diff --git a/migrations/20260601000001_init.sql b/migrations/20260601000001_init.sql
index f8b7e61..9e3c22b 100644
--- a/migrations/20260601000001_init.sql
+++ b/migrations/20260601000001_init.sql
@@ -27,6 +27,3 @@ CREATE INDEX IF NOT EXISTS idx_chat_records_user_created
 
 CREATE INDEX IF NOT EXISTS idx_chat_records_account_created
     ON chat_records (account_id, created_at DESC);
-
-CREATE UNIQUE INDEX IF NOT EXISTS idx_chat_records_message_id
-    ON chat_records (message_id) WHERE message_id != '';