-- Database: ml
-- Tabella jobs: ciclo di vita di un lavoro asincrono (training oggi, domani altro).
-- L'api-service espone /jobs /queue /pageconnections per coordinare accessi e coda.

CREATE TABLE IF NOT EXISTS jobs (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    type        TEXT NOT NULL,                 -- 'train' | 'test' | ...
    status      TEXT NOT NULL DEFAULT 'queued',-- queued|running|succeeded|failed|cancelled
    payload     JSONB NOT NULL DEFAULT '{}'::JSONB,
    result      JSONB,
    error       TEXT,
    created_by  TEXT NOT NULL,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    started_at  TIMESTAMPTZ,
    finished_at TIMESTAMPTZ,
    CONSTRAINT jobs_status_ok CHECK (status IN ('queued','running','succeeded','failed','cancelled'))
);
CREATE INDEX IF NOT EXISTS idx_jobs_status     ON jobs(status);
CREATE INDEX IF NOT EXISTS idx_jobs_type       ON jobs(type);
CREATE INDEX IF NOT EXISTS idx_jobs_created_by ON jobs(created_by);
CREATE INDEX IF NOT EXISTS idx_jobs_created_at ON jobs(created_at DESC);

DROP TRIGGER IF EXISTS trg_jobs_updated_at ON jobs;
CREATE TRIGGER trg_jobs_updated_at
    BEFORE UPDATE ON jobs
    FOR EACH ROW EXECUTE FUNCTION set_updated_at();