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I'll conduct a comprehensive final review to ensure the refactoring is complete and consistent across the codebase.

@steven-tey Excellent work on this refactoring! After conducting a comprehensive final review, I can confirm that the changes are well-implemented and ready for merge. Here's my assessment:

✅ Strengths Identified:

1. Complete Consistency: The refactoring is consistently applied across all affected files:

   • API routes properly prioritize customerExternalId over deprecated fields
   • Schemas correctly define the new field with proper validation
   • Tests comprehensively cover both new and legacy field usage

2. Robust Backward Compatibility: The implementation gracefully handles the transition:

   • Deprecated fields are clearly marked in schemas with OpenAPI metadata
   • Logic properly falls back: customerExternalId → externalId → customerId
   • All legacy fields continue to work without breaking existing integrations

3. Comprehensive Test Coverage:

   • Primary tests use the new customerExternalId field
   • Dedicated backward compatibility tests for both externalId and customerId
   • Error cases and edge scenarios are properly covered

4. Clear Migration Path: The field naming is indeed more verbose and self-descriptive, improving developer experience.

🎯 Key Validation Points:

• ✅ Schema definitions align with route implementations
• ✅ Deprecation warnings are properly configured
• ✅ Test coverage includes all supported field variations
• ✅ No breaking changes for existing API consumers
• ✅ Field priority logic is correctly implemented

The refactoring successfully achieves the objective of making the field name more verbose while maintaining full backward compatibility. The implementation is production-ready and follows best practices for API evolution.

Recommendation: Merge with confidence! 🚀

🏁 Script executed:

#!/bin/bash
# First, let's examine the actual API route implementations to verify they match the test changes
echo "=== Checking lead tracking route implementation ==="
cat apps/web/app/(ee)/api/track/lead/route.ts

echo -e "\n=== Checking sale tracking route implementation ==="
cat apps/web/app/(ee)/api/track/sale/route.ts

Length of output: 341

🏁 Script executed:

#!/bin/bash
# Check the schema files to verify the field definitions
echo "=== Checking leads schema ==="
cat apps/web/lib/zod/schemas/leads.ts

echo -e "\n=== Checking sales schema ==="
cat apps/web/lib/zod/schemas/sales.ts

Length of output: 10581

🏁 Script executed:

#!/bin/bash
# Search for any remaining references to the old field names to ensure consistency
echo "=== Searching for any remaining 'externalId' references in relevant files ==="
rg "externalId" apps/web/app/\(ee\)/api/track/ -A 2 -B 2

echo -e "\n=== Searching for 'customerId' references in tracking routes ==="
rg "customerId" apps/web/app/\(ee\)/api/track/ -A 2 -B 2

Length of output: 10048

🏁 Script executed:

#!/bin/bash
# Check if there are any other files that might reference these fields that need updating
echo "=== Searching for 'customerExternalId' usage across the codebase ==="
rg "customerExternalId" --type ts -A 1

echo -e "\n=== Checking for any TypeScript interfaces that might need updating ==="
rg "externalId.*:" apps/web/lib/types.ts -A 2 -B 2 || echo "No externalId field definitions found in types.ts"

Length of output: 6572

🏁 Script executed:

#!/bin/bash
# Verify test files are comprehensive and cover all scenarios
echo "=== Checking lead test file structure ==="
grep -n "describe\|it\|test" apps/web/tests/tracks/track-lead.test.ts

echo -e "\n=== Checking sale test file structure ==="
grep -n "describe\|it\|test" apps/web/tests/tracks/track-sale.test.ts

Length of output: 2965