refactor chat delivery to graphql + hatchet services

telegram_backend/src/index.ts

@@ -0,0 +1,31 @@
+import { startServer } from "./server";
+
+const server = startServer();
+
+async function shutdown(signal: string) {
+  console.log(`[telegram_backend] shutting down by ${signal}`);
+
+  try {
+    await new Promise<void>((resolve, reject) => {
+      server.close((error) => {
+        if (error) {
+          reject(error);
+          return;
+        }
+        resolve();
+      });
+    });
+  } catch {
+    // ignore shutdown errors
+  }
+
+  process.exit(0);
+}
+
+process.on("SIGINT", () => {
+  void shutdown("SIGINT");
+});
+
+process.on("SIGTERM", () => {
+  void shutdown("SIGTERM");
+});