fix: memory leak caused by many unclosed redis subscriptions (#750)

* fix: memory leak caused by many unclosed redis subscriptions

* chore: address pull request feedback

packages/api/src/router/log.ts

@@ -9,16 +9,13 @@ import { createTRPCRouter, publicProcedure } from "../trpc";
 export const logRouter = createTRPCRouter({
   subscribe: publicProcedure.subscription(() => {
     return observable<LoggerMessage>((emit) => {
-      let isConnectionClosed = false;
-
-      loggingChannel.subscribe((data) => {
-        if (isConnectionClosed) return;
+      const unsubscribe = loggingChannel.subscribe((data) => {
         emit.next(data);
       });
       logger.info("A tRPC client has connected to the logging procedure");
 
       return () => {
-        isConnectionClosed = true;
+        unsubscribe();
       };
     });
   }),