Use SQLITE_OPEN_FULLMUTEX for thread-safety
Use SQLITE_OPEN_FULLMUTEX for thread-safety

SQLite recommends it to avoid threading issues (which we're occasionally
seeing), and they're enabled by default, so let's incur the slight
performance penalty in the interest of avoiding the occasional crash.

Signed-off-by: Stephen Celis <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@stephencelis.com>

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