[PR] Fix flaky measure schema-merge timestamps [skywalking-banyandb]

["hanahmily (via GitHub)" <gi...@apache.org>]

hanahmily opened a new pull request, #1288:
URL: https://github.com/apache/skywalking-banyandb/pull/1288

   ### Fix flaky measure schema-merge test timestamps
   
   - [x] Add a test verification that the fix works.
   - [x] Explain briefly why the bug exists and how to fix it.
   
   The schema-merge test starts with a millisecond-aligned timestamp, but near midnight it divides the elapsed-since-midnight duration by two and four to keep both batches in the same segment. Duration division can introduce fractional milliseconds, causing BanyanDB to reject the generated writes with `invalid timestamp: time is not millisecond precision`.
   
   Normalize the final batch timestamps to millisecond precision after applying the calculated offsets. This preserves the intended ordering and segment placement while satisfying the write API contract.
   
   #### Validation
   
   ```text
   go test ./banyand/measure -run TestMeasure -ginkgo.focus='Measure schema with changed tag type after merge' -count=1
   ```
   
   - [ ] If this pull request closes/resolves/fixes an existing issue, replace the issue number. Fixes apache/skywalking#<issue number>.
   - [ ] Update the [`CHANGES` log](https://github.com/apache/skywalking-banyandb/blob/main/CHANGES.md).
   


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Re: [PR] Fix flaky schema-merge tests near midnight [skywalking-banyandb]

["hanahmily (via GitHub)" <gi...@apache.org>]

hanahmily merged PR #1288:
URL: https://github.com/apache/skywalking-banyandb/pull/1288


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