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r2d2-sqlite opens connections in shared cache mode: https://github.com/ivanceras/r2d2-sqlite/blob/06aa366cfe0846e491550b7e177ca0024bf923a9/src/lib.rs#L141
Per documentation (https://www.sqlite.org/sharedcache.html#dontuse), this is discouraged. In practice the dependency is trivially replaceable anyway.