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Faster method for migrating data in batches #20

@tompollard

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@tompollard

The current approach (_copy_data) for loading data from the source database relies on limit + offset, which is slow. Replace it with a faster approach, perhaps using yield_per or a window function. e.g.:

        for data in source_session.query(table).yield_per(batchsize):
            _insert_data(target_session,source_schema,table,data)

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