'Finds matching EventUser objects from a list of tag values.
Return a dictionary of {tag_value: event_user}.'

@classmethod
def for_tags(cls, project_id, values):

    hashes = [md5_text(v.split(':', 1)[(-1)]).hexdigest() for v in values]
    return {e.tag_value: e for e in cls.objects.filter(project=project_id, hash__in=hashes)}
