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Добавил команды по генерации erd-диаграмм. В папку erd-diagrams добавил сгненерированные текущие схемы (в pdf и и png). Так как моделей немало и много связей, причем с созвучными названиями, то думаю наглядная схема немного упростит понимание контекста, особенно для вновь прибывающих на проект котрибьютеров.