clean up db method files

custom_ui/api/db/estimates.py

@@ -0,0 +1,19 @@
+import frappe, json
+from custom_ui.db_utils import process_query_conditions, build_datatable_response, get_count_or_filters
+
+# ===============================================================================
+# ESTIMATES & INVOICES API METHODS
+# ===============================================================================
+
+@frappe.whitelist()
+def upsert_estimate(data):
+    """Create or update an estimate."""
+    # TODO: Implement estimate creation/update logic
+    pass
+
+
+@frappe.whitelist()
+def upsert_invoice(data):
+    """Create or update an invoice."""
+    # TODO: Implement invoice creation/update logic
+    pass