Fix TaskInstance duration calculation with SQLite - #68142
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Why
In SQLite,
%salready includes the whole seconds, while%freturns seconds within the current minute including its integer portion. Combining them counts whole seconds twice and can produce incorrect or negative durations when thetimestamps cross a minute boundary.
Was generative AI tooling used to co-author this PR?
{pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.