[source/native] refactor eid generation code This set of related methods clutters the native source API. It will be better served with a dedicated eid genrator object. Related to #3526594. [jcr: allocate the eid generator in __init__]

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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()