feat: add area score model runs

apps/api/migrations/202606240003_model_runs.sql

@@ -0,0 +1,20 @@
+CREATE TABLE IF NOT EXISTS gold.model_runs (
+    model_run_id BIGSERIAL PRIMARY KEY,
+    model_name TEXT NOT NULL,
+    model_version TEXT NOT NULL,
+    target_month TEXT NOT NULL CHECK (target_month ~ '^[0-9]{4}-[0-9]{2}$'),
+    status TEXT NOT NULL,
+    parameters JSONB NOT NULL DEFAULT '{}'::jsonb,
+    started_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    finished_at TIMESTAMPTZ,
+    row_count INTEGER,
+    error_message TEXT
+);
+
+ALTER TABLE gold.area_scores
+    ADD COLUMN IF NOT EXISTS model_run_id BIGINT REFERENCES gold.model_runs(model_run_id);
+
+CREATE INDEX IF NOT EXISTS idx_model_runs_target
+    ON gold.model_runs(model_name, target_month, started_at DESC);
+CREATE INDEX IF NOT EXISTS idx_area_scores_model_run
+    ON gold.area_scores(model_run_id);