Add Message model

models/message.py

@@ -0,0 +1,20 @@
+from sqlalchemy import Column, String, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from core.database import Base
+import uuid
+
+class Message(Base):
+    __tablename__ = "messages"
+    
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    sender_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
+    recipient_id = Column(String, ForeignKey("users.id"), nullable=False, index=True)
+    content = Column(String, nullable=False)
+    is_read = Column(Boolean, default=False)
+    
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+    
+    sender = relationship("User", foreign_keys=[sender_id], back_populates="sent_messages")
+    recipient = relationship("User", foreign_keys=[recipient_id], back_populates="received_messages")