When you are using a database of this type, it is
extremely important both to use transactions and to catch any kill-signals so that any active work is cleanly rolled-back and the connection brought to an orderly close. You certainly
can damage the file by interrupting any process while it is in progress. In fact, you
really want to avoid killing the process at all ... or, needing to. Transactions are a very important part of the in-memory caching mechanisms and for ensuring that data does get flushed to disk. (For instance, loops that handle large amounts of data should periodically commit and then start a new transaction, with a final commit at the end of the loop.)
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