diff --git a/frontend/src/views/SetupWizard/DatabaseSetup.vue b/frontend/src/views/SetupWizard/DatabaseSetup.vue
index 3d8bbf7..f4ec3dd 100644
--- a/frontend/src/views/SetupWizard/DatabaseSetup.vue
+++ b/frontend/src/views/SetupWizard/DatabaseSetup.vue
@@ -17,7 +17,12 @@ const emit = defineEmits(["test"]);
     <div class="setup-grid two-columns">
       <label>
         <span>数据库类型</span>
-        <select v-model="form.driver" :disabled="testing">
+        <select
+          id="database-driver"
+          name="database_driver"
+          v-model="form.driver"
+          :disabled="testing"
+        >
           <option value="sqlite">SQLite（本机文件，无需额外服务）</option>
           <option value="mysql">MySQL</option>
           <option value="postgres">PostgreSQL</option>
@@ -26,27 +31,61 @@ const emit = defineEmits(["test"]);
       <template v-if="form.driver !== 'sqlite'">
         <label>
           <span>数据库主机</span>
-          <input v-model.trim="form.host" autocomplete="off" placeholder="db.example.com" />
+          <input
+            id="database-host"
+            name="database_host"
+            v-model.trim="form.host"
+            autocomplete="off"
+            placeholder="db.example.com"
+          />
         </label>
         <label>
           <span>数据库端口</span>
-          <input v-model.number="form.port" type="number" min="1" max="65535" />
+          <input
+            id="database-port"
+            name="database_port"
+            v-model.number="form.port"
+            type="number"
+            min="1"
+            max="65535"
+          />
         </label>
         <label>
           <span>数据库名称</span>
-          <input v-model.trim="form.database" autocomplete="off" />
+          <input
+            id="database-name"
+            name="database_name"
+            v-model.trim="form.database"
+            autocomplete="off"
+          />
         </label>
         <label>
           <span>数据库用户名</span>
-          <input v-model.trim="form.username" autocomplete="off" />
+          <input
+            id="database-username"
+            name="database_username"
+            v-model.trim="form.username"
+            autocomplete="off"
+          />
         </label>
         <label>
           <span>数据库密码</span>
-          <input v-model="form.password" type="password" autocomplete="new-password" />
+          <input
+            id="database-password"
+            name="database_password"
+            v-model="form.password"
+            type="password"
+            autocomplete="new-password"
+          />
         </label>
         <label v-if="form.driver === 'postgres'">
           <span>根证书路径（服务器绝对路径，可选）</span>
-          <input v-model.trim="form.root_certificate" placeholder="使用系统信任库时留空" />
+          <input
+            id="database-root-certificate"
+            name="database_root_certificate"
+            v-model.trim="form.root_certificate"
+            placeholder="使用系统信任库时留空"
+          />
         </label>
       </template>
     </div>
diff --git a/frontend/src/views/SetupWizard/SetupWizard.css b/frontend/src/views/SetupWizard/SetupWizard.css
index 8c73742..f758730 100644
--- a/frontend/src/views/SetupWizard/SetupWizard.css
+++ b/frontend/src/views/SetupWizard/SetupWizard.css
@@ -22,6 +22,22 @@
   gap: 16px;
 }
 
+.warning-card {
+  display: grid;
+  gap: 8px;
+  margin-top: 18px;
+  padding-top: 16px;
+  border-top: 1px solid rgba(255, 255, 255, 0.3);
+  font-size: 12px;
+  line-height: 1.7;
+  letter-spacing: 0;
+  overflow-wrap: anywhere;
+}
+
+.warning-card strong {
+  font-size: 13px;
+}
+
 .setup-eyebrow {
   margin: 0 0 6px;
   color: #4d76b7;
@@ -188,6 +204,7 @@ legend span {
 .setup-grid {
   min-width: 0;
   display: grid;
+  align-items: start;
   gap: 9px 12px;
 }
 
@@ -202,6 +219,7 @@ legend span {
 label {
   min-width: 0;
   display: grid;
+  align-content: start;
   gap: 5px;
   margin-top: 8px;
   color: #34445f;
diff --git a/frontend/src/views/SetupWizard/SetupWizard.js b/frontend/src/views/SetupWizard/SetupWizard.js
index bb75d9e..3178a14 100644
--- a/frontend/src/views/SetupWizard/SetupWizard.js
+++ b/frontend/src/views/SetupWizard/SetupWizard.js
@@ -247,9 +247,9 @@ export function useSetupWizard(props, emit) {
     emailAutofillElement.value.value = String(value || "");
   }
 
-  function handleEmailInput(value) {
+  function handleEmailInput(value, clearError = true) {
     emailVisibleEdited = true;
-    error.value = "";
+    if (clearError) error.value = "";
     const rawValue = String(value || "").trim();
 
     if (!rawValue) {
@@ -314,7 +314,8 @@ export function useSetupWizard(props, emit) {
     if (!rawValue) return;
 
     if (rawValue.includes("@") || rawValue !== emailLocalPart.value) {
-      handleEmailInput(rawValue);
+      // 自动同步不应清除数据库、密码等其他字段的校验结果。
+      handleEmailInput(rawValue, false);
       return;
     }
 
diff --git a/frontend/src/views/SetupWizard/SetupWizard.test.js b/frontend/src/views/SetupWizard/SetupWizard.test.js
index 33022bc..7648342 100644
--- a/frontend/src/views/SetupWizard/SetupWizard.test.js
+++ b/frontend/src/views/SetupWizard/SetupWizard.test.js
@@ -19,6 +19,40 @@ test("已有初始化服务商选择保持兼容", async (t) => {
   assert.equal(state.form.value.dns_provider, "cloudflare");
 });
 
+test("邮箱定时同步不能清除步骤校验错误，手动编辑仍可清除", async (t) => {
+  const { state, runIntervals } = await mountComposable(t,
+    () => useSetupWizard({ status: { mode: "bootstrap" } }, () => {}),
+    async () => Response.json({ items: [aliyunProvider] }));
+  Object.assign(state.form.value, {
+    admin_username: "test-admin",
+    admin_password: "TestPass123",
+    confirm_password: "TestPass123",
+    web_hostname: "scert.example.test",
+  });
+  state.emailInputElement.value = { value: "admin@example.test" };
+  state.emailAutofillElement.value = { value: "" };
+  state.handleEmailInput("admin@example.test");
+  state.handleSubmit();
+  assert.equal(state.error.value, "请先验证所选数据库的连接和写权限。");
+  for (let i = 0; i < 8; i += 1) runIntervals();
+  assert.equal(state.error.value, "请先验证所选数据库的连接和写权限。");
+  assert.equal(state.currentStep.value, 1);
+  state.handleEmailInput("changed@example.test");
+  assert.equal(state.error.value, "");
+});
+
+test("自动填充同步新邮箱时保留其他字段的错误", async (t) => {
+  const { state, runIntervals } = await mountComposable(t,
+    () => useSetupWizard({ status: {} }, () => {}),
+    async () => Response.json({ items: [aliyunProvider] }));
+  state.emailInputElement.value = { value: "" };
+  state.emailAutofillElement.value = { value: "autofill@example.test" };
+  state.error.value = "两次输入的超级管理员密码不一致。";
+  runIntervals();
+  assert.equal(state.form.value.admin_email, "autofill@example.test");
+  assert.equal(state.error.value, "两次输入的超级管理员密码不一致。");
+});
+
 async function setup(t, request) {
   const mounted = await mountComposable(t, () => useSetupWizard({ status: { dns_provider: "aliyun" } }, () => {}),
     async (path) => path.endsWith("/providers") ? Response.json({ items: [aliyunProvider] }) : request());