-- Modify existing indexes to include subnet_id values of 0, so index is also used
-- for global reservations.
-DROP INDEX key_dhcp4_identifier_subnet_id;
+DROP INDEX IF EXISTS key_dhcp4_identifier_subnet_id;
CREATE UNIQUE INDEX key_dhcp4_identifier_subnet_id ON hosts
(dhcp_identifier ASC, dhcp_identifier_type ASC, dhcp4_subnet_id ASC)
WHERE (dhcp4_subnet_id IS NOT NULL);
-DROP INDEX key_dhcp6_identifier_subnet_id;
+DROP INDEX IF EXISTS key_dhcp6_identifier_subnet_id;
CREATE UNIQUE INDEX key_dhcp6_identifier_subnet_id ON hosts
(dhcp_identifier ASC, dhcp_identifier_type ASC, dhcp6_subnet_id ASC)
WHERE (dhcp6_subnet_id IS NOT NULL);