now dv returns corrent timestamps

Author: kozachynskyi

opcua/server/history_sql.py

@@ -116,7 +116,7 @@ def read_node_history(self, node_id, start, end, nb_values):
 
                     # rebuild the data value object
                     dv = ua.DataValue(variant_from_binary(Buffer(row[6])))
-                    dv.SourceTimestamp = row[1]
+                    dv.ServerTimestamp = row[1]
                     dv.SourceTimestamp = row[2]
                     dv.StatusCode = ua.StatusCode(row[3])