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DM-54923: Allow AP association to fall back to second-best match#358

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isullivan wants to merge 3 commits into
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tickets/DM-54923
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DM-54923: Allow AP association to fall back to second-best match#358
isullivan wants to merge 3 commits into
mainfrom
tickets/DM-54923

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isullivan added 3 commits May 12, 2026 16:49
…s are present

The associator previously ranked candidate matches by chord distance only
and accepted any pair within a fixed 1" cap, ignoring per-source and
per-object positional uncertainties entirely.
When the uncertainty columns are missing or contain no usable values, the
score reverts to the kd-tree chord distance (the previous behavior).
The previous matcher considered only each DIASource's single nearest
DIAObject. When two sources competed for the same object, the loser
would be unassociated and triggered a new DIAObject even if a viable
second-best candidate was nearby.
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