PostgreSQL corrections for schema 7.0
dhcp4_subnet_idto INT for the initial creation. It is already altered to BIGINT on dhcpdb_create.pgsql:542 and upgrade_3.2_to_3.3.sh.in:44.
Other less important changes:
CREATE OR REPLACEeverywhere, just as it was recently modified in
INSERT INTO host_identifier_type VALUES (3, 'client-id');to upgrade script. Not related to changes made in #90 (closed) and #2166 (closed), but it is missing since 2016. I would prefer it in its intended upgrade script.
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