Jeremy Lin 78d07e2fda Add default connection-scoped pragmas for SQLite ...

`PRAGMA busy_timeout = 5000` tells SQLite to keep trying for up to 5000 ms
when there is lock contention, rather than aborting immediately. This should
hopefully prevent the vast majority of "database is locked" panics observed
since the async transition.

`PRAGMA synchronous = NORMAL` trades better performance for a small potential
loss in durability (the default is `FULL`). The SQLite docs recommend `NORMAL`
as "a good choice for most applications running in WAL mode".

2022-04-26 17:55:19 -07:00

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