Disable FTL's DB functionality on errors

[DL6ER]

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Disable FTL's database functionality on all errors except SQLITE_BUSY. I'm not sure if other errors should be (temporarily) allowed as well, but I don't think so.

"Error codes" are a subset of "result codes" that indicate that something has gone wrong. There are only a few non-error result codes: SQLITE_OK, SQLITE_ROW, and SQLITE_DONE. The term "error code" means any result code other than these three.

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