diff --git a/src/main/java/deepple/deepple/member/command/infra/member/sms/BizgoMessanger.java b/src/main/java/deepple/deepple/member/command/infra/member/sms/BizgoMessanger.java
index b6138f0e..bfb9becb 100644
--- a/src/main/java/deepple/deepple/member/command/infra/member/sms/BizgoMessanger.java
+++ b/src/main/java/deepple/deepple/member/command/infra/member/sms/BizgoMessanger.java
@@ -44,6 +44,9 @@ private void sendRequest(String message, String phoneNumber) {
             .body(new BizgoMessageRequest(message, fromPhoneNumber, phoneNumber))
             .retrieve()
             .onStatus(HttpStatusCode::isError, (request, httpResponse) -> {
+                    String responseBody = new String(httpResponse.getBody().readAllBytes());
+                    log.error("Bizgo API 에러 응답 - statusCode: {}, body: {}",
+                        httpResponse.getStatusCode().value(), responseBody);
                     throw new BizgoMessageSendException(httpResponse.getStatusCode().value());
                 }
             ).toEntity(String.class);
diff --git a/src/main/java/deepple/deepple/notification/command/domain/Notification.java b/src/main/java/deepple/deepple/notification/command/domain/Notification.java
index 6fce7159..d8b784cb 100644
--- a/src/main/java/deepple/deepple/notification/command/domain/Notification.java
+++ b/src/main/java/deepple/deepple/notification/command/domain/Notification.java
@@ -12,7 +12,10 @@
 import static jakarta.persistence.EnumType.STRING;
 
 @Entity
-@Table(name = "notifications")
+@Table(
+    name = "notifications",
+    indexes = @Index(name = "idx_notifications_receiver_deleted_id", columnList = "receiverId, deletedAt, id")
+)
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @Getter
 public class Notification extends SoftDeleteBaseEntity {
diff --git a/src/main/resources/db/migration/V7__add_index_to_notifications.sql b/src/main/resources/db/migration/V7__add_index_to_notifications.sql
new file mode 100644
index 00000000..4ce5320f
--- /dev/null
+++ b/src/main/resources/db/migration/V7__add_index_to_notifications.sql
@@ -0,0 +1,2 @@
+CREATE INDEX idx_notifications_receiver_deleted_id
+    ON notifications (receiver_id, deleted_at, id);
\ No newline at end of file