- Return LoadResult struct instead of multiple values, with Warnings slice
for testability (no more hardcoded stderr output)
- Add ID validation in AppendDeletion to prevent invalid records
- Add Sync() call in AppendDeletion for durability
- Document that timestamps may lose sub-second precision
- Document that empty slice in WriteDeletions clears all deletions
- Add test for empty ID validation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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