friendica/doc/database/db_attach.md

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Table attach
===========
file attachments
Fields
------
| Field | Description | Type | Null | Key | Default | Extra |
| ------------- | ----------------------------------------------------- | ------------------ | ---- | --- | ------------------- | -------------- |
| id | generated index | int unsigned | NO | PRI | NULL | auto_increment |
| uid | Owner User id | mediumint unsigned | NO | | 0 | |
| hash | hash | varchar(64) | NO | | | |
| filename | filename of original | varchar(255) | NO | | | |
| filetype | mimetype | varchar(64) | NO | | | |
| filesize | size in bytes | int unsigned | NO | | 0 | |
| data | file data | longblob | NO | | NULL | |
| created | creation time | datetime | NO | | 0001-01-01 00:00:00 | |
| edited | last edit time | datetime | NO | | 0001-01-01 00:00:00 | |
| allow_cid | Access Control - list of allowed contact.id '<19><78> | mediumtext | YES | | NULL | |
| allow_gid | Access Control - list of allowed groups | mediumtext | YES | | NULL | |
| deny_cid | Access Control - list of denied contact.id | mediumtext | YES | | NULL | |
| deny_gid | Access Control - list of denied groups | mediumtext | YES | | NULL | |
| backend-class | Storage backend class | tinytext | YES | | NULL | |
| backend-ref | Storage backend data reference | text | YES | | NULL | |
Indexes
------------
| Name | Fields |
| ------- | ------ |
| PRIMARY | id |
| uid | uid |
Foreign Keys
------------
| Field | Target Table | Target Field |
|-------|--------------|--------------|
| uid | [user](help/database/db_user) | uid |
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