diff --git a/app/models.py b/app/models.py
index ef477dc..de7eb40 100644
--- a/app/models.py
+++ b/app/models.py
@@ -52,7 +52,7 @@ class Password(db.Model):
     __tablename__ = "password"
 
     id: Mapped[int] = mapped_column(primary_key=True)
-    value: Mapped[str] = mapped_column(String(60))
+    value: Mapped[str] = mapped_column(String(60), unique=True)
     expires_at: Mapped[Optional[datetime]] = mapped_column(
         UTCDateTime()
     )  # Optional expiration