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🔄 Database Migration Plan (Prisma → Drizzle / Supabase)

🎯 Goal​

Enable a non-breaking migration from Prisma ORM to a more flexible stack such as Drizzle ORM or Supabase, without rewriting your API layer.

🧩 Migration Strategy​

1. Introduce Repository Abstraction Layer​

Instead of calling Prisma directly:

// ❌ avoid
this.prisma.product.findMany()

Use a repository pattern:

// ✅ abstraction
this.productRepository.findAll()

2. 📐 Architecture Flow​

3. 🔀 Dual-ORM Transition Phase​

During migration:

4. ✈️ Migration Steps​

  1. Add repository interfaces
  2. Wrap all Prisma queries
  3. Introduce Drizzle implementation
  4. Toggle via environment flag:
DB_PROVIDER=prisma
# or
DB_PROVIDER=drizzle
  1. Gradually switch endpoints
  2. Remove Prisma after validation

⚠️ Key Considerations​

  • Keep DTOs stable (no API breaking changes)
  • Avoid Prisma-specific types leaking into services
  • Ensure migrations are replicated in both systems
  • Use integration tests to validate parity

🔐 Authentication Architecture (Cookie-Based Sessions)​

🎯 Goal​

Implement secure, scalable authentication using HTTP-only cookies + session storage

🧩 Auth Flow​

🧩 Architecture Overview​

🔑 Key Decisions​

Why Cookies over JWT?

  • ✅ Automatic browser handling
  • ✅ Safer against XSS (httpOnly)
  • ✅ Easier session invalidation
  • ❌ Requires session store (Redis recommended)
{
  httpOnly: true,
  secure: true,
  sameSite: 'lax',
  maxAge: 7 * 24 * 60 * 60 * 1000
}

🧩 Session Store Options​

  • Redis (recommended for scaling)
  • Database (simpler, slower)
  • In-memory (dev only)

🏷️ Semantic Versioning Strategy (Per Phase)