fix: correct indentation in db_pool try block

app_part1.py

@@ -90,9 +90,9 @@ async def lifespan(app: FastAPI):
     try:
         try:
         db_pool = await init_db_pool()
-        logger.info("Database pool initialized successfully.")
-    except Exception as db_err:
-        logger.error(f"Database pool FAILED: {db_err}")
+        logger.info("Database pool initialized.")
+    except Exception as _db_err:
+        logger.error("Database pool failed: %s", _db_err)
         db_pool = None
         logger.info("Database pool initialized.")
     except Exception as exc: