diff --git a/backend/migrations/20260405151839_add_resource_cache_expire_index.down.sql b/backend/migrations/20260405151839_add_resource_cache_expire_index.down.sql
new file mode 100644
index 0000000000..8e71d40f0b
--- /dev/null
+++ b/backend/migrations/20260405151839_add_resource_cache_expire_index.down.sql
@@ -0,0 +1 @@
+DROP INDEX IF EXISTS idx_resource_cache_expire;
diff --git a/backend/migrations/20260405151839_add_resource_cache_expire_index.up.sql b/backend/migrations/20260405151839_add_resource_cache_expire_index.up.sql
new file mode 100644
index 0000000000..dd3a5989cc
--- /dev/null
+++ b/backend/migrations/20260405151839_add_resource_cache_expire_index.up.sql
@@ -0,0 +1,5 @@
+-- Partial functional index to speed up periodic cleanup of expired cache resources.
+-- Matches the query: DELETE FROM resource WHERE resource_type = 'cache' AND to_timestamp((value->>'expire')::int) < now()
+CREATE INDEX IF NOT EXISTS idx_resource_cache_expire
+    ON resource (to_timestamp((value->>'expire')::int))
+    WHERE resource_type = 'cache';