friendica-github/doc/database/db_cache.md

Table cache
===========

Stores temporary data

Fields
------

| Field   | Description                  | Type           | Null | Key | Default             | Extra |
| ------- | ---------------------------- | -------------- | ---- | --- | ------------------- | ----- |
| k       | cache key                    | varbinary(255) | NO   | PRI | NULL                |       |
| v       | cached serialized value      | mediumtext     | YES  |     | NULL                |       |
| expires | datetime of cache expiration | datetime       | NO   |     | 0001-01-01 00:00:00 |       |
| updated | datetime of cache insertion  | datetime       | NO   |     | 0001-01-01 00:00:00 |       |

Indexes
------------

| Name      | Fields     |
| --------- | ---------- |
| PRIMARY   | k          |
| k_expires | k, expires |


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