diff --git a/Back/core/deps.py b/Back/core/deps.py
index 9f3048d..a0e3a5c 100644
--- a/Back/core/deps.py
+++ b/Back/core/deps.py
@@ -26,7 +26,7 @@ async def get_current_user(
     if payload is None:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid authentication token",
+            detail="توکن نامعتبر است",
         )
 
     user_id = payload.get("sub")
@@ -34,7 +34,7 @@ async def get_current_user(
     if not user_id:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid token payload",
+            detail="توکن نامعتبر است",
         )
 
     user = await get_user_by_id(db, user_id)
@@ -42,13 +42,13 @@ async def get_current_user(
     if not user:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="User not found",
+            detail="کاربری یافت نشد",
         )
 
     if not user.is_active:
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,
-            detail="User is inactive",
+            detail="کاربر غیرفعال است",
         )
 
     # Check token version for remote logout
@@ -56,7 +56,7 @@ async def get_current_user(
     if token_version != user.token_version:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Token has been invalidated",
+            detail="توکن نامعتبر است",
         )
 
     return user
@@ -72,7 +72,7 @@ async def get_current_admin(
     if not user.is_admin:
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,
-            detail="Admin privileges required",
+            detail="شما دسترسی لازم را ندارید",
         )
 
     return user
\ No newline at end of file
diff --git a/Back/core/rate_limit.py b/Back/core/rate_limit.py
new file mode 100644
index 0000000..cb483c0
--- /dev/null
+++ b/Back/core/rate_limit.py
@@ -0,0 +1,50 @@
+# core/rate_limit.py
+
+from fastapi import Request, HTTPException, status
+from db.redis import redis_client
+
+class RateLimiter:
+    def __init__(self, requests: int, window_seconds: int, scope: str = "global"):
+        """
+        :param requests: number of requests allowed
+        :param window_seconds: window time in seconds
+        :param scope: type of limit ("global" for all site, "endpoint" for a specific path)
+        """
+        self.requests = requests
+        self.window_seconds = window_seconds
+        self.scope = scope
+
+    async def __call__(self, request: Request):
+        # getting client ip
+        client_ip = request.client.host if request.client else "127.0.0.1"
+        
+        # when project is in docker and behind nginx, the real ip is in the headers
+        real_ip = request.headers.get("x-real-ip", request.headers.get("x-forwarded-for", client_ip))
+        # if there are multiple ips, take the first ip (the real user ip)
+        real_ip = real_ip.split(",")[0].strip()
+
+        # creating redis key based on scope
+        if self.scope == "global":
+            # key for global limit (e.g., rate_limit:global:192.168.1.5)
+            key = f"rate_limit:global:{real_ip}"
+        else:
+            # key for endpoint limit (e.g., rate_limit:endpoint:192.168.1.5:/admin/login)
+            path = request.scope["path"]
+            key = f"rate_limit:endpoint:{real_ip}:{path}"
+
+        # adding 1 to the number of requests for this ip in redis
+        current_count = await redis_client.incr(key)
+
+        # if this is the first request in this time window, set the expiration time (TTL)
+        if current_count == 1:
+            await redis_client.expire(key, self.window_seconds)
+
+        # if the number of requests exceeds the limit, access is blocked
+        if current_count > self.requests:
+            # penalty: if someone spams, the time they are blocked is extended from zero again
+            await redis_client.expire(key, self.window_seconds)
+            
+            raise HTTPException(
+                status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+                detail="Too many requests. Please try again later."
+            )
\ No newline at end of file
diff --git a/Back/domains/admin/api.py b/Back/domains/admin/api.py
index 6a4a4c0..c182ddf 100644
--- a/Back/domains/admin/api.py
+++ b/Back/domains/admin/api.py
@@ -68,9 +68,9 @@ async def logout_user(
     if not user:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
-            detail="User not found"
+            detail="نام‌ کاربری یافت نشد"
         )
-    return {"message": "User logged out successfully"}
+    return {"message": "خروج کاربر با موفقیت انجام شد"}
 
 
 @router.post("/users/{user_id}/reset-secret",
@@ -89,7 +89,7 @@ async def reset_secret(
     if not new_secret:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
-            detail="User not found"
+            detail="نام کاربری یافت نشد"
         )
 
     return {"secret": new_secret}
diff --git a/Back/domains/admin/schemas.py b/Back/domains/admin/schemas.py
index 77c93ee..c9893a7 100644
--- a/Back/domains/admin/schemas.py
+++ b/Back/domains/admin/schemas.py
@@ -1,24 +1,50 @@
+from typing import Required
 import uuid
-from pydantic import BaseModel, ConfigDict
+from pydantic import BaseModel, ConfigDict, Field, field_validator, StrictBool
 
 class AdminCreateUser(BaseModel):
     model_config = ConfigDict(extra="forbid")
-    username: str
-    phone_number: str | None = None
+    username: str = Field(..., max_length=20, description='username of the user')
+    phone_number: str | None = Field(None, max_length=11, description='phone number of user')
+    
+    # validate phone number
+    @field_validator('phone_number')
+    def validate_phone_number(cls, v: str | None) -> str | None:
+        if v is None:
+            return None
+        if not v.isdigit():
+            raise ValueError('شماره تلفن باید عدد باشد')
+        if len(v) != 11:
+            raise ValueError('شماره تلفن باید 11 رقم باشد')
+        if not v.startswith('09'):
+            raise ValueError('شماره تلفن باید با 09 شروع شود')
+        return v
 
 class AdminUserResponse(BaseModel):
-    id: uuid.UUID
-    username: str
-    phone_number: str | None
-    is_admin: bool
-    is_active: bool
+    id: uuid.UUID = Field(...)
+    username: str = Field(..., max_length=20, description='username of the user')
+    phone_number: str | None = Field(..., description='phone number of user')
+    is_admin: bool = Field(..., description='is admin')
+    is_active: bool = Field(..., description='is active')
+    
+    @field_validator('phone_number')
+    def validate_phone_number(cls, v: str | None) -> str | None:
+        if v is None:
+            return None
+        if not v.isdigit():
+            raise ValueError('شماره تلفن باید عدد باشد')
+        if len(v) != 11:
+            raise ValueError('شماره تلفن باید 11 رقم باشد')
+        if not v.startswith('09'):
+            raise ValueError('شماره تلفن باید با 09 شروع شود')
+        return v
 
     class Config:
         from_attributes = True
 
 class AdminCreateUserResult(BaseModel):
-    user: AdminUserResponse
-    secret: str
+    user: AdminUserResponse = Field(...)
+    secret: str = Field(...)
 
 class AdminResetSecretResult(BaseModel):
-    secret: str
+    secret: str = Field(...)
diff --git a/Back/domains/admin/service.py b/Back/domains/admin/service.py
index e5980c4..9f21e73 100644
--- a/Back/domains/admin/service.py
+++ b/Back/domains/admin/service.py
@@ -41,7 +41,7 @@ async def _create_user_with_role(
     existing = await get_user_by_username(db, username)
 
     if existing:
-        raise ValueError("Username already exists")
+        raise ValueError("نام کاربری تکراری است")
 
     secret = generate_user_secret()
 
diff --git a/Back/domains/auth/api.py b/Back/domains/auth/api.py
index c3322ee..1075048 100644
--- a/Back/domains/auth/api.py
+++ b/Back/domains/auth/api.py
@@ -1,8 +1,10 @@
+import uuid
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from db.session import get_db
 from core.jwt import decode_token, create_access_token
+from core.rate_limit import RateLimiter
 from domains.users.repo import get_user_by_id
 
 from domains.auth.schemas import (
@@ -12,15 +14,14 @@ from domains.auth.schemas import (
 )
 
 from domains.auth.service import login_user
-import uuid
 
 router = APIRouter(
     prefix="/auth",
     tags=["auth"]
 )
 
-
-@router.post("/login", response_model=TokenResponse)
+login_limiter = RateLimiter(requests=5, window_seconds=60, scope="endpoint")
+@router.post("/login", response_model=TokenResponse, dependencies=[Depends(login_limiter)])
 async def login(
     payload: LoginRequest,
     db: AsyncSession = Depends(get_db)
@@ -35,7 +36,7 @@ async def login(
     if not token:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid username or secret"
+            detail="نام کاربری یا رمز عبور اشتباه است"
         )
 
     return token
@@ -49,7 +50,7 @@ async def refresh(
     if not payload_data or payload_data.get("type") != "refresh":
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid refresh token",
+            detail="رفرش توکن نامعتبر است",
         )
 
     user_id = payload_data.get("sub")
@@ -58,7 +59,7 @@ async def refresh(
     if not user_id or token_version is None:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid refresh token payload",
+            detail="پیلود رفرش توکن نامعتبر است",
         )
 
     try:
@@ -66,7 +67,7 @@ async def refresh(
     except ValueError:
        raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid user ID in token",
+            detail="شناسه کاربر نامعتبر است",
         )
 
     user = await get_user_by_id(db, user_uuid)
@@ -74,7 +75,7 @@ async def refresh(
     if not user or not user.is_active or user.token_version != token_version:
          raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid refresh token",
+            detail="رفرش توکن نامعتبر است",
         )
 
     access_token = create_access_token(
diff --git a/Back/domains/auth/schemas.py b/Back/domains/auth/schemas.py
index f8ab536..c8c13ab 100644
--- a/Back/domains/auth/schemas.py
+++ b/Back/domains/auth/schemas.py
@@ -1,25 +1,25 @@
 import uuid
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 
 class LoginRequest(BaseModel):
-    username: str
-    secret: str
+    username: str = Field(..., description='username of the user')
+    secret: str = Field(..., description='secret of the user')
 
 
 class TokenResponse(BaseModel):
-    access_token: str
-    refresh_token: str
-    token_type: str = "bearer"
+    access_token: str = Field(..., description='access token')
+    refresh_token: str = Field(..., description='refresh token')
+    token_type: str = Field("bearer", description='token type')
 
 class RefreshTokenRequest(BaseModel):
-    refresh_token: str
+    refresh_token: str = Field(..., description='refresh token')
 
 
 class AuthUser(BaseModel):
-    id: uuid.UUID
-    username: str
-    is_admin: bool
+    id: uuid.UUID = Field(..., description='user id')
+    username: str = Field(..., description='username of the user')
+    is_admin: bool = Field(..., description='is admin')
 
     class Config:
         from_attributes = True
\ No newline at end of file
diff --git a/Back/domains/groups/api.py b/Back/domains/groups/api.py
index be8b8a2..35f51d8 100644
--- a/Back/domains/groups/api.py
+++ b/Back/domains/groups/api.py
@@ -100,7 +100,7 @@ async def invite_member(
             user.id,
             payload.username
         )
-        return {"message": "Invitation sent", "notification_id": notification.id}
+        return {"message": "دعوت ارسال شد", "notification_id": notification.id}
     except ValueError as e:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
@@ -125,7 +125,7 @@ async def remove_member(
             user_id,
             user
         )
-        return {"message": "Member removed successfully"}
+        return {"message": "عضو با موفقیت حذف شد"}
     except ValueError as e:
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,
diff --git a/Back/domains/groups/schemas.py b/Back/domains/groups/schemas.py
index b68cdfe..ae14e36 100644
--- a/Back/domains/groups/schemas.py
+++ b/Back/domains/groups/schemas.py
@@ -1,28 +1,28 @@
 import uuid
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 from domains.groups.models import GroupType, GroupMemberRole
 
 class GroupCreate(BaseModel):
-    name: str
+    name: str = Field(..., max_length=50, description='name of the group')
 
 class GroupResponse(BaseModel):
-    id: uuid.UUID
-    name: str
-    type: GroupType
-    is_active: bool
+    id: uuid.UUID = Field(...)
+    name: str = Field(..., max_length=50, description='name of the group')
+    type: GroupType = Field(..., description='type of the group')
+    is_active: bool = Field(..., description='is active')
 
     class Config:
         from_attributes = True
 
 class AddMemberRequest(BaseModel):
-    username: str # Req 12 says user enters username
+    username: str = Field(..., max_length=20, description='username of the user')
 
 class GroupMemberResponse(BaseModel):
-    user_id: uuid.UUID
-    username: str
-    role: GroupMemberRole
-    is_online: bool = False
+    user_id: uuid.UUID = Field(...)
+    username: str = Field(..., max_length=20, description='username of the user')
+    role: GroupMemberRole = Field(..., description='role of the user in the group')
+    is_online: bool = Field(False, description='is online')
 
     class Config:
         from_attributes = True
\ No newline at end of file
diff --git a/Back/domains/groups/service.py b/Back/domains/groups/service.py
index a165e0c..5562d45 100644
--- a/Back/domains/groups/service.py
+++ b/Back/domains/groups/service.py
@@ -15,7 +15,8 @@ from domains.groups.repo import (
     get_all_groups as repo_get_all_groups
 )
 from domains.realtime.presence_service import list_online_users
-
+from domains.users.repo import get_user_by_username
+from domains.notifications.service import send_join_request
 
 async def create_new_group(
     db: AsyncSession,
@@ -49,29 +50,28 @@ async def invite_member_to_group(
     sender_id: uuid.UUID,
     target_username: str
 ):
-    from domains.users.repo import get_user_by_username
-    from domains.notifications.service import send_join_request
+    
 
     group_id_uuid = group_id if isinstance(group_id, uuid.UUID) else uuid.UUID(group_id)
 
     # 1. Check if group exists
     group = await get_group_by_id(db, group_id_uuid)
     if not group:
-        raise ValueError("Group not found")
+        raise ValueError("گروهی یافت نشد")
 
     sender = await get_user_by_id(db, sender_id)
     if not sender:
-        raise ValueError("Sender not found")
+        raise ValueError("فرستنده یافت نشد")
 
     if not sender.is_admin:
         membership = await get_group_member(db, group_id_uuid, sender_id)
         if not membership:
-            raise ValueError("Not a group member")
+            raise ValueError("شما عضو این گروه نیستید")
 
     # 2. Check if target user exists
     target_user = await get_user_by_username(db, target_username)
     if not target_user:
-        raise ValueError("User not found")
+        raise ValueError("کاربری یافت نشد")
 
     # 3. Send notification (Req 12)
     return await send_join_request(
@@ -79,8 +79,8 @@ async def invite_member_to_group(
         sender_id=sender_id,
         receiver_id=target_user.id,
         group_id=group.id,
-        title="Group Invitation",
-        description=f"You have been invited to join group {group.name}"
+        title="دعوت به گروه",
+        description=f"شما به گروه {group.name} دعوت شده‌اید"
     )
 
 
@@ -95,7 +95,7 @@ async def add_member_to_group(
 
     existing = await get_group_member(db, group_id_uuid, user_id_uuid)
     if existing:
-        raise ValueError("User already in group")
+        raise ValueError("کاربر از قبل عضو گروه است")
 
     membership = GroupMember(
         group_id=group_id_uuid,
@@ -146,6 +146,6 @@ async def remove_member_from_group(
     if not requesting_user.is_admin:
         membership = await get_group_member(db, group_id_uuid, requesting_user.id)
         if not membership or membership.role != GroupMemberRole.MANAGER:
-            raise ValueError("Permission denied")
+            raise ValueError("دسترسی لازم را ندارید")
 
     await delete_group_member(db, group_id_uuid, target_user_id_uuid)
diff --git a/Back/domains/notifications/schemas.py b/Back/domains/notifications/schemas.py
index 1f81efc..b4d0d2a 100644
--- a/Back/domains/notifications/schemas.py
+++ b/Back/domains/notifications/schemas.py
@@ -1,25 +1,26 @@
 import uuid
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
+
 from domains.notifications.models import NotificationType
 
 class NotificationBase(BaseModel):
-    title: str
-    description: str | None = None
-    type: NotificationType
-    group_id: uuid.UUID | None = None
+    title: str = Field(..., description='title of the notification')
+    description: str | None = Field(None, description='description of the notification')
+    type: NotificationType = Field(..., description='type of the notification')
+    group_id: uuid.UUID | None = Field(None, description='group id of the notification')
 
 class NotificationCreate(NotificationBase):
-    receiver_id: uuid.UUID
-    sender_id: uuid.UUID | None = None
+    receiver_id: uuid.UUID = Field(..., description='receiver id of the notification')
+    sender_id: uuid.UUID | None = Field(None, description='sender id of the notification')
 
 class NotificationResponse(NotificationBase):
-    id: uuid.UUID
-    is_accepted: bool | None
-    receiver_id: uuid.UUID
-    sender_id: uuid.UUID | None
+    id: uuid.UUID = Field(..., description='notification id')
+    is_accepted: bool | None = Field(..., description='is accepted')
+    receiver_id: uuid.UUID = Field(..., description='receiver id of the notification')
+    sender_id: uuid.UUID | None = Field(..., description='sender id of the notification')
     
     class Config:
         from_attributes = True
 
 class NotificationAction(BaseModel):
-    is_accepted: bool
+    is_accepted: bool = Field(..., description='is accepted')
diff --git a/Back/domains/notifications/service.py b/Back/domains/notifications/service.py
index 32b215e..635f639 100644
--- a/Back/domains/notifications/service.py
+++ b/Back/domains/notifications/service.py
@@ -62,10 +62,10 @@ async def respond_to_notification(
     notification_id_uuid = notification_id if isinstance(notification_id, uuid.UUID) else uuid.UUID(notification_id)
     notification = await get_notification_by_id(db, notification_id_uuid)
     if not notification:
-        raise ValueError("Notification not found")
+        raise ValueError("نوتیفیکیشنی یافت نشد")
     
     if str(notification.receiver_id) != str(user_id):
-        raise ValueError("Permission denied")
+        raise ValueError("دسترسی لازم را ندارید")
     
     notification.is_accepted = is_accepted
     await update_notification(db, notification)
diff --git a/Back/domains/realtime/speaker_service.py b/Back/domains/realtime/speaker_service.py
index ae667a6..997905d 100644
--- a/Back/domains/realtime/speaker_service.py
+++ b/Back/domains/realtime/speaker_service.py
@@ -13,17 +13,10 @@ from domains.groups.repo import get_group_by_id
 async def request_speak(
     group_id: str | uuid.UUID,
     user_id: str | uuid.UUID,
-    group_type: str
 ) -> bool:
     group_id_str = str(group_id)
     user_id_str = str(user_id)
 
-
-    if group_type == "private":
-        await grant_publish_permission(group_id_str, user_id_str, True)
-        return True
-
-    # group chat → push-to-talk
     granted = await acquire_speaker(group_id_str, user_id_str)
     if not granted:
         return False
@@ -35,46 +28,28 @@ async def request_speak(
 async def stop_speaking(
     group_id: str | uuid.UUID,
     user_id: str | uuid.UUID,
-    group_type: str
 ):
     group_id_str = str(group_id)
     user_id_str = str(user_id)
 
-    if group_type == "private":
-        await grant_publish_permission(group_id_str, user_id_str, False)
-        return True
-
     released = await release_speaker(group_id_str, user_id_str)
     if released:
         await grant_publish_permission(group_id_str, user_id_str, False)
     return released
 
-async def current_speaker(
-    db: AsyncSession,
-    group_id: str | uuid.UUID
-):
-    group_id_uuid = group_id if isinstance(group_id, uuid.UUID) else uuid.UUID(group_id)
-    group_id_str = str(group_id_uuid)
-
-    group = await get_group_by_id(db, group_id_uuid)
-
-    if not group:
-        return None
-
-    if str(group.type) == "private":
-        return None
-
+async def current_speaker(group_id: str | uuid.UUID):
+    group_id_str = str(group_id)
     return await get_active_speaker(group_id_str)
 
 async def grant_publish_permission(room_name: str, identity: str, can_publish: bool):
-    lk_api = get_livekit_api() # همان متدی که در client.py نوشتی
+    lk_api = get_livekit_api()
     await lk_api.room.update_participant(
         api.UpdateParticipantRequest(
             room=room_name,
             identity=identity,
             permission=api.ParticipantPermission(
                 can_publish=can_publish,
-                can_subscribe=True # همیشه بتواند بشنود
+                can_subscribe=True
             )
         )
     )
\ No newline at end of file
diff --git a/Back/domains/realtime/ws.py b/Back/domains/realtime/ws.py
index 1f49485..c610f74 100644
--- a/Back/domains/realtime/ws.py
+++ b/Back/domains/realtime/ws.py
@@ -1,4 +1,6 @@
 import uuid
+import time
+import json
 from fastapi import APIRouter, WebSocket, WebSocketDisconnect, Request, Header, status, HTTPException
 from livekit import api
 from core.config import settings
@@ -79,10 +81,6 @@ async def group_ws(websocket: WebSocket, group_id: str):
             await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
             return
 
-        from domains.groups.repo import get_group_by_id
-        group = await get_group_by_id(db, group_id_uuid)
-        group_type = str(group.type) if group else "public"
-    
     user_id = str(user.id)
     # connect websocket
     await manager.connect(group_id, websocket)
@@ -111,13 +109,28 @@ async def group_ws(websocket: WebSocket, group_id: str):
         }
     )
 
+    last_action_time = 0.0
+
     try:
         while True:
-            data = await websocket.receive_json()
+            text_data = await websocket.receive_text()
+        
+            if len(text_data) > 20000:
+                await websocket.close(code=status.WS_1009_MESSAGE_TOO_BIG)
+                return
+            
+            data = json.loads(text_data)
             event = data.get("type")
+
+            # anti spam
+            current_time = time.time()
+            if current_time - last_action_time < 0.5:
+                continue
+            last_action_time = current_time
+
             # user wants to speak
             if event == "request_speak":
-                success = await request_speak(group_id, user_id, group_type)
+                success = await request_speak(group_id, user_id)
                 if success:
                     # Broadcast globally that someone is speaking
                     await manager.broadcast(
@@ -133,8 +146,7 @@ async def group_ws(websocket: WebSocket, group_id: str):
                     })
                 else:
                     # someone else is speaking
-                    async with AsyncSessionLocal() as temp_db:
-                        speaker = await current_speaker(temp_db, group_id)
+                    speaker = await current_speaker(group_id)
                     await websocket.send_json(
                         {
                             "type": "speaker_busy",
@@ -144,7 +156,7 @@ async def group_ws(websocket: WebSocket, group_id: str):
 
             # user stops speaking
             elif event == "stop_speak":
-                released = await stop_speaking(group_id, user_id, group_type)
+                released = await stop_speaking(group_id, user_id)
                 if released:
                     await manager.broadcast(
                         group_id,
@@ -160,7 +172,7 @@ async def group_ws(websocket: WebSocket, group_id: str):
     except WebSocketDisconnect:
         manager.disconnect(group_id, websocket)
         await user_leave_group(group_id, user_id)
-        await stop_speaking(group_id, user_id, group_type)
+        await stop_speaking(group_id, user_id)
         await manager.broadcast(
             group_id,
             {
diff --git a/Back/domains/realtime/ws_manager.py b/Back/domains/realtime/ws_manager.py
index 5714183..b923194 100644
--- a/Back/domains/realtime/ws_manager.py
+++ b/Back/domains/realtime/ws_manager.py
@@ -17,8 +17,6 @@ class ConnectionManager:
     async def _setup_pubsub(self):
         if self._pubsub is None:
             self._pubsub = redis_client.pubsub()
-            # Subscribe to all websocket broadcasting channels
-            # We use Any for _pubsub to satisfy type checkers that don't know redis-py return types
             await self._pubsub.psubscribe("ws:group:*")
             self._listen_task = asyncio.create_task(self._redis_listener())
 
diff --git a/Back/domains/users/models.py b/Back/domains/users/models.py
index 0e180a7..3da5242 100644
--- a/Back/domains/users/models.py
+++ b/Back/domains/users/models.py
@@ -1,4 +1,3 @@
-from enum import Enum
 from sqlalchemy import String, Boolean, Integer
 from sqlalchemy.orm import Mapped, mapped_column
 
diff --git a/Back/domains/users/schemas.py b/Back/domains/users/schemas.py
index ecd0d7d..88467c3 100644
--- a/Back/domains/users/schemas.py
+++ b/Back/domains/users/schemas.py
@@ -3,9 +3,9 @@ from pydantic import BaseModel, Field, field_validator
 import re
 
 class UserCreate(BaseModel):
-    username: str
+    username: str = Field(..., max_length=20, description='username of the user')
     phone_number: str | None = Field(None, description="11 digit phone number")
-    is_admin: bool = False
+    is_admin: bool = Field(False)
 
     @field_validator("phone_number")
     @classmethod
@@ -13,19 +13,19 @@ class UserCreate(BaseModel):
         if v is None:
             return v
         if not re.match(r"^09\d{9}$", v):
-            raise ValueError("Phone number must start with 09 and be exactly 11 digits")
+            raise ValueError("شماره تلفن باید ۱۱ رقم باشد و با ۰۹ شروع شود")
         return v
 
 class UserResponse(BaseModel):
-    id: uuid.UUID
-    username: str
-    phone_number: str | None
-    is_admin: bool
-    is_active: bool
+    id: uuid.UUID = Field(...)
+    username: str = Field(..., description='username of the user')
+    phone_number: str | None = Field(..., description='phone number of the user')
+    is_admin: bool = Field(..., description='is admin')
+    is_active: bool = Field(..., description='is active')
 
     class Config:
         from_attributes = True
 
 class UserCreateResult(BaseModel):
-    user: UserResponse
-    secret: str
+    user: UserResponse = Field(..., description='user created')
+    secret: str = Field(..., description='secret of the user')
diff --git a/Back/main.py b/Back/main.py
index 17bd676..64322e5 100644
--- a/Back/main.py
+++ b/Back/main.py
@@ -1,5 +1,5 @@
 from contextlib import asynccontextmanager
-from fastapi import FastAPI
+from fastapi import FastAPI, Depends
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi_swagger import patch_fastapi
 
@@ -11,6 +11,7 @@ from domains.realtime.ws import router as realtime_router
 from domains.notifications.api import router as notifications_router
 from integrations.livekit.client import close_livekit_api
 from db.redis import redis_client
+from core.rate_limit import RateLimiter
 
 
 @asynccontextmanager
@@ -33,6 +34,7 @@ async def lifespan(app: FastAPI):
     await close_livekit_api()
     await redis_client.close()
 
+global_limiter = RateLimiter(requests=30, window_seconds=60, scope="global")
 
 app = FastAPI(
     title="NEDA API",
@@ -40,7 +42,8 @@ app = FastAPI(
     version="1.0.0",
     lifespan=lifespan,
     docs_url=None,
-    swagger_ui_oauth2_redirect_url=None
+    swagger_ui_oauth2_redirect_url=None,
+    dependencies=[Depends(global_limiter)]
 )
 patch_fastapi(app,docs_url="/swagger")
 
@@ -55,7 +58,16 @@ app.add_middleware(
     allow_methods=["*"],
     allow_headers=["*"],
 )
-
+# app.add_middleware(
+#     CORSMiddleware,
+#     allow_origins=[
+#         "https://app.neda.com",
+#         "http://localhost:3000" # فقط برای تست برنامه‌نویس فرانت‌اند
+#     ],
+#     allow_credentials=True,
+#     allow_methods=["GET", "POST", "PUT", "DELETE"], # محدود کردن متدها
+#     allow_headers=["Authorization", "Content-Type"], # محدود کردن هدرها
+# )
 
 # -------------------------
 # Routers