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Jordi Enric
881c124301
## Problem The API Gateway report initializes its request range with the Logs Explorer helper, which leaves `iso_timestamp_end` empty. When an OTEL chart returns sparse microsecond timestamps, the time series filler can interpret them as milliseconds while deriving the end of the range and attempt an unbounded fill, freezing or crashing the browser tab. ## Fix Initialize the report with its date range helper so both request bounds are present. Normalize microsecond timestamps before deriving fill bounds, including the single point case. Add regression tests for sparse OTEL data with both empty and explicit end dates. ## How to test - Open Observability → API Gateway on a project with requests spanning two hourly buckets. The page should render without a tab crash, and the analytics requests should include a nonempty `iso_timestamp_end`. - Run `pnpm --filter studio exec vitest run tests/features/logs/Logs.utils.test.ts` and confirm the microsecond timestamp cases pass. - Run the Studio typecheck and lint checks. The Vitest, typecheck, and lint commands could not run in this worktree because Studio dependencies are not installed. The source diff passed `git diff --check` and received a focused code review.