It has created module tables specific to the module(with its name). I have been deleting the tables manually, but not always this is going well. It is not recommended to delete them manually, however you can try dropping the module tables on a test project to test how it will go. Sitefinity has very complex table dependency and an entry from one table is affecting many others. For example creating a page does update sf_page_data as well as workflow, permissions, widgets, modules, shared content and so on.
It is better to clear the module entries from the configuration files. Check Security Config, VirtualPathConfig and WorkflowConfig.
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