-- 002_dead_letter_v1.sql
-- 死信表：失败任务落点（框架壳，不含业务重放逻辑）
-- 禁止对现网 ytd_runtime 执行。

CREATE TABLE IF NOT EXISTS agent_dead_letter (
    id              UUID PRIMARY KEY,
    source          TEXT NOT NULL DEFAULT '',
    source_id       TEXT NOT NULL DEFAULT '',
    job_type        TEXT NOT NULL DEFAULT '',
    payload         JSONB NOT NULL DEFAULT '{}'::jsonb,
    error           TEXT NOT NULL DEFAULT '',
    attempts        INT NOT NULL DEFAULT 0,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    replayed_at     TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_agent_dead_letter_created
    ON agent_dead_letter (created_at DESC);

CREATE INDEX IF NOT EXISTS idx_agent_dead_letter_job_type
    ON agent_dead_letter (job_type, created_at DESC);

INSERT INTO schema_migrations (version, description)
VALUES ('002_dead_letter_v1', 'agent_dead_letter 死信表壳')
ON CONFLICT (version) DO NOTHING;