refactor: apply consistent formatting and improve code readability across backend modules

backend/app/main.py

@@ -12,22 +12,37 @@ The application uses SQLite for data storage and APScheduler for scheduling peri
 import asyncio
 import os
 import sqlite3
+import time
 from datetime import datetime, timedelta, timezone
-from http.client import HTTPException
 from typing import Any, Dict, List, Union
 
 # Third-party imports
 import httpx
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.interval import IntervalTrigger
-from fastapi import Depends, FastAPI, Response, status
+from fastapi import Depends, FastAPI, HTTPException, Response, status
 from fastapi.staticfiles import StaticFiles
 
-from backend.app.config import logger, OLLAMA_HOST, CRON_HOURS, MIN_CRON_HOURS, \
-    SYNC_COOLDOWN_MINUTES, LLM_MODEL, OLLAMA_API_TIMEOUT_SECONDS, frontend_path
+from backend.app.config import (
+    CRON_HOURS,
+    LLM_MODEL,
+    MIN_CRON_HOURS,
+    OLLAMA_API_TIMEOUT_SECONDS,
+    OLLAMA_HOST,
+    SYNC_COOLDOWN_MINUTES,
+    frontend_path,
+    logger,
+)
 from backend.app.database import get_db, get_db_write
-from backend.app.models import TimestampResponse, SuccessResponse, FeedData, ModelStatus, ErrorResponse, HoursResponse, \
-    CronSettings
+from backend.app.models import (
+    CronSettings,
+    ErrorResponse,
+    FeedData,
+    HoursResponse,
+    ModelStatus,
+    SuccessResponse,
+    TimestampResponse,
+)
 from backend.app.services import NewsFetcher
 
 app = FastAPI(
@@ -88,7 +103,8 @@ async def get_news(
         return [dict(row) for row in db.fetchall()]
 
     except ValueError:
-        raise HTTPException(400, "Invalid date format. Use ISO format (YYYY-MM-DD)")
+        raise HTTPException(
+            400, "Invalid date format. Use ISO format (YYYY-MM-DD)")
     except Exception as e:
         logger.error(f"❌ Error fetching news: {e}")
         raise HTTPException(
@@ -244,8 +260,7 @@ async def manual_sync(db: sqlite3.Cursor = Depends(get_db)):
     if now - last_sync_time < timedelta(minutes=SYNC_COOLDOWN_MINUTES):
         return Response(
             status_code=status.HTTP_429_TOO_MANY_REQUESTS,
-            content="Sync was triggered too recently. Please wait before triggering again."
-        )
+            content="Sync was triggered too recently. Please wait before triggering again.")
 
     try:
         task = asyncio.create_task(NewsFetcher.harvest_feeds())
@@ -281,7 +296,9 @@ async def get_cron_schedule(db: sqlite3.Cursor = Depends(get_db)):
 
 
 @app.post("/settings/cron", response_model=HoursResponse)
-async def update_cron_schedule(data: CronSettings, db: sqlite3.Cursor = Depends(get_db_write)):
+async def update_cron_schedule(
+        data: CronSettings,
+        db: sqlite3.Cursor = Depends(get_db_write)):
     """
     Update the cron schedule for harvesting news.