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 | |
+------------------+---------------------+------+-----+-------------------+-----------------------------+