perf: handleChildrenEventTypes createManyAndReturn

[ThyMinimalDev]

What does this PR do?

Optimized child event type creation by using createManyAndReturn in handleChildrenEventTypes. This removes a follow-up fetch and reduces transaction time.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• N/A I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

---

Summary by cubic

Optimized child event type creation by using createManyAndReturn in handleChildrenEventTypes. This removes a follow-up fetch and reduces transaction time.

• Performance
  • Return created events directly from createManyAndReturn.
  • Eliminates the extra findMany used to map id/userId.
  • Preserves skipDuplicates behavior.

^{Written for commit 6f837d8. Summary will update automatically on new commits.}

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Project	Deployment	Preview	Comments	Updated (UTC)
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[cubic-dev-ai]

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