This morning I accidentally double clicked on the straw RSS aggregator icon and two copies raced
to see who could corrupt the app's database first.   
straw refused to start with this error:
    ItemStore.py:52:__init__: DB_RUNRECOVERY: Fatal error, run 
        database recovery - - PANIC: Invalid argument
    Recovery Error: See README for details on how to recover data.
And the straw README says to do this:
    $ db_recover -h $HOME/.straw -c -v
    $ db_checkpoint -1 -v
Fair enough, but I don't have those scripts installed db\_recover or db\_checkpoint.  It turns out that they are in the libdb2-util package.  (apt-get install libdb2-util)
Fortunately the recovery processed work fine.