feat: add report center

apps/api/migrations/202606240007_reports.sql

@@ -0,0 +1,28 @@
+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);