ALTER TABLE computer_jobs ADD COLUMN IF NOT EXISTS run_id TEXT REFERENCES runs(id) ON DELETE SET NULL;

-- A local sequence belongs to one provisioned Computer generation.
CREATE TABLE computer_job_events (
    computer_id TEXT NOT NULL REFERENCES computers(id) ON DELETE CASCADE,
    generation INTEGER NOT NULL,
    provider_ref TEXT NOT NULL,
    local_id BIGINT NOT NULL,
    job_id TEXT NOT NULL,
    event TEXT NOT NULL,
    payload JSONB NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (computer_id, generation, provider_ref, local_id)
);
CREATE INDEX computer_job_events_retention ON computer_job_events(created_at);