From ae28403f9b0a4a478fb14ec7c5f729c7c862d22a Mon Sep 17 00:00:00 2001
From: Liam O'Brien <l.obrien@digital-science.com>
Date: Fri, 10 Jul 2026 11:53:21 +0100
Subject: [PATCH] New index for querying items in a users synced collection

GitOrigin-RevId: aa81ca46cdd238a46a8002d1c991da787c1b9b0f
---
 ...aryReferences_zotero_collections_index.mjs | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 tools/migrations/20260710120000_create_libraryReferences_zotero_collections_index.mjs

diff --git a/tools/migrations/20260710120000_create_libraryReferences_zotero_collections_index.mjs b/tools/migrations/20260710120000_create_libraryReferences_zotero_collections_index.mjs
new file mode 100644
index 0000000000..a2d52d38cf
--- /dev/null
+++ b/tools/migrations/20260710120000_create_libraryReferences_zotero_collections_index.mjs
@@ -0,0 +1,36 @@
+import Helpers from './lib/helpers.mjs'
+
+const tags = ['saas']
+
+// Supports the moved-out-of-collection diff: for a synced collection, find
+// every locally-recorded item whose cached membership includes that
+// collection key, projected down to just itemKey/collections (see
+// findZoteroCollectionMembership in LibraryReferenceRepository.mts).
+const newIndexes = [
+  {
+    key: {
+      userId: 1,
+      'sources.zotero.libraryType': 1,
+      'sources.zotero.libraryId': 1,
+      'sources.zotero.collections': 1,
+    },
+    name: 'userId_1_sources.zotero.libraryType_1_sources.zotero.libraryId_1_sources.zotero.collections_1',
+    partialFilterExpression: { 'sources.zotero.itemKey': { $exists: true } },
+  },
+]
+
+const migrate = async client => {
+  const { db } = client
+  await Helpers.addIndexesToCollection(db.libraryReferences, newIndexes)
+}
+
+const rollback = async client => {
+  const { db } = client
+  await Helpers.dropIndexesFromCollection(db.libraryReferences, newIndexes)
+}
+
+export default {
+  tags,
+  migrate,
+  rollback,
+}