fix security issue #36564 (integrity error w/ RQLUniqueConstraint) by using a global lock serializing commit when some RQLUniqueConstraint is encountered.

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\.svn

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^build$

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^dist$

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\.pyc$

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\.pyo$

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\~$

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\#.*?\#$

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\.swp$

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^doc/book/en/apidoc$