const SCHEMA: &'static str = "
CREATE TABLE collections (
    collection_id integer PRIMARY KEY,
    name text NOT NULL UNIQUE
);

CREATE TABLE data (
    collection_id integer NOT NULL REFERENCES collections (collection_id),
    key blob NOT NULL,
    value blob NOT NULL,
    time integer NOT NULL,
    diff integer NOT NULL
);

CREATE INDEX data_time_idx ON data (collection_id, time);

CREATE TABLE sinces (
    collection_id NOT NULL UNIQUE REFERENCES collections (collection_id),
    since integer
);

CREATE TABLE uppers (
    collection_id NOT NULL UNIQUE REFERENCES collections (collection_id),
    upper integer
);
";