However, I would like to see an option to include the timestamp if someone wants it.
The timestamp is already in the header for custom dumps. Have a look at the first few lines from a 'pg_restore -l'.
In terms of general comments, there is already a 'WARNING' type TOC entry for custom dumps. This emits a warning message when pg_restore is called.
A similar mechanism could be used to dump SQL comments. eg. new TOC type of 'SQL_COMMENT' with a defn starting with '--' would work with old & new pg_dump versions. It might be a good idea to investigate the likely uses for these comments, since the TOC entries may be suppressed depending on whether they are deemed to be part of the schema or the data. Once the modes of use are defined, a better mechanism may become apparent.
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