fix: use BigInt arithmetic for nanosecond timestamp conversion

[okxint]

What

Three call sites compute nanosecond timestamps by multiplying Date.getTime() (a float) by 1_000_000 before converting to BigInt. Once the product exceeds Number.MAX_SAFE_INTEGER, IEEE 754 precision is lost silently.

The correct pattern already exists in the same file (convertDateToNanoseconds):

// before (precision loss)
BigInt(new Date().getTime() * 1_000_000)

// after (integer arithmetic)
BigInt(new Date().getTime()) * BigInt(1_000_000)

Changes

• eventRepository/common.server.ts: getNowInNanoseconds and calculateDurationFromStart
• eventRepository/index.server.ts: run-event startTime on the replay path
• runEngineHandlers.server.ts: retry-event startTime in recordEvent

All four sites now match the pattern in convertDateToNanoseconds.

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Reviewing files that changed from the base of the PR and between 8fcb035 and 3827f4d.

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📒 Files selected for processing (4)

• .server-changes/fix-otlp-nanosecond-bigint-precision.md
• apps/webapp/app/v3/eventRepository/common.server.ts
• apps/webapp/app/v3/eventRepository/index.server.ts
• apps/webapp/app/v3/runEngineHandlers.server.ts

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[github-actions]

Hi @okxint, thanks for your interest in contributing!

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🔍 Release note understates affected runs

Nanosecond products exceed Number.MAX_SAFE_INTEGER by April 1970, not 2255. Current runs already lose precision under the old conversion, so this note misstates the fix's scope.

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