[repo] move repo stats to Service (closes #2951067) We currently add a new method on repo that anyone can call. Call service allows to reach the same result with: * Restricted access to manager only (thanks to selection on services), * Less unrelated code on the repo. * No need to fetch a reference to a repo object from client side. `req._cnx.repo` is not an API and config.repository() is on its way out. The old way to access this information (repo.stats()) is deprecated.

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from cubicweb.schemas.base import in_group, CWSourceSchemaConfig

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# copy __permissions__ to avoid modifying a shared dictionary

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in_group.__permissions__ = in_group.__permissions__.copy()

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in_group.__permissions__['read'] = ('managers',)

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cw_for_source = CWSourceSchemaConfig.get_relation('cw_for_source')

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cw_for_source.__permissions__ = {'read': ('managers', 'users'),

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                                 'add': ('managers',),

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                                 'delete': ('managers',)}

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