add caching of statistics data
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Key: VCL-477
URL: https://issues.apache.org/jira/browse/VCL-477
Project: VCL
Issue Type: New Feature
Components: database, web gui (frontend)
Reporter: Josh Thompson
Fix For: 2.3
Create a table in which statistic data for the graphs is cached so that it
doesn't have to be generated every time the data is accessed.
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