Re: WIP: write flat files at startup, enforce XID wrap limit

Tom Lane wrote:
> format of the pg_pwd and pg_group flat files: group membership has
> to be recorded in terms of user sysids not user names, so that we
> can avoid doing SysCache lookups in write_group_file.  That's a

This also expands the problems of reusing user ids for deleted users,
but I agree user-ids in pg_group are an improvement.

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