[SQLtattoo]

Summary

• complete the Docker and GitHub Actions demo paths
• harden file access and budget calculation edge cases
• simplify transaction category aggregation while preserving the duplicate-detection exercise
• add focused calculator, file-handler, processor, and data-table tests
• enforce a consistent 80% coverage gate and align trainer/agent documentation with the completed walkthrough state
• add the repository refactor agent customization

Validation

• python main.py
• pytest -q
• 30 tests passed
• 85.63% coverage; 80% gate passed

Remaining intentional gaps

• O(n^2) duplicate detection remains for the performance-refactoring exercise
• transaction validation and malformed CSV handling remain teaching tasks
• feature-generation TODOs remain documented in INTENTIONAL_ISSUES.md

[SQLtattoo]

@copilot review the diff

[Copilot]

@copilot review the diff

Found one issue: both sort paths coerce falsey values to "" (data_table.py:157 and data_table.py:372). Sorting numeric values that include 0 or None alongside other numbers then compares strings and numbers and raises TypeError; process_table_data inherits this via sort_data. Please preserve numeric values and handle missing values separately.

[SQLtattoo]

demo PR