Add id column as primary key for unique_id_users

This is required for Elide to use this as a entity and get access to the timestamps.

Author: Brutus5000

migrations/V140__add_id_to_unique_id_users.sql

@@ -0,0 +1,5 @@
+alter table unique_id_users
+    drop primary key;
+
+alter table unique_id_users
+    add id int auto_increment first primary key;