Schedule: Add unit tests to services/supabase/coverages/get_coverages.py

[gitauto-ai]

Resolves #1972

Summary

Add comprehensive unit tests for services/supabase/coverages/get_coverages.py, exercising happy paths, error handling, and the previously uncovered conditional branch.

Test Patterns

• Returns expected coverage data for a valid query (happy path)
• Handles an empty result set by returning an empty list
• Exercises both sides of the uncovered conditional (issue reference: line 53 -> 66) to achieve high branch coverage
• Propagates/handles Supabase query errors (e.g., .execute() returning an error)
• Surfaces client exceptions (e.g., network/runtime exceptions from the Supabase client)
• Handles rows with missing or null optional fields gracefully
• Validates/guards against invalid input arguments (e.g., None/empty identifiers) and responds per function contract
• Ensures data normalization/typing (e.g., numbers/strings) is consistent across returned items

git fetch origin
git checkout gitauto/issue-1972-20251014-000102-Wrfw
git pull origin gitauto/issue-1972-20251014-000102-Wrfw