Faux database constraint

DB::statement('ALTER TABLE provisions ADD CHECK (IF(is_default, (SELECT COUNT(*) FROM provisions WHERE is_default = true) = 1, 1))');

        // Unique constraint to ensure only one default per provision_type
        $table->unique(['provision_id', 'provision_type']);

        // Foreign key to provisions table
        $table->foreign('provision_id')->references('id')->on('provisions')->onDelete('cascade');