[mysql] prevent cascading deletes on jobs by keep_alive_at
#421
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keep_alive_at
function uses replace to update the worker row and that forces the jobs child rows to be deleted due to their foreign key relationship. This behavior is due MySQLREPLACE
deletes first a row when duplicated.Using
INSERT .. ON DUPLICATE KEY
solves the issue. Jobs are not deleted anymore when thekeep_alive_at
runs. Users should be responsible about truncating the jobs table with this approach. Fixes #48