friendica/doc/database/db_attach.md

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 circles              | mediumtext         | YES  |     | NULL                |                |
| deny_cid      | Access Control - list of denied contact.id            | mediumtext         | YES  |     | NULL                |                |
| deny_gid      | Access Control - list of denied circles               | 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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