Constant TASK_COLUMNS_PREFIXED 

pub const TASK_COLUMNS_PREFIXED: &str = "t.id, t.parent_id, t.name, t.spec, t.status, t.complexity, t.priority, t.first_todo_at, t.first_doing_at, t.first_done_at, t.active_form, t.owner, t.metadata";

Task column list with t. table prefix for JOIN queries

Same columns as TASK_COLUMNS but each prefixed with t. to avoid ambiguity when joining with other tables (e.g. dependencies).