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.env.example

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+# ============================
+# ENVIRONMENT
+# ============================
+NODE_ENV=production
+DEBUG=false
+
+# ============================
+# SERVER
+# ============================
+PORT=3000
+API_PORT=3000
+API_HOST=0.0.0.0
+FRONTEND_PORT=80
+
+# ============================
+# DATABASE (PostgreSQL)
+# ============================
+DB_HOST=postgres
+DB_PORT=5432
+DB_NAME=pg_admin
+DB_USER=postgres
+DB_PASSWORD=CHANGE_ME_SECURE_PASSWORD
+DB_HOST_DEV=localhost
+
+# Connection pool
+MAX_CONNECTIONS=20
+CONNECTION_TIMEOUT=5000
+IDLE_TIMEOUT=30000
+
+# ============================
+# AUTHENTICATION & SECURITY
+# ============================
+JWT_SECRET=CHANGE_ME_SUPER_SECRET_JWT_KEY
+JWT_EXPIRE=7d
+
+# ============================
+# REDIS CACHE
+# ============================
+REDIS_HOST=redis
+REDIS_PORT=6379
+REDIS_PASSWORD=CHANGE_ME_REDIS_PASSWORD
+REDIS_DB=0
+
+# ============================
+# FRONTEND
+# ============================
+FRONTEND_API_URL=http://api.yourdomain.com/api
+REACT_APP_ENV=production
+
+# ============================
+# NGINX
+# ============================
+NGINX_PORT=8080
+
+# ============================
+# CORS & RATE LIMITING
+# ============================
+CORS_ORIGIN=https://yourdomain.com
+RATE_LIMIT_WINDOW=15
+RATE_LIMIT_MAX_REQUESTS=100
+
+# ============================
+# LOGGING
+# ============================
+LOG_LEVEL=warn
+LOG_FORMAT=json
+
+# ============================
+# MONITORING
+# ============================
+SENTRY_DSN=https://your-sentry-dsn@sentry.io/project-id
+