diff --git a/migrations/074-unique-lock-update.sql b/migrations/074-unique-lock-update.sql
new file mode 100644
index 0000000..135cef8
--- /dev/null
+++ b/migrations/074-unique-lock-update.sql
@@ -0,0 +1,5 @@
+-- existing contraint is (log_index, tx_id) and this does not work with multi-send transactions from gnosis safe
+ALTER TABLE dschief.delegate_lock DROP CONSTRAINT delegate_lock_log_index_tx_id_key;
+
+-- add a new constraint that includes the lock value and the from_address (delegate contract)
+ALTER TABLE dschief.delegate_lock ADD CONSTRAINT delegate_lock_key UNIQUE (log_index, tx_id, from_address, lock);
\ No newline at end of file