diff --git a/src/request-management/request-management.service.ts b/src/request-management/request-management.service.ts
index bcb4bef..a4b8168 100644
--- a/src/request-management/request-management.service.ts
+++ b/src/request-management/request-management.service.ts
@@ -47,6 +47,7 @@ import { ReqBlameStatus } from "src/Types&Enums/blame-request-management/status.
 import { StepsEnum } from "src/Types&Enums/blame-request-management/steps.enum";
 import { ExpertDbService } from "src/users/entities/db-service/expert.db.service";
 import { UserDbService } from "src/users/entities/db-service/user.db.service";
+import { isOtpExpiryActive } from "src/helpers/user-otp-expiry";
 import { parseIranLocalDateTime } from "src/helpers/iran-datetime";
 import { applyListQueryV2 } from "src/helpers/list-query-v2";
 import { ListQueryV2Dto } from "src/common/dto/list-query-v2.dto";
@@ -4735,6 +4736,7 @@ export class RequestManagementService {
     const phone = (dto?.phoneNumber || "").trim();
     if (!phone) throw new BadRequestException("phoneNumber is required");
 
+    // --- Cooldown guard (in-memory history, catches already-persisted sends) ---
     const twoMinutesAgo = new Date(Date.now() - 2 * 60 * 1000);
     const recentlySentToPhone = (req.history || [])
       .slice()
@@ -4752,6 +4754,20 @@ export class RequestManagementService {
       );
     }
 
+    // --- DB-level cooldown guard (catches burst/concurrent requests before history is saved) ---
+    // Read the user's otpExpire directly from the users collection. If a live
+    // OTP already exists we return 400 immediately — no SMS call, no DB writes.
+    const canonicalPhone =
+      normalizeIranMobile(phone) ?? phone;
+    const existingUser = await this.userDbService.findOne(
+      buildUserLookupByPhone(canonicalPhone),
+    );
+    if (existingUser && isOtpExpiryActive(existingUser.otpExpire)) {
+      throw new BadRequestException(
+        `(${phone}): OTP was sent recently. Please wait before requesting again.`,
+      );
+    }
+
     try {
       await this.userAuthService.sendOtpRequest(phone);
     } catch (e: any) {