feat: creates backend for the project

backend/src/app.ts

@@ -0,0 +1,56 @@
+import express from 'express';
+import cookieParser from 'cookie-parser';
+import cors from 'cors';
+import { config } from './config';
+import { runMigrations } from './db/migrate';
+import { requireAuth } from './middleware/auth';
+
+import authRouter from './routes/auth';
+import importRouter from './routes/import';
+import transactionsRouter from './routes/transactions';
+import accountsRouter from './routes/accounts';
+import categoriesRouter from './routes/categories';
+import categoryRulesRouter from './routes/categoryRules';
+import analyticsRouter from './routes/analytics';
+
+const app = express();
+
+app.use(express.json({ limit: '10mb' }));
+app.use(cookieParser());
+app.use(cors({ origin: true, credentials: true }));
+
+// Auth routes (login is public; me/logout apply auth internally)
+app.use('/api/auth', authRouter);
+
+// All remaining /api routes require authentication
+app.use('/api', requireAuth);
+app.use('/api/import', importRouter);
+app.use('/api/transactions', transactionsRouter);
+app.use('/api/accounts', accountsRouter);
+app.use('/api/categories', categoriesRouter);
+app.use('/api/category-rules', categoryRulesRouter);
+app.use('/api/analytics', analyticsRouter);
+
+app.use(
+  (
+    err: Error,
+    _req: express.Request,
+    res: express.Response,
+    _next: express.NextFunction,
+  ) => {
+    console.error(err);
+    res.status(500).json({ error: 'INTERNAL_ERROR', message: 'Internal server error' });
+  },
+);
+
+async function start() {
+  await runMigrations();
+  app.listen(config.port, () => {
+    console.log(`Backend listening on port ${config.port}`);
+  });
+}
+
+start().catch((err) => {
+  console.error('Failed to start:', err);
+  process.exit(1);
+});