chore: Refactor worker, emails and data cleanup to task system (#3337)

* Refactor worker, all emails on task system

* fix

* lint

* fix: Remove a bunch of expect-error comments in related tests

* refactor: Move work from utils.gc into tasks

* test

* Add tracing to tasks and processors
fix: DebounceProcessor triggering on all events
Event.add -> Event.schedule

server/queues/processors/RevisionsProcessor.ts

@@ -0,0 +1,41 @@
+import invariant from "invariant";
+import revisionCreator from "@server/commands/revisionCreator";
+import { APM } from "@server/logging/tracing";
+import { Revision, Document, User } from "@server/models";
+import { DocumentEvent, RevisionEvent, Event } from "@server/types";
+import BaseProcessor from "./BaseProcessor";
+
+@APM.trace()
+export default class RevisionsProcessor extends BaseProcessor {
+  static applicableEvents: Event["name"][] = ["documents.update.debounced"];
+
+  async perform(event: DocumentEvent | RevisionEvent) {
+    switch (event.name) {
+      case "documents.update.debounced": {
+        const document = await Document.findByPk(event.documentId);
+        invariant(document, "Document should exist");
+        const previous = await Revision.findLatest(document.id);
+
+        // we don't create revisions if identical to previous revision, this can
+        // happen if a manual revision was created from another service or user.
+        if (
+          previous &&
+          document.text === previous.text &&
+          document.title === previous.title
+        ) {
+          return;
+        }
+
+        const user = await User.findByPk(event.actorId);
+        invariant(user, "User should exist");
+        await revisionCreator({
+          user,
+          document,
+        });
+        break;
+      }
+
+      default:
+    }
+  }
+}