Merge pull request #12861 from overleaf/em-ds-delete-chunk-migration

Better indexes for history chunks deletion

GitOrigin-RevId: 1404f5a0535bc94cb1e9d7fc2ea66fd90f584fea

services/web/migrations/20230428154643_history_chunks_garbage_collection_index.js

@@ -0,0 +1,58 @@
+/* eslint-disable no-unused-vars */
+
+const Helpers = require('./lib/helpers')
+
+exports.tags = ['server-ce', 'server-pro', 'saas']
+
+const oldIndexes = [
+  {
+    key: {
+      state: 1,
+    },
+    name: 'state_1',
+    partialFilterExpression: {
+      state: 'deleted',
+    },
+  },
+  {
+    key: {
+      state: -1,
+    },
+    name: 'state_pending',
+    partialFilterExpression: {
+      state: 'pending',
+    },
+  },
+]
+const newIndexes = [
+  {
+    key: {
+      updatedAt: 1,
+    },
+    name: 'deleted_updated_at',
+    partialFilterExpression: {
+      state: 'deleted',
+    },
+  },
+  {
+    key: {
+      updatedAt: -1,
+    },
+    name: 'pending_updated_at',
+    partialFilterExpression: {
+      state: 'pending',
+    },
+  },
+]
+
+exports.migrate = async client => {
+  const { db } = client
+  await Helpers.addIndexesToCollection(db.projectHistoryChunks, newIndexes)
+  await Helpers.dropIndexesFromCollection(db.projectHistoryChunks, oldIndexes)
+}
+
+exports.rollback = async client => {
+  const { db } = client
+  await Helpers.addIndexesToCollection(db.projectHistoryChunks, oldIndexes)
+  await Helpers.dropIndexesFromCollection(db.projectHistoryChunks, newIndexes)
+}