diff --git a/migrations/0004_fts5_triggers_regen.sql b/migrations/0004_fts5_triggers_regen.sql
new file mode 100644
index 0000000..d7cb785
--- /dev/null
+++ b/migrations/0004_fts5_triggers_regen.sql
@@ -0,0 +1,57 @@
+-- Force re-declaration of FTS5 sync triggers (axis 2 attempt for issue #135)
+--
+-- Layer = L4 Operations (sparse retrieval surface recovery)
+--
+-- Context:
+--   2026-04-28: migration 0003 dropped+recreated search_docs_code_fts to
+--   recover from recurring SQLITE_CORRUPT_VTAB. After 0003 was merged AND
+--   applied via D1 console, production Worker continues to hit
+--   D1_ERROR: SQLITE_CORRUPT_VTAB on every diff upsert (tokenizer_kind=code).
+--   nat_fts surface is clean; code_fts surface persists corrupt across
+--   :30 pollDiffs cron iterations.
+--
+-- Hypothesis:
+--   The AFTER INSERT/UPDATE/DELETE triggers from 0001 were compiled with
+--   references that may need re-resolution after the underlying virtual
+--   table was DROP+CREATEd. Re-declaring the triggers (DROP + CREATE)
+--   forces re-binding to the new search_docs_code_fts.
+--
+-- Scope:
+--   Triggers carry no data (declarative), so this is non-destructive.
+--   Body is byte-for-byte identical to 0001; only the declaration
+--   timing changes.
+--
+-- Idempotency:
+--   DROP IF EXISTS keeps the migration safe to re-run.
+
+DROP TRIGGER IF EXISTS trg_search_docs_ai;
+DROP TRIGGER IF EXISTS trg_search_docs_ad;
+DROP TRIGGER IF EXISTS trg_search_docs_au;
+
+CREATE TRIGGER trg_search_docs_ai AFTER INSERT ON search_docs
+BEGIN
+  INSERT INTO search_docs_nat_fts(rowid, content)
+    SELECT new.rowid, new.content WHERE new.tokenizer_kind = 'nat';
+  INSERT INTO search_docs_code_fts(rowid, content)
+    SELECT new.rowid, new.content WHERE new.tokenizer_kind = 'code';
+END;
+
+CREATE TRIGGER trg_search_docs_ad AFTER DELETE ON search_docs
+BEGIN
+  INSERT INTO search_docs_nat_fts(search_docs_nat_fts, rowid, content)
+    VALUES('delete', old.rowid, old.content);
+  INSERT INTO search_docs_code_fts(search_docs_code_fts, rowid, content)
+    VALUES('delete', old.rowid, old.content);
+END;
+
+CREATE TRIGGER trg_search_docs_au AFTER UPDATE ON search_docs
+BEGIN
+  INSERT INTO search_docs_nat_fts(search_docs_nat_fts, rowid, content)
+    VALUES('delete', old.rowid, old.content);
+  INSERT INTO search_docs_code_fts(search_docs_code_fts, rowid, content)
+    VALUES('delete', old.rowid, old.content);
+  INSERT INTO search_docs_nat_fts(rowid, content)
+    SELECT new.rowid, new.content WHERE new.tokenizer_kind = 'nat';
+  INSERT INTO search_docs_code_fts(rowid, content)
+    SELECT new.rowid, new.content WHERE new.tokenizer_kind = 'code';
+END;