friendica/doc/database/db_cache.md

Table cache

Stores temporary data

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

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