changes of column import and add serialize table column fild show as per sheet

app/models/mh_ex_client_model.py

@@ -78,3 +78,6 @@ class ManholeExcavationClient(db.Model):
 
     def __repr__(self):
         return f"<HanholeExcavation {self.Location}>"
+
+    def serialize(self):
+        return {c.name: getattr(self, c.name) for c in self.__table__.columns}