buzz/migrations/0018_push_match_queue.sql

-- Durable event-to-push matching follower. The trigger runs in the event insert
-- transaction, so every accepted persistent event has a crash-safe match job and
-- rejected/rolled-back events never do. Processing is idempotent through the
-- push_wake_outbox endpoint/event unique key.
CREATE TABLE push_match_queue (
    community_id UUID NOT NULL REFERENCES communities(id),
    event_id BYTEA NOT NULL CHECK (length(event_id) = 32),
    state TEXT NOT NULL DEFAULT 'pending' CHECK (state IN ('pending','matching')),
    attempts INTEGER NOT NULL DEFAULT 0 CHECK (attempts >= 0),
    next_attempt_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    lease_until TIMESTAMPTZ,
    claim_id UUID,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (community_id, event_id)
);
CREATE INDEX push_match_queue_due
    ON push_match_queue (next_attempt_at, created_at) WHERE state = 'pending';
CREATE INDEX push_match_queue_recovery
    ON push_match_queue (lease_until) WHERE state = 'matching';

CREATE FUNCTION enqueue_push_match_job() RETURNS trigger
LANGUAGE plpgsql AS $$
BEGIN
    -- Keep this allowlist identical to the relay's validated NIP-PL descriptor.
    -- Centralizing it on the events table covers every durable producer,
    -- including internal paths that bypass live dispatch.
    IF NEW.kind IN (7, 9, 1059, 40007, 46010) THEN
        INSERT INTO push_match_queue (community_id, event_id)
        VALUES (NEW.community_id, NEW.id)
        ON CONFLICT DO NOTHING;
    END IF;
    RETURN NEW;
END
$$;

CREATE TRIGGER events_enqueue_push_match
AFTER INSERT ON events
FOR EACH ROW EXECUTE FUNCTION enqueue_push_match_job();