feat: lake: use trace mtime for arts when possible#12799
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tydeu merged 3 commits intoleanprover:masterfrom Mar 5, 2026
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feat: lake: use trace mtime for arts when possible#12799tydeu merged 3 commits intoleanprover:masterfrom
tydeu merged 3 commits intoleanprover:masterfrom
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This PR changes Lake to use the modification times of traces (where available) for artifact modification times.
When artifacts are hard-linked from the cache, they retain the modification time of the artifact in the cache. Thus, the artifact modification time is an unreliable metric for determining whether an artifact is up-to-date relative to other artifacts in the presence of the cache. The trace file, however, is modified consistently when the artifacts are updated, making it the most reliable indicator of modification time.