DROP TABLE "cache";
DROP TABLE "cache_shared";

CREATE TABLE "cache" (
    user_id integer NOT NULL
        REFERENCES users (user_id) ON DELETE CASCADE ON UPDATE CASCADE,
    cache_key varchar(128) DEFAULT '' NOT NULL,
    expires timestamp with time zone DEFAULT NULL,
    data text NOT NULL,
    PRIMARY KEY (user_id, cache_key)
);

CREATE INDEX cache_expires_idx ON "cache" (expires);

CREATE TABLE "cache_shared" (
    cache_key varchar(255) NOT NULL PRIMARY KEY,
    expires timestamp with time zone DEFAULT NULL,
    data text NOT NULL
);

CREATE INDEX cache_shared_expires_idx ON "cache_shared" (expires);