Konstantin Käfer 7d58a41de5 make sqlite storage more resilient to sporadic errors ...

- catch SQLite exceptions and report them
- failed statements are ignored, we're really just caching here, so if it fails we're handling it gracefully elsewhere
- handle cases where the database file goes away after we opened it
- handle cases where the schema wasn't created after the database file was opened successfully
- add tests

2015-04-07 18:04:23 +02:00

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