diff --git a/apps/backend/test/app.e2e-spec.ts b/apps/backend/test/app.e2e-spec.ts
index 569012b..1ab26c7 100644
--- a/apps/backend/test/app.e2e-spec.ts
+++ b/apps/backend/test/app.e2e-spec.ts
@@ -1,6 +1,6 @@
 import { Test, TestingModule } from '@nestjs/testing';
 import { INestApplication } from '@nestjs/common';
-import * as request from 'supertest';
+import request from 'supertest';
 import { AppModule } from '../src/app.module';
 
 describe('AppController (e2e)', () => {
diff --git a/apps/backend/test/integration/redis-cache.spec.ts b/apps/backend/test/integration/redis-cache.spec.ts
new file mode 100644
index 0000000..4b9bcb2
--- /dev/null
+++ b/apps/backend/test/integration/redis-cache.spec.ts
@@ -0,0 +1,45 @@
+import { randomUUID } from 'crypto';
+import { ConfigService } from '@nestjs/config';
+import { RedisCacheAdapter } from '../../src/infrastructure/cache/redis-cache.adapter';
+
+describe('Redis cache integration', () => {
+  let cache: RedisCacheAdapter;
+  const prefix = `integration:${randomUUID()}:`;
+  const keys = ['value', 'expires'].map(key => `${prefix}${key}`);
+
+  beforeAll(async () => {
+    cache = new RedisCacheAdapter(
+      new ConfigService({
+        REDIS_HOST: process.env.REDIS_HOST,
+        REDIS_PORT: Number(process.env.REDIS_PORT),
+        REDIS_PASSWORD: process.env.REDIS_PASSWORD || undefined,
+        REDIS_DB: Number(process.env.REDIS_DB),
+      })
+    );
+    await cache.onModuleInit();
+  });
+
+  afterAll(async () => {
+    try {
+      // Delete only this suite's keys; never flush a shared database.
+      await cache.deleteMany(keys);
+    } finally {
+      await cache.onModuleDestroy();
+    }
+  });
+
+  it('round-trips cached application data and invalidates it', async () => {
+    const value = { amount: 125.5, currency: 'EUR', ports: ['FRLEH', 'USNYC'] };
+    await cache.set(keys[0], value, 60);
+    expect(await cache.get(keys[0])).toEqual(value);
+    await cache.delete(keys[0]);
+    expect(await cache.get(keys[0])).toBeNull();
+  });
+
+  it('expires cached data using the server TTL', async () => {
+    await cache.set(keys[1], { valid: true }, 1);
+    expect(await cache.exists(keys[1])).toBe(true);
+    await new Promise(resolve => setTimeout(resolve, 1200));
+    expect(await cache.exists(keys[1])).toBe(false);
+  });
+});
diff --git a/apps/backend/test/jest-integration.json b/apps/backend/test/jest-integration.json
index ff52b85..f6f086d 100644
--- a/apps/backend/test/jest-integration.json
+++ b/apps/backend/test/jest-integration.json
@@ -1,7 +1,10 @@
 {
   "moduleFileExtensions": ["js", "json", "ts"],
   "rootDir": "../",
-  "testMatch": ["**/test/integration/**/*.spec.ts"],
+  "testMatch": [
+    "<rootDir>/test/integration/**/*.spec.ts",
+    "<rootDir>/src/infrastructure/persistence/typeorm/repositories/typeorm-trade-quota.repository.spec.ts"
+  ],
   "transform": {
     "^.+\\.(t|j)s$": [
       "ts-jest",
@@ -19,7 +22,7 @@
   "testEnvironment": "node",
   "moduleNameMapper": {
     "^@domain/(.*)$": "<rootDir>/src/domain/$1",
-    "@application/(.*)$": "<rootDir>/src/application/$1",
+    "^@application/(.*)$": "<rootDir>/src/application/$1",
     "^@infrastructure/(.*)$": "<rootDir>/src/infrastructure/$1"
   },
   "transformIgnorePatterns": ["node_modules/(?!(@faker-js)/)"],
diff --git a/apps/backend/test/setup-integration.ts b/apps/backend/test/setup-integration.ts
index ffc57aa..fada399 100644
--- a/apps/backend/test/setup-integration.ts
+++ b/apps/backend/test/setup-integration.ts
@@ -11,6 +11,18 @@ process.env.TEST_DB_USER = process.env.TEST_DB_USER || 'postgres';
 process.env.TEST_DB_PASSWORD = process.env.TEST_DB_PASSWORD || 'postgres';
 process.env.TEST_DB_NAME = process.env.TEST_DB_NAME || 'xpeditis_test';
 
+// Enable the repository integration suite using the disposable CI service.
+// Never fall back to DATABASE_* (the application's deployment connection).
+if (!process.env.TRADE_TEST_DATABASE_URL) {
+  const database = new URL('postgresql://localhost');
+  database.hostname = process.env.TEST_DB_HOST;
+  database.port = process.env.TEST_DB_PORT;
+  database.username = process.env.TEST_DB_USER;
+  database.password = process.env.TEST_DB_PASSWORD;
+  database.pathname = `/${process.env.TEST_DB_NAME}`;
+  process.env.TRADE_TEST_DATABASE_URL = database.toString();
+}
+
 // Redis test configuration
 process.env.REDIS_HOST = process.env.REDIS_HOST || 'localhost';
 process.env.REDIS_PORT = process.env.REDIS_PORT || '6379';