dhcpdb_create.pgsql erroneously creates dhcp4_server_modification_ts index on dhcp6_server table

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Describe the bug

dhcpdb_create.pgsql erroneously creates the dhcp4_server_modification_ts index on the dhcp6_server table

To Reproduce Steps to reproduce the behavior:

1. Initialize a PostgreSQL database using dhcpdb_create.pgsql
2. Inspect the dhcp4_server_modification_ts index
3. See that it is associated with the dhcp6_server table

Expected behavior A clear and concise description of what you expected to happen:

The dhcp4_server_modification_ts index should be associated with the dhcp4_server table.

Environment:

• Kea version: 2.2.0
• OS: FreeBSD 13.2-RELEASE amd64
• Compiled with pgsql backend
• Loaded hooks: pgsql_cb

Additional Information

kea=> \di dhcp4_server_modification_ts
                          List of relations
 Schema |             Name             | Type  | Owner |    Table
--------+------------------------------+-------+-------+--------------
 public | dhcp4_server_modification_ts | index | kea   | dhcp6_server
(1 row)

This appears to have been introduced as a copy/paste error in version 7.0 of the schema. I could identify no correspond bug in the MySQL schema.

Contacting you

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