Improve TrendsDB, add loopback script, almost ready to do something?

src/loopback.ts

@@ -0,0 +1,24 @@
+import { Conf } from '@/config.ts';
+import { relayInit, Sqlite } from '@/deps.ts';
+import { TrendsDB } from '@/trends.ts';
+
+const db = new Sqlite('data/trends.sqlite3');
+const trends = new TrendsDB(db);
+
+const relay = relayInit(Conf.relay);
+await relay.connect();
+
+const sub = relay.sub([{ kinds: [1] }]);
+
+sub.on('eose', sub.unsub);
+sub.on('event', (event) => {
+  const tags = event.tags
+    .filter((tag) => tag[0] === 't')
+    .map((tag) => tag[1]);
+
+  try {
+    trends.addTagUsages(event.pubkey, tags);
+  } catch (_e) {
+    // do nothing
+  }
+});