diff --git a/app/models.py b/app/models.py
index 4136fbf..a0f7a0f 100644
--- a/app/models.py
+++ b/app/models.py
@@ -11,7 +11,9 @@ class Conversation(Base):
     title = Column(String)
     messages = relationship("Message", back_populates="conversation")
     attachments = relationship("Attachment", back_populates="conversation")
-
+    tags = Column(String)  # comma-separated tags
+    shared = Column(String)  # null or email of recipient
+    
 class Message(Base):
     __tablename__ = "messages"
     id = Column(String, primary_key=True)