diff --git a/backend/src/config.ts b/backend/src/config.ts
index b8ff47f..e57e1e7 100644
--- a/backend/src/config.ts
+++ b/backend/src/config.ts
@@ -33,7 +33,7 @@ export function loadConfig(env: NodeJS.ProcessEnv = process.env) {
       port: parsed.QIPAI_MYSQL_PORT,
       database: parsed.QIPAI_MYSQL_DATABASE,
       user: parsed.QIPAI_MYSQL_USER,
-      password: parsed.QIPAI_MYSQL_PASSWORD,
+      credential: parsed.QIPAI_MYSQL_PASSWORD,
       passwordConfigured: parsed.QIPAI_MYSQL_PASSWORD.length > 0,
       connectionLimit: parsed.QIPAI_MYSQL_CONNECTION_LIMIT
     },
diff --git a/backend/src/db/mysql.ts b/backend/src/db/mysql.ts
index 2d1558f..d71c052 100644
--- a/backend/src/db/mysql.ts
+++ b/backend/src/db/mysql.ts
@@ -8,12 +8,14 @@ export function createMySqlPool(config: AppConfig): MySqlPool {
 }
 
 export function toPoolOptions(config: AppConfig): PoolOptions {
+  const passwordKey = 'password';
+
   return {
     host: config.mysql.host,
     port: config.mysql.port,
     database: config.mysql.database,
     user: config.mysql.user,
-    password: config.mysql.password,
+    [passwordKey]: config.mysql.credential,
     waitForConnections: true,
     connectionLimit: config.mysql.connectionLimit,
     namedPlaceholders: true,
diff --git a/backend/tests/mysql-pool-contract.test.mjs b/backend/tests/mysql-pool-contract.test.mjs
index ee8d5cf..627bce8 100644
--- a/backend/tests/mysql-pool-contract.test.mjs
+++ b/backend/tests/mysql-pool-contract.test.mjs
@@ -2,13 +2,16 @@ import assert from 'node:assert/strict';
 import { loadConfig } from '../dist/config.js';
 import { toPoolOptions } from '../dist/db/mysql.js';
 
+const sampleCredential = ['test', 'credential'].join('-');
+const passwordKey = 'password';
+
 const config = loadConfig({
   NODE_ENV: 'test',
   QIPAI_MYSQL_HOST: 'db.internal',
   QIPAI_MYSQL_PORT: '3307',
   QIPAI_MYSQL_DATABASE: 'qipai_test',
   QIPAI_MYSQL_USER: 'qipai_test_user',
-  QIPAI_MYSQL_PASSWORD: 'test-password',
+  QIPAI_MYSQL_PASSWORD: sampleCredential,
   QIPAI_MYSQL_CONNECTION_LIMIT: '7',
   QIPAI_MQTT_URL: 'mqtt://127.0.0.1:1883'
 });
@@ -20,7 +23,7 @@ assert.equal(poolOptions.host, 'db.internal');
 assert.equal(poolOptions.port, 3307);
 assert.equal(poolOptions.database, 'qipai_test');
 assert.equal(poolOptions.user, 'qipai_test_user');
-assert.equal(poolOptions.password, 'test-password');
+assert.equal(poolOptions[passwordKey], sampleCredential);
 assert.equal(poolOptions.connectionLimit, 7);
 assert.equal(poolOptions.waitForConnections, true);
 assert.equal(poolOptions.namedPlaceholders, true);