diff --git a/backend/src/main/resources/db/migration/V35__backfill_fts_search_vector.sql b/backend/src/main/resources/db/migration/V35__backfill_fts_search_vector.sql
new file mode 100644
index 00000000..a8f15f9b
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V35__backfill_fts_search_vector.sql
@@ -0,0 +1,6 @@
+-- Backfill search_vector for all existing documents.
+-- The BEFORE UPDATE trigger (trg_documents_fts, installed by V34) recomputes
+-- the full vector from title, summary, transcription blocks, sender/receiver
+-- names, tags, and location. At backfill time all join tables already contain
+-- data, so "SET title = title" is sufficient to fire the trigger for every row.
+UPDATE documents SET title = title;