Fix stale test branch clean up

Author: CarsonF

test/utility/edgedb-setup.ts

@@ -27,21 +27,18 @@ export const ephemeralEdgeDB = async () => {
 async function dropStale(db: Client) {
   const branches = await db.query<string>('select sys::Database.name');
 
-  const stale = branches.flatMap((name) => {
+  const stale = branches.filter((name) => {
     if (!name.startsWith('test_')) {
-      return [];
+      return false;
     }
     const ts = Number(name.slice(5));
     if (isNaN(ts)) {
-      return [];
+      return false;
     }
     const createdAt = DateTime.fromMillis(ts);
-    return createdAt.diffNow().as('hours') > 4 ? name : [];
-  });
-  if (stale.length === 0) {
-    return;
-  }
-  await db.execute('drop branch array_unpack(<array<string>>$branches)', {
-    branches: stale,
+    // more than 1 hour old
+    return createdAt.diffNow().as('hours') < -1;
   });
+
+  await Promise.all(stale.map((branch) => db.execute(`drop branch ${branch}`)));
 }