-- Reusing answers, for a project that asks: how long one is reused, and
-- whether any request's answer is, or only those that come out the same
-- every time (temperature 0, or a seed). Off for every project until set.
-- The answers themselves are held in each gateway's memory, never here.
ALTER TABLE projects ADD COLUMN cache_ttl_seconds INTEGER;
ALTER TABLE projects ADD COLUMN cache_any INTEGER NOT NULL DEFAULT 0;

-- A request answered from that cache: nothing was generated for it, so it
-- carries no tokens and costs nothing, and this says why.
ALTER TABLE usage ADD COLUMN cache_hit INTEGER NOT NULL DEFAULT 0;