{8}{7}
| Field | Description | Type | Null | Key | Default | Extra |
|---|---|---|---|---|---|---|
| id | sequential ID | int(11) | NO | PRI | NULL | auto_increment |
| iid | item.id of the referenced item | int(11) | NO | MUL | 0 | |
| uid | user.id of the owner of this data | int(11) | NO | MUL | 0 | |
| sid | an additional identifier to attach or link to the referenced item (often used to store a message_id from another system in order to suppress duplicates) | varchar(255) | NO | MUL | ||
| service | the name or description of the service which generated this identifier | varchar(255) | NO | MUL |
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