USE billing;

ALTER TABLE billing_mappings DROP FOREIGN KEY b_m_bilprofid_ref;
ALTER TABLE billing_mappings DROP KEY profileid_idx;

ALTER TABLE billing_mappings CHANGE billing_profile_id
  outbound_billing_profile_id int(11) unsigned;
ALTER TABLE billing_mappings ADD COLUMN 
  inbound_billing_profile_id int(11) unsigned
  AFTER outbound_billing_profile_id;

ALTER TABLE billing_mappings ADD KEY out_profileid_idx(outbound_billing_profile_id);
ALTER TABLE billing_mappings ADD KEY in_profileid_idx(inbound_billing_profile_id);
ALTER TABLE billing_mappings ADD CONSTRAINT b_m_out_bilprofid_ref
  FOREIGN KEY(outbound_billing_profile_id) REFERENCES billing_profiles(id) 
  ON UPDATE CASCADE;
ALTER TABLE billing_mappings ADD CONSTRAINT b_m_in_bilprofid_ref
  FOREIGN KEY(inbound_billing_profile_id) REFERENCES billing_profiles(id) 
  ON UPDATE CASCADE;