Server.php's ReadStats() query (SELECT ... WHERE ServerId=? ORDER BY
TimeStamp DESC LIMIT 1) had no supporting index, forcing a full table
scan on every page load that shows server stats. Add a composite
(ServerId, TimeStamp) index via zm_update-1.39.18.sql (idempotent,
checked against INFORMATION_SCHEMA.STATISTICS) and zm_create.sql.in
for fresh installs. Keep the existing TimeStamp-only index, since
zmstats.pl's prune DELETE filters by TimeStamp alone.
Also query ReadStats() with the server's actual Id() instead of
coercing Id() <= 1 to 0.
Bump version.txt and the redhat spec Version to 1.39.18.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q7jeoG8ptXRpXxif2JqkD7
06801955a8