Download Raw Seismic Data Without Availability Confirmation

[tealefristoe]

This PR is a quick fix to accommodate the earthscope availability service being pulled without warning.

• When the availability check returns 410, we just assume all of the time range is available.
• We now report days with 0 bytes as empty days. Previously, the availability service would have told us a day like that was not available and we wouldn't have even tried downloading it.

[cypress]

collaborative-learning    Run #19562

Run Properties:   Passed #19562  •  673b9fe467: Emit progress for empty days.

Project	collaborative-learning
Branch Review	raw-data-direct-download
Run status	Passed #19562
Run duration	03m 07s
Commit	673b9fe467: Emit progress for empty days.
Committer	Teale Fristoe
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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	4
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[Copilot]

Pull request overview

This PR updates the seismic download pipeline to remain functional even when the EarthScope availability endpoint is retired/unreachable, by falling back to “assume full range available” behavior and by treating 0-byte waveform responses as empty days rather than cached data.

Changes:

• Treats 0-byte fetchRaw() responses as dayEmpty and avoids caching them.
• Makes fetchAvailability() resilient to proxy failures (e.g., HTTP 410 or network errors) by falling back to the full requested range (while still propagating aborts).
• Adds tests covering the new fallback and 0-byte-day behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
shared/seismic/seismic-downloader.ts	Skips caching 0-byte day chunks and emits dayEmpty for them.
shared/seismic/seismic-downloader.test.ts	Adds coverage ensuring 0-byte fetches emit dayEmpty and don’t write to cache.
shared/seismic/earthscope-client.ts	Wraps availability fetch/parse in a try/catch and falls back to full-range on failures (except abort).
shared/seismic/earthscope-client.test.ts	Adds tests for 410/network fallback and abort propagation.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.41%. Comparing base (4fc50e8) to head (673b9fe).

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HEAD has 35 uploads less than BASE

Flag	BASE (4fc50e8)	HEAD (673b9fe)
cypress-regression	15	0
cypress	20	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2934       +/-   ##
===========================================
- Coverage   85.86%   69.41%   -16.46%     
===========================================
  Files         957      952        -5     
  Lines       54527    54513       -14     
  Branches    14357    14357               
===========================================
- Hits        46822    37840     -8982     
- Misses       7687    16638     +8951     
- Partials       18       35       +17     

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cypress-smoke	41.64% <0.00%> (+0.08%)	⬆️
jest	55.85% <100.00%> (+0.01%)	⬆️

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[scytacki]

Looks good.