-- The embedding contract the stored vectors were built under (#189): one
-- row, written on first start (or by reembed_embeddings), compared with the
-- resolved [embedding] config at startup.
CREATE TABLE embedding_contract (
    id INTEGER PRIMARY KEY NOT NULL CHECK (id = 1),
    backend TEXT NOT NULL,
    model TEXT NOT NULL,
    dim INTEGER NOT NULL,
    query_prefix TEXT NOT NULL,
    document_prefix TEXT NOT NULL,
    recorded_at BIGINT NOT NULL
);