enhancements.md

📈 Data Warehouse Project Enhancement Roadmap

This checklist outlines enhancements to showcase enterprise-grade SQL Server Data Warehouse design, ETL flow, performance, and BI integration.

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🔗 Data Sources & Staging

• Simulate multiple raw data feeds: CRM, Sales, HR
• Create staging tables for each source
• Implement incremental loading logic (MERGE or upsert strategy)

📐 Schema Design

• Create star schema: FactSales, DimCustomer, DimProduct, DimDate
• Add surrogate keys for all dimension tables
• Handle Slowly Changing Dimensions (SCD Type 1 and 2)

🧰 T-SQL Optimization

• Use indexes on Fact and Dim tables
• Partition Fact tables (by date or product)
• Create views and indexed views for reporting
• Use stored procedures for repeatable transformations

🔁 ETL Strategy

• Design full and incremental ETL procedures
• Simulate or outline SSIS equivalent flow
• Add error logging and auditing mechanism (ETL log table)

📊 BI & Reporting Layer

• Create Power BI dashboards (Sales, Customer trends)
• Export .pbix files and screenshots to Reports/
• Include basic KPIs: revenue, AOV, churn, etc.

🧪 Testing and QA

• Data quality validation scripts (check nulls, keys, duplicates)
• Sample test data included in Sample_Data/
• Document transformation logic and test cases

📄 Documentation

• Add ER diagrams and flowcharts to Diagrams/
• Write data dictionary (Fact and Dim descriptions)
• Update README with updated architecture and usage details

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✅ Optional Advanced Additions

• Docker setup with SQL Server Express
• CI/CD using GitHub Actions to test scripts
• Role-based access modeling (views per team role)