SUPABASE local development seed users table

I'm working on a SQL function to fill the auth.users table with a given number of rows for local development.
I manage to complete the creation function but I didn't find a way to handle password hash in encrypted_password column. I tried to manually register a user with, let's say 12345678 and hardcode the hash in all rows but as expected, it didn't work.
I was hoping to get a better understanding of the way supabase encrypts passwords and maybe find a way to mokcup a large number of users and still be able to login as any of them.
However, this is my scropt in case it helps:

BEGIN;

WITH user_values AS (
  SELECT
    uuid_generate_v4() AS id,
    uuid_generate_v4() AS instance_id,
    'authenticated' AS aud,
    'authenticated' AS role,
    (ROW_NUMBER() OVER ()) || '@gmail.com' AS email,
    '$2a$10$nc8ek4I97q1rDN6w3jKj8uUuKGF1fMlfKaD1GNPtYDwhW6IVzA39i' AS encrypted_password,
    now() AS email_confirmed_at,
    NULL::timestamp AS invited_at,
    '' AS confirmation_token,
    NULL::timestamp AS confirmation_sent_at,
    '' AS recovery_token,
    NULL::timestamp AS recovery_sent_at,
    '' AS email_change_token_new,
    '' AS email_change,
    NULL::timestamp AS email_change_sent_at,
    NULL::timestamp AS last_sign_in_at,
    '{"provider":"email","providers":["email"]}'::jsonb AS raw_app_meta_data,
    '{}'::jsonb AS raw_user_meta_data,
    0::boolean AS is_super_admin,
    '2022-10-04 03:41:27.391146+00'::timestamp AS created_at,
    '2022-10-04 03:41:27.391146+00'::timestamp AS updated_at,
    NULL AS phone,
    NULL::timestamp AS phone_confirmed_at,
    '' AS phone_change,
    '' AS phone_change_token,
    NULL::timestamp AS phone_change_sent_at,
    '' AS email_change_token_current,
    0 AS email_change_confirm_status,
    NULL::timestamp AS banned_until,
    '' AS reauthentication_token,
    NULL::timestamp AS reauthentication_sent_at
  FROM generate_series(1, 100)
),
inserted_users AS (
INSERT INTO auth.users (
  id,
  instance_id,
  aud,
  role,
  email,
  encrypted_password,
  email_confirmed_at,
  invited_at,
  confirmation_token,
  confirmation_sent_at,
  recovery_token,
  recovery_sent_at,
  email_change_token_new,
  email_change,
  email_change_sent_at,
  last_sign_in_at,
  raw_app_meta_data,
  raw_user_meta_data,
  is_super_admin,
  created_at,
  updated_at,
  phone,
  phone_confirmed_at,
  phone_change,
  phone_change_token,
  phone_change_sent_at,
  email_change_token_current,
  email_change_confirm_status,
  banned_until,
  reauthentication_token,
  reauthentication_sent_at
)

SELECT * FROM user_values RETURNING id, instance_id
)

INSERT INTO public.user_profile (
  id,
  created_at,
  avatar_url,
  username,
  country_id
)
SELECT
  id,
  now(),
  '',
  'USUARIO' || ROW_NUMBER() OVER (),
  20
FROM inserted_users;

COMMIT;

This function generates as many users as you want for the table auth.users, given a value in:

FROM generate_series(1, 100)

It will create a user with email {row}@gmail.com and the passsword you pass to:

crypt('password123', gen_salt('bf'))

Usefull for local development and testing

You can directly put the script into your seed.sql file if you're working locally, or run it with the SQL editor in the Supabase dashboard.

BEGIN;

WITH user_values AS (
  SELECT
    uuid_generate_v4() AS id,
    '00000000-0000-0000-0000-000000000000'::uuid AS instance_id,
    'authenticated' AS aud,
    'authenticated' AS role,
    (ROW_NUMBER() OVER ()) || '@gmail.com' AS email,
    crypt('password123', gen_salt('bf')) AS encrypted_password,
    now() AS email_confirmed_at,
    NULL::timestamp AS invited_at,
    '' AS confirmation_token,
    NULL::timestamp AS confirmation_sent_at,
    '' AS recovery_token,
    NULL::timestamp AS recovery_sent_at,
    '' AS email_change_token_new,
    '' AS email_change,
    NULL::timestamp AS email_change_sent_at,
    now()::timestamp AS last_sign_in_at,
    '{"provider":"email","providers":["email"]}'::jsonb AS raw_app_meta_data,
    '{}'::jsonb AS raw_user_meta_data,
    0::boolean AS is_super_admin,
    '2022-10-04 03:41:27.391146+00'::timestamp AS created_at,
    '2022-10-04 03:41:27.391146+00'::timestamp AS updated_at,
    NULL AS phone,
    NULL::timestamp AS phone_confirmed_at,
    '' AS phone_change,
    '' AS phone_change_token,
    NULL::timestamp AS phone_change_sent_at,
    '' AS email_change_token_current,
    0 AS email_change_confirm_status,
    NULL::timestamp AS banned_until,
    '' AS reauthentication_token,
    NULL::timestamp AS reauthentication_sent_at
  FROM generate_series(1, 100)
),
inserted_users AS (
INSERT INTO auth.users (
  id,
  instance_id,
  aud,
  role,
  email,
  encrypted_password,
  email_confirmed_at,
  invited_at,
  confirmation_token,
  confirmation_sent_at,
  recovery_token,
  recovery_sent_at,
  email_change_token_new,
  email_change,
  email_change_sent_at,
  last_sign_in_at,
  raw_app_meta_data,
  raw_user_meta_data,
  is_super_admin,
  created_at,
  updated_at,
  phone,
  phone_confirmed_at,
  phone_change,
  phone_change_token,
  phone_change_sent_at,
  email_change_token_current,
  email_change_confirm_status,
  banned_until,
  reauthentication_token,
  reauthentication_sent_at
)

SELECT * FROM user_values RETURNING id, instance_id
)

--(OPTINAL) Here you can inser the created users into another table

-- INSERT INTO public.user_profile (
--   id,
--   created_at,
--   username
-- )
-- SELECT
--   id,
--   now(),
--   'USUARIO' || ROW_NUMBER() OVER (),
-- FROM inserted_users;

COMMIT;

-- create test users
INSERT INTO
auth.users (
instance_id,
id,
aud,
role,
email,
encrypted_password,
email_confirmed_at,
recovery_sent_at,
last_sign_in_at,
raw_app_meta_data,
raw_user_meta_data,
created_at,
updated_at,
confirmation_token,
email_change,
email_change_token_new,
recovery_token
) (
select
'00000000-0000-0000-0000-000000000000',
uuid_generate_v4 (),
'authenticated',
'authenticated',
'user' || (ROW_NUMBER() OVER ()) || '@example.com',
crypt ('password123', gen_salt ('bf')),
current_timestamp,
current_timestamp,
current_timestamp,
'{"provider":"email","providers":["email"]}',
'{}',
current_timestamp,
current_timestamp,
'',
'',
'',
''
FROM
generate_series(1, 10)
);
-- test user email identities
INSERT INTO
auth.identities (
id,
user_id,
identity_data,
provider,
last_sign_in_at,
created_at,
updated_at
) (
select
uuid_generate_v4 (),
id,
format('{"sub":"%s","email":"%s"}', id::text, email)::jsonb,
'email',
current_timestamp,
current_timestamp,
current_timestamp
from
auth.users
);

This creates 10 users generate_series(1, 10)
Same passwords for all users. You may salt it if you prefer.
Here is the gist