hook: have a generic hook for transaction opening We are adding generic hooking for all transactions. We do not really have any useful information to include when opening the transaction but this is a useful time to allow a hook anyway. We better let people abort transaction before they happen than after multiple seconds/minutes of processing.

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try:

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    import coverage

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    getattr(coverage, 'process_startup', lambda: None)()

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except ImportError:

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    pass