// repair_queue contains items that should be repaired.
model repair_queue (
	table repair_queue

	key stream_id position

	// stream_id is uuid that refers to segments.stream_id column.
	field stream_id blob
	// position is a segment location that refers to segments.position column.
	field position uint64
	// attempted_at indicates the last time repair was tried.
	field attempted_at timestamp (updatable, nullable)
	// updated_at indicates when this row was last added (or re-added) to the queue.
	field updated_at timestamp ( updatable, default current_timestamp )
	// inserted_at indicate when this segment ended up in the repair queue the first time.
	field inserted_at timestamp ( default current_timestamp )
	// segment_health corresponds to the importance of this segment getting repaired.
	// Lower health segments should be repaired first. See repair.SegmentHealth for more details.
	field segment_health float64 (default 1)
	// placement of the segment to be repaired.
	field placement int (nullable, updatable)

	// this index is used for efficient deletes of old entries.
	index (
		fields updated_at
	)

	// this index is used to efficiently find the segments that are most in
	// danger becoming irreparable.
	index (
		name repair_queue_num_healthy_pieces_attempted_at_index
		fields segment_health attempted_at
	)

	// this index is used for efficient deletes of old entries.
	index (
		fields placement
	)
)

delete repair_queue ( where repair_queue.updated_at < ? )