Add migration: unique constraint for group-role-association

lib/galaxy/model/migrations/alembic/versions_gxy/7cdc4eaff558_add_unique_constraint_to_group_role_.py

@@ -0,0 +1,35 @@
+"""Add unique constraint to group-role-association
+
+Revision ID: 7cdc4eaff558
+Revises: ad1d893fa15f
+Create Date: 2024-08-29 15:18:05.790399
+
+"""
+
+from galaxy.model.migrations.util import (
+    create_unique_constraint,
+    drop_constraint,
+    transaction,
+)
+
+# revision identifiers, used by Alembic.
+revision = "7cdc4eaff558"
+down_revision = "ad1d893fa15f"
+branch_labels = None
+depends_on = None
+
+table_name = "group_role_association"
+constraint_column_names = ["group_id", "role_id"]
+unique_constraint_name = (
+    "group_role_association_group_id_key"  # This is what the model's naming convention will generate.
+)
+
+
+def upgrade():
+    with transaction():
+        create_unique_constraint(unique_constraint_name, table_name, constraint_column_names)
+
+
+def downgrade():
+    with transaction():
+        drop_constraint(unique_constraint_name, table_name)