I implemented something similar a while back (exists just as a portfolio demo now: subpinger (dot) interrupt (dot) sh).

If you want go for that sort of "live" feeling, you should consider implementing websocket streaming instead of HTTP polling, it will feel a lot nicer for users.

Are you actually ingesting certificates or are you just showing a stream of entries from different logs? I figure the former as nothing seems to be searchable -- and ingesting this data can get very expensive very quickly.

Nevertheless, cool project! I am constantly thinking about ways to turn CT log data into meaningful, actionable streams for others. If you'd be up for working on something together, give me a shout!