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/alembic/env.py

@@ -11,7 +11,7 @@ sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
 from app.core.config import settings
 from app.core.database import Base
-from app.models import database_models  # Import all models
+from app.models import database_models  # noqa: F401 - Import all models for Alembic
 
 # this is the Alembic Config object
 config = context.config

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()
 

backend/app/core/config.py

@@ -5,7 +5,7 @@ Supports environment variables and .env files.
 
 from typing import Optional, List
 from pydantic_settings import BaseSettings, SettingsConfigDict
-from pydantic import PostgresDsn, field_validator, ValidationInfo
+from pydantic import field_validator
 
 
 class Settings(BaseSettings):

backend/app/core/deps.py

@@ -17,7 +17,7 @@ from app.core.security import decode_token
 from app.models.database_models import User
 
 # OAuth2 scheme for token authentication
-oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"/api/v1/auth/login", auto_error=False)
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login", auto_error=False)
 http_bearer = HTTPBearer(auto_error=False)
 
 

backend/app/main.py

@@ -4,8 +4,6 @@ Main FastAPI application.
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.middleware.trustedhost import TrustedHostMiddleware
-from fastapi.responses import JSONResponse
 import logging
 
 from app.core.config import settings
@@ -68,7 +66,7 @@ def create_application() -> FastAPI:
         """Run on application startup"""
         logger.info(f"Starting {settings.APP_NAME} v{settings.APP_VERSION}")
         logger.info(f"Debug mode: {settings.DEBUG}")
-        logger.info(f"API documentation: /api/docs")
+        logger.info("API documentation: /api/docs")
 
     @app.on_event("shutdown")
     async def shutdown_event():

backend/app/models/database_models.py

@@ -3,7 +3,6 @@ Database models for the multi-tenant POP3 forwarder application.
 """
 
 from datetime import datetime
-from typing import Optional
 from sqlalchemy import (
     Column,
     Integer,

backend/app/models/schemas.py

@@ -4,7 +4,7 @@ Pydantic schemas for API request/response validation.
 
 from datetime import datetime
 from typing import Optional, Dict, Any, List
-from pydantic import BaseModel, EmailStr, Field, validator
+from pydantic import BaseModel, EmailStr, Field
 from enum import Enum
 
 

backend/app/services/auth_service.py

@@ -2,8 +2,7 @@
 OAuth2 authentication service for Google and other providers.
 """
 
-from typing import Dict, Any, Optional
-from datetime import datetime
+from typing import Dict, Any
 import httpx
 from authlib.integrations.starlette_client import OAuth
 from fastapi import HTTPException, status

backend/app/services/mail_processor.py

@@ -12,12 +12,10 @@ from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
 from email.utils import formatdate, make_msgid
 from typing import List, Dict, Any, Optional, Tuple
-from datetime import datetime
 import logging
 from aioimaplib import aioimaplib
 
 from app.models.database_models import MailAccount, MailProtocol
-from app.core.config import settings
 
 logger = logging.getLogger(__name__)
 

backend/app/workers/tasks.py

@@ -5,7 +5,6 @@ Celery tasks for background email processing.
 import asyncio
 import os
 from datetime import datetime, timedelta
-from typing import List
 from celery import Task
 import logging
 
@@ -24,7 +23,6 @@ from app.services.mail_processor import MailProcessor
 from app.services.gmail_service import GmailService, GmailInjectionError
 from app.core.config import settings
 from sqlalchemy import select, and_
-from sqlalchemy.ext.asyncio import AsyncSession
 
 logger = logging.getLogger(__name__)
 
@@ -94,7 +92,7 @@ async def process_mail_account(account_id: int):
                 gmail_cred_result = await db.execute(
                     select(GmailCredential).where(
                         GmailCredential.user_id == account.user_id,
-                        GmailCredential.is_valid == True,
+                        GmailCredential.is_valid == True,  # noqa: E712
                     )
                 )
                 gmail_cred = gmail_cred_result.scalar_one_or_none()
@@ -222,7 +220,7 @@ async def process_all_enabled_accounts():
             result = await db.execute(
                 select(MailAccount).where(
                     and_(
-                        MailAccount.is_enabled == True,
+                        MailAccount.is_enabled == True,  # noqa: E712
                         MailAccount.status.in_(
                             [AccountStatus.ACTIVE, AccountStatus.TESTING]
                         ),

backend/tests/conftest.py

@@ -3,8 +3,7 @@ Test configuration and fixtures.
 """
 
 import pytest
-import asyncio
-from typing import AsyncGenerator, Generator
+from typing import AsyncGenerator
 from httpx import AsyncClient
 from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
 from sqlalchemy.pool import NullPool

backend/tests/unit/test_gmail_service.py

@@ -3,7 +3,7 @@ Unit tests for Gmail service module.
 """
 
 import pytest
-from unittest.mock import MagicMock, patch, AsyncMock
+from unittest.mock import MagicMock
 from app.services.gmail_service import GmailService, GmailInjectionError, GMAIL_SCOPES
 
 

backend/tests/unit/test_provider_presets.py

@@ -2,7 +2,6 @@
 Unit tests for provider presets and mail server auto-detection.
 """
 
-import pytest
 from app.services.mail_processor import MailServerAutoDetect