CREATE TYPE xbus_emission_status AS ENUM (
    'pending',
    'sent',
    'running',
    'done',
    'error'
);

CREATE TABLE xbus_emission_queue (
    id SERIAL PRIMARY KEY,
    created TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
    msgtype TEXT NOT NULL,
    content bytea NULL,
    chunks bytea[] NULL,
    related_to character varying NOT NULL DEFAULT '{}',
    envelope_id uuid NULL,
    process_id uuid NULL,
    status xbus_emission_status DEFAULT 'pending'::xbus_emission_status NOT NULL,
    log text DEFAULT ''::text NOT NULL,
    date_sent TIMESTAMP WITHOUT TIME ZONE NULL,
    date_running TIMESTAMP WITHOUT TIME ZONE NULL,
    date_done TIMESTAMP WITHOUT TIME ZONE NULL,
    date_error TIMESTAMP WITHOUT TIME ZONE NULL
);

CREATE UNIQUE INDEX xbus_emission_queue_envelope_id_idx
  ON xbus_emission_queue (envelope_id);

CREATE INDEX xbus_emission_queue_status_idx
  ON xbus_emission_queue (status);