friendica/doc/database/db_cache.md

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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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