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https://github.com/ZoneMinder/zoneminder.git
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f7a3263c52
zmfilter and the web filter UI generated SQL like
to_days(E.StartDateTime) = to_days('2026-05-06 09:42:56')
which prevents MySQL from using the StartDateTime index, forcing a
full table scan. With many filter daemons against a large Events
table this saturates mysqld and makes the system unresponsive.
Rewrite the SQL generation in ZoneMinder::Filter (Perl) and
ZM\FilterTerm (PHP) so Date/StartDate/EndDate attrs emit range
expressions against the underlying datetime column:
E.StartDateTime >= '2026-05-06 00:00:00'
AND E.StartDateTime < '2026-05-07 00:00:00'
Covers =, !=, >, >=, <, <=, IS, IS NOT, IN, NOT IN, and the
CURDATE()/NOW() values (which use INTERVAL 1 DAY for the upper
bound). EXPLAIN now reports type=range on Events_StartDateTime_idx
where it previously reported type=ALL.
CurrentDate (the constant left-hand expression to_days(NOW()))
keeps its existing form since it does not touch the indexed column.
Add Perl and PHP unit tests under tests/perl/ and tests/php/
exercising the generated SQL across operators.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>