Extension:LiquidThreads/user message state table

mysql> describe user_message_state;
+--------------------+------------------+------+-----+---------+-------+
| Field              | Type             | Null | Key | Default | Extra |
+--------------------+------------------+------+-----+---------+-------+
| ums_user           | int(10) unsigned | NO   | PRI | NULL    |       |
| ums_thread         | int(8) unsigned  | NO   | PRI | NULL    |       |
| ums_conversation   | int(8) unsigned  | NO   |     | 0       |       |
| ums_read_timestamp | varbinary(14)    | YES  |     | NULL    |       |
+--------------------+------------------+------+-----+---------+-------+