Increase the 'database open' timeout from 5 seconds to 1 minute. This
timeout also covers database migrations, and the recently added one that
adds a bunch of `NOT NULL` clauses could time out with the old 5 sec
limit.
The reason this takes long, is that SQLite doesn't directly support
adding `NOT NULL` clauses to columns. The only way to do this is to
create a new table with the desired schema, copy all data over, then
drop the old table. And with a big enough database, this takes time.
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