diff --git a/src/main/java/com/yunhai/platform/gateway/route/RouteChangeBroadcaster.java b/src/main/java/com/yunhai/platform/gateway/route/RouteChangeBroadcaster.java
index 7d44f2f..b5a0374 100644
--- a/src/main/java/com/yunhai/platform/gateway/route/RouteChangeBroadcaster.java
+++ b/src/main/java/com/yunhai/platform/gateway/route/RouteChangeBroadcaster.java
@@ -4,10 +4,10 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.data.redis.connection.Message;
 import org.springframework.data.redis.connection.MessageListener;
-import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.data.redis.listener.ChannelTopic;
 import org.springframework.data.redis.listener.RedisMessageListenerContainer;
@@ -41,19 +41,26 @@ public class RouteChangeBroadcaster implements MessageListener, DisposableBean {
     @Autowired
     private RouteRegistry routeRegistry;
 
+    /**
+     * 广播通道走<b>应用主库</b>模板（bean 名 {@code stringRedisTemplate}），而非 appauth starter 的
+     * 密钥专用 {@code signKeyStringRedisTemplate}（那个直连 db0 专供 {@code sign:app:*}）。
+     * 两者同类型，不显式 {@code @Qualifier} 会因注入歧义启动失败；选错则发布与订阅落在不同 db，
+     * 广播静默失效（比启动失败更糟——看不出问题）。
+     */
     @Autowired
+    @Qualifier("stringRedisTemplate")
     private StringRedisTemplate redisTemplate;
 
-    @Autowired
-    private RedisConnectionFactory connectionFactory;
-
     private RedisMessageListenerContainer container;
 
     @PostConstruct
     void subscribe() {
         try {
             RedisMessageListenerContainer c = new RedisMessageListenerContainer();
-            c.setConnectionFactory(connectionFactory);
+            // 订阅连接直接取用上面 template 的连接工厂，保证「发布」与「订阅」必然同库：
+            // 另注一个 RedisConnectionFactory 会引入同类型多 bean 歧义，且可能被解析到
+            // appauth 的 db0 工厂上与主库模板不匹配。
+            c.setConnectionFactory(redisTemplate.getConnectionFactory());
             c.addMessageListener(this, new ChannelTopic(CHANNEL));
             c.afterPropertiesSet(); // 连接不可用时异步重连，不阻塞启动
             container = c;
diff --git a/src/test/java/com/yunhai/platform/gateway/route/RouteChangeBroadcasterWiringTest.java b/src/test/java/com/yunhai/platform/gateway/route/RouteChangeBroadcasterWiringTest.java
new file mode 100644
index 0000000..2b37519
--- /dev/null
+++ b/src/test/java/com/yunhai/platform/gateway/route/RouteChangeBroadcasterWiringTest.java
@@ -0,0 +1,102 @@
+package com.yunhai.platform.gateway.route;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;
+import org.springframework.beans.factory.annotation.QualifierAnnotationAutowireCandidateResolver;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.StringRedisTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.mock;
+
+/**
+ * 回归测试（2026-09-24 线上事故）：{@link RouteChangeBroadcaster} 的 Redis 注入必须显式选主库模板，
+ * 且必须能容忍「两个同类型 StringRedisTemplate 共存」的上下文。
+ * <p>
+ * <b>事故</b>：{@code yh-appauth} 的 {@code SignKeyRedisAutoConfiguration} 注册了同名类型的
+ * {@code signKeyStringRedisTemplate}（直连 db0，专供 {@code sign:app:*}）。本类原先裸
+ * {@code @Autowired StringRedisTemplate} → {@code NoUniqueBeanDefinitionException} →
+ * 网关启动即失败、容器无限重启（RestartCount=11）。
+ * <p>
+ * <b>既有测试为何漏掉</b>：测试 profile 一律 {@code yh.gateway.redis-broadcast-enabled=false}
+ * 把本类整个关掉，装配分支从未被触碰。
+ * <p>
+ * <b>为什么不用 @SpringBootTest</b>：需要一个<i>恰好只有这两个模板</i>的最小 bean 集合来复现歧义，
+ * 全量上下文会被组件扫描、数据源等噪声干扰。这里手工驱动
+ * {@link AutowiredAnnotationBeanPostProcessor}——它与生产环境用的是同一套注入逻辑，
+ * 因此能真实复现「裸 @Autowired 会炸」这一行为。
+ */
+class RouteChangeBroadcasterWiringTest {
+
+    /** appauth starter 密钥模板的 bean 名（与 SignKeyRedisAutoConfiguration.SIGN_TEMPLATE_BEAN 一致） */
+    private static final String SIGN_TEMPLATE_BEAN = "signKeyStringRedisTemplate";
+
+    private static final String MAIN_TEMPLATE_BEAN = "stringRedisTemplate";
+
+    /** 复现环境：注册两个同类型模板 + 一个 RouteRegistry */
+    private DefaultListableBeanFactory twoTemplatesFactory() {
+        DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
+        factory.setAutowireCandidateResolver(new QualifierAnnotationAutowireCandidateResolver());
+        factory.registerSingleton(MAIN_TEMPLATE_BEAN,
+                new StringRedisTemplate(mock(RedisConnectionFactory.class)));
+        factory.registerSingleton(SIGN_TEMPLATE_BEAN,
+                new StringRedisTemplate(mock(RedisConnectionFactory.class)));
+        factory.registerSingleton("routeRegistry", mock(RouteRegistry.class));
+        return factory;
+    }
+
+    /** 用生产同款注入逻辑装配一个 RouteChangeBroadcaster 实例 */
+    private RouteChangeBroadcaster build(DefaultListableBeanFactory factory) {
+        RootBeanDefinition def = new RootBeanDefinition(RouteChangeBroadcaster.class);
+        factory.registerBeanDefinition("routeChangeBroadcaster", def);
+        AutowiredAnnotationBeanPostProcessor processor = new AutowiredAnnotationBeanPostProcessor();
+        processor.setBeanFactory(factory);
+        RouteChangeBroadcaster bean = new RouteChangeBroadcaster();
+        processor.postProcessProperties(null, bean, "routeChangeBroadcaster");
+        return bean;
+    }
+
+    @Test
+    void 两个同类型模板共存时_广播器仍可装配() {
+        RouteChangeBroadcaster bean = build(twoTemplatesFactory());
+        assertThat(bean)
+                .as("stringRedisTemplate 与 signKeyStringRedisTemplate 共存时广播器必须装配成功")
+                .isNotNull();
+    }
+
+    @Test
+    void 广播器绑定主库模板而非密钥专用模板() {
+        DefaultListableBeanFactory factory = twoTemplatesFactory();
+        RouteChangeBroadcaster bean = build(factory);
+        StringRedisTemplate bound = (StringRedisTemplate) org.springframework.test.util.ReflectionTestUtils
+                .getField(bean, "redisTemplate");
+        assertThat(bound)
+                .as("必须绑定应用主库的 stringRedisTemplate（选错 = 发布订阅异库、广播静默失效）")
+                .isSameAs(factory.getBean(MAIN_TEMPLATE_BEAN, StringRedisTemplate.class));
+    }
+
+    /**
+     * 反向保护：钉死「裸 @Autowired 确实会失败」这一事实，防止有人误以为本测试是多余的。
+     * 若哪天歧义被 Spring 默认策略自动消解（例如某方加了 @Primary），本用例会失败并提醒复核。
+     */
+    @Test
+    void 无Qualifier时同类型双Bean必然注入歧义() {
+        DefaultListableBeanFactory factory = twoTemplatesFactory();
+        factory.registerBeanDefinition("bareBroadcaster", new RootBeanDefinition(BareInjectProbe.class));
+        AutowiredAnnotationBeanPostProcessor processor = new AutowiredAnnotationBeanPostProcessor();
+        processor.setBeanFactory(factory);
+        BareInjectProbe probe = new BareInjectProbe();
+        assertThatThrownBy(() -> processor.postProcessProperties(null, probe, "bareBroadcaster"))
+                .as("两个同类型模板下裸 @Autowired 必须失败——这正是事故成因")
+                .isInstanceOf(org.springframework.beans.factory.UnsatisfiedDependencyException.class);
+    }
+
+    /** 与 RouteChangeBroadcaster 改前同形的裸注入探针，仅用于反向断言 */
+    static class BareInjectProbe {
+        @org.springframework.beans.factory.annotation.Autowired
+        private StringRedisTemplate redisTemplate;
+    }
+}