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SQLITE_IOERR on `pragma optimize`
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I'm sometimes getting `SQLITE_IOERR` from sqlite 3.28.0 when I run `pragma optimize` (with no mask) prior to closing a connection, and I'm at a loss for what to do about it.

`pragma optimize(0xffff)` gives me
```
ANALYZE "main"."causal_parent"
ANALYZE "main"."causal"
```
which seems reasonable, but then `pragma optimize`, immediately following that, crashes.

It's a new database, created by a unit test.  I don't get a crash if I don't run `pragma optimize`.

Any suggestions?

Thanks,
Arya

P.S. Fwiw, I do use `PRAGMA journal_mode = WAL;` after db open.