Function resume_workflow 

pub async fn resume_workflow(
    db: &DatabaseConnection,
    task_id: Uuid,
) -> Result<(), DurableError>

Resume a failed workflow from its last completed step (DBOS-style).

Resets the workflow from FAILED → RUNNING, resets failed child steps to PENDING, and re-dispatches the registered workflow function. Completed steps replay from their checkpointed outputs.

If no WorkflowRegistration is found for the workflow’s handler, the workflow is still reset but not auto-dispatched — use Ctx::from_id() to drive it manually.

durable::resume_workflow(&db, workflow_id).await?;