If you use a traditional database engine (such as MySQL/MariaDB) then
maximum character field lengths are enforced, however depending on the
configuration this may result in an exception rather than a warning and
truncation and will also break the per-layer transaction. To avoid that
ugliness, add a signal handler to do it internally, which as a bonus
lets us know if field lenghts are too short for data when using database
engines that don't enforce lengths (e.g. SQLite).
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
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