diff --git a/app/models.py b/app/models.py
index 5a1ea6c..ef477dc 100644
--- a/app/models.py
+++ b/app/models.py
@@ -78,10 +78,13 @@ class Password(db.Model):
 class Deck(db.Model):
     __tablename__ = "deck"
 
-    __table_args__ = (UniqueConstraint("course_id", "deck", name="_course_deck_uc"),)
+    __table_args__ = (
+            UniqueConstraint("course_id", "deck", name="_course_deck_uc"),
+            UniqueConstraint("course_id", "name", name="_course_name_uc"),
+    )
 
     id: Mapped[int] = mapped_column(primary_key=True)
-    name: Mapped[str] = mapped_column(String(60), unique=True, nullable=False)
+    name: Mapped[str] = mapped_column(String(60), nullable=False)
     deck: Mapped[str] = mapped_column(String(60), nullable=False)
     description: Mapped[str] = mapped_column(String(200))
     index_file: Mapped[str] = mapped_column(String(40), nullable=False)