diff --git a/lib/galaxy/model/__init__.py b/lib/galaxy/model/__init__.py
index 98e37678851..86ed2c20e88 100644
--- a/lib/galaxy/model/__init__.py
+++ b/lib/galaxy/model/__init__.py
@@ -3597,13 +3597,13 @@ class UserRoleAssociation(Base, RepresentById):
     __tablename__ = "user_role_association"
 
     id: Mapped[int] = mapped_column(primary_key=True)
-    user_id: Mapped[Optional[int]] = mapped_column(ForeignKey("galaxy_user.id"), index=True)
-    role_id: Mapped[Optional[int]] = mapped_column(ForeignKey("role.id"), index=True)
+    user_id: Mapped[int] = mapped_column(ForeignKey("galaxy_user.id"), index=True, nullable=True)
+    role_id: Mapped[int] = mapped_column(ForeignKey("role.id"), index=True, nullable=True)
     create_time: Mapped[datetime] = mapped_column(default=now, nullable=True)
     update_time: Mapped[datetime] = mapped_column(default=now, onupdate=now, nullable=True)
 
-    user: Mapped[Optional["User"]] = relationship(back_populates="roles")
-    role: Mapped[Optional["Role"]] = relationship(back_populates="users")
+    user: Mapped["User"] = relationship(back_populates="roles")
+    role: Mapped["Role"] = relationship(back_populates="users")
 
     def __init__(self, user, role):
         add_object_to_object_session(self, user)