cubicweb #2110234 dataimport : provide copy_from / execmany facilities [deprecated]

For massive data imports, cubicweb.dataimport provides a NoHookObjectStore that bypasses most of the hooks. cubicweb.dataimport could also provide a more optimized source that would :

  • record sql insert / update statements
  • flush them regularly with execmany or copy_from.

Pseudo-code would be :

This kind of things already exist for client projects.

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