MISSION BRIEF / Data
SQL-to-PostgreSQL Data Migration
A Python console for mapping, transforming and monitoring a large SQL-to-PostgreSQL migration.
Explore architecture ↓Sanitized engineering overview. The diagram is an original redraw with generic labels; business identifiers and production details are omitted.
MY ROLE
Engineering contribution to a team migration and its Python console, including source-to-target field mapping and data transformation.
The problem
Move a large dataset between different schemas while preserving relationships and validating how source fields map to the PostgreSQL target.
Architecture
Python console · control, monitor, report, map and tune
Staging retains migration state; reconciliation reads and compares records.
TRACE A STAGE
Select a stage to inspect its connections.
Engineering decisions
- Define explicit source-to-target field mappings before loading records.
- Separate extraction and data preparation from target writes.
- Transform and batch data through a staging layer before migration execution.
- Centralize migration control, monitoring and report generation in the Python console.
- Use the console to tune migration performance alongside mapping and transformation work.
- Keep reconciliation read-only and resolve inconsistencies through a separate repair step.
Challenges
- Mapping fields and relationships between different database schemas.
- Transforming a large dataset into the target representation.
- Coordinating staging, execution, repair and reconciliation without exposing confidential business data.
The solution
A complete Python console brings migration control, progress monitoring, report generation, field and data mapping, transformation and performance tuning into one tool. The staged workflow separates extraction, preparation and execution, retaining migration state for repair and reconciliation.
The result
The team built the Python migration console, mapped source fields and transformed the data for PostgreSQL. The tool supports monitoring, reports and performance tuning; this overview does not publish customer data, operational volumes or measured performance claims.