feat: Initialize NestJS backend project with Prisma, core modules, configuration, and common utilities.

src/prisma/index.ts

@@ -0,0 +1,2 @@
+export * from './prisma.module';
+export * from './prisma.service';

src/prisma/prisma.module.ts

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+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from './prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}

src/prisma/prisma.service.ts

@@ -0,0 +1,45 @@
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService
+  extends PrismaClient
+  implements OnModuleInit, OnModuleDestroy
+{
+  constructor() {
+    super({
+      log:
+        process.env.NODE_ENV === 'development'
+          ? ['query', 'info', 'warn', 'error']
+          : ['error'],
+    });
+  }
+
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect();
+  }
+
+  async cleanDatabase() {
+    if (process.env.NODE_ENV === 'production') {
+      throw new Error('cleanDatabase is not allowed in production');
+    }
+
+    const models = Reflect.ownKeys(this).filter(
+      (key) => typeof key === 'string' && !key.startsWith('_') && !key.startsWith('$'),
+    );
+
+    return Promise.all(
+      models.map((modelKey) => {
+        const model = this[modelKey as string];
+        if (model && typeof model.deleteMany === 'function') {
+          return model.deleteMany();
+        }
+        return Promise.resolve();
+      }),
+    );
+  }
+}