loopdb: add deposit indices

Author: hieblmi

loopdb/sqlc/migrations/000010_static_address_deposits.up.sql

@@ -45,4 +45,6 @@ CREATE TABLE IF NOT EXISTS deposit_updates (
 
     -- update_timestamp is the timestamp of the update.
     update_timestamp TIMESTAMP NOT NULL
-);
+);
+
+CREATE INDEX IF NOT EXISTS deposit_updates_id_timestamp_index ON deposit_updates(deposit_id, update_timestamp DESC);