friendica/doc/database/db_item-uri.md

Table item-uri
===========
URI and GUID for items

| Field | Description | Type | Null | Key | Default | Extra |
| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
| id |  | int unsigned | NO | PRI | NULL | auto_increment |    
| uri | URI of an item | varbinary(255) | NO |  | NULL |  |    
| guid | A unique identifier for an item | varbinary(255) | YES |  | NULL |  |    

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