HISTORICAL DATA QUALITY ANALYZER
Why did my historical report change?
Analyze historical target tables directly in your browser and understand why reports change after rebuilds, corrections and temporal joins.
Guided investigation
Revenue increased overnight. No new orders arrived.
Walk through one historical data incident. Click anywhere, press Space, Enter or → to advance.
Or choose another sample investigation
Or use your own data
Investigate your own historical data
Paste or upload a CSV output from a notebook, dbt model or pipeline. Analysis runs in your browser; nothing is stored.
Historical Modeling AssessmentAssess your historical modeling requirements
Answer a few questions and get a recommended historical modeling strategy.
Start Assessment
Answer 6 questions about your historical model.
Get a recommended modeling strategy, relevant historical patterns, implementation risks and validation checks for your reporting model.
✓ Takes less than 1 minute
✓ Recommends modeling patterns
✓ Highlights validation risks
✓ Generates an implementation blueprint
Advanced investigation
Compare Historical Sources
Use this expert workflow after the model exists and you need row-level temporal evidence for joins, gaps, overlaps or visibility issues.
Advanced Historical Source ComparisonCompare two historized sources when you need row-level timeline evidence, temporal joins or overlap diagnostics.
Compare two historized datasets when you need row-level evidence for temporal joins, source-vs-target validation, SCD2 coverage or late-arriving history.
Upload → Analyze → Inspect findings
🔒 Uploaded datasets are processed locally in your browser and are not stored on our servers.
A
Source A
⇧
Upload or paste
CSV, TSV or TXT
Auto-mapped columns: entity_id, value, valid_from, valid_to, visible_from, visible_to.
B
Source B
⇧
Upload or paste
CSV, TSV or TXT
Auto-mapped columns: entity_id, value, valid_from, valid_to, visible_from, visible_to.
Built for historical data modeling, temporal joins, snapshot reporting and historized data validation.
Feedback, ideas or collaboration welcome.