fix: replace deprecated datetime.utcnow with timezone-aware datetime.now in all modules and fix comment count query column name

devplacepy/services/base.py

@@ -2,7 +2,7 @@ import asyncio
 import logging
 from abc import ABC, abstractmethod
 from collections import deque
-from datetime import datetime
+from datetime import datetime, timezone
 
 logger = logging.getLogger(__name__)
 
@@ -34,11 +34,11 @@ class BaseService(ABC):
     def uptime(self) -> str | None:
         if self._started_at is None:
             return None
-        delta = datetime.utcnow() - self._started_at
+        delta = datetime.now(timezone.utc) - self._started_at
         return str(delta).split(".")[0]
 
     def log(self, message: str) -> None:
-        stamp = datetime.utcnow().strftime("%H:%M:%S")
+        stamp = datetime.now(timezone.utc).strftime("%H:%M:%S")
         entry = f"[{stamp}] {message}"
         self.log_buffer.append(entry)
         logger.info(f"[{self.name}] {message}")
@@ -49,11 +49,11 @@ class BaseService(ABC):
 
     async def _run_loop(self) -> None:
         self._running = True
-        self._started_at = datetime.utcnow()
+        self._started_at = datetime.now(timezone.utc)
         self.log(f"Service started (interval={self.interval_seconds}s)")
         while self._running:
             try:
-                self._last_run = datetime.utcnow().isoformat()
+                self._last_run = datetime.now(timezone.utc).isoformat()
                 self._next_run = None
                 await self.run_once()
             except asyncio.CancelledError:
@@ -63,7 +63,7 @@ class BaseService(ABC):
                 self.log(f"Error in run_once: {e}")
             if not self._running:
                 break
-            self._next_run = datetime.utcnow().isoformat()
+            self._next_run = datetime.now(timezone.utc).isoformat()
             self.log(f"Sleeping for {self.interval_seconds}s")
             try:
                 await asyncio.sleep(self.interval_seconds)