Fix all 33 ruff linting errors causing CI failures

- Remove unused imports (F401) across 17 files
- Fix f-strings without placeholders (F541) in 3 files
- Add noqa: E712 to SQLAlchemy == True comparisons (valid ORM pattern)
- Preserve alembic side-effect import with noqa: F401

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/pop_puller_to_gmail/sessions/99c3a25f-3479-473d-ac95-9faaa0ddd55b

backend/app/api/v1/endpoints/mail_accounts.py

@@ -7,7 +7,7 @@ from sqlalchemy import select, desc
 
 from app.core.database import get_db
 from app.core.deps import get_current_active_user
-from app.core.security import encrypt_credential, decrypt_credential
+from app.core.security import encrypt_credential
 from app.models.database_models import User, MailAccount
 from app.models.schemas import (
     MailAccountCreate,
@@ -52,7 +52,7 @@ async def create_mail_account(
     if len(existing_accounts) >= max_accounts:
         raise HTTPException(
             status_code=status.HTTP_402_PAYMENT_REQUIRED,
-            detail=f"Account limit reached. Upgrade your subscription to add more accounts.",
+            detail="Account limit reached. Upgrade your subscription to add more accounts.",
         )
 
     # Encrypt password

backend/app/api/v1/endpoints/notifications.py

@@ -1,7 +1,7 @@
 """Notification configuration endpoints"""
 
 from typing import List
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends, status
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
 
@@ -11,7 +11,6 @@ from app.models.database_models import User, NotificationConfig
 from app.models.schemas import (
     NotificationConfigCreate,
     NotificationConfigResponse,
-    NotificationConfigUpdate,
 )
 
 router = APIRouter()

backend/app/api/v1/endpoints/providers.py

@@ -8,7 +8,7 @@ from sqlalchemy import select
 
 from app.core.database import get_db
 from app.core.deps import get_current_active_user
-from app.core.security import encrypt_credential, decrypt_credential
+from app.core.security import encrypt_credential
 from app.core.config import settings
 from app.models.database_models import User, GmailCredential
 from app.models.schemas import (

backend/app/api/v1/endpoints/subscriptions.py

@@ -1,7 +1,7 @@
 """Subscription and payment endpoints"""
 
 from typing import List
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
 
@@ -17,7 +17,7 @@ router = APIRouter()
 async def list_subscription_plans(db: AsyncSession = Depends(get_db)):
     """List all available subscription plans"""
     result = await db.execute(
-        select(SubscriptionPlan).where(SubscriptionPlan.is_active == True)
+        select(SubscriptionPlan).where(SubscriptionPlan.is_active == True)  # noqa: E712
     )
     return result.scalars().all()
 

backend/app/api/v1/endpoints/users.py

@@ -1,12 +1,12 @@
 """User management endpoints"""
 
-from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi import APIRouter, Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.database import get_db
 from app.core.deps import get_current_active_user
 from app.models.database_models import User
-from app.models.schemas import UserResponse, UserDetailResponse, UserUpdate
+from app.models.schemas import UserDetailResponse, UserUpdate
 
 router = APIRouter()