How do you stop an old background task from overwriting newer state?

Uses expected versions and conditional writes so delayed or retried Python tasks cannot commit stale decisions.

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A queued task can start after the underlying record has changed, so I include an expected version or transition identity with the work. When the worker writes, it uses a conditional update such as WHERE id = ? AND version = ?. If no row changes, the task is stale and must not overwrite the newer state. Reloading the record without comparing versions is not enough because another update can happen before the write.

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Uses expected versions and conditional writes so delayed or retried Python tasks cannot commit stale decisions.

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Uses expected versions and conditional writes so delayed or retried Python tasks cannot commit stale decisions.
A queued task can start after the underlying record has changed, so I include an expected version or transition identity with the work. When the worker writes, it uses a conditional update such as WHERE id = ? AND version = ?. If no row changes, the task is stale and must not overwrite the newer state. Reloading the record without comparing versions is not enough because another update can happen before the write.
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The stale outcome is part of the workflow, not automatically an error to retry. Some tasks can safely stop, some should recompute from current state, and others need reconciliation because an external effect already happened. A monotonically increasing generation can also fence an old lease holder from writing after a newer worker takes ownership. The version travels with the durable intent rather than being guessed from task start time.

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Blindly saving a stale ORM object
Retrying stale work forever
Using a timestamp as the only ownership proof

How do you stop an old background task from overwriting newer state?

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