[ckan-dev] can you recommend some detailed and deep document about CKAN code architecture and CKAN database table column design?

[bupt bupt]

hello everyone,
      now I can learn sth about CKAN architecture from "
https://gist.github.com/seanh/3414107" and "
http://docs.ckan.org/en/latest/architecture.html" . But I want to research
CKAN code and database tables more deeply and detailed.
     can you give me more detailed materials which deeply introduced CKAN
code and database tables design, where can I find database table design
document, including what's the purpose of designing every table and view。
    thank you very much~~
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