public async Task RemoveModeratorFromSpace(string username, string spaceName, User user)
{
User oldMod = await GetUserOrThrow(username);
Space space = await GetSpaceOrThrow(spaceName);
Role?modRole = await roleRepo.FindModeratorRole(user, spaceName);
if (modRole == null)
{
throw new InvalidOperationException($"User {oldMod.Username} was not a mod of space {space}.");
}
await roleRepo.Delete(modRole);
await eventBus.Dispatch(new ModeratorRemovedFromSpaceEvent(space, user));
}