create table if not exists alert_feedback (
    id bigserial primary key,
    subject_type text not null,
    subject_id bigint not null,
    alert_id bigint references decision_alerts(id) on delete cascade,
    visual_review_id bigint references visual_reviews(id) on delete cascade,
    label text not null,
    note text not null default '',
    created_by text not null default 'local_operator',
    created_ts timestamptz not null default now(),
    payload jsonb not null default '{}'::jsonb,
    constraint chk_alert_feedback_subject check (
        (
            subject_type = 'alert'
            and alert_id is not null
            and visual_review_id is null
            and subject_id = alert_id
        )
        or (
            subject_type = 'visual_review'
            and visual_review_id is not null
            and alert_id is null
            and subject_id = visual_review_id
        )
    )
);

create index if not exists idx_alert_feedback_alert_created_desc
on alert_feedback (alert_id, created_ts desc, id desc);

create index if not exists idx_alert_feedback_visual_review_created_desc
on alert_feedback (visual_review_id, created_ts desc, id desc);