Extension:Echo/echo_push_subscription table

mysql> describe echo_push_subscription;
+------------------+---------------------+------+-----+-------------------+-----------------------------+
| Field            | Type                | Null | Key | Default           | Extra                       |
+------------------+---------------------+------+-----+-------------------+-----------------------------+
| eps_id           | int(10) unsigned    | NO   | PRI | NULL              | auto_increment              |
| eps_user         | int(10) unsigned    | NO   | MUL | NULL              |                             |
| eps_token        | blob                | NO   | MUL | NULL              |                             |
| eps_token_sha256 | binary(64)          | NO   | UNI | NULL              |                             |
| eps_provider     | tinyint(3) unsigned | NO   | MUL | NULL              |                             |
| eps_updated      | timestamp           | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| eps_data         | blob                | YES  |     | NULL              |                             |
| eps_topic        | tinyint(3) unsigned | YES  | MUL | NULL              |                             |
+------------------+---------------------+------+-----+-------------------+-----------------------------+