pub fn add_task_external(
conn: &Connection,
task_id: &str,
reference: &str,
) -> Result<()>Expand description
Append an external reference to tasks.external. The column is
stored as a comma-separated list — small, append-mostly, no
uniqueness constraint. Acceptable shapes (loose, not enforced):
beads:claude-memory-rsw, github:#42, jira:PROJ-1234.