User subscription to a forum. When a user subscribes to a forum he/she will receive emails of any posts in this forum
| Column | Type | References | Comments |
|---|---|---|---|
| id | Integer | Primary key | |
| vdb_id | Integer | ||
| created | Date | ||
| forum_id | Integer | db_forum.id | Forum subscribed to |
| user_id | Integer | db_user.id | ID of the subscriber |