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POST /admin/migrations/:id/cancel

Cancel an in-flight migration. Only valid for migrations in pending, discovering, or awaiting_review status. Auth: requireOwnerOrAdmin
Cancellation flips the migration’s status to cancelled (setting completed_at) and records a migration.cancel critical audit entry. It does not automatically tear down the discovery lease or any provisioned DB proxy routes — remove those separately via the DELETE /admin/migrations/:id/db-proxy-routes/:routeId endpoint.

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Response

Returns 404 if the migration is not found or its status is anything other than pending, discovering, or awaiting_review (for example committing, failed, completed, or already cancelled).