Improved database connection and logging:

Robust ping/reconnect: get_db() now retries ping multiple times and safely recreates the pool once per request.
Healthcheck thread: background daemon periodically pings connections and recreates the pool if needed.
Logging improvements: early pool creation and healthcheck logs appear via proper logger setup.

src/main.py

@@ -1,15 +1,16 @@
 from fastapi import FastAPI, Depends, HTTPException, Response, Request
 import uvicorn
 from contextlib import asynccontextmanager
-from db import get_db, create_connection_pool, close_connection_pool
-import logging
+from db import get_db, create_connection_pool, close_connection_pool, start_healthcheck_thread
+from logger_handler import setup_logger
 from feed_handler import grab_latest_chapter_information
 from send_notification import send_notification
 from metrics_server import REQUEST_COUNTER
 import asyncio
 
 
-logger = logging.getLogger(__name__)
+logger = setup_logger(__name__)
+
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
@@ -18,6 +19,9 @@ async def lifespan(app: FastAPI):
 	logger.info("Creating MySQL connection pool...")
 	create_connection_pool()
 
+	start_healthcheck_thread()
+	logger.info("MySQL healthcheck thread started.")
+
 	yield
 	logger.info("Closing MySQL connection pool...")
 	close_connection_pool()