[Unshallow] : Unshallow method needed to switch betweeen shallow and unshallow database queries

[folkien]

Is your proposal related to a problem?

After call to shallow() dictionary build_query is changed permamantly. Instead of changing internals of Database() object from outside it's better to have public method.

Describe the solution you'd like.

def unshallow() : 
if ('shallow' in self.build_query):
            del self.build_query['shallow']

Describe alternatives you've considered.

No response

Additional context.

No response

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