[Backfill] Fix potential multi-commit of the same shard into combined table after backfill resume

[george-zubrienko]

Fixes #473

[github-code-quality]

Code Coverage Overview

Languages: Java

Java / code-coverage/jacoco

The overall coverage in the sql-fix branch is 74%. Coverage data for the main branch is not yet available.

Show a code coverage summary of the most covered files.

File	main	sql-fix 7a4ba20	+/-
services/iceber...logWriter.scala	—	97%	—
services/synaps...xtensions.scala	—	96%	—
models/cdm/CdmParser.scala	—	88%	—
services/mssql/...yProvider.scala	—	88%	—
services/iceber...onScanner.scala	—	86%	—
services/iceber...nversions.scala	—	84%	—
services/stream...undShaper.scala	—	82%	—
services/mssql/...ingSource.scala	—	81%	—
services/synaps...ingSource.scala	—	71%	—
utils/SqlUtils.scala	—	54%	—

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_{Updated July 13, 2026 13:09 UTC
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[s-vitaliy]

Added a comment with question. The new code coverage action sucks 🙂