Code Review: FRE-327 - Checkpoint & Resume

Verdict: APPROVED with suggestions

Reviewed all 4 files in src/checkpoint/:

__init__.py (13 lines)
checkpoint_schema.py (218 lines)
state_manager.py (326 lines)
resume_handler.py (303 lines)

Strengths

✅ Well-designed checkpoint schema with proper versioning ✅ Atomic file writes to prevent corruption ✅ Book hash validation to detect input changes ✅ Good progress tracking per stage ✅ Graceful interrupt handling with checkpoint saving ✅ Clear separation between StateManager and ResumeHandler

Suggestions (non-blocking)

1. resume_handler.py:121-122 - Dead code

if self._checkpoint is None and self.should_resume():
    pass

This does nothing and should be removed.

2. resume_handler.py:207-208 - Dead code

if self._checkpoint is None and self.should_resume():
    pass

Another dead code block that should be removed.

3. checkpoint_schema.py:154 - Potential KeyError

return CheckpointStage[self.current_stage.upper()]

Could raise KeyError if current_stage is set to an invalid value. Consider using .get() instead.

4. state_manager.py:155-156, 188, 210 - Import inside function

from src.checkpoint.checkpoint_schema import StageProgress

These imports should be at module level for efficiency.

5. state_manager.py:319-324 - Directory hash performance

compute_directory_hash reads all files which could be slow for large directories. Consider caching or using mtime-based approach.

Overall Assessment

Solid checkpoint and resume implementation. The issues identified are minor and do not block functionality.

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