Use Postgres state DB for Telegram profile updates

telegram_backend/src/index.ts

@@ -1,4 +1,5 @@
 import { startServer } from "./server";
+import { closeProfileState } from "./profile-state";
 
 const server = startServer();
 
@@ -15,8 +16,9 @@ async function shutdown(signal: string) {
         resolve();
       });
     });
+    await closeProfileState();
   } catch {
-    // ignore shutdown errors
+    // ignore shutdown errors during termination
   }
 
   process.exit(0);