Prevent duplicate reification of edges in addFact#586
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When adding an edge (object property assertion), check whether an axiom with the same subject, property, and object already exists. If so, merge the new annotations (evidence) into the existing axiom rather than creating a second reified axiom. The check-then-act is synchronized to prevent a race condition between concurrent requests. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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When adding an edge (object property assertion), check whether an axiom with the same subject, property, and object already exists. If so, merge the new annotations (evidence) into the existing axiom rather than creating a second reified axiom. The check-then-act is synchronized to prevent a race condition between concurrent requests.