Add id to searchmeter_recent table

[takotakot]

No description provided.

[bennettmcelwee]

Thanks for your contributions. What is the purpose of adding the ID to this table?

[takotakot]

I'm using MariaDB Galera Cluster for DB clustering. One of the limitations is about primary key:

All tables should have a primary key (multi-column primary keys are supported). DELETE operations are unsupported on tables without a primary key. Also, rows in tables without a primary key may appear in a different order on different nodes.

as described in Known Limitations.

If we add primary key (ID), throughput may decrease a little. But there is a (possibly old) problem that a table without a primary key may cause delay in replication [Delayed row-based replication with large tables lacking a primary key][without primary key 1][without primary key 2], too.

That's why I added the ID to this table.
Thanks.