feat: initialize API gateway, fraud detection database config, and user service entry point

Author: raorajan

server/api-gateway/src/server.ts

@@ -250,6 +250,11 @@ app.use('/api/v1', proxy(API_USER_URL, {
   userResHeaderDecorator: (headers, req) => processCorsHeaders(headers, req as Request)
 }));
 
+app.get('/health', proxy(API_USER_URL, {
+  proxyReqPathResolver: () => '/health',
+  proxyErrorHandler: (err, res, next) => onProxyError(err, res, API_USER_URL)
+}));
+
 app.get('/', (req: Request, res: Response) => {
   res.json({ success: true, message: 'API Gateway is running' });
 });

server/fraud-detection-service/src/config/database.ts

@@ -7,7 +7,7 @@ import * as schema from '../models';
 dotenv.config();
 
 // Supabase Connection using PG protocol
-const connectionString = `postgres://${process.env.DB_USER}:${process.env.DB_PASSWORD}@${process.env.DB_HOST}:${process.env.DB_PORT}/${process.env.DB_NAME}?sslmode=require`;
+const connectionString = process.env.DATABASE_URL || `postgres://${process.env.DB_USER}:${process.env.DB_PASSWORD}@${process.env.DB_HOST}:${process.env.DB_PORT}/${process.env.DB_NAME}?sslmode=require`;
 
 const client = postgres(connectionString, { prepare: false });
 export const db = drizzle(client, { schema });

server/user-services/src/server.ts

@@ -1,7 +1,8 @@
 import express, { Application, Request, Response } from 'express';
 import dotenv from 'dotenv';
 import helmet from 'helmet';
-import { connectDB } from './config/database';
+import { connectDB, db } from './config/database';
+import { sql } from 'drizzle-orm';
 import authRoutes from './routes/auth.routes';
 import passport from './config/passport';
 
@@ -25,6 +26,15 @@ app.get('/', (req: Request, res: Response) => {
   res.json({ message: 'Welcome to User Service' });
 });
 
+app.get('/health', async (req: Request, res: Response) => {
+  try {
+    await db.execute(sql`SELECT 1`);
+    res.status(200).json({ success: true, message: 'User Service & Database are healthy' });
+  } catch (error) {
+    res.status(500).json({ success: false, message: 'Database connection failed' });
+  }
+});
+
 // Auth routes
 app.use('/api/v1', authRoutes);