How to ensure all db operations in a same transaction?

[formingform]

I tried to implement a fetcher to filter my contract events, and I'll import the events to db like this:

Chain.import(events_data)

But, before to import events to db, I'll do something else and update my business tables, so, how can I ensure "import events" and "update business tables" in a same transaction?

Thanks.

[sl1depengwyn]

In blockscout we do it like this https://hexdocs.pm/ecto/Ecto.Multi.html

[formingform]

thanks