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This is a relatively small change which ensures we handle libpq errors whilst
COPY
ing data and abort in case any error occurs. This partially fixes #80 which is a partial aid against data loss where we lose at most one batch of data in case of errors on postgresql side. The batch size is hardcoded to 2000 at the moment. The second part of the issue where we ensure to retain messages in case of a libpq error is left to be fixed in a future PR.