feat(backend): wait for DB on start

backend/src/config/database.js

@@ -54,6 +54,33 @@ async function checkDatabaseConnection(prisma) {
   }
 }
 
+// Wait for database to be available with retry logic
+async function waitForDatabase(prisma, options = {}) {
+  const maxAttempts = options.maxAttempts || parseInt(process.env.DB_MAX_ATTEMPTS) || 30;
+  const waitInterval = options.waitInterval || parseInt(process.env.DB_WAIT_INTERVAL) || 2;
+
+  console.log(`Waiting for database connection (max ${maxAttempts} attempts, ${waitInterval}s interval)...`);
+
+  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
+    try {
+      const isConnected = await checkDatabaseConnection(prisma);
+      if (isConnected) {
+        console.log(`Database connected successfully after ${attempt} attempt(s)`);
+        return true;
+      }
+    } catch (error) {
+      // checkDatabaseConnection already logs the error
+    }
+
+    if (attempt < maxAttempts) {
+      console.log(`⏳ Database not ready (attempt ${attempt}/${maxAttempts}), retrying in ${waitInterval}s...`);
+      await new Promise(resolve => setTimeout(resolve, waitInterval * 1000));
+    }
+  }
+
+  throw new Error(`❌ Database failed to become available after ${maxAttempts} attempts`);
+}
+
 // Graceful disconnect with retry
 async function disconnectPrisma(prisma, maxRetries = 3) {
   for (let i = 0; i < maxRetries; i++) {
@@ -75,6 +102,7 @@ async function disconnectPrisma(prisma, maxRetries = 3) {
 module.exports = {
   createPrismaClient,
   checkDatabaseConnection,
+  waitForDatabase,
   disconnectPrisma,
   getOptimizedDatabaseUrl
 };

backend/src/server.js

@@ -3,7 +3,7 @@ const express = require('express');
 const cors = require('cors');
 const helmet = require('helmet');
 const rateLimit = require('express-rate-limit');
-const { createPrismaClient, checkDatabaseConnection, disconnectPrisma } = require('./config/database');
+const { createPrismaClient, waitForDatabase, disconnectPrisma } = require('./config/database');
 const winston = require('winston');
 
 // Import routes
@@ -341,12 +341,8 @@ process.on('SIGTERM', async () => {
 // Start server with database health check
 async function startServer() {
   try {
-    // Check database connection before starting server
+    // Wait for database to be available
-    const isConnected = await checkDatabaseConnection(prisma);
+    await waitForDatabase(prisma);
-    if (!isConnected) {
-      console.error('❌ Database connection failed. Server not started.');
-      process.exit(1);
-    }
 
     if (process.env.ENABLE_LOGGING === 'true') {
       logger.info('✅ Database connection successful');