Honour the CCDB time machine for the mu(bc) distribution - #15653
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The mu(bc) lookup in CollisionContextTool uses its own CCDBManagerInstance, which -- unlike BasicCCDBManager -- never picks up the time-machine constraint from ALICEO2_CCDB_CONDITION_NOT_AFTER. FT0/Calib/EventsPerBc was therefore resolved against the present even when a time machine was requested, quietly switching the sampler and changing the collision context at an unchanged seed. Bunch filling and mean vertex, which go through BasicCCDBManager, were pinned correctly. Now carry the constraint over explicitly. See O2-7093.
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shahor02
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Jul 31, 2026
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The mu(bc) lookup in CollisionContextTool uses its own CCDBManagerInstance, which -- unlike BasicCCDBManager -- never picks up the time-machine constraint from ALICEO2_CCDB_CONDITION_NOT_AFTER. FT0/Calib/EventsPerBc was therefore resolved against the present even when a time machine was requested, quietly switching the sampler and changing the collision context at an unchanged seed. Bunch filling and mean vertex, which go through BasicCCDBManager, were pinned correctly.
Now carry the constraint over explicitly. See O2-7093.