primera instancia de validador y carga del excel de usuarios, falta agregar las relaciones con las carreras y verificar los validadores

src/app.module.ts

@@ -1,9 +1,51 @@
-import { Module } from '@nestjs/common';
+import { Logger, Module } from '@nestjs/common';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import * as entities from './entities/entities';
+import { ExcelModule } from './excel/excel.module';
+
+
 @Module({
-  imports: [],
+   imports: [
+    ConfigModule.forRoot({ isGlobal: true }),
+    TypeOrmModule.forRootAsync({
+      imports: [ConfigModule],
+      inject: [ConfigService],
+      useFactory: async (config: ConfigService) => {
+        const dbConfig = {
+          type: 'mysql' as const,
+          host: config.get('DB_HOST', 'localhost'),
+          port: config.get<number>('DB_PORT', 3306),
+          username: config.get('DB_USER', 'root'),
+          // no prints en claro en prod:
+          password: config.get('DB_PASS', ''),
+          database: config.get('DB_NAME', 'test'),
+        };
+        Logger.log('[DB CONFIG] ' + JSON.stringify({
+          ...dbConfig,
+          password: '***'
+        }), 'TypeORM');
+        return {
+          ...dbConfig,
+          entities: Object.values(entities),
+          synchronize: config.get<boolean>('DB_SYNC', true),
+          logging: ['error', 'warn', 'info', 'query', 'schema'],
+          logger: 'advanced-console',
+          retryAttempts: 5,
+          retryDelay: 2000,
+        };
+      },
+    }),
+    TypeOrmModule.forFeature(Object.values(entities)),
+
+
+     ExcelModule,
+
+  ],
   controllers: [AppController],
   providers: [AppService],
 })