Constant TASK_COLUMNS_NO_SPEC 

pub const TASK_COLUMNS_NO_SPEC: &str = "id, parent_id, name, NULL as spec, status, complexity, priority, first_todo_at, first_doing_at, first_done_at, active_form, owner";

Task column list without spec (uses NULL placeholder)

Used when spec is not needed but schema compatibility is required. Columns: id, parent_id, name, NULL as spec, status, complexity, priority, first_todo_at, first_doing_at, first_done_at, active_form, owner