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MDL-74681 lib/dml: moodle_read_slave_trait: written table timestamping
Moved written table timestamping from query_start() to query_end(): We are adjusting table last written times at the end of transaction. That does not apply to immediate database writes that are not performed within transaction. This change is to set last written time after the query has finished for such writes, rather than before it started. That way long write operations cannot spill over the latency parameter.
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