5bd303788b
A list is a standing set of short strings under a tag. Not a task, because milk is not work and the prioritiser must not count it as an errand; not a fact, because it claims nothing. Nothing predicates over it, so two people adding to the same list at once costs nothing. Migration #19, plus AddListItem, ListItems, SetListItemStatus and ClearList. The live-only unique index is the tasks one, per list: молоко twice before the shop is one row, молоко again after it was crossed off is a new one.