Version Delta Documents

This folder contains detailed "what changed" documentation between major product versions.

Purpose

Delta documents help engineering teams understand:

• Breaking changes that require migration planning
• New features and capabilities added
• Database schema changes (tables added, modified, removed)
• Migration path and rollout strategy
• Backward compatibility considerations
• Deprecations and sunset timelines

Files in This Folder

v1_delta-from-mvp.md

Transition: MVP.2 → V1.0 Timeline: Month 6-7 (Migration period) Scope: Adding direct booking engine and payment processing

Key Changes:

• +8 tables (28 total)
• New domains: Full Bookings, Payments, Search
• Breaking changes: Revenue split calculation, authentication model
• 4,800 properties capacity increase (200 → 5,000)

Migration Complexity: High (6-phase rollout over 18 weeks)

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v2_delta-from-v1.md

Transition: V1.0 → V2.0 Timeline: Month 12-13 (Migration period) Scope: Adding events, ticketing, and experiences

Key Changes:

• +8 tables (36 total)
• New domain: Events & Experiences (full)
• Breaking changes: Availability model (single → multi-type inventory)
• 5,000 properties capacity increase (5,000 → 10,000)

Migration Complexity: Medium (4-phase rollout over 12 weeks)

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v3_delta-from-v2.md

Transition: V2.0 → V3.0 Timeline: Month 18-19 (Migration period) Scope: Multi-vendor marketplace and white-label capabilities

Key Changes:

• +18 tables (54 total)
• Enhanced domains: Delegation (full multi-org), Search (marketplace)
• Breaking changes: Tenant model (single → multi-vendor)
• 40,000+ properties capacity increase (10,000 → 50,000+)

Migration Complexity: Very High (6-phase rollout over 24 weeks)

How to Use Delta Documents

For Product Managers

1. Review "Business Impact" section for customer-facing changes
2. Check "Feature Additions" for new capabilities to communicate
3. Understand "Deprecation Timeline" for sunset planning
4. Use "Success Metrics" for launch planning

For Engineers

1. Start with "Breaking Changes" section (critical!)
2. Review "Database Schema Changes" for migration planning
3. Check "API Changes" for contract modifications
4. Follow "Migration Path" for step-by-step rollout
5. Reference "Rollback Strategy" for contingency planning

For QA/Test Engineers

1. Focus on "Breaking Changes" for regression testing
2. Check "Feature Additions" for new test coverage
3. Review "Migration Path" phases for staged testing
4. Use "Validation Checklist" for go/no-go criteria

For DevOps/SRE

1. Review "Infrastructure Changes" for capacity planning
2. Check "Migration Path" for deployment sequence
3. Understand "Rollback Strategy" for incident response
4. Monitor "Performance Considerations" for scaling

Quick Reference: What's New in Each Version

Version	Tables Added	Key Features	Migration Complexity
V1.0	+8 (28 total)	Booking engine, Payments, Search	High (18 weeks)
V2.0	+8 (36 total)	Events, Ticketing, Packages	Medium (12 weeks)
V3.0	+18 (54 total)	Multi-vendor, White-label	Very High (24 weeks)

Related Documentation

• Product Specifications - Complete version specs
• Data Models - Full database schemas by version
• Migration Scripts - SQL migration files
• Domain Specifications - Detailed domain logic
• Roadmap - Complete timeline and milestones

Migration Planning Resources

• Product Versioning Strategy - How we version features
• Multi-Tenancy Implementation - Tenant isolation patterns
• RLS Policy Patterns - Security migration considerations