CREATE TABLE push_session (
    username text NOT NULL,
    server_host text NOT NULL,
    timestamp bigint NOT NULL,
    service text NOT NULL,
    node text NOT NULL,
    xml text NOT NULL,
    PRIMARY KEY (server_host(191), username(191), timestamp)
);

CREATE UNIQUE INDEX i_push_session_susn ON push_session (server_host(191), username(191), service(191), node(191));