Encode bytea fields #72
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Aims to fix https://github.com/SUSE/spacewalk/issues/23726
We detected a case where binary data contained backslashes. We've been using pq.QuoteLiteral but in these cases we end up getting invalid insert statements.
Besides, it also had some line breaks and contained sensitive information.
My suggestion here is to encode this type of data to hexadecimal as it would address the problems with escaping characters, keeps the statements tighter and also does not directly exposes any sensitive information that may be copied around servers.
We apply the same escape method to varchar fields. However i wanted to exclude them, at least for now. Encoding and decoding means having an additional processing overhead and this hasn't been a problem so far.