[massive store] Ensure temporary metadata table get dropped
even if there is some integrity errors while inserting entity values or setting
back index/constraints, or any other errors. In case of exception, rollback to
ensure we're not committing undesired intermediate state.
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*