id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
461237618,MDU6SXNzdWU0NjEyMzc2MTg=,31,Mechanism for adding multiple foreign key constraints at once,9599,closed,0,,,0,2019-06-27T00:04:30Z,2019-06-29T06:27:40Z,2019-06-29T06:27:40Z,OWNER,,"Needed by [db-to-sqlite](https://github.com/simonw/db-to-sqlite). It currently works by collecting all of the foreign key relationships it can find and then applying them at the end of the process.

The problem is, the `add_foreign_key()` method looks like this:

https://github.com/simonw/sqlite-utils/blob/86bd2bba689e25f09551d611ccfbee1e069e5b66/sqlite_utils/db.py#L498-L516

That means it's doing a full `VACUUM` for every single relationship it sets up - and if you have hundreds of foreign key relationships in your database this can take hours.

I think the right solution is to have a `.add_foreign_keys(list_of_args)` method which does the bulk operation and then a single `VACUUM`. `.add_foreign_key(...)` can then call the bulk action with a single list item.",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/31/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed