feat(playground): add Chat UI and comparison testing#74

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pescn merged 9 commits intomainfrom

feat/playground

Feb 7, 2026

Commits on Feb 7, 2026

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feat(playground): add database schema, migrations, and queries

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feat(playground): add backend admin API endpoints

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feat(playground): add frontend chat and comparison testing UI

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fix(playground): address code review feedback

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fix(playground): address follow-up code review feedback

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fix(playground): add FK cascade/set-null actions and atomic test run creation

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fix(playground): add message insert null check, TTFT translation, and outer catch

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fix(playground): validate testCaseId, fail transaction on insert error, fix running PUT scope

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