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Add support for annotating individual spans with scores, labels, and comments. This enables reviewers to provide structured feedback on trace execution, supporting evaluation datasets, prompt iteration, and quality monitoring. Changes: - Add span_annotations table with type-discriminated value column - Implement CRUD datalayer with validation - Add 4 API endpoints (GET/POST/PATCH/DELETE) nested under traces - Create query and mutation hooks for React Query - Add annotation UI section to SpanDetailView with inline form - Support scores (numeric), labels (categorical), and comments (free text)
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Summary
Add support for annotating individual spans with structured human feedback (scores, labels, comments). This enables reviewers to provide quality signals on trace execution, supporting evaluation datasets, prompt iteration, and quality monitoring workflows.
Changes
span_annotationstable with discriminated type (score/label/comment) and JSONB valueTesting