caches: use .refresh() instead of .invalidate()...

caches: use .refresh() instead of .invalidate() - .invalidate() does a delete of cached valued under a key, which means in previous logic we delete, get_or_create, and compute. - .refresh() is simply replacing exising key with newly computed values, this creates less locks, and it's faster.

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Increase Database Performance

For tuning PostgreSQL we recommend reading: http://www.revsys.com/writings/postgresql-performance.html

For tuning MySQL we recommend reading: http://www.tecmint.com/mysql-mariadb-performance-tuning-and-optimization/

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