better unsubscribe, startup stagger

src/main.ts

@@ -3,6 +3,7 @@ import { NestFactory } from '@nestjs/core';
 import { FastifyAdapter, NestFastifyApplication } from '@nestjs/platform-fastify';
 import * as bitcoinjs from 'bitcoinjs-lib';
 import { useContainer } from 'class-validator';
+import { setTimeout } from 'timers/promises';
 import * as ecc from 'tiny-secp256k1';
 
 import { AppModule } from './app.module';
@@ -20,6 +21,13 @@ async function bootstrap() {
   // };
 
   //const app = await NestFactory.create<NestFastifyApplication>(AppModule, new FastifyAdapter({ https: httpsOptions }));
+
+  // stagger startup
+  if (process.env.NODE_APP_INSTANCE != null) {
+    await setTimeout(parseInt(process.env.NODE_APP_INSTANCE) * 5000);
+  }
+
+
   const app = await NestFactory.create<NestFastifyApplication>(AppModule, new FastifyAdapter());
   app.setGlobalPrefix('api')
   app.useGlobalPipes(