James Robinson <jlrobins(at)socialserve(dot)com> writes:
> ERROR: duplicate key value violates unique constraint "pg_toast_22608264_index"
> DETAIL: Key (chunk_id, chunk_seq)=(22354927, 0) already exists.
> The error is raised at the 'cluster' right after the commit.
This is probably the same issue reported as bug #6393 and patched a
couple weeks ago:
http://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=e5f97c5f81874695f9436fe980f7aa51b637bd54
regards, tom lane