ERD建设需要帮助 [英] Help Needed in ERD Building

问题描述

我正在开发我的学期项目，这是一个社交应用程序，用户可以为他们的订阅者发布他们的消息，视频，文章，民意调查和活动。

我在构建UML图表时完成了一半，但坚持在用户订阅包（基本，标准，专业版）的场景中，针对这些包，他们可以发布有限数量的帖子。用户可以升级他的账户，必须在包裹到期后的每30个日期重新订阅。

如果有人做过这类工作，请帮助或建议任何案例研究阅读。

I am working on My Semester Project that is a Social App For Users to Post their Messages, Videos, Articles, Polles and Event for their Subcribers.
I am done at half in building UML Diagrams, but stuck at the Scenario Where User Subscribe a package (basic, standard, Pro) and Against these packages they can post limited number of Posts. User Can Upgrade his account, has to resubscribe every 30 dates after expiry date of his package.
If any one has done this type of work please help or can suggest any case study for reading.

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