Function withdraw 

pub async fn withdraw(
    pool: &PgPool,
    actor: &Actor,
    change_id: Uuid,
) -> AppResult<Change>

Pulls a change back from review into draft.

Invariants

• Permission: CAD editor who is the author (or an administrator, or a manager of every affected group while the author is deactivated); the change is in review (409).
• Locks: the change row (FOR UPDATE), then every revision (revisions::lock) before its state changes.
• Audit: change.withdraw.
• Notifications: author, reviewers and watchers of the change, except the actor.
• Webhooks: none.
• Data: the revisions go back to in work and all reviews are reset to pending.
• Atomic: one transaction.