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Refactor TaskExecutor in backend/secuscan/executor.py to Reduce Complexity and Improve Maintainability #1155

Description

Overview

The TaskExecutor component located in backend/secuscan/executor.py currently has one of the highest complexity scores in the SecuScan codebase. Its current implementation appears to handle multiple responsibilities, making it difficult to maintain, test, and extend.

Problem

High-complexity code can lead to:
Reduced readability and maintainability
Increased difficulty in debugging and testing
Higher risk of introducing regressions during feature additions
Challenges for new contributors trying to understand the execution flow

Based on static analysis, TaskExecutor is the most complex component in the repository and could benefit from refactoring.

Proposed Improvements:
Break down large methods into smaller, focused functions.
Separate concerns such as:
Task scheduling
Task execution
Status/progress tracking
Error handling and retries
Improve code documentation and type annotations.
Add or update unit tests to cover extracted functionality.

Expected Benefits:
Improved code readability.
Better maintainability and extensibility.
Easier testing and debugging.
Reduced technical debt.
More contributor-friendly architecture.

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