This commit reattempts a change to remove the write lock that was
previously tried in 998e831. This change will reduce the number of
locks on the database which should help reduce error messages that
applications see when they do not have busy_timeout set.
In addition to the lock removal, a passive checkpoint is issued
immediately before the read lock is obtained to prevent additional
checkpoints by the application itself. SQLite does not support
checkpoints from an active transaction so it cannot be done afterward.
1d1fd6e686