[sr-dev] [kamailio/kamailio] DB Postgres BLOB conversion for presence (#1255)

[sergey-safarov]

Think yes. According [doc](https://www.postgresql.org/docs/devel/static/datatype-binary.html)
`The “hex” format encodes binary data as 2 hexadecimal digits per byte, most significant nibble first. The entire string is preceded by the sequence \x`
According logs kamailio got string with escape `\x`.
Also according same page
`The bytea type supports two external formats for input and output: PostgreSQL's historical “escape” format, and “hex” format. Both of these are always accepted on input. The output format depends on the configuration parameter bytea_output;`

I will try make workarround at table config

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