class AuditRouter:
    """Route the AuditEvent model to the 'audit' database; everything else to 'default'."""
    audit_app_label = "refs"
    audit_model_names = {"auditevent"}

    def db_for_read(self, model, **hints):
        if model._meta.app_label == self.audit_app_label and model._meta.model_name in self.audit_model_names:
            return "audit"
        return "default"

    def db_for_write(self, model, **hints):
        if model._meta.app_label == self.audit_app_label and model._meta.model_name in self.audit_model_names:
            return "audit"
        return "default"

    def allow_relation(self, obj1, obj2, **hints):
        return True

    def allow_migrate(self, db, app_label, model_name=None, **hints):
        if app_label == self.audit_app_label and model_name in self.audit_model_names:
            return db == "audit"
        return db == "default"