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Use "dirty bit enqueuing" for changesets

Administrator requested to merge mrn/dirty-bit-enqueuing into main

Created by: mrnugget

Fixes https://github.com/sourcegraph/sourcegraph/issues/12827.

This splits up the previous changesets.reconciler_state column into two.

Previously:

  • changesets.reconciler_state: 'queued' | 'processing' | 'errored' | 'completed'

With this change:

  • changesets.enqueued: true | false
  • changesets.reconciler_state: 'processing' | 'errored' | 'completed'

The enqueued acts like a dirty bit that's cleared when a changeset is dequeued.

That allows us to mark a changeset as enqueud while it's being processed.

On a higher level that means users can apply a new campaign spec, while the old one is still being applied.

There's more to do (see https://github.com/sourcegraph/sourcegraph/issues/12827#issuecomment-684829489 and https://github.com/sourcegraph/sourcegraph/issues/12827#issuecomment-684834304), but this is the start.

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