sql: use last_update_time from database (#76003)

wcs/formdata.py

@@ -1287,6 +1287,8 @@ class FormData(StorableObject):
             return self.receipt_time
 
     def set_last_update_time(self, value):
+        if isinstance(value, datetime.datetime):
+            value = value.timetuple()
         self._last_update_time = value
 
     last_update_time = property(get_last_update_time, set_last_update_time)

wcs/sql.py

@@ -2667,6 +2667,10 @@ class SqlDataMixin(SqlMixin):
             'workflow_merged_roles_dict': self.workflow_merged_roles_dict,
             'statistics_data': self.statistics_data or {},
         }
+        if self._evolution is not None and hasattr(self, '_last_update_time'):
+            # if evolution was loaded it may have been been modified, and last update time
+            # should then be refreshed.
+            delattr(self, '_last_update_time')
         if self.last_update_time:
             sql_dict['last_update_time'] = datetime.datetime.fromtimestamp(time.mktime(self.last_update_time))
         else:
@@ -2901,7 +2905,6 @@ class SqlDataMixin(SqlMixin):
             for field in extra_fields:
                 coldata, i = cls._col2obdata(row, i, field)
                 o.data.update(coldata)
-        del o._last_update_time
         return o
 
     @classmethod