fix(backend): type prisma singleton globals correctly

[samueloyibodevv]

Overview

This PR fixes the typing on the Prisma hot-reload singleton in backend/src/lib/prisma.ts. The global cache now correctly marks prisma and pool as optional, which matches the existing if (!...) initialization logic and removes the small type lie without changing runtime behavior.

Related Issue

Closes #653

Changes

🔧 Prisma singleton typing

• [MODIFY] backend/src/lib/prisma.ts
• Changed the global singleton annotation so both cached properties are optional:
  • prisma?: PrismaClient
  • pool?: pg.Pool
• Kept the existing singleton pattern intact.
• Preserved the current || fallback and if (!...) initialization checks.

Verification Results

Acceptance Criteria	Status
prisma and pool are typed as optional	✅
Build still passes	✅
Singleton runtime behavior remains unchanged	✅

How to Test

# 1. Confirm you're on the branch
git branch --show-current

# 2. Verify the backend builds successfully
npm run build

# 3. Optional: inspect the typing change
git diff -- backend/src/lib/prisma.ts

Screenshots

✅ Backend build passes

Run:

npm run build

[ogazboiz]

clean — closes #653 (prisma singleton globals now typed properly, no any cast). all CI green. merging!

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