fix(backend): a session or bot that fails to start is retried and the failure is logged

backend/src/watcher/runner.py

@@ -20,8 +20,10 @@ RETRY_INTERVAL = 300
 async def _retry_loop(registry: BotRegistry) -> None:
     while True:
         await asyncio.sleep(RETRY_INTERVAL)
-        with contextlib.suppress(Exception):
+        try:
             await registry.sync()
+        except Exception:
+            logger.exception("[red]Bot sync failed[/]")
 
 
 def _change_listener(registry: BotRegistry, tasks: set[asyncio.Task]) -> Listener: