This is a requirement of this app, and it could also implicitly solve the unstable crawling issue (#5).

The current crawling strategy would cause that Sina refuses access to the non-public stock API for 5-60 minutes. Given that the API is the best way to retrieve required stock data at present, I would like to work out some workarounds to bypass the limitation or mitigate this issue.
Any good practice for crawling (e.g., rest for 10 seconds for every 10 queries)?
Anti-anti-crawling?
Online+offline?

The root cause is still under investigation.