postgresql-scratchpad

In a Nutshell, postgresql-scratchpad...

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  has had 29,693 commits made by 34 contributors
  representing 605,629 lines of code
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  is mostly written in C
  with a well-commented source code
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  has a well established, mature codebase
  maintained by nobody
  with stable Y-O-Y commits
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  took an estimated 166 years of effort (COCOMO model)
  starting with its first commit in July, 1996
  ending with its most recent commit almost 16 years ago