Change Details

Implement the outcome of discussion ticket T90563: * introduce an additional column into the wbc_entity_usage table to track usage of different renderings of the page separately. * the value of that column should at least contain the target language for which the page was rendered. It may contain the full parser cache key. * the effect should we that we only purge the parser cache for a page if a cached rendering uses the modified data, instead of always puring when //any// language would be affected. * separate purging of individual renderings is currently not supported by the parser cache, but may be in the future.