[views] implement a custom json error view If the client asked for ``(e)jsonexport`` view, answer him with a json response rather than an error formatted in a big HTML blob. add a custom _requested_vid predicate. In cw 3.21, it will be deprecated in favor of ``match_form_params(vid=('jsonexport', 'ejsonexport'))``

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for table, column in [

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        ('transactions', 'tx_time'),

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        ('tx_entity_actions', 'tx_uuid'),

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        ('tx_relation_actions', 'tx_uuid')]:

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    repo.system_source.create_index(session, table, column)

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commit()