# T4 – Quality Dashboard & Transformation Sign-off

**Generated:** 2026-11-10 15:33:57  
**Database:** `data/hiffi_catalog.db`  
**Status:** **PASSED & VERIFIED**

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## 1. Before vs. After Transformation Summary

| Dimension | Raw Ingested State (Before) | Cleaned Backend State (After) | Status |
|---|---|---|---|
| **Cohort Size** | 501 artists (drift detected) | **Strictly 500 verified artists** (50/150/300) | **RESOLVED** |
| **Sales Methodology** | Synthetic streaming EAS inflation | **100% empirical pure sales** (`streaming_eas == 0.0`) | **RESOLVED** |
| **Sales Ingestion** | 530 component math mismatches | **0 mismatches**, exact parity with master CSV | **RESOLVED** |
| **Ranking Coverage** | Unindexed catalog | **Dense ranks #1 to #17,135** | **RESOLVED** |
| **Telemetry History** | Sparse delta tracking | **6,000 snapshots** across all 500 cohort artists | **RESOLVED** |

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## 2. Interactive Deliverable
- Interactive visual dashboard generated at: `data/quality_dashboard.html`
- Automated recurring check registered in: `scripts/generate_t4_dashboard.py`