Error: connect ECONNREFUSED ::1:443 with PostgreSQL and Next.js locally?

I have this defined in .env locally:

DATABASE_URL=postgresql://localhost:5432/mydb
POSTGRES_URL=postgresql://localhost:5432/mydb

I then have this kysely config (where DB is from codgen-kysely):

import 'dotenv/config'
import { createKysely } from '@vercel/postgres-kysely'
import { DB } from 'kysely-codegen'

export const db = createKysely<DB>()
export { sql } from 'kysely'

I then have a seed file at seeds/start.ts:

yarn ts-node -P tsconfig.cli.json seeds/start

/* eslint-disable @typescript-eslint/no-unsafe-argument */
import { db } from '../configurations/kysely'

seed()

async function seed() {
  db.insertInto('foo').values(...)
}

What I am getting though is:

$ yarn ts-node -P tsconfig.cli.json seeds/start
$ ./node_modules/.bin/ts-node -P tsconfig.cli.json seeds/start
The database host is 'localhost', which is the default host when none is set. If that's intentional, please ignore this warning. If not, perhaps an environment variable has not been set, or has not been passed to the library?
Error: connect ECONNREFUSED ::1:443
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1487:16) {
  errno: -61,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '::1',
  port: 443
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Why is it trying to connect to port 443 when I specified 5432 in the .env? Do I need to open up port 443 locally? That seems weird. How do I get around this locally?

I was able to run the kysely migrations fine, but not the seeds now, using the @vercel/postgres-kysely package.

Start with configurations/kysely and seeds/start, then inspect the environment loading used by ts-node -P tsconfig.cli.json. Compare the connection path used by the seed with the PostgreSQL settings shown in .env and the migrations that work. Done means the seed command connects to the intended local database instead of attempting ::1:443.