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.env.example

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+# Server
+PORT=3001
+JWT_SECRET=your-secure-random-secret-key-here
+CORS_ORIGINS=http://localhost:5173,http://localhost:3000
+
+# Database (PostgreSQL)
+DATABASE_URL=postgresql://user:password@localhost:5432/vortex
+
+# Message encryption (AES-256-GCM) — 64-char hex key (32 bytes)
+# Generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+# WARNING: if you lose this key, all encrypted messages become unreadable!
+ENCRYPTION_KEY=
+
+# TURN server for voice/video calls (optional, recommended for production)
+# Install coturn: sudo apt install coturn
+# TURN_URL=turn:your-domain.com:3478
+# TURN_SECRET=your-coturn-shared-secret
+# STUN_URLS=stun:stun.l.google.com:19302,stun:stun1.l.google.com:19302