friendica/doc/database/db_locks.md

Table locks

Field	Description	Type	Null	Key	Default	Extra
id	sequential ID	int unsigned	YES	PRI		auto_increment
name		varchar(128)	YES
locked		boolean	YES		0
pid	Process ID	int unsigned	YES		0
expires	datetime of cache expiration	datetime	YES		0001-01-01 00:00:00

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