[dm/syncer]: Fix secondsBehindMaster spurious drop to 0 between DML batches#12581

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Commits on Apr 1, 2026

[dm/syncer]: Fix secondsBehindMaster spurious drop to 0 between DML batches

mengxian-li
and
claude
committed
[dm/syncer]: Add tests for secondsBehindMaster spurious-zero fix

mengxian-li
and
claude
committed