| ------------ | --------------------------------- | ------------------ | ---- | --- | ------------------- | -------------- |
| id | sequential ID | int unsigned | NO | PRI | NULL | auto_increment |
| uid | User id | mediumint unsigned | NO | | 0 | |
-| callback_url | | varchar(255) | NO | | | |
+| callback_url | | varbinary(383) | NO | | | |
| topic | | varchar(255) | NO | | | |
| nickname | | varchar(255) | NO | | | |
| push | Retrial counter | tinyint | NO | | 0 | |