friendica-github/doc/database/db_hook.md

Table hook

addon hook registry

Field	Description	Type	Null	Key	Default	Extra
id	sequential ID	int unsigned	YES	PRI	NULL	auto_increment
hook	name of hook	varbinary(100)	YES
file	relative filename of hook handler	varbinary(200)	YES
function	function name of hook handler	varbinary(200)	YES
priority	not yet implemented - can be used to sort conflicts in hook handling by calling handlers in priority order	smallint unsigned	YES		0

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