self.conn.close()
 
     def rewrite_relations(self, table_name: str, key: str, target: int | str,
-                          rows: list[list[Any]]) -> None:
-        """Rewrite relations in table_name to target, with rows values."""
+                          rows: list[list[Any]], key_index: int = 0) -> None:
+        # pylint: disable=too-many-arguments
+        """Rewrite relations in table_name to target, with rows values.
+
+        Note that single rows are expected without the column and value
+        identified by key and target, which are inserted inside the function
+        at key_index.
+        """
         self.delete_where(table_name, key, target)
         for row in rows:
-            values = tuple([target] + row)
+            values = tuple(row[:key_index] + [target] + row[key_index:])
             q_marks = self.__class__.q_marks_from_values(values)
             self.exec(f'INSERT INTO {table_name} VALUES {q_marks}', values)
 
     table_name = ''
     to_save: list[str] = []
     to_save_versioned: list[str] = []
-    to_save_relations: list[tuple[str, str, str]] = []
+    to_save_relations: list[tuple[str, str, str, int]] = []
     id_: None | BaseModelId
     cache_: dict[BaseModelId, Self]
     to_search: list[str] = []
         self.cache()
         for attr_name in self.to_save_versioned:
             getattr(self, attr_name).save(db_conn)
-        for table, column, attr_name in self.to_save_relations:
+        for table, column, attr_name, key_index in self.to_save_relations:
             assert isinstance(self.id_, (int, str))
             db_conn.rewrite_relations(table, column, self.id_,
                                       [[i.id_] for i
-                                       in getattr(self, attr_name)])
+                                       in getattr(self, attr_name)], key_index)
 
     def remove(self, db_conn: DatabaseConnection) -> None:
         """Remove from DB and cache, including dependencies."""
             raise HandledException('cannot remove unsaved item')
         for attr_name in self.to_save_versioned:
             getattr(self, attr_name).remove(db_conn)
-        for table, column, attr_name in self.to_save_relations:
+        for table, column, attr_name, _ in self.to_save_relations:
             db_conn.delete_where(table, column, self.id_)
         self.uncache()
         db_conn.delete_where(self.table_name, 'id', self.id_)
 
     table_name = 'processes'
     to_save = ['calendarize']
     to_save_versioned = ['title', 'description', 'effort']
-    to_save_relations = [('process_conditions', 'process', 'conditions'),
-                         ('process_blockers', 'process', 'blockers'),
-                         ('process_enables', 'process', 'enables'),
-                         ('process_disables', 'process', 'disables')]
+    to_save_relations = [('process_conditions', 'process', 'conditions', 0),
+                         ('process_blockers', 'process', 'blockers', 0),
+                         ('process_enables', 'process', 'enables', 0),
+                         ('process_disables', 'process', 'disables', 0)]
     to_search = ['title.newest', 'description.newest']
 
     def __init__(self, id_: int | None, calendarize: bool = False) -> None:
 
     table_name = 'todos'
     to_save = ['process_id', 'is_done', 'date', 'comment', 'effort',
                'calendarize']
-    to_save_relations = [('todo_conditions', 'todo', 'conditions'),
-                         ('todo_blockers', 'todo', 'blockers'),
-                         ('todo_enables', 'todo', 'enables'),
-                         ('todo_disables', 'todo', 'disables'),
-                         ('todo_children', 'parent', 'children'),
-                         ('todo_children', 'child', 'parents')]
+    to_save_relations = [('todo_conditions', 'todo', 'conditions', 0),
+                         ('todo_blockers', 'todo', 'blockers', 0),
+                         ('todo_enables', 'todo', 'enables', 0),
+                         ('todo_disables', 'todo', 'disables', 0),
+                         ('todo_children', 'parent', 'children', 0),
+                         ('todo_children', 'child', 'parents', 1)]
     to_search = ['comment']
 
     # pylint: disable=too-many-arguments