I use Dancer::Plugin::Database and the update process is: 
database->quick_update(...); 
database->commit();

[download]

The reason I say it's not only DB is because on another environment, it fails to resolve the session user after submit.
session('user') which is set by the first thread throws an uninitialized warning value after submitting (supposedly pickup by the 2nd worker).

In reply to Re^5: Dancer & Plackup - Redirect not refreshing page data by jeromek
in thread Dancer & Plackup - Redirect not refreshing page data by jeromek

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