make key on expires non-unique

db_scripts/diff/10728.down

@@ -0,0 +1,4 @@
+use kamailio
+
+ALTER TABLE pua DROP KEY `expires_idx`;
+ALTER TABLE pua ADD UNIQUE KEY `expires_idx` (`expires`);

db_scripts/diff/10728.up

@@ -0,0 +1,4 @@
+use kamailio
+
+ALTER TABLE pua DROP KEY `expires_idx`;
+ALTER TABLE pua ADD KEY `expires_idx` (`expires`);