html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/sqlite-utils/pull/32#issuecomment-506784912,https://api.github.com/repos/simonw/sqlite-utils/issues/32,506784912,MDEyOklzc3VlQ29tbWVudDUwNjc4NDkxMg==,9599,2019-06-28T15:55:13Z,2019-06-28T15:55:13Z,OWNER,"Documentation, to be added as a subsection of https://sqlite-utils.readthedocs.io/en/latest/python-api.html#adding-foreign-key-constraints

### Adding multiple foreign key constraints at once

The final step in adding a new foreign key to a SQLite database is to run VACUUM, to ensure the new foreign key is available in future introspection queries.

VACUUM against a large (multi-GB) database can take several minutes or longer. If you are adding multiple foreign keys using table.add_foreign_key(...) these can quickly add up.

Instead, you can use db.add_foreign_keys(...) to add multiple foreign keys within a single transaction. This method takes a list of four-tuples, each one specifying a table, column, other_table and other_column.

Here's an example adding two foreign keys at once:

    db.add_foreign_keys([
        (""dogs"", ""breed_id"", ""breeds"", ""id""),
        (""dogs"", ""home_town_id"", ""towns"", ""id"")
    ])

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