add check for pre-existing history records

add check for pre-existing history records

Fixed issue in history_meta example where the "version" column in the
versioned table needs to default to the most recent version number in the
history table on INSERT, to suit the use case of a table where rows are
deleted, and can then be replaced by new rows that re-use the same primary
key identity.  This fix adds an additonal SELECT query per INSERT in the
main table, which may be inefficient; for cases where primary keys are not
re-used, the default function may be omitted.  Patch courtesy  Philipp H.
v. Loewenfeld.

Fixes: #10267
Change-Id: I6b0737a7e871763f95fd636c9ad98b80f3b5808e