CREATE TABLE IF NOT EXISTS app.reports (
    report_id BIGSERIAL PRIMARY KEY,
    report_type TEXT NOT NULL CHECK (report_type IN ('monthly', 'area_special', 'neighborhood_memo')),
    title TEXT NOT NULL,
    target_month TEXT CHECK (target_month IS NULL OR target_month ~ '^[0-9]{4}-[0-9]{2}$'),
    area_id TEXT REFERENCES silver.areas(area_id),
    neighborhood_id TEXT REFERENCES silver.neighborhoods(neighborhood_id),
    summary TEXT NOT NULL DEFAULT '',
    content_markdown TEXT NOT NULL,
    linked_metrics JSONB NOT NULL DEFAULT '{}'::jsonb,
    status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'published', 'archived')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    CHECK (char_length(title) > 0),
    CHECK (char_length(content_markdown) > 0)
);

CREATE INDEX IF NOT EXISTS idx_reports_type_month
    ON app.reports(report_type, target_month, report_id DESC);

CREATE INDEX IF NOT EXISTS idx_reports_area
    ON app.reports(area_id, report_id DESC);

CREATE INDEX IF NOT EXISTS idx_reports_neighborhood
    ON app.reports(neighborhood_id, report_id DESC);

CREATE INDEX IF NOT EXISTS idx_reports_linked_metrics
    ON app.reports USING GIN (linked_metrics);