T13: produksi web dengan gunicorn + WAL (gunicorn.conf.py, DASH_WORKERS, V12)

get_voters.py

@@ -97,10 +97,15 @@ def normalize(row):
 
 
 def persist(rows):
-    """V7: ganti snapshot — DROP+INSERT tiap skan, ⊥ history/append."""
+    """V7: ganti snapshot — DROP+INSERT tiap skan, ⊥ history/append.
+
+    WAL: journal_mode=WAL → pembaca (dashboard multi-worker) tak terblokir
+    saat DROP+INSERT harian. Mode ini persisten setelah diset.
+    """
     scanned_at = datetime.now().isoformat(timespec='seconds')
     conn = sqlite3.connect(DB_PATH)
     try:
+        conn.execute('PRAGMA journal_mode=WAL')
         conn.execute('DROP TABLE IF EXISTS voters')  # snapshot bersih
         conn.execute(
             'CREATE TABLE voters ('  # I.db