Constant mz_stash::postgres::SCHEMA

const SCHEMA: &str = "
CREATE TABLE fence (
    epoch bigint PRIMARY KEY,
    nonce bytea,
    version bigint DEFAULT 1 NOT NULL
);
-- Epochs and versions are guaranteed to be non-zero, so start counting at 1.
INSERT INTO fence (epoch, nonce, version) VALUES (1, '', 1);

-- bigserial is not ideal for Cockroach, but we have a stable number of
-- collections, so our use of it here is fine and compatible with Postgres.
CREATE TABLE collections (
    collection_id bigserial PRIMARY KEY,
    name text NOT NULL UNIQUE
);

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

CREATE INDEX data_time_idx ON data (collection_id, time);

CREATE TABLE sinces (
    collection_id bigint PRIMARY KEY REFERENCES collections (collection_id),
    since bigint
);

CREATE TABLE uppers (
    collection_id bigint PRIMARY KEY REFERENCES collections (collection_id),
    upper bigint
);
";