Attempt to fix memory leak issues

- Piscina was eating lots of memory
- Product frontend/backend could be leaking memory, but if one just
  wants to run a data backup node, then NODE_ENV="reconcile" may now fix
  this

src/launch.mjs

@@ -27,6 +27,9 @@ cache.initializeNotifications();
 const reconcileMode = env.NODE_ENV === "reconcile";
 if (reconcileMode) {
   log(`Running in reconciliation mode`);
+  log(
+    `In reconciliation mode, syncing with the chain and reconciling with the p2p network are enabled. The product backend/frontends are disabled.`,
+  );
 }
 
 const trie = await store.create();
@@ -36,11 +39,11 @@ const node = await start(config);
 if (!reconcileMode) {
   await api.launch(trie, node);
   await http.launch(trie, node);
-
-  crawl(mintCrawlPath);
-  crawl(delegateCrawlPath);
 }
 
+crawl(mintCrawlPath);
+crawl(delegateCrawlPath);
+
 // NOTE: We're passing in the trie here as we don't want to make it globally
 // available to run more than one node in the tests
 messages.handlers.message = messages.handlers.message(trie);

src/store.mjs

@@ -32,6 +32,14 @@ import { triggerNotification } from "./subscriptions.mjs";
 
 const maxReaders = 500;
 
+// NOTE: We're running the launching of Piscina workers on the top of the
+// module as when this is run in a function, and the function is called
+// multiple times then Piscina will continue to spawn more and more workers
+// which fills up the memory fast.
+const piscina = new Piscina({
+  filename: resolve("./src/workers/enhancer.mjs"),
+});
+
 export const upvotes = new Set();
 export const commentCounts = new Map();
 
@@ -552,10 +560,11 @@ export async function posts(
   return posts;
 }
 
+// NOTE: If you're wondering why the enhancer is recreated on each call of
+// posts( and other calls, the reason for it is that we constantly have to
+// re-query accounts and delegations as they're subject to change throughout
+// the application's lifecycle (e.g. when a new person mints/delegates).
 function enhance(accounts, delegations, cacheEnabled) {
-  const piscina = new Piscina({
-    filename: resolve("./src/workers/enhancer.mjs"),
-  });
   return async (node) => {
     const computeFunc = async () =>
       await piscina.run({