refactor: enhance manual chunking in Vite config for better code splitting

src/services/storage-revision-repo.ts

@@ -0,0 +1,31 @@
+export async function getRevisionDate(db: D1Database, userId: string): Promise<string> {
+  const row = await db
+    .prepare('SELECT revision_date FROM user_revisions WHERE user_id = ?')
+    .bind(userId)
+    .first<{ revision_date: string }>();
+
+  if (row?.revision_date) return row.revision_date;
+
+  const date = new Date().toISOString();
+  await db
+    .prepare(
+      'INSERT INTO user_revisions(user_id, revision_date) VALUES(?, ?) ' +
+        'ON CONFLICT(user_id) DO NOTHING'
+    )
+    .bind(userId, date)
+    .run();
+
+  return date;
+}
+
+export async function updateRevisionDate(db: D1Database, userId: string): Promise<string> {
+  const date = new Date().toISOString();
+  await db
+    .prepare(
+      'INSERT INTO user_revisions(user_id, revision_date) VALUES(?, ?) ' +
+        'ON CONFLICT(user_id) DO UPDATE SET revision_date = excluded.revision_date'
+    )
+    .bind(userId, date)
+    .run();
+  return date;
+}