diff --git a/src/knowledge/object.py b/src/knowledge/object.py
deleted file mode 100644
index f7a127e..0000000
--- a/src/knowledge/object.py
+++ /dev/null
@@ -1,65 +0,0 @@
-
-# define a object type enum
-from abc import ABC, abstractmethod
-from enum import Enum
-
-class ObjectType(Enum):
-    TextChunk = 1
-    Image = 2
-    Email = 101
-
-
-# define a object ID class to identify a object
-class ObjectID: # pylint: disable=too-few-public-methods
-    def __init__(self, object_type, digist):
-        self.object_type = object_type
-        self.digist = digist
-
-    def __str__(self):
-        return f"{self.object_type.name}:{self.digist}"
-    
-
-# define a object class
-class KnowledgeObject(ABC): # pylint: disable=too-few-public-methods
-    def __init__(self, object_type: ObjectType):
-        self.object_type = object_type
-
-    @abstractmethod
-    def get_id(self) -> ObjectID:
-        pass
-
-    # define a to binary method to convert object to binary
-    @abstractmethod
-    def to_binary(self) -> bytes:
-        pass
-
-    # define a from binary method to convert binary to object
-    @abstractmethod
-    def from_binary(self, binary: bytes):
-        pass
-
-
-# define a text chunk class
-class TextChunkObject(KnowledgeObject): # pylint: disable=too-few-public-methods
-    def __init__(self, text: str):
-        super().__init__(ObjectType.TextChunk)
-        self.text = text
-
-
-# define a image class
-class ImageObject(KnowledgeObject): # pylint: disable=too-few-public-methods
-    def __init__(self, meta, path):
-        super().__init__(ObjectType.Image)
-        self.meta = meta
-        self.path = path
-
-
-# define a email class
-class EmailObject(KnowledgeObject): # pylint: disable=too-few-public-methods
-    def __init__(self, meta):
-        super().__init__(ObjectType.Email)
-        self.meta = meta
-        self.text = [ObjectID]
-        self.images = [ObjectID]
-
-    
diff --git a/src/knowledge/object_storage.py b/src/knowledge/object_storage.py
deleted file mode 100644
index 1a6f85e..0000000
--- a/src/knowledge/object_storage.py
+++ /dev/null
@@ -1,33 +0,0 @@
-# import RDB LargeBinary
-from sqlalchemy import Column, String, LargeBinary, create_engine, sessionmaker, pickle
-from .object import KnowledgeObject
-
-# implement object storage with RDB
-# define object storage table
-class ObjectStorageTable(Base):
-    __tablename__ = 'object_storage'
-    id = Column(String, primary_key=True)
-    parent = Column(String, nullable=True)
-    object = Column(LargeBinary, nullable=False)
-
-    def __init__(self, id, parent, object): # pylint: disable=redefined-builtin
-        self.id = id
-        self.parent = parent
-        self.object = object
-
-# define object storage class
-class ObjectStorage:
-    async def __init__(self, db_url):
-        self.engine = create_engine(db_url)
-        self.session = sessionmaker(bind=self.engine)() # pylint: disable=not-callable
-
-    async def get(self, id) -> [KnowledgeObject, KnowledgeObject]:
-        obj = self.session.query(ObjectStorageTable).filter(ObjectStorageTable.id == id).first()
-        if obj is None:
-            return None
-        return pickle.loads(obj.object)
-    
-    # define insert method
-    async def insert(self, object, parent): # pylint: disable=redefined-builtin
-        obj = ObjectStorageTable(id, parent, pickle.dumps(object))
-        
\ No newline at end of file