Add metadata for batch 19

batch_19_metadata.json

@@ -0,0 +1,7 @@
+{
+  "upload_time": "2025-06-23T07:57:42.746381",
+  "total_trees": 212,
+  "new_trees": 9,
+  "batch_number": 19,
+  "upload_interval": 30
+}