execute(
             "SELECT * FROM collection_pages WHERE collection_id=? ORDER BY position",
             (collection_id,),
@@ -554,7 +553,7 @@ async def create_property_api(request: Request, collection_id: int):
             )
             conn.commit()
         except Exception:
-            raise HTTPException(status_code=409, detail=f"Property '{name}' already exists")
+            raise HTTPException(status_code=409, detail=f"Property '{name}' already exists") from None
 
     return {"id": cur.lastrowid, "name": name, "prop_type": prop_type, "status": "created"}
 
@@ -980,7 +979,7 @@ async def check_dependencies(request: Request, collection_id: int, page_id: int)
     except Exception:
         body = {}
 
-    new_status = body.get("new_status", "Done")
+    body.get("new_status", "Done")
 
     with get_conn() as conn:
         page = conn.execute("SELECT property_values_json FROM collection_pages WHERE id=?", (page_id,)).fetchone()
@@ -1070,7 +1069,7 @@ async def add_data_source(request: Request, collection_id: int):
             )
             conn.commit()
         except sqlite3.IntegrityError:
-            raise HTTPException(status_code=409, detail="This data source already exists in this collection")
+            raise HTTPException(status_code=409, detail="This data source already exists in this collection") from None
 
     return {
         "id": cur.lastrowid,
@@ -1109,7 +1108,7 @@ async def create_linked_database(request: Request, collection_id: int):
         body = {}
 
     name = body.get("name", "").strip()
-    new_workspace_id = body.get("workspace_id")
+    body.get("workspace_id")
 
     with get_conn() as conn:
         source = conn.execute(
@@ -1341,7 +1340,7 @@ async def add_page_dependency(request: Request, collection_id: int, page_id: int
             )
             conn.commit()
         except sqlite3.IntegrityError:
-            raise HTTPException(status_code=409, detail="This dependency already exists")
+            raise HTTPException(status_code=409, detail="This dependency already exists") from None
     return {"id": cur.lastrowid, "page_id": page_id, "dependency_id": dependency_id, "status": "added"}
 
 
@@ -1604,7 +1603,7 @@ def _render_gallery(view_type: str, collection: dict, pages: list[dict], config:
         cover_url = config.get("cover_property")
         cover_html = ""
         if cover_url:
-            for k, v in props.items():
+            for _k, v in props.items():
                 if isinstance(v, list) and len(v) > 0:
                     url = v[0].get("url", "") if isinstance(v[0], dict) else str(v[0])
                     if url.startswith("http"):
@@ -1674,7 +1673,7 @@ def _render_timeline(view_type: str, collection: dict, pages: list[dict], config
     for p in pages:
         props = json.loads(p.get("property_values_json", "{}"))
         start_val = end_val = None
-        for k, v in props.items():
+        for _k, v in props.items():
             if isinstance(v, str) and v.startswith("20"):
                 if "..." in v:
                     parts = v.split("...")
@@ -1847,7 +1846,7 @@ def _render_map(view_type: str, collection: dict, pages: list[dict], config: dic
     for p in pages:
         props = json.loads(p.get("property_values_json", "{}"))
         lat, lng = None, None
-        for k, v in props.items():
+        for _k, v in props.items():
             if isinstance(v, str) and "," in v:
                 parts = v.split(",")
                 try:
@@ -1914,7 +1913,7 @@ def _render_gantt(view_type: str, collection: dict, pages: list[dict], config: d
         props = json.loads(p.get("property_values_json", "{}"))
         group = None
         start_val = end_val = None
-        for k, v in props.items():
+        for _k, v in props.items():
             if isinstance(v, str) and v.startswith("20"):
                 if "→" in v:
                     parts = v.split("→")
diff --git a/app/routers/dashboard.py b/app/routers/dashboard.py
index 53ba168..0adf471 100644
--- a/app/routers/dashboard.py
+++ b/app/routers/dashboard.py
@@ -217,7 +217,7 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
         from app.routers.board import _load_shared_sidebar_pages
         shared_made_pages, shared_received_pages, published_pages, shared_pages = _load_shared_sidebar_pages(user["id"])
 
-    return {
+    sidebar = {
         "workspace_name": ws, "workspace_initial": initial,
         "active_ws_name": active_ws_name,
         "workspace_key": f"{gitea_owner}/{gitea_repo}" if gitea_workspace else "",
@@ -937,7 +937,7 @@ async def remove_member(request: Request, ws_id: int, user_id: int):
 @router.get("/local-workspace", response_class=HTMLResponse)
 async def local_workspace_page(request: Request, folder: int = None):
     """Local workspace page with file/folder tree.
-    
+
     If ?folder=ID is provided, shows that folder's contents with breadcrumb.
     """
     from jinja2 import Environment, FileSystemLoader
@@ -984,7 +984,7 @@ async def local_workspace_page(request: Request, folder: int = None):
 @router.get("/api/local-workspace/tree")
 async def local_workspace_tree(request: Request, folder: int = None):
     """Return the file/folder tree filtered by active workspace.
-    
+
     If ?folder=ID is provided, returns only that folder's children.
     Otherwise returns the full recursive tree from root.
     """
@@ -1965,7 +1965,7 @@ async def update_account(request: Request):
 @router.get("/api/sidebar/workspace-tree")
 async def sidebar_workspace_tree(request: Request):
     """Return the sidebar workspace tree as HTML fragment.
-    
+
     Called by appState().refreshSidebarTree() after CRUD operations
     in the main content area to keep the sidebar in sync.
     """
@@ -2296,7 +2296,7 @@ async def api_trash_page(page_id: int):
 @router.post("/api/pages/{page_id:int}/convert-to-database")
 async def api_convert_to_database(page_id: int, request: Request):
     """Convert a page into a full-page database (Notion-style).
-    
+
     Creates a collection linked to this page, adds the default 'Name' property,
     and sets the page's content_format to 'collection'.
     """
diff --git a/app/routers/export.py b/app/routers/export.py
index 71330f5..dd23ee8 100644
--- a/app/routers/export.py
+++ b/app/routers/export.py
@@ -74,10 +74,10 @@ async def export_pdf(page_id: int, request: Request):
     try:
         pdf_bytes = page_to_pdf_bytes(page)
     except ImportError:
-        raise HTTPException(status_code=501, detail="PDF export requires 'weasyprint' or 'xhtml2pdf'")
+        raise HTTPException(status_code=501, detail="PDF export requires 'weasyprint' or 'xhtml2pdf'") from None
     except Exception as exc:  # noqa: BLE001
         logger.error("PDF export failed for page %s: %s", page_id, exc)
-        raise HTTPException(status_code=500, detail="PDF generation failed")
+        raise HTTPException(status_code=500, detail="PDF generation failed") from exc
     filename = _safe_filename(page, "pdf")
     headers = _download_header(filename, "application/pdf")
     return Response(content=pdf_bytes, status_code=200, headers=headers)
diff --git a/app/routers/gitea.py b/app/routers/gitea.py
index 32b5e01..d817cba 100644
--- a/app/routers/gitea.py
+++ b/app/routers/gitea.py
@@ -7,7 +7,7 @@ router = APIRouter(tags=["gitea"], prefix="/api/gitea")
 
 def _require_gitea(request: Request):
     """Return a per-user GiteaClient or raise 401.
-    
+
     Only returns a client if the user has personally connected their Gitea
     account (OAuth token). No fallback to admin token — each user must link
     their own Gitea account to see Gitea projects.
@@ -160,8 +160,8 @@ async def get_labels(request: Request, owner: str, repo: str):
     try:
         labels = await gitea.get_labels(owner, repo)
         return {"labels": [
-            {"id": l["id"], "name": l["name"], "color": l.get("color", "#787774")}
-            for l in labels
+            {"id": lbl["id"], "name": lbl["name"], "color": lbl.get("color", "#787774")}
+            for lbl in labels
         ]}
     except Exception as e:
         return JSONResponse({"error": str(e)}, status_code=502)
@@ -327,7 +327,8 @@ async def sync_labels(request: Request, owner: str, repo: str):
         for label in labels:
             name = label.get("name", "")
             color = label.get("color", "#787774")
-            if not name: continue
+            if not name:
+                continue
             existing = conn.execute(
                 "SELECT id FROM tags WHERE name=? AND user_id=?", (name, user["id"])
             ).fetchone()
diff --git a/app/routers/library.py b/app/routers/library.py
index 1313f07..91bf6cf 100644
--- a/app/routers/library.py
+++ b/app/routers/library.py
@@ -59,9 +59,12 @@ def _build_item(db_row: dict, uid: int = 1) -> dict:
     elif content_format == "file":
         icon = "📄"
         fn = title.lower()
-        if fn.endswith(".pdf"): icon = "📕"
-        elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-        elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+        if fn.endswith(".pdf"):
+            icon = "📕"
+        elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+            icon = "🖼️"
+        elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+            icon = "📜"
     else:
         icon = "📝"
 
@@ -332,7 +335,7 @@ async def library_private(
 @router.get("/local-workspace-children/{item_id:int}")
 async def library_local_workspace_children(item_id: int, request: Request):
     """Return children of a local workspace item for tree expansion."""
-    uid = _get_user_id(request)
+    _get_user_id(request)
     with get_conn() as conn:
         # Get the item to find its workspace
         item = conn.execute(
@@ -358,9 +361,12 @@ async def library_local_workspace_children(item_id: int, request: Request):
         icon = "📁" if is_folder else "📄"
         fn = name.lower()
         if not is_folder:
-            if fn.endswith(".pdf"): icon = "📕"
-            elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-            elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+            if fn.endswith(".pdf"):
+                icon = "📕"
+            elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+                icon = "🖼️"
+            elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+                icon = "📜"
 
         with get_conn() as conn:
             child_count = conn.execute(
@@ -468,9 +474,12 @@ async def library_local_workspace(
         icon = "📁" if is_folder else "📄"
         fn = name.lower()
         if not is_folder:
-            if fn.endswith(".pdf"): icon = "📕"
-            elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-            elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+            if fn.endswith(".pdf"):
+                icon = "📕"
+            elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+                icon = "🖼️"
+            elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+                icon = "📜"
 
         # Check for children
         child_count = conn.execute(
@@ -505,10 +514,14 @@ async def library_local_workspace(
 
 
 def _format_size(size_bytes):
-    if not size_bytes: return ""
-    if size_bytes < 1024: return f"{size_bytes} B"
-    if size_bytes < 1048576: return f"{size_bytes/1024:.1f} KB"
-    if size_bytes < 1073741824: return f"{size_bytes/1048576:.1f} MB"
+    if not size_bytes:
+        return ""
+    if size_bytes < 1024:
+        return f"{size_bytes} B"
+    if size_bytes < 1048576:
+        return f"{size_bytes/1024:.1f} KB"
+    if size_bytes < 1073741824:
+        return f"{size_bytes/1048576:.1f} MB"
     return f"{size_bytes/1073741824:.1f} GB"
 
 
diff --git a/app/routers/my_tasks.py b/app/routers/my_tasks.py
index c67ff3b..1e69986 100644
--- a/app/routers/my_tasks.py
+++ b/app/routers/my_tasks.py
@@ -121,7 +121,7 @@ async def my_tasks_dashboard(request: Request, view: str = "all", days: int = 7)
 async def my_tasks_api(request: Request, view: str = "all", days: int = 7):
     """API: return my tasks as JSON."""
     user = _get_current_user(request)
-    user_login = user.get("login", "admin") if user else "admin"
+    user.get("login", "admin") if user else "admin"
 
     with get_conn() as conn:
         collections = conn.execute("SELECT * FROM collections ORDER BY name").fetchall()
diff --git a/app/routers/notifications.py b/app/routers/notifications.py
index 38be1c8..7e18c94 100644
--- a/app/routers/notifications.py
+++ b/app/routers/notifications.py
@@ -107,7 +107,7 @@ async def set_prefs(request: Request):
 @router.get("/users/search")
 async def search_users(request: Request, q: str = ""):
     """User autocomplete for @mentions."""
-    user = _current_user(request)
+    _current_user(request)
     q = (q or "").strip()
     with get_conn() as conn:
         if q:
diff --git a/app/routers/sharing.py b/app/routers/sharing.py
index 8257c51..edb5c10 100644
--- a/app/routers/sharing.py
+++ b/app/routers/sharing.py
@@ -201,7 +201,7 @@ async def list_shares(page_id: int, request: Request):
 @router.post("/pages/{page_id}/publish")
 async def publish_page(page_id: int, request: Request):
     """Publish a page (is_published=1) with a URL slug."""
-    user = _require_auth(request)
+    _require_auth(request)
 
     with get_conn() as conn:
         page = conn.execute(
diff --git a/app/routers/sidebar_config.py b/app/routers/sidebar_config.py
index 65fb473..5058aae 100644
--- a/app/routers/sidebar_config.py
+++ b/app/routers/sidebar_config.py
@@ -86,7 +86,7 @@ async def save_sidebar_config(request: Request):
     try:
         body = await request.json()
     except Exception:
-        raise HTTPException(status_code=400, detail="Invalid JSON body")
+        raise HTTPException(status_code=400, detail="Invalid JSON body") from None
 
     config = body.get("config")
     if not config or not isinstance(config, dict):
diff --git a/app/routers/webhooks.py b/app/routers/webhooks.py
index 476a15f..34c560a 100644
--- a/app/routers/webhooks.py
+++ b/app/routers/webhooks.py
@@ -162,7 +162,7 @@ async def register_webhook(owner: str, repo: str, request: Request):
         return {"status": "ok", "webhook": result}
     except Exception as e:
         logger.error("Failed to register webhook: %s", e)
-        raise HTTPException(status_code=500, detail=str(e))
+        raise HTTPException(status_code=500, detail=str(e)) from e
 
 
 @router.get("/status/{owner}/{repo}")
diff --git a/app/routers/workspace.py b/app/routers/workspace.py
index 42d19e8..e01a778 100644
--- a/app/routers/workspace.py
+++ b/app/routers/workspace.py
@@ -512,13 +512,13 @@ async def assign_page_to_sprint(request: Request, collection_id: int, sid: int):
             raise HTTPException(404, "Page not found")
 
         try:
-            cur = conn.execute(
+            conn.execute(
                 "INSERT INTO sprint_pages (sprint_id, page_id, status_at_start, velocity_points) VALUES (?,?,?,?)",
                 (sid, page_id, status_at_start, velocity_points),
             )
             conn.commit()
         except sqlite3.IntegrityError:
-            raise HTTPException(409, "Page already assigned to this sprint")
+            raise HTTPException(409, "Page already assigned to this sprint") from None
     return {"sprint_id": sid, "page_id": page_id, "status": "assigned"}
 
 
diff --git a/app/services/agent_engine.py b/app/services/agent_engine.py
index f9ea654..8622d37 100644
--- a/app/services/agent_engine.py
+++ b/app/services/agent_engine.py
@@ -166,7 +166,7 @@ class AgentEngine:
         used_model = model or ""  # peut être ajusté par un repli de modèle (404/410)
 
         try:
-            for step in range(settings.agent_max_iterations or MAX_ITERATIONS):
+            for _step in range(settings.agent_max_iterations or MAX_ITERATIONS):
                 if self._tokens >= settings.agent_max_tokens_budget:
                     yield self._event("error", {"message": "Budget de tokens dépassé"})
                     break
diff --git a/app/services/embeds.py b/app/services/embeds.py
index dc084bc..64cc808 100644
--- a/app/services/embeds.py
+++ b/app/services/embeds.py
@@ -147,7 +147,7 @@ def embed_src(url: str) -> str | None:
     u = urlparse(url if url.startswith("http") else "https://" + url)
     if u.scheme not in ("http", "https"):
         return None
-    host = (u.hostname or "").lower().replace("www.", "")
+    (u.hostname or "").lower().replace("www.", "")
     netloc = (u.netloc or "").lower()
     params = parse_qs(u.query)
     # Google Maps share links encode the query in the path (…&q=/maps/…)
@@ -191,4 +191,4 @@ def embed_html(src: str, *, height: int = 520) -> str:
         f'style="width:100%;height:{height}px;border:none;border-radius:8px;background:#000;" '
         f'allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; '
         f'picture-in-picture" allowfullscreen></iframe>'
-    )
\ No newline at end of file
+    )
diff --git a/app/services/export.py b/app/services/export.py
index 11526eb..c22f96d 100644
--- a/app/services/export.py
+++ b/app/services/export.py
@@ -243,7 +243,8 @@ def _parse_table_at(lines: list[str], i: int, n: int):
         rows.append(cells)
         j += 1
     width = max(len(r) for r in rows)
-    pad = lambda r: r + [""] * (width - len(r))
+    def pad(r):
+        return r + [""] * (width - len(r))
     align = (align + ["left"] * width)[:width]
     return (
         {
@@ -657,7 +658,7 @@ def blocks_to_html(blocks: list) -> str:
             url = b.get("src") or ""
             emb = (b.get("embed_type") or "")
             if emb in ("inline_dbs", "collection"):
-                parts.append(f'<div class="embed-note">[Embedded content]</div>')
+                parts.append('<div class="embed-note">[Embedded content]</div>')
             elif emb == "download":
                 parts.append(f'<a href="{_text(url)}" download>⬇ {_text(b.get("file_name") or "Download")}</a>')
             elif emb == "pdf" and url:
diff --git a/app/services/notifications.py b/app/services/notifications.py
index 89b0d22..31aee18 100644
--- a/app/services/notifications.py
+++ b/app/services/notifications.py
@@ -94,7 +94,7 @@ def _do_mentions(conn, handles, actor_id, ntype, title, message,
                  resource_type, resource_id, url, notified):
     placeholders = ",".join("?" * len(handles))
     rows = conn.execute(
-        "SELECT id, login, email FROM users WHERE lower(login) IN (%s)" % placeholders,
+        f"SELECT id, login, email FROM users WHERE lower(login) IN ({placeholders})",
         handles,
     ).fetchall()
     for row in rows:
diff --git a/app/services/og_fetcher.py b/app/services/og_fetcher.py
index 00a2df5..4cd68d3 100644
--- a/app/services/og_fetcher.py
+++ b/app/services/og_fetcher.py
@@ -29,7 +29,7 @@ def _extract_og(html: str) -> dict:
     text = html[:400_000]  # only scan the beginning — that's where <head> lives
     props: dict[str, str] = {}
     for m in _META_RE.finditer(text):
-        groups = m.groups()
+        m.groups()
         content = ""
         prop = ""
         for s in re.findall(r"(?:content|property|name)=[\"']([^\"']*)[\"']", m.group(0)):
@@ -121,4 +121,4 @@ async def fetch_og_metadata(url: str, timeout: float = 6.0) -> dict:
         "image": abs_url(img),
         "site_name": site.strip()[:100],
         "favicon": favicon,
-    }
\ No newline at end of file
+    }
diff --git a/app/services/trash.py b/app/services/trash.py
index 87cb5f1..c5c37b5 100644
--- a/app/services/trash.py
+++ b/app/services/trash.py
@@ -84,4 +84,4 @@ async def trash_purge_scheduler(interval_hours: int = 24):
             purge_expired(days=30)
         except Exception as exc:  # pragma: no cover - defensive only
             logger.warning("Trash purge failed: %s", exc)
-        await asyncio.sleep(interval_hours * 3600)
\ No newline at end of file
+        await asyncio.sleep(interval_hours * 3600)
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..d925390
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,63 @@
+// FlowDeck — ESLint flat config (v5.2.0).
+// ESLint v9+ requires the flat config format; the legacy `.eslintrc.json`
+// is no longer read. Run with: `npx eslint static/js`.
+//
+// Self-contained on purpose: no dependency on the `globals` npm package so the
+// config works with a globally-installed ESLint (no node_modules required).
+
+const browserGlobals = {
+  // Browser / DOM
+  window: "readonly", document: "readonly", navigator: "readonly",
+  location: "readonly", history: "readonly", screen: "readonly",
+  localStorage: "readonly", sessionStorage: "readonly", console: "readonly",
+  alert: "readonly", confirm: "readonly", prompt: "readonly", fetch: "readonly",
+  setTimeout: "readonly", clearTimeout: "readonly", setInterval: "readonly",
+  clearInterval: "readonly", requestAnimationFrame: "readonly",
+  cancelAnimationFrame: "readonly", requestIdleCallback: "readonly",
+  cancelIdleCallback: "readonly", queueMicrotask: "readonly",
+  XMLHttpRequest: "readonly", FormData: "readonly", Blob: "readonly",
+  File: "readonly", FileReader: "readonly", URL: "readonly",
+  URLSearchParams: "readonly", Image: "readonly", Event: "readonly",
+  CustomEvent: "readonly", EventSource: "readonly", WebSocket: "readonly",
+  DOMParser: "readonly", Node: "readonly", NodeList: "readonly",
+  Element: "readonly", HTMLElement: "readonly", getComputedStyle: "readonly",
+  matchMedia: "readonly", IntersectionObserver: "readonly",
+  MutationObserver: "readonly", ResizeObserver: "readonly",
+  performance: "readonly", crypto: "readonly", btoa: "readonly",
+  atob: "readonly", structuredClone: "readonly",
+  // ECMAScript built-ins
+  JSON: "readonly", Math: "readonly", Date: "readonly", Promise: "readonly",
+  Object: "readonly", Array: "readonly", String: "readonly", Number: "readonly",
+  Boolean: "readonly", Symbol: "readonly", Map: "readonly", Set: "readonly",
+  WeakMap: "readonly", WeakSet: "readonly", Error: "readonly",
+  TypeError: "readonly", RangeError: "readonly", RegExp: "readonly",
+  Proxy: "readonly", Reflect: "readonly", Intl: "readonly",
+  parseInt: "readonly", parseFloat: "readonly", isNaN: "readonly",
+  isFinite: "readonly", encodeURIComponent: "readonly",
+  decodeURIComponent: "readonly", encodeURI: "readonly", decodeURI: "readonly",
+  globalThis: "readonly", Infinity: "readonly", NaN: "readonly",
+  // FlowDeck front-end libraries
+  Alpine: "readonly", htmx: "readonly", Sortable: "readonly",
+  // Globals exposed on window by app.js
+  openModal: "readonly", closeModal: "readonly",
+};
+
+export default [
+  {
+    ignores: ["static/js/*.min.js", "static/js/vendor/**"],
+  },
+  {
+    files: ["static/js/**/*.js"],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: "script",
+      globals: browserGlobals,
+    },
+    rules: {
+      "no-unused-vars": ["warn", { args: "none" }],
+      "no-undef": "warn",
+      "no-extra-semi": "warn",
+      "no-empty": "warn",
+    },
+  },
+];
diff --git a/pyproject.toml b/pyproject.toml
index 8203ef2..1fb0159 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,10 @@
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 pythonpath = ["."]
-# Parallel execution via pytest-xdist (v5.2.0). Override with `-n 0` to run
-# sequentially: `pytest -n 0`.
-# Note: some tests use shared temp directories — run sequentially for stability.
-addopts = "-n 0"
+# Parallel execution (pytest-xdist) is OPT-IN so a bare `pytest` never fails
+# when xdist is not installed. Run locally with `pytest -n auto`; CI passes
+# `-n auto` explicitly after installing requirements-dev.txt.
+
 
 [tool.ruff]
 target-version = "py312"
@@ -18,4 +18,18 @@ select = ["E", "F", "I", "UP", "B", "W"]
 ignore = ["E501", "UP035"]
 
 [tool.ruff.lint.isort]
-known-first-party = ["app", "tests"]
\ No newline at end of file
+known-first-party = ["app", "tests"]
+
+[tool.ruff.lint.flake8-bugbear]
+# FastAPI requires dependency markers (Depends, Query, ...) in argument
+# defaults — that is not the bug B008 warns about.
+extend-immutable-calls = [
+  "fastapi.Depends",
+  "fastapi.Query",
+  "fastapi.Path",
+  "fastapi.Body",
+  "fastapi.Form",
+  "fastapi.File",
+  "fastapi.Header",
+  "fastapi.Cookie",
+]
\ No newline at end of file
diff --git a/static/js/app.js b/static/js/app.js
index daffb73..25e30af 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -22,7 +22,7 @@
       xhr.open('POST', '/api/frontend-error', true);
       xhr.setRequestHeader('Content-Type', 'application/json');
       xhr.send(JSON.stringify(error));
-    } catch(e) { /* fail silently */ }
+    } catch { /* fail silently */ }
   }
 
   window.addEventListener('error', function(e) {
diff --git a/tests/conftest.py b/tests/conftest.py
index 57b2507..22ae76b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,9 +1,15 @@
-"""FlowDeck — pytest fixtures and configuration."""
+"""FlowDeck — pytest fixtures and configuration.
+
+Each test gets a fresh, isolated SQLite database and backup directory so the
+suite is safe to run in parallel (``pytest -n auto``): workers never share a
+database file, and no state leaks between tests.
+"""
 import os
 import tempfile
 from pathlib import Path
 
 import pytest
+from fastapi.testclient import TestClient
 
 
 @pytest.fixture
@@ -15,7 +21,7 @@ def client():
 
     backup_dir = tempfile.mkdtemp(prefix="fd_backups_")
 
-    # Set env BEFORE importing app modules (config reads at import time)
+    # Set env BEFORE importing app modules (config reads at import time).
     os.environ["DATABASE_URL"] = f"sqlite:///{db_path}"
     os.environ["APP_SECRET_KEY"] = "test-secret-for-tests"
     os.environ["RATE_LIMIT_ENABLED"] = "false"
@@ -23,9 +29,21 @@ def client():
     os.environ["BACKUP_DIR"] = backup_dir
     os.environ["PROJECT_SYNC_ENABLED"] = "false"
 
-    # Force config reload by clearing the cached Settings instance
+    # IMPORTANT: mutate the existing Settings singleton in place — do NOT rebind
+    # `app.config.settings`. Modules such as `app.services.backup` and
+    # `app.routers.auth` hold a direct reference imported at load time, so
+    # rebinding would leave them pointing at the stale defaults (this was the
+    # cause of the previously-skipped flaky backup tests).
     import app.config
-    app.config.settings = app.config.Settings()
+    s = app.config.settings
+    s.database_url = f"sqlite:///{db_path}"
+    s.app_secret_key = "test-secret-for-tests"
+    s.rate_limit_enabled = False
+    s.backup_enabled = True
+    s.backup_dir = backup_dir
+    s.backup_interval_hours = 24
+    s.backup_keep = 30
+    s.project_sync_enabled = False
 
     from app.db import init_db
     from app.main import app
@@ -47,6 +65,3 @@ def client():
         Path(backup_dir).rmdir()
     except OSError:
         pass
-
-
-from fastapi.testclient import TestClient
diff --git a/tests/test_app.py b/tests/test_app.py
index 098f3c7..df02f53 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -19,10 +19,25 @@ def client():
     os.environ["APP_SECRET_KEY"] = "test-secret-for-tests"
     os.environ["RATE_LIMIT_ENABLED"] = "false"
 
+    # Point the process-wide settings singleton at OUR temp DB (xdist-safe).
+    from app.config import settings
+    settings.database_url = f"sqlite:///{db_path}"
+    settings.rate_limit_enabled = False
+
     from app.db import init_db
     from app.main import app
     init_db()
 
+    # A default user id=1 so tests that reference the implicit user (favorites,
+    # workspace ownership) satisfy foreign keys without relying on leaked state.
+    from app.db import get_conn
+    with get_conn() as conn:
+        conn.execute(
+            "INSERT OR IGNORE INTO users (id, login, full_name, email, is_admin) "
+            "VALUES (1, 'tester', 'Tester', 'tester@test.dev', 1)"
+        )
+        conn.commit()
+
     yield TestClient(app)
 
     os.unlink(db_path)
@@ -1915,7 +1930,7 @@ def test_nav_menu_workspace_pages(client):
     """/api/nav/menu returns root pages and nested children for a workspace."""
     from app.db import get_conn
     with get_conn() as conn:
-        u = conn.execute("INSERT OR IGNORE INTO users (login) VALUES ('navuser')")
+        conn.execute("INSERT OR IGNORE INTO users (login) VALUES ('navuser')")
         uid = conn.execute("SELECT id FROM users WHERE login='navuser'").fetchone()["id"]
         cur = conn.execute("INSERT INTO workspaces (name, owner_id) VALUES ('NavWS', ?)", (uid,))
         ws_id = cur.lastrowid
@@ -3294,7 +3309,7 @@ def test_v490_create_comment_with_mentions(client):
                     json={"body": "regarde ca @v4901", "anchor_block_id": "b1", "anchor_start": 0, "anchor_end": 5},
                     cookies=cookies)
     assert r.status_code == 200
-    cid = r.json()["id"]
+    r.json()["id"]
 
     r = client.get(f"/api/pages/{pid}/comments", cookies=cookies)
     assert r.status_code == 200
diff --git a/tests/test_automations.py b/tests/test_automations.py
index febaae6..de09600 100644
--- a/tests/test_automations.py
+++ b/tests/test_automations.py
@@ -159,7 +159,7 @@ def test_automation_scope_collection_filter(client):
     }).json()["id"]
 
     p_c1 = _make_page(client, c1, props={"Status": "Todo"})
-    p_c2 = _make_page(client, c2, props={"Status": "Todo"})
+    _make_page(client, c2, props={"Status": "Todo"})
 
     from app.db import get_conn
     with get_conn() as conn:
diff --git a/tests/test_db_advanced.py b/tests/test_db_advanced.py
index 7c12a5e..dd650af 100644
--- a/tests/test_db_advanced.py
+++ b/tests/test_db_advanced.py
@@ -17,6 +17,11 @@ def client():
     os.environ["APP_SECRET_KEY"] = "test-secret-for-tests"
     os.environ["RATE_LIMIT_ENABLED"] = "false"
 
+    # Point the process-wide settings singleton at OUR temp DB (xdist-safe).
+    from app.config import settings
+    settings.database_url = f"sqlite:///{db_path}"
+    settings.rate_limit_enabled = False
+
     from app.db import init_db
     from app.main import app
     init_db()
diff --git a/tests/test_realtime.py b/tests/test_realtime.py
index 99e4df7..11c1981 100644
--- a/tests/test_realtime.py
+++ b/tests/test_realtime.py
@@ -194,7 +194,8 @@ def test_ws_presence_join_leave(client):
     pid = _make_page()
     _auth_client(client, 1, "tester")
     with client.websocket_connect(f"/ws/pages/{pid}") as wa:
-        wa.receive_json(); wa.receive_json()
+        wa.receive_json()
+        wa.receive_json()
         _auth_client(client, 2, "other")
         with client.websocket_connect(f"/ws/pages/{pid}") as wb:
             w_f = wb.receive_json()  # welcome
@@ -211,10 +212,12 @@ def test_ws_cursor_broadcast(client):
     pid = _make_page(blocks=[{"id": "a", "type": "paragraph", "content": "l"}])
     _auth_client(client, 1, "tester")
     with client.websocket_connect(f"/ws/pages/{pid}") as wa:
-        wa.receive_json(); wa.receive_json()
+        wa.receive_json()
+        wa.receive_json()
         _auth_client(client, 2, "other")
         with client.websocket_connect(f"/ws/pages/{pid}") as wb:
-            wb.receive_json(); wb.receive_json()
+            wb.receive_json()
+            wb.receive_json()
             wa.receive_json()  # peer_join
             wa.send_json({"t": "sel", "block": "a", "offset": 1})
             m = wb.receive_json()
@@ -229,10 +232,12 @@ def test_ws_title_broadcast(client):
     pid = _make_page()
     _auth_client(client, 1, "tester")
     with client.websocket_connect(f"/ws/pages/{pid}") as wa:
-        wa.receive_json(); wa.receive_json()
+        wa.receive_json()
+        wa.receive_json()
         _auth_client(client, 2, "other")
         with client.websocket_connect(f"/ws/pages/{pid}") as wb:
-            wb.receive_json(); wb.receive_json()
+            wb.receive_json()
+            wb.receive_json()
             wa.receive_json()
             wa.send_json({"t": "title", "title": "Nouveau titre"})
             m = wb.receive_json()
diff --git a/tests/test_search_migrations.py b/tests/test_search_migrations.py
index e09288f..86bc8fa 100644
--- a/tests/test_search_migrations.py
+++ b/tests/test_search_migrations.py
@@ -20,6 +20,11 @@ def client():
     os.environ["APP_SECRET_KEY"] = "test-secret-for-tests"
     os.environ["RATE_LIMIT_ENABLED"] = "false"
 
+    # Point the process-wide settings singleton at OUR temp DB (xdist-safe).
+    from app.config import settings
+    settings.database_url = f"sqlite:///{db_path}"
+    settings.rate_limit_enabled = False
+
     from app.db import init_db
     from app.main import app
     init_db()
diff --git a/tests/test_v52_infra.py b/tests/test_v52_infra.py
index df125a9..c4fecff 100644
--- a/tests/test_v52_infra.py
+++ b/tests/test_v52_infra.py
@@ -148,16 +148,64 @@ def test_onboarding_workspace_and_project(client):
 # ═══════════════ Backups ═══════════════
 
 def test_backup_snapshot_and_pruning(client):
-    """Skipped: flaky due to test isolation issues with global config state.
-    Passes when run in isolation.
-    """
-    pytest.skip("Flaky: backup_dir cleanup interference between tests")
+    """backup_db() snapshots the SQLite file and prune keeps the newest N."""
+    import datetime
 
-def test_backup_admin_api_requires_admin(client):
-    """Skipped: flaky due to test isolation issues with global config state.
-    Passes when run in isolation.
-    """
-    pytest.skip("Flaky: admin API test interference between tests")
+    from app.services import backup as backup_svc
+
+    base = datetime.datetime(2026, 1, 1, 0, 0, 0)
+    first = backup_svc.backup_db(now=base)
+    assert first and first.startswith("flowdeck-") and first.endswith(".db")
+
+    backups = backup_svc.list_backups()
+    assert len(backups) == 1
+    assert backups[0]["filename"] == first
+    assert backups[0]["size"] > 0
+
+    # Distinct timestamps → distinct filenames (the format has 1-second resolution).
+    for i in range(1, 4):
+        assert backup_svc.backup_db(now=base + datetime.timedelta(seconds=i))
+    assert len(backup_svc.list_backups()) == 4
+
+    removed = backup_svc.prune_old_backups(keep=2)
+    assert removed == 2
+    remaining = backup_svc.list_backups()
+    assert len(remaining) == 2
+    # Newest first (filename sort == chronological for this format).
+    assert remaining[0]["filename"] > remaining[1]["filename"]
+
+    # Age + due logic (file mtime is "now", so a fresh backup is not due).
+    assert backup_svc.last_backup_age_hours() is not None
+    assert backup_svc.backup_due() is False
+
+
+def test_backup_disabled_returns_none(client):
+    from app.config import settings
+    from app.services import backup as backup_svc
+
+    previous = settings.backup_enabled
+    settings.backup_enabled = False
+    try:
+        assert backup_svc.backup_db() is None
+    finally:
+        settings.backup_enabled = previous
+
+
+def test_backup_admin_api(client):
+    """The backup admin API is admin-only and snapshots on demand."""
+    # Unauthenticated → forbidden.
+    assert client.post("/api/settings/backups/run").status_code == 403
+
+    # First registered user becomes admin → allowed.
+    _register(client)
+    run = client.post("/api/settings/backups/run")
+    assert run.status_code == 200, run.text
+    assert run.json()["status"] == "ok"
+    assert run.json()["filename"].startswith("flowdeck-")
+
+    listing = client.get("/api/settings/backups")
+    assert listing.status_code == 200
+    assert len(listing.json()["backups"]) >= 1
 
 
 # ═══════════════ Projects registry ═══════════════
@@ -266,6 +314,152 @@ def test_projects_sync_with_mock_client(client):
 
 os.environ.setdefault("PROJECT_SYNC_ENABLED", "false")
 
+# ═══════════════ OAuth integration (mocked providers) ═══════════════
+
+
+class _FakeProvider:
+    """Stand-in OAuth provider — no network calls."""
+
+    name = "gitea"
+    icon = "🔗"
+
+    def __init__(self, login="octocat", full_name="Octo Cat", email="octo@test.dev"):
+        self.login = login
+        self.full_name = full_name
+        self.email = email
+
+    def is_enabled(self) -> bool:
+        return True
+
+    def get_authorize_url(self, state, redirect_uri=None, force_login=False):
+        return f"https://gitea.test/login/oauth/authorize?client_id=cid&state={state}"
+
+    async def exchange_code(self, code, redirect_uri=None):
+        return {"access_token": "tok-123", "refresh_token": "ref-123"}
+
+    async def get_user(self, access_token):
+        return {
+            "login": self.login,
+            "full_name": self.full_name,
+            "email": self.email,
+            "avatar_url": "https://gitea.test/avatar.png",
+            "provider_id": "42",
+        }
+
+    async def list_repositories(self, access_token):
+        return []
+
+
+def _patch_provider(monkeypatch, provider=None):
+    from app.auth import providers
+    fake = provider or _FakeProvider()
+    monkeypatch.setattr(providers, "get_provider", lambda name: fake if name in ("gitea", "github") else None)
+    return fake
+
+
+def _extract_state(location: str) -> str:
+    from urllib.parse import parse_qs, urlparse
+    return parse_qs(urlparse(location).query)["state"][0]
+
+
+def test_oauth_login_callback_flow(client, monkeypatch):
+    """Full login flow: authorize redirect → callback → user + token + session."""
+    _patch_provider(monkeypatch)
+
+    login = client.get("/auth/login?provider=gitea", follow_redirects=False)
+    assert login.status_code == 302
+    assert "gitea.test/login/oauth/authorize" in login.headers["location"]
+    state = _extract_state(login.headers["location"])
+
+    cb = client.get(f"/auth/callback?code=abc&state={state}", follow_redirects=False)
+    assert cb.status_code == 302
+    assert "/workspaces" in cb.headers["location"]
+    assert client.cookies.get("flowdeck_session")
+
+    from app.db import get_conn
+    with get_conn() as conn:
+        user = conn.execute("SELECT id, auth_method FROM users WHERE login='gitea_octocat'").fetchone()
+        assert user and user["auth_method"] == "gitea"
+        token = conn.execute(
+            "SELECT access_token FROM user_oauth_tokens WHERE user_id=? AND provider='gitea'",
+            (user["id"],),
+        ).fetchone()
+        assert token and token["access_token"] == "tok-123"
+
+    me = client.get("/auth/user").json()
+    assert me["authenticated"] is True
+    assert me["user"]["login"] == "gitea_octocat"
+
+
+def test_oauth_github_callback_creates_github_user(client, monkeypatch):
+    _patch_provider(monkeypatch, _FakeProvider(login="hubber", full_name="Hub Ber"))
+
+    login = client.get("/auth/login?provider=github", follow_redirects=False)
+    assert login.status_code == 302
+    state = _extract_state(login.headers["location"])
+
+    cb = client.get(f"/auth/callback?code=xyz&state={state}", follow_redirects=False)
+    assert cb.status_code == 302
+
+    from app.db import get_conn
+    with get_conn() as conn:
+        user = conn.execute("SELECT id, auth_method FROM users WHERE login='github_hubber'").fetchone()
+        assert user and user["auth_method"] == "github"
+        token = conn.execute(
+            "SELECT access_token FROM user_oauth_tokens WHERE user_id=? AND provider='github'",
+            (user["id"],),
+        ).fetchone()
+        assert token and token["access_token"] == "tok-123"
+
+
+def test_oauth_link_mode_attaches_to_current_user(client, monkeypatch):
+    """mode=link must attach the forge token to the already-logged-in user."""
+    _register(client)
+    _patch_provider(monkeypatch)
+
+    login = client.get("/auth/login?provider=gitea&mode=link", follow_redirects=False)
+    state = _extract_state(login.headers["location"])
+    assert state.endswith(":link")
+
+    cb = client.get(f"/auth/callback?code=abc&state={state}", follow_redirects=False)
+    assert cb.status_code == 302
+    assert "settings" in cb.headers["location"]
+
+    from app.db import get_conn
+    with get_conn() as conn:
+        user = conn.execute("SELECT id FROM users WHERE login='alice@test.dev'").fetchone()
+        token = conn.execute(
+            "SELECT access_token FROM user_oauth_tokens WHERE user_id=? AND provider='gitea'",
+            (user["id"],),
+        ).fetchone()
+        assert token and token["access_token"] == "tok-123"
+        # No new OAuth user was created.
+        count = conn.execute("SELECT COUNT(*) FROM users WHERE login LIKE 'gitea_%'").fetchone()[0]
+        assert count == 0
+
+
+def test_oauth_callback_rejects_invalid_state(client, monkeypatch):
+    _patch_provider(monkeypatch)
+    client.get("/auth/login?provider=gitea", follow_redirects=False)
+    bad = client.get("/auth/callback?code=abc&state=tampered", follow_redirects=False)
+    assert bad.status_code == 400
+
+
+def test_oauth_provider_authorize_urls():
+    from app.auth.providers import GiteaProvider, GitHubProvider
+
+    gitea = GiteaProvider("https://git.example.com", "cid", "sec", "https://app/auth/callback")
+    assert gitea.is_enabled()
+    gitea_url = gitea.get_authorize_url("st", redirect_uri="https://app/auth/callback")
+    assert gitea_url.startswith("https://git.example.com/login/oauth/authorize?")
+    assert "client_id=cid" in gitea_url and "state=st" in gitea_url
+
+    github = GitHubProvider("cid", "sec", "https://app/auth/callback")
+    assert github.is_enabled()
+    assert "github.com/login/oauth/authorize" in github.get_authorize_url("st")
+    assert not GitHubProvider("", "", "https://app/auth/callback").is_enabled()
+
+
 # ═══════════════ Multi-user permissions ═══════════════
 
 def test_permission_manager_roles(client):
diff --git a/tests/test_v54.py b/tests/test_v54.py
index ba2e47e..de80991 100644
--- a/tests/test_v54.py
+++ b/tests/test_v54.py
@@ -3,19 +3,18 @@ and v5.5.0 (embed, bookmark, video, audio, cover, icon)."""
 from __future__ import annotations
 
 import json
-import tempfile
 import os
-
-import pytest
+import tempfile
 
 # ── Helpers ──────────────────────────────────────────────────────────────
 
 
 def _login(client):
     """Create admin user and return session cookie + csrf token (like test_app.py)."""
+    import secrets
+
     from app.auth.session import SessionManager
     from app.db import get_conn
-    import secrets
 
     with get_conn() as conn:
         login = f"testadmin_{secrets.token_hex(4)}"
@@ -167,7 +166,7 @@ class TestV54VersionHistory:
         )
         data2 = r2.json()
         assert len(data2["versions"]) >= 2
-        v2_id = data2["versions"][0]["id"]
+        data2["versions"][0]["id"]
 
         # restore v1
         r3 = client.post(
@@ -191,10 +190,11 @@ class TestV54TrashPurge:
     """v5.4.0: global trash 30-day purge."""
 
     def test_trash_purge_removes_old_deleted_pages(self, client):
-        from app.services.trash import purge_expired
-        from app.db import init_db, get_conn
         import datetime
 
+        from app.db import get_conn, init_db
+        from app.services.trash import purge_expired
+
         # create temp DB
         tmp = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
         tmp.close()
@@ -565,4 +565,4 @@ class TestDashboardPublicNewBlocks:
         assert "<video" in html
         assert "<audio" in html
         assert "bookmark" in html or "Ex" in html
-        assert "iframe" in html
\ No newline at end of file
+        assert "iframe" in html