Allow to use Exclude with range
For example\, the fiscal year overlaps check could be rewritten using an Exclude constraint with the range type \[1\]\. \
The problem is that sqlite does not have the range type \(nor the overlap operator\)\. Indeed range type is specific to PostgreSQL\. \
But the overlap constraint is a common need for resource planning so I think we should have tools for that\. \
I think it must be possible to create an python\-sql Operator to use in Exclude that will be converted into a composed where clause for backend that does not support range\. \
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\[1\] https\:\/\/stackoverflow\.com\/a\/46580467\/3541219
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