Add MongoDB query utilities and update batch size for document insertion

db/schema_generator.py

@@ -335,7 +335,7 @@ def create_postgres_table_from_mongo(
 class MongoDocumentInserter:
     """Insert MongoDB documents into PostgreSQL tables with type conversion."""
 
-    def __init__(self, batch_size: int = 1000):
+    def __init__(self, batch_size: int = 10000):
         """
         Initialize the document inserter.