barcodes
	barcode_id primary key auto increment
	account_id integer not null; reference to accounts.account_id
	barcode varchar(255) not null

	unique barcode + accound_id
		don't repeat barcode for that account

parts
	part_id primary key auto increment
	part_name varchar 1024 not null
	account_id integer not null; reference
	notes varchar 1024 null

	unique part_name + account_id
		don't repeat part name for that account

part_barcodes
	part_id reference to parts.part_id
	account_id reference to accounts.account_id
	barcode_id reference to barcodes.barcode_id

	part_id + account_id unique
		don't repeat part for that account; only one barcode per part

product_barcodes
	catalogid
	barcode_id
	account_id
	quantity
	notes
	option_set_id_1 NULL
	option_id_1 NULL
	...

	catalogid + account_id + option_set_id_1 + option_id_1 + ... unique
		don't repeat product for that account; only one barcode per product

product_components
	account_id
	type
	catalogid
	child_component_id
	quantity
	option_set_id_1 NULL
	option_id_1 NULL
	...

	account_id type catalogid child_component_id unique
		don't repeat components for that product