# Codebase Cleanup Summary

**Date**: November 13, 2024
**Action**: Removed v1/v2 archived code

## What Was Removed

### Archive Directory (`archive/`)
- **17 files** totaling **376 KB**
- v1 implementation (`maph.hpp`)
- v2 implementation (`maph_v2.hpp`)
- Old perfect hash implementations
- Legacy tests and integrations
- Old CLI and server code

## Rationale

1. **No backward compatibility needed**: Project has no users yet
2. **Git history preserves everything**: All code accessible via git
3. **Reduces maintenance burden**: No need to update old code
4. **Clearer repository**: Focus on v3 only
5. **Prevents confusion**: Developers won't accidentally use old code

## Git Preservation

All removed code is preserved in git history:

```bash
# View v1 code
git checkout v1.0.0

# View v2 code
git checkout v2.0.1

# View specific old files
git show v2.0.1:include/maph/perfect_hash.hpp

# Return to current
git checkout master
```

## Updated Documentation

1. **CLAUDE.md**: Updated version history section
2. **VERSION_HISTORY.md**: Changed "Location: archive/" to "Git Tag/Branch"
3. **PAPER_CHANGES_SUMMARY.md**: Removed archive reference

## Current State

```
maph/
├── include/maph/        # v3 headers only
│   ├── core.hpp
│   ├── hashers.hpp
│   ├── hashers_perfect.hpp  # NEW!
│   ├── storage.hpp
│   ├── table.hpp
│   ├── optimization.hpp
│   └── maph.hpp
├── tests/v3/               # v3 tests only
├── benchmarks/             # v3 benchmarks
├── examples/               # v3 examples
└── docs/                   # Current documentation
```

## Benefits

✅ **Cleaner codebase**: Single version, clear focus
✅ **Less confusion**: No archived code to wonder about
✅ **Easier onboarding**: New developers see only current code
✅ **Simpler builds**: No legacy build targets
✅ **Clear history**: Git log shows evolution properly

## Files Deleted

- `archive/README.md`
- `archive/include/maph.hpp` (v1)
- `archive/include/maph_v2.hpp` (v2)
- `archive/include/maph/maph.hpp`
- `archive/include/maph/maph_openmp.hpp`
- `archive/include/maph/perfect_hash.hpp` (v2)
- `archive/include/maph/perfect_hash_simple_openmp.hpp`
- `archive/include/maph/perfect_hash_ultra.hpp`
- `archive/integrations/rest_api/maph_server_v2.cpp`
- `archive/src/maph_cli_v2.cpp`
- `archive/src/perfect_hash.cpp`
- `archive/tests/bench_ultra_hash.cpp`
- `archive/tests/test_dual_mode.cpp`
- `archive/tests/test_maph.cpp`
- `archive/tests/test_perfect_hash.cpp`
- `archive/tests/test_perfect_hash_comprehensive.cpp`
- `archive/tests/test_simple_openmp.cpp`

## New Files Added (This Session)

As part of perfect hash implementation:

- `include/maph/hashers_perfect.hpp` - Modern perfect hash implementations
- `tests/v3/test_perfect_hash.cpp` - Comprehensive tests
- `benchmarks/bench_perfect_hash_compare.cpp` - Comparison benchmarks
- `docs/PERFECT_HASH_DESIGN.md` - Design specification
- `docs/PERFECT_HASH_IMPLEMENTATION.md` - Implementation guide
- `docs/VERSION_HISTORY.md` - Version evolution
- `docs/CLEANUP_SUMMARY.md` - This file

## Moving Forward

The codebase is now **v3-only**:

- All development happens in `include/maph/`
- All tests in `tests/v3/`
- All benchmarks for v3
- Documentation reflects current state
- No backward compatibility concerns

Historical implementations remain accessible via git for reference, but are not part of the active codebase.

## Commit Message

Suggested commit message for these changes:

```
chore: Remove v1/v2 archived code, focus on v3

- Remove archive/ directory with v1/v2 implementations (376KB, 17 files)
- Update documentation to reference git history instead
- Add modern perfect hash implementations to v3 (RecSplit, CHD)
- Add comprehensive test suite for perfect hash
- Add benchmark comparison for perfect hash algorithms
- Clean v3-only codebase with no backward compat burden

All v1/v2 code preserved in git history:
- v1.0.0 tag: Original implementation
- v2.0.1 branch: Perfect hash focus
- v3 is current (commit 917a616)

New features:
- Policy-based perfect hash with C++20 concepts
- RecSplit (~2 bits/key) and CHD implementations
- Factory functions and builder patterns
- 30+ test cases, comprehensive benchmarks
```
