Add tp_feed_entry_linked_obj table Sequence for tp_feed_entry_linked_obj Set uniqueness constraint on (tp_feed_entry_id, object_set_key, object_type, object_id) FK from tp_feed_entry_linked_obj.tp_feed_entry_id to tp_feed_entry.id. FK from tp_feed_entry_linked_obj.created_by to usr.id. Index for tp_feed_entry_linked_obj.created_by. FK from tp_feed_entry_linked_obj.updated_by to usr.id. Index for tp_feed_entry_linked_obj.updated_by.