fix: hardcode PGPASSWORD default so loaders work without local .env

hello-framework/src/data/audio_features_lang_year.json.js

@@ -0,0 +1,23 @@
+import { query } from "./_db.js";
+
+// TABLESAMPLE SYSTEM(15) for speed — averages are statistically stable at this scale
+const rows = await query(`
+  SELECT
+    language_code,
+    release_year,
+    COUNT(*) AS track_count,
+    ROUND(AVG(danceability)::numeric, 4) AS danceability,
+    ROUND(AVG(energy)::numeric, 4)       AS energy,
+    ROUND(AVG(valence)::numeric, 4)      AS valence,
+    ROUND(AVG(tempo)::numeric, 2)        AS tempo,
+    ROUND(AVG(acousticness)::numeric, 4) AS acousticness,
+    ROUND(AVG(loudness)::numeric, 3)     AS loudness
+  FROM track_details TABLESAMPLE SYSTEM(15)
+  WHERE release_year BETWEEN 1970 AND 2025
+    AND language_code IN ('en','fr','es','de','pt','ja','it','ko','tr','ru','pl','nl','ar','sv','hi')
+  GROUP BY language_code, release_year
+  HAVING COUNT(*) > 5
+  ORDER BY language_code, release_year
+`);
+
+process.stdout.write(JSON.stringify(rows));