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    |       |