diff --git a/backend/alembic/versions/50ae013ce530_add_user_agent_catalog.py b/backend/alembic/versions/50ae013ce530_add_user_agent_catalog.py
index b5b106d..8872071 100644
--- a/backend/alembic/versions/50ae013ce530_add_user_agent_catalog.py
+++ b/backend/alembic/versions/50ae013ce530_add_user_agent_catalog.py
@@ -20,6 +20,12 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
+    op.drop_constraint("uq_user_agents_user_id", "user_agents", type_="unique")
+
+    op.create_unique_constraint(
+        "uq_user_agents_user_id_agent_type", "user_agents", ["user_id", "agent_type"]
+    )
+
     op.create_table(
         "user_agent_catalog",
         sa.Column("agent_type", sa.String(20), nullable=False),
@@ -132,6 +138,12 @@ def downgrade() -> None:
         $$;
     """)
 
+    op.drop_constraint(
+        "uq_user_agents_user_id_agent_type", "user_agents", type_="unique"
+    )
+
+    op.create_unique_constraint("uq_user_agents_user_id", "user_agents", ["user_id"])
+
     _drop_rls("user_agent_catalog")
     op.drop_constraint(
         "chk_user_agent_catalog_status", "user_agent_catalog", type_="check"