Custom page design by users

[Aamu Padi]

I am planning on building a blogging site. In that, I would like to allow the users to customize there page using html tags and bootstrap.

1. How do I save the contents?

•         Save all the contents in the db?
  
•         Or create different html files and serve them?
  
•         Performance?
  

2. I was planning on using lxml for stripping dangerous codes( scripts/iframe).

•         Or should I use some other tool (bleach/BeautifulSoup) or way of stripping the content?
  

3. What other security measures I should be taking?

Your opinions and suggestions are very important. Could you please help me with making it possible. Thank you.