Extension:Translate/translate cache table

mysql> describe translate_cache;
+------------+----------------+------+-----+---------+-------+
| Field      | Type           | Null | Key | Default | Extra |
+------------+----------------+------+-----+---------+-------+
| tc_key     | varbinary(255) | NO   | PRI | NULL    |       |
| tc_value   | mediumblob     | YES  |     | NULL    |       |
| tc_exptime | binary(14)     | YES  |     | NULL    |       |
| tc_tag     | varbinary(255) | YES  | MUL | NULL    |       |
+------------+----------------+------+-----+---------+-------+