CREATE TABLE IF NOT EXISTS mail_index_jobs (
    id           BIGSERIAL PRIMARY KEY,
    job_type     TEXT NOT NULL CHECK (job_type IN ('index', 'delete')),
    tenant_slug  TEXT NOT NULL,
    message_id   TEXT NOT NULL,
    payload      JSONB NOT NULL DEFAULT '{}'::jsonb,
    status       TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'processing', 'succeeded', 'failed')),
    attempts     INT NOT NULL DEFAULT 0,
    max_attempts INT NOT NULL DEFAULT 5,
    available_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    locked_at    TIMESTAMPTZ,
    locked_by    TEXT,
    last_error   TEXT,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at   TIMESTAMPTZ NOT NULL DEFAULT now()
)