fix(ai): use UUID v7 for trace IDs#3902
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Prompt To Fix All With AIFix the following 1 code review issue. Work through them one at a time, proposing concise fixes.
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### Issue 1 of 1
packages/ai/tests/utils.test.ts:3
**Duplicated `UUIDV7_REGEX` constant across three test files**
The exact same regex is defined independently in `azure-openai.test.ts`, `captureAiGeneration.test.ts`, and `utils.test.ts`. This violates the OnceAndOnlyOnce principle — moving it to a shared test helper (e.g. `tests/helpers.ts`) would give a single authoritative definition to update if the format ever changes.
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Size Change: -159 B (0%) Total Size: 17 MB
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@PostHog/team-ai-observability was there a reason to use v4 instead of v7? |
carlos-marchal-ph
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Jun 19, 2026
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Looks good on our end, will be better for AI events since we order by trace ID
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Problem
Generated AI trace IDs in
@posthog/aistill used UUID v4, while other SDK-generated event/session IDs have moved to UUID v7 for time-ordered identifiers.Changes
uuidv7()from the existing@posthog/coredependency for default AI trace IDs.captureAiGeneration, and the Vercel AI SDK wrapper.@posthog/ai.Release info Sub-libraries affected
Libraries affected
Checklist
If releasing new changes
pnpm changesetto generate a changeset file🤖 Agent context
Autonomy: Human-driven (agent-assisted)
Implemented by a delegated worker agent using the local repository tools. The change keeps the migration scoped to generated
@posthog/aitrace IDs and reuses@posthog/core's existing UUID v7 helper rather than adding a new dependency.