ALTER TABLE tx_reservation ADD tx_vhc_type_id INT DEFAULT NULL;
ALTER TABLE tx_reservation ADD CONSTRAINT FK_A52FD7B4E90FFCDF FOREIGN KEY (tx_vhc_type_id) REFERENCES tx_vhc_type (id) ON DELETE SET NULL;
CREATE INDEX IDX_A52FD7B4E90FFCDF ON tx_reservation (tx_vhc_type_id);
