Replace the 5-file sliding window cross-run dedup with a persistent
hash index that covers ALL historical training data. Overfitting risk
compounds across the full dataset — a 5-file window lets old duplicates
leak back into training after enough overnight runs.
New module: dedup_index.py (DedupIndex)
- Persistent JSON index (.dpo_dedup_index.json) alongside JSONL files
- Append-on-export: new prompt hashes registered after each successful
export — no full rescan needed for normal operations
- Incremental sync: on load, detects JSONL files not yet indexed and
ingests them automatically (handles files from other tools)
- Full rebuild: rebuild() scans ALL deepdive_*.jsonl + pairs_*.jsonl
to reconstruct from scratch (first run, corruption recovery)
- Atomic writes (write-to-tmp + rename) to prevent index corruption
- Standalone CLI: python3 dedup_index.py <dir> --rebuild --stats
Modified: dpo_quality.py
- Imports DedupIndex with graceful degradation
- Replaces _load_history_hashes() with persistent index lookup
- Fallback: if index unavailable, scans ALL files in-memory (not just 5)
- New register_exported_hashes() method called after export
- Config key: dedup_full_history (replaces dedup_history_files)
Modified: dpo_generator.py
- Calls validator.register_exported_hashes() after successful export
to keep the persistent index current without rescanning
Modified: config.yaml
- Replaced dedup_history_files: 5 with dedup_full_history: true
Tested — 7 integration tests:
✓ Fresh index build from empty directory
✓ Build from 3 existing JSONL files (15 unique hashes)
✓ Incremental sync when new file appears between runs
✓ Append after export + persistence across reloads
✓ Rebuild from scratch (recovers from corruption)
✓ Validator catches day-1 dupe from 20-day history (5-file window miss)
✓ Full pipeline: generate → validate → export → register → re-run detects
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