Alex Vandiver 902498ec4f zilencer: Update remoterealm indexes. ...

There is no reason to have an index on just `realm_id` or `remote_id`,
as those values mean nothing outside of the scope of a specific
`server_id`.  Remove those never-used single-column indexes from the
two tables that have them.

By contrast, the pair of `server_id` and `remote_id` is quite useful
and specific -- it is a unique pair, and every POST of statistics from
a remote host requires looking up the highest `remote_id` for a given
`server_id`, which (without this index) is otherwise a quite large
scan.

Add a unique constraint, which (in PostgreSQL) is implemented as a
unique index.

2023-09-14 09:30:16 -07:00

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