diff --git a/src/main/java/com/petstore/controller/ReportLeadController.java b/src/main/java/com/petstore/controller/ReportLeadController.java
index 833eff0..eb1aef3 100644
--- a/src/main/java/com/petstore/controller/ReportLeadController.java
+++ b/src/main/java/com/petstore/controller/ReportLeadController.java
@@ -55,7 +55,11 @@ public class ReportLeadController {
             data.put("unsubscribeToken", lead.getUnsubscribeToken());
             data.put("wechatBound", outcome.wechatBound());
             data.put("repeatSubmit", outcome.repeatSubmit());
-            return Map.of("code", 200, "data", data);
+            data.put("alreadySubmitted", outcome.repeatSubmit());
+            String message = outcome.repeatSubmit()
+                    ? "该手机号已登记过本报告的提醒，信息已更新"
+                    : "提交成功";
+            return Map.of("code", 200, "message", message, "data", data);
         } catch (IllegalArgumentException e) {
             return Map.of("code", 400, "message", e.getMessage());
         }
diff --git a/src/main/java/com/petstore/entity/ReportLead.java b/src/main/java/com/petstore/entity/ReportLead.java
index 5619bfe..6d89d07 100644
--- a/src/main/java/com/petstore/entity/ReportLead.java
+++ b/src/main/java/com/petstore/entity/ReportLead.java
@@ -8,12 +8,17 @@ import java.time.LocalDateTime;
 
 /**
  * 宠主在报告页留下的联系方式 + 下次服务提醒。
- * 一约可多条（宠主可以改手机号重新留资），status 用于软退订与去重。
+ * 同一报告下同一手机号仅一条（数据库唯一约束）；换手机号可再留一条。
+ * remind_status 等用于软退订与发送状态。
  */
 @Data
 @Entity
 @Table(
         name = "t_report_lead",
+        uniqueConstraints = @UniqueConstraint(
+                name = "uk_lead_report_phone",
+                columnNames = {"report_id", "phone"}
+        ),
         indexes = {
                 @Index(name = "idx_lead_report_id", columnList = "report_id"),
                 @Index(name = "idx_lead_store_status_remind", columnList = "store_id,remind_status,remind_date"),
diff --git a/src/main/java/com/petstore/service/ReportLeadService.java b/src/main/java/com/petstore/service/ReportLeadService.java
index 84800fd..cdfe760 100644
--- a/src/main/java/com/petstore/service/ReportLeadService.java
+++ b/src/main/java/com/petstore/service/ReportLeadService.java
@@ -10,6 +10,7 @@ import com.petstore.mapper.ServiceIntervalMapper;
 import com.petstore.mapper.UserMapper;
 import jakarta.annotation.PostConstruct;
 import lombok.RequiredArgsConstructor;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDate;
@@ -128,6 +129,7 @@ public class ReportLeadService {
         LocalDateTime now = LocalDateTime.now();
         ReportLead lead = reportLeadMapper.findFirstByReportIdAndPhone(report.getId(), phone).orElse(null);
         boolean repeatSubmit = lead != null;
+        final boolean insertingNew = lead == null;
         if (lead == null) {
             lead = new ReportLead();
             lead.setReportId(report.getId());
@@ -170,7 +172,32 @@ public class ReportLeadService {
             lead.setWechatUnionid(uid);
         }
 
-        lead = reportLeadMapper.save(lead);
+        try {
+            lead = reportLeadMapper.save(lead);
+        } catch (DataIntegrityViolationException ex) {
+            if (!insertingNew) {
+                throw ex;
+            }
+            ReportLead existing = reportLeadMapper.findFirstByReportIdAndPhone(report.getId(), phone).orElse(null);
+            if (existing == null) {
+                throw ex;
+            }
+            lead = existing;
+            repeatSubmit = true;
+            lead.setReminderType(reminderType);
+            lead.setRemindDate(remindDate);
+            lead.setRemindStatus("pending");
+            lead.setConsentAt(now);
+            lead.setConsentIp(consentIp);
+            lead.setUpdateTime(now);
+            if (oid != null && !oid.isBlank()) {
+                lead.setWechatOpenid(oid);
+            }
+            if (uid != null && !uid.isBlank()) {
+                lead.setWechatUnionid(uid);
+            }
+            lead = reportLeadMapper.save(lead);
+        }
 
         boolean wechatBound = false;
         if (oid != null && !oid.isBlank()) {