Add a transaction context manager to backend#2387
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This allows to group operations that will be rolled back if the context is exited with an exception. This is laying the groundwork for implementing `Node` as part of the new backend system as links, caches, etc will have to be done in a transaction.
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This allows to group operations that will be rolled back if the
context is exited with an exception. This is laying the groundwork for
implementing
Nodeas part of the new backend system as links, caches,etc will have to be done in a transaction.