Can't delete project containing links with Postgres

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\core\entities\storage\root_dao.py", line 118, in remove_entity
    self.session.commit()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 1423, in commit
    self._transaction.commit(_to_root=self.future)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 829, in commit
    self._prepare_impl()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 808, in _prepare_impl
    self.session.flush()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 3255, in flush
    self._flush(objects)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 3395, in _flush
    transaction.rollback(_capture_exception=True)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\util\langhelpers.py", line 72, in __exit__
    with_traceback=exc_tb,
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\util\compat.py", line 211, in raise_
    raise exception
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 3355, in _flush
    flush_context.execute()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 450, in execute
    n.execute_aggregate(self, set_)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 774, in execute_aggregate
    mapper, [s for s in states if uow.states[s][0]], uow
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\persistence.py", line 345, in delete_obj
    delete,
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\persistence.py", line 1441, in _emit_delete_statements
    statement, del_objects, execution_options=execution_options
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 1521, in _execute_20
    return meth(self, args_10style, kwargs_10style, execution_options)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\sql\elements.py", line 314, in _execute_on_connection
    self, multiparams, params, execution_options
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 1400, in _execute_clauseelement
    cache_hit=cache_hit,
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 1750, in _execute_context
    e, statement, parameters, cursor, context
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 1931, in _handle_dbapi_exception
    sqlalchemy_exception, with_traceback=exc_info[2], from_=e
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\util\compat.py", line 211, in raise_
    raise exception
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 1707, in _execute_context
    cursor, statement, parameters, context
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\default.py", line 716, in do_execute
    cursor.execute(statement, parameters)
sqlalchemy.exc.IntegrityError: (psycopg2.errors.ForeignKeyViolation) update or delete on table "HasTraitsIndex" violates foreign key constraint "RegionMappingIndex_fk_surface_gid_fkey" on table "RegionMappingIndex"
DETAIL:  Key (gid)=(10467c4fd4874186afa6d9b1fd8383d8) is still referenced from table "RegionMappingIndex".

[SQL: DELETE FROM "HasTraitsIndex" WHERE "HasTraitsIndex".id = %(id)s]
[parameters: {'id': 2}]
(Background on this error at: http://sqlalche.me/e/14/gkpj)
2021-05-21 16:23:27,436 - ERROR - tvb.interface.web.controllers.decorators - An unexpected exception appeared
Traceback (most recent call last):
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\decorators.py", line 153, in deco
    return func(*a, **b)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\decorators.py", line 81, in deco
    template_dict = func(*a, **b)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\decorators.py", line 200, in deco
    return func(*a, **b)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\decorators.py", line 272, in deco
    return func(*a, **b)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\project\project_controller.py", line 160, in editone
    self._remove_project(project_id)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\interfaces\web\controllers\project\project_controller.py", line 141, in _remove_project
    self.project_service.remove_project(project_id)
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\core\entities\storage\session_maker.py", line 354, in dec
    session_maker.close_transaction()
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\core\entities\storage\session_maker.py", line 326, in close_transaction
    self.handled_sessions[current_thread].close_transaction()
  File "c:\users\robert.vincze\documents\tvb-root\framework_tvb\tvb\core\entities\storage\session_maker.py", line 239, in close_transaction
    top_transaction_session.commit()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 1423, in commit
    self._transaction.commit(_to_root=self.future)
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\orm\session.py", line 836, in commit
    trans.commit()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 2266, in commit
    self._do_commit()
  File "c:\users\robert.vincze\anaconda3\envs\storage-tvb\lib\site-packages\sqlalchemy\engine\base.py", line 2459, in _do_commit
    raise exc.InvalidRequestError("This transaction is inactive")
sqlalchemy.exc.InvalidRequestError: This transaction is inactive