===========
post relation to categories
-| Field | Description | Type | Null | Key | Default | Extra |
-| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned | YES | PRI | | |
-| uid | User id | mediumint unsigned | YES | PRI | 0 | |
-| type | | tinyint unsigned | YES | PRI | 0 | |
-| tid | | int unsigned | YES | PRI | 0 | |
+| Field | Description | Type | Null | Key | Default | Extra |
+| ------ | --------------------------------------------------------- | ------------------ | ---- | --- | ------- | ----- |
+| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned | NO | PRI | NULL | |
+| uid | User id | mediumint unsigned | NO | PRI | 0 | |
+| type | | tinyint unsigned | NO | PRI | 0 | |
+| tid | | int unsigned | NO | PRI | 0 | |
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