Add docker

backend/app/chats/models.py

@@ -0,0 +1,13 @@
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy import ForeignKey
+
+from app.core.database import Base
+
+
+class MessageModel(Base):
+    __tablename__ = "message"
+
+    id: Mapped[int] = mapped_column(primary_key=True, index=True)
+    sender_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), index=True)
+    recipient_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), index=True)
+    content: Mapped[str] = mapped_column()