diff --git a/backend/python/app/auth.py b/backend/python/app/auth.py
index 3367538..c02a28a 100644
--- a/backend/python/app/auth.py
+++ b/backend/python/app/auth.py
@@ -12,30 +12,6 @@ from fastapi import Depends, HTTPException, status, Request
 from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
 from .config import SECRET_KEY, ALGORITHM, ACCESS_TOKEN_EXPIRE_MINUTES
 
-
-# Phase0: 5-level RBAC hierarchy
-ROLE_HIERARCHY = {
-    "super_admin": 100,
-    "admin": 80,
-    "developer": 50,
-    "user": 30,
-    "guest": 10,
-}
-
-def has_role(user_role: str, required: str) -> bool:
-    return ROLE_HIERARCHY.get(user_role, 0) >= ROLE_HIERARCHY.get(required, 0)
-
-
-async def get_current_tenant(
-    credentials: HTTPAuthorizationCredentials = Depends(security),
-) -> Optional[str]:
-    """Phase0: Extract tenant_id from JWT token"""
-    try:
-        payload = jwt.decode(credentials.credentials, SECRET_KEY, algorithms=[ALGORITHM])
-        return payload.get("tenant_id")
-    except JWTError:
-        return None
-
 logger = logging.getLogger(__name__)
 
 security = HTTPBearer()
@@ -59,10 +35,8 @@ def verify_password(plain_password: str, hashed_password: str) -> bool:
         return False
 
 
-def create_access_token(data: dict, expires_delta: Optional[timedelta] = None, tenant_id: str = None) -> str:
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
     to_encode = data.copy()
-    if tenant_id:
-        to_encode["tenant_id"] = tenant_id
     expire = datetime.utcnow() + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
     to_encode.update({"exp": expire})
     return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)