Refactor(backend): improve formatting in services, repositories & tests

- Consistently format multi-line function headers, exception handling, and repository method calls for readability.
- Reorganize misplaced imports across modules (e.g., services & tests) into proper sorted order.
- Adjust indentation, line breaks, and spacing inconsistencies in tests and migration files.
- Cleanup unnecessary trailing newlines and reorganize `__all__` declarations for consistency.

backend/app/repositories/__init__.py

@@ -18,22 +18,22 @@ from app.repositories.session import SessionRepository, session_repo
 from app.repositories.user import UserRepository, user_repo
 
 __all__ = [
-    "UserRepository",
-    "user_repo",
-    "OrganizationRepository",
-    "organization_repo",
-    "SessionRepository",
-    "session_repo",
     "OAuthAccountRepository",
-    "oauth_account_repo",
     "OAuthAuthorizationCodeRepository",
-    "oauth_authorization_code_repo",
     "OAuthClientRepository",
-    "oauth_client_repo",
     "OAuthConsentRepository",
-    "oauth_consent_repo",
     "OAuthProviderTokenRepository",
-    "oauth_provider_token_repo",
     "OAuthStateRepository",
+    "OrganizationRepository",
+    "SessionRepository",
+    "UserRepository",
+    "oauth_account_repo",
+    "oauth_authorization_code_repo",
+    "oauth_client_repo",
+    "oauth_consent_repo",
+    "oauth_provider_token_repo",
     "oauth_state_repo",
+    "organization_repo",
+    "session_repo",
+    "user_repo",
 ]

backend/app/repositories/base.py

@@ -411,4 +411,3 @@ class BaseRepository[
                 exc_info=True,
             )
             raise
-

backend/app/repositories/oauth_account.py

@@ -23,7 +23,9 @@ class EmptySchema(BaseModel):
     """Placeholder schema for repository operations that don't need update schemas."""
 
 
-class OAuthAccountRepository(BaseRepository[OAuthAccount, OAuthAccountCreate, EmptySchema]):
+class OAuthAccountRepository(
+    BaseRepository[OAuthAccount, OAuthAccountCreate, EmptySchema]
+):
     """Repository for OAuth account links."""
 
     async def get_by_provider_id(

backend/app/repositories/oauth_client.py

@@ -22,7 +22,9 @@ class EmptySchema(BaseModel):
     """Placeholder schema for repository operations that don't need update schemas."""
 
 
-class OAuthClientRepository(BaseRepository[OAuthClient, OAuthClientCreate, EmptySchema]):
+class OAuthClientRepository(
+    BaseRepository[OAuthClient, OAuthClientCreate, EmptySchema]
+):
     """Repository for OAuth clients (provider mode)."""
 
     async def get_by_client_id(

backend/app/repositories/oauth_consent.py

@@ -2,9 +2,8 @@
 """Repository for OAuthConsent model."""
 
 import logging
-from uuid import UUID
-
 from typing import Any
+from uuid import UUID
 
 from sqlalchemy import and_, delete, select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -49,7 +48,9 @@ class OAuthConsentRepository:
         consent = await self.get_consent(db, user_id=user_id, client_id=client_id)
 
         if consent:
-            existing = set(consent.granted_scopes.split()) if consent.granted_scopes else set()
+            existing = (
+                set(consent.granted_scopes.split()) if consent.granted_scopes else set()
+            )
             merged = existing | set(scopes)
             consent.granted_scopes = " ".join(sorted(merged))  # type: ignore[assignment]
         else:

backend/app/repositories/oauth_provider_token.py

@@ -99,9 +99,7 @@ class OAuthProviderTokenRepository:
             await db.commit()
         return count
 
-    async def revoke_all_for_user(
-        self, db: AsyncSession, *, user_id: UUID
-    ) -> int:
+    async def revoke_all_for_user(self, db: AsyncSession, *, user_id: UUID) -> int:
         """
         Revoke all active tokens for a user across all clients.
 
@@ -123,9 +121,7 @@ class OAuthProviderTokenRepository:
             await db.commit()
         return count
 
-    async def cleanup_expired(
-        self, db: AsyncSession, *, cutoff_days: int = 7
-    ) -> int:
+    async def cleanup_expired(self, db: AsyncSession, *, cutoff_days: int = 7) -> int:
         """
         Delete expired refresh tokens older than cutoff_days.
 

backend/app/repositories/organization.py

@@ -22,7 +22,9 @@ from app.schemas.organizations import (
 logger = logging.getLogger(__name__)
 
 
-class OrganizationRepository(BaseRepository[Organization, OrganizationCreate, OrganizationUpdate]):
+class OrganizationRepository(
+    BaseRepository[Organization, OrganizationCreate, OrganizationUpdate]
+):
     """Repository for Organization model."""
 
     async def get_by_slug(self, db: AsyncSession, *, slug: str) -> Organization | None:
@@ -55,7 +57,11 @@ class OrganizationRepository(BaseRepository[Organization, OrganizationCreate, Or
         except IntegrityError as e:
             await db.rollback()
             error_msg = str(e.orig) if hasattr(e, "orig") else str(e)
-            if "slug" in error_msg.lower() or "unique" in error_msg.lower() or "duplicate" in error_msg.lower():
+            if (
+                "slug" in error_msg.lower()
+                or "unique" in error_msg.lower()
+                or "duplicate" in error_msg.lower()
+            ):
                 logger.warning(f"Duplicate slug attempted: {obj_in.slug}")
                 raise DuplicateEntryError(
                     f"Organization with slug '{obj_in.slug}' already exists"
@@ -235,7 +241,9 @@ class OrganizationRepository(BaseRepository[Organization, OrganizationCreate, Or
                     await db.refresh(existing)
                     return existing
                 else:
-                    raise DuplicateEntryError("User is already a member of this organization")
+                    raise DuplicateEntryError(
+                        "User is already a member of this organization"
+                    )
 
             user_org = UserOrganization(
                 user_id=user_id,

backend/app/repositories/session.py

@@ -10,7 +10,7 @@ from sqlalchemy import and_, delete, func, select, update
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import joinedload
 
-from app.core.repository_exceptions import InvalidInputError, IntegrityConstraintError
+from app.core.repository_exceptions import IntegrityConstraintError, InvalidInputError
 from app.models.user_session import UserSession
 from app.repositories.base import BaseRepository
 from app.schemas.sessions import SessionCreate, SessionUpdate

backend/app/repositories/user.py

@@ -58,7 +58,9 @@ class UserRepository(BaseRepository[User, UserCreate, UserUpdate]):
             error_msg = str(e.orig) if hasattr(e, "orig") else str(e)
             if "email" in error_msg.lower():
                 logger.warning(f"Duplicate email attempted: {obj_in.email}")
-                raise DuplicateEntryError(f"User with email {obj_in.email} already exists")
+                raise DuplicateEntryError(
+                    f"User with email {obj_in.email} already exists"
+                )
             logger.error(f"Integrity error creating user: {error_msg}")
             raise DuplicateEntryError(f"Database integrity error: {error_msg}")
         except Exception as e: