Brownfield Asset Relocation Process (Post-Dependency Hoisting) Phase 1: Foundation (Completed - Dependency Hoisting) ✅ Dependency Consolidation: Unified package management, build systems ✅ Workspace Structure: Domain boundaries, service adapters ✅ Baseline Configuration: Consolidated configs, linting, Docker Phase 2: Data Layer Migration Goal: Establish unified data architecture before moving business logic
Schema Analysis & Mapping
Extract existing schemas from all legacy systems Design unified schema with domain separation Create data migration scripts with rollback capabilities Data Format Conversion
Handle diverse formats (SQL, NoSQL, CRDT, binary, time-series) Implement conversion utilities with integrity validation Test data preservation with checksums Authentication Consolidation
Merge separate user systems into unified auth Preserve existing access patterns during transition Implement session management for concurrent tools Phase 3: API Layer Abstraction Goal: Create unified API surface before moving UIs
Service Interface Design
Extract existing API patterns from legacy tools Design domain-specific API boundaries Create backward-compatible adapters Business Logic Extraction
Identify core algorithms vs presentation logic Extract business rules into domain services Implement validation layers Phase 4: UI Integration Strategy Goal: Unified user experience while preserving functionality
Interface Preservation Analysis
Categorize UIs: iframe embedding vs component integration vs API-only Document existing user workflows Design unified navigation patterns Progressive UI Migration
Start with wrapper/iframe approach for complex UIs Gradually migrate to native components where feasible Maintain user familiarity during transition Phase 5: Domain-by-Domain Asset Relocation Goal: Move complete business domains while maintaining operations
This is where the current tasks pick up. The typical pattern per domain:
Ground Truth Establishment
Document expected behavior from original systems Create comprehensive test suites Establish performance baselines Asset Porting (Category-Based)
Category A (Complex Algorithms): Preserve in microservices if needed Category B (Domain Logic): Migrate to modular monolith services Category C (Utilities): Move to shared libraries Validation & Integration
Run automated regression tests against original Validate performance meets domain requirements Test cross-domain workflows Phase 6: Optimization & Polish Goal: Performance tuning and production readiness
Performance Optimization
Domain-specific performance validation Cross-tool synchronization optimization Resource usage optimization Production Hardening
Security audit of consolidated system Monitoring and alerting setup Disaster recovery procedures Key Brownfield Principles
- Incremental Migration Never "big bang" the entire system at once Always maintain operational capability Rollback procedures for every step
- Ground Truth Preservation Original systems remain operational during migration Comprehensive testing against known-good behavior Data integrity validation at every step
- Category-Based Preservation Category A: Complex algorithms that need special handling Category B: Standard business logic suitable for integration Category C: Utilities that can be shared/consolidated
- Risk Mitigation Extensive backup strategies Automated testing frameworks Performance monitoring User workflow preservation Why This Order Matters Dependencies First: Can't move code without proper build/package management Data Second: Business logic depends on data access patterns APIs Third: UIs depend on service interfaces UIs Fourth: User experience depends on underlying services Domain Migration: Complete vertical slices with full testing Optimization Last: Performance tuning after functionality is preserved