diff --git a/proto/api/v1/activity_service.proto b/proto/api/v1/activity_service.proto
index 639224ff0e187..300c20504d24d 100644
--- a/proto/api/v1/activity_service.proto
+++ b/proto/api/v1/activity_service.proto
@@ -21,8 +21,9 @@ message Activity {
   // The name of the activity.
   // Format: activities/{id}
   string name = 1;
-  // The uid of the user who created the activity.
-  int32 creator_id = 2;
+  // The name of the creator.
+  // Format: users/{user}
+  string creator = 2;
   // The type of the activity.
   string type = 3;
   // The level of the activity.
diff --git a/proto/api/v1/webhook_service.proto b/proto/api/v1/webhook_service.proto
index 46e639cd2193a..73e2e9b0f07ad 100644
--- a/proto/api/v1/webhook_service.proto
+++ b/proto/api/v1/webhook_service.proto
@@ -46,7 +46,9 @@ service WebhookService {
 message Webhook {
   int32 id = 1;
 
-  int32 creator_id = 2;
+  // The name of the creator.
+  // Format: users/{user}
+  string creator = 2;
 
   google.protobuf.Timestamp create_time = 3;
 
@@ -68,7 +70,9 @@ message GetWebhookRequest {
 }
 
 message ListWebhooksRequest {
-  int32 creator_id = 1;
+  // The name of the creator.
+  // Format: users/{user}
+  string creator = 2;
 }
 
 message ListWebhooksResponse {
@@ -90,7 +94,9 @@ message WebhookRequestPayload {
 
   string activity_type = 2;
 
-  int32 creator_id = 3;
+  // The name of the creator.
+  // Format: users/{user}
+  string creator = 3;
 
   google.protobuf.Timestamp create_time = 4;
 
diff --git a/proto/gen/api/v1/activity_service.pb.go b/proto/gen/api/v1/activity_service.pb.go
index 55c7d8b077572..cb907dfb01019 100644
--- a/proto/gen/api/v1/activity_service.pb.go
+++ b/proto/gen/api/v1/activity_service.pb.go
@@ -27,8 +27,9 @@ type Activity struct {
 	// The name of the activity.
 	// Format: activities/{id}
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// The uid of the user who created the activity.
-	CreatorId int32 `protobuf:"varint,2,opt,name=creator_id,json=creatorId,proto3" json:"creator_id,omitempty"`
+	// The name of the creator.
+	// Format: users/{user}
+	Creator string `protobuf:"bytes,2,opt,name=creator,proto3" json:"creator,omitempty"`
 	// The type of the activity.
 	Type string `protobuf:"bytes,3,opt,name=type,proto3" json:"type,omitempty"`
 	// The level of the activity.
@@ -78,11 +79,11 @@ func (x *Activity) GetName() string {
 	return ""
 }
 
-func (x *Activity) GetCreatorId() int32 {
+func (x *Activity) GetCreator() string {
 	if x != nil {
-		return x.CreatorId
+		return x.Creator
 	}
-	return 0
+	return ""
 }
 
 func (x *Activity) GetType() string {
@@ -324,65 +325,64 @@ var file_api_v1_activity_service_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/proto/gen/api/v1/webhook_service.pb.go b/proto/gen/api/v1/webhook_service.pb.go
index 7441cb32e85d3..7a7e165131e66 100644
--- a/proto/gen/api/v1/webhook_service.pb.go
+++ b/proto/gen/api/v1/webhook_service.pb.go
@@ -25,9 +25,11 @@ const (
 )
 
 type Webhook struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Id            int32                  `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	CreatorId     int32                  `protobuf:"varint,2,opt,name=creator_id,json=creatorId,proto3" json:"creator_id,omitempty"`
+	state protoimpl.MessageState `protogen:"open.v1"`
+	Id    int32                  `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	// The name of the creator.
+	// Format: users/{user}
+	Creator       string                 `protobuf:"bytes,2,opt,name=creator,proto3" json:"creator,omitempty"`
 	CreateTime    *timestamppb.Timestamp `protobuf:"bytes,3,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
 	UpdateTime    *timestamppb.Timestamp `protobuf:"bytes,4,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
 	Name          string                 `protobuf:"bytes,5,opt,name=name,proto3" json:"name,omitempty"`
@@ -73,11 +75,11 @@ func (x *Webhook) GetId() int32 {
 	return 0
 }
 
-func (x *Webhook) GetCreatorId() int32 {
+func (x *Webhook) GetCreator() string {
 	if x != nil {
-		return x.CreatorId
+		return x.Creator
 	}
-	return 0
+	return ""
 }
 
 func (x *Webhook) GetCreateTime() *timestamppb.Timestamp {
@@ -205,8 +207,10 @@ func (x *GetWebhookRequest) GetId() int32 {
 }
 
 type ListWebhooksRequest struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	CreatorId     int32                  `protobuf:"varint,1,opt,name=creator_id,json=creatorId,proto3" json:"creator_id,omitempty"`
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// The name of the creator.
+	// Format: users/{user}
+	Creator       string `protobuf:"bytes,2,opt,name=creator,proto3" json:"creator,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -241,11 +245,11 @@ func (*ListWebhooksRequest) Descriptor() ([]byte, []int) {
 	return file_api_v1_webhook_service_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *ListWebhooksRequest) GetCreatorId() int32 {
+func (x *ListWebhooksRequest) GetCreator() string {
 	if x != nil {
-		return x.CreatorId
+		return x.Creator
 	}
-	return 0
+	return ""
 }
 
 type ListWebhooksResponse struct {
@@ -389,10 +393,12 @@ func (x *DeleteWebhookRequest) GetId() int32 {
 }
 
 type WebhookRequestPayload struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Url           string                 `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
-	ActivityType  string                 `protobuf:"bytes,2,opt,name=activity_type,json=activityType,proto3" json:"activity_type,omitempty"`
-	CreatorId     int32                  `protobuf:"varint,3,opt,name=creator_id,json=creatorId,proto3" json:"creator_id,omitempty"`
+	state        protoimpl.MessageState `protogen:"open.v1"`
+	Url          string                 `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
+	ActivityType string                 `protobuf:"bytes,2,opt,name=activity_type,json=activityType,proto3" json:"activity_type,omitempty"`
+	// The name of the creator.
+	// Format: users/{user}
+	Creator       string                 `protobuf:"bytes,3,opt,name=creator,proto3" json:"creator,omitempty"`
 	CreateTime    *timestamppb.Timestamp `protobuf:"bytes,4,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
 	Memo          *Memo                  `protobuf:"bytes,5,opt,name=memo,proto3" json:"memo,omitempty"`
 	unknownFields protoimpl.UnknownFields
@@ -443,11 +449,11 @@ func (x *WebhookRequestPayload) GetActivityType() string {
 	return ""
 }
 
-func (x *WebhookRequestPayload) GetCreatorId() int32 {
+func (x *WebhookRequestPayload) GetCreator() string {
 	if x != nil {
-		return x.CreatorId
+		return x.Creator
 	}
-	return 0
+	return ""
 }
 
 func (x *WebhookRequestPayload) GetCreateTime() *timestamppb.Timestamp {
@@ -480,109 +486,108 @@ var file_api_v1_webhook_service_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/proto/gen/apidocs.swagger.yaml b/proto/gen/apidocs.swagger.yaml
index a2cbeac73cbed..19332f3914afb 100644
--- a/proto/gen/apidocs.swagger.yaml
+++ b/proto/gen/apidocs.swagger.yaml
@@ -531,11 +531,13 @@ paths:
           schema:
             $ref: '#/definitions/googlerpcStatus'
       parameters:
-        - name: creatorId
+        - name: creator
+          description: |-
+            The name of the creator.
+            Format: users/{user}
           in: query
           required: false
-          type: integer
-          format: int32
+          type: string
       tags:
         - WebhookService
     post:
@@ -625,9 +627,11 @@ paths:
           schema:
             type: object
             properties:
-              creatorId:
-                type: integer
-                format: int32
+              creator:
+                type: string
+                title: |-
+                  The name of the creator.
+                  Format: users/{user}
               createTime:
                 type: string
                 format: date-time
@@ -2335,10 +2339,11 @@ definitions:
         title: |-
           The name of the activity.
           Format: activities/{id}
-      creatorId:
-        type: integer
-        format: int32
-        description: The uid of the user who created the activity.
+      creator:
+        type: string
+        title: |-
+          The name of the creator.
+          Format: users/{user}
       type:
         type: string
         description: The type of the activity.
@@ -3083,9 +3088,11 @@ definitions:
       id:
         type: integer
         format: int32
-      creatorId:
-        type: integer
-        format: int32
+      creator:
+        type: string
+        title: |-
+          The name of the creator.
+          Format: users/{user}
       createTime:
         type: string
         format: date-time
diff --git a/server/router/api/v1/activity_service.go b/server/router/api/v1/activity_service.go
index a3c0f5b7cd6e4..2f6968d6a8cfa 100644
--- a/server/router/api/v1/activity_service.go
+++ b/server/router/api/v1/activity_service.go
@@ -36,7 +36,7 @@ func (s *APIV1Service) GetActivity(ctx context.Context, request *v1pb.GetActivit
 func (*APIV1Service) convertActivityFromStore(_ context.Context, activity *store.Activity) (*v1pb.Activity, error) {
 	return &v1pb.Activity{
 		Name:       fmt.Sprintf("%s%d", ActivityNamePrefix, activity.ID),
-		CreatorId:  activity.CreatorID,
+		Creator:    fmt.Sprintf("%s%d", UserNamePrefix, activity.CreatorID),
 		Type:       activity.Type.String(),
 		Level:      activity.Level.String(),
 		CreateTime: timestamppb.New(time.Unix(activity.CreatedTs, 0)),
diff --git a/server/router/api/v1/memo_service.go b/server/router/api/v1/memo_service.go
index 0d54515e487f6..ba24a4aca6dec 100644
--- a/server/router/api/v1/memo_service.go
+++ b/server/router/api/v1/memo_service.go
@@ -670,7 +670,7 @@ func convertMemoToWebhookPayload(memo *v1pb.Memo) (*v1pb.WebhookRequestPayload,
 		return nil, errors.Wrap(err, "invalid memo creator")
 	}
 	return &v1pb.WebhookRequestPayload{
-		CreatorId:  creatorID,
+		Creator:    fmt.Sprintf("%s%d", UserNamePrefix, creatorID),
 		CreateTime: timestamppb.New(time.Now()),
 		Memo:       memo,
 	}, nil
diff --git a/server/router/api/v1/webhook_service.go b/server/router/api/v1/webhook_service.go
index 2ebf412d20106..9ea04458de402 100644
--- a/server/router/api/v1/webhook_service.go
+++ b/server/router/api/v1/webhook_service.go
@@ -2,6 +2,7 @@ package v1
 
 import (
 	"context"
+	"fmt"
 	"time"
 
 	"google.golang.org/grpc/codes"
@@ -31,8 +32,13 @@ func (s *APIV1Service) CreateWebhook(ctx context.Context, request *v1pb.CreateWe
 }
 
 func (s *APIV1Service) ListWebhooks(ctx context.Context, request *v1pb.ListWebhooksRequest) (*v1pb.ListWebhooksResponse, error) {
+	creatorID, err := ExtractUserIDFromName(request.Creator)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, "invalid creator name: %v", err)
+	}
+
 	webhooks, err := s.Store.ListWebhooks(ctx, &store.FindWebhook{
-		CreatorID: &request.CreatorId,
+		CreatorID: &creatorID,
 	})
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "failed to list webhooks, error: %+v", err)
@@ -103,7 +109,7 @@ func convertWebhookFromStore(webhook *store.Webhook) *v1pb.Webhook {
 		Id:         webhook.ID,
 		CreateTime: timestamppb.New(time.Unix(webhook.CreatedTs, 0)),
 		UpdateTime: timestamppb.New(time.Unix(webhook.UpdatedTs, 0)),
-		CreatorId:  webhook.CreatorID,
+		Creator:    fmt.Sprintf("%s%d", UserNamePrefix, webhook.CreatorID),
 		Name:       webhook.Name,
 		Url:        webhook.URL,
 	}
diff --git a/web/src/components/Settings/WebhookSection.tsx b/web/src/components/Settings/WebhookSection.tsx
index 92e4e69a54d93..ffa687251849d 100644
--- a/web/src/components/Settings/WebhookSection.tsx
+++ b/web/src/components/Settings/WebhookSection.tsx
@@ -4,14 +4,13 @@ import { useEffect, useState } from "react";
 import { Link } from "react-router-dom";
 import { webhookServiceClient } from "@/grpcweb";
 import useCurrentUser from "@/hooks/useCurrentUser";
-import { extractUserIdFromName } from "@/store/v1";
 import { Webhook } from "@/types/proto/api/v1/webhook_service";
 import { useTranslate } from "@/utils/i18n";
 import showCreateWebhookDialog from "../CreateWebhookDialog";
 
-const listWebhooks = async (userId: number) => {
+const listWebhooks = async (user: string) => {
   const { webhooks } = await webhookServiceClient.listWebhooks({
-    creatorId: userId,
+    creator: user,
   });
   return webhooks;
 };
@@ -22,13 +21,13 @@ const WebhookSection = () => {
   const [webhooks, setWebhooks] = useState<Webhook[]>([]);
 
   useEffect(() => {
-    listWebhooks(extractUserIdFromName(currentUser.name)).then((webhooks) => {
+    listWebhooks(currentUser.name).then((webhooks) => {
       setWebhooks(webhooks);
     });
   }, []);
 
   const handleCreateAccessTokenDialogConfirm = async () => {
-    const webhooks = await listWebhooks(extractUserIdFromName(currentUser.name));
+    const webhooks = await listWebhooks(currentUser.name);
     setWebhooks(webhooks);
   };