Thank you for your contribution. The code is a good example to teach how to use Steem Python.

1. You may want to define mysql access details somewhere outside the constructor of Database class, which is easier to configure and maintain.
2. There are some broad execeptions, which is in general a bad practice.
3. What are the risks of the database compromised and access tokens leaked?
4. verify_post may be better named to indicate its purpose e.g. is_new_post
5. You may want to check if a post has been upvoted already before voting it.

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