Activating WAL mode for sqlite

I'm trying to activate WAL-mode by generating a[ custom migration file](https://orm.drizzle.team/docs/kit-custom-migrations), and adding this to it:
`PRAGMA journal_mode = WAL;`
Then, I'm running migrations as I usually do, programmatically. But when inspecting the .db file with the sqlite command-line tool, it says journal_mode is still 'delete'.

I'm using drizzle with better-sqlite3. Where am I going wrong?

A big thank you to everyone considering helping me out with this.