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From: Tom Lane <tgl@sss.pgh.pa.us>
To: ml@ft-c.de, ft <ftimmer@ft-c.de>
cc: pgsql-sql@lists.postgresql.org
Subject: Re: decode/encode backslash to base64
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ft <ftimmer@ft-c.de> writes:
> here is an example for decode and encode 
> a string with backslash: 'a\'

That is not valid input syntax for bytea.  See

https://www.postgresql.org/docs/current/datatype-binary.html

You've said nothing about what your actual purpose is,
so it's difficult to suggest what you should do differently.

			regards, tom lane