fix error described in issue #1940 by making all tokens DEFAULT ''

[macMikey]

fix: make all auth.users tokens fields default empty

fix error authenticating users created via sql functions. the issue causes token generation to fail during the user lookup due to an sql error

#1940

[angelodias-appno]

I had to do more changes to make this work, mainly dropping NOT NULL and adding a field in set default.

Suggested change

	BEGIN;
	ALTER TABLE auth.users
	ALTER COLUMN confirmation_token SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN recovery_token SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN email_change_token_new SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN email_change SET DEFAULT '';
	COMMIT;
	BEGIN;
	ALTER TABLE auth.users
	ALTER COLUMN confirmation_token DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN recovery_token DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN email_change_token_new DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN email_change_token_current DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN email_change_sent_at DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN email_change DROP NOT NULL;
	ALTER TABLE auth.users
	ALTER COLUMN confirmation_token SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN recovery_token SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN email_change_token_new SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN email_change_token_current SET DEFAULT '';
	ALTER TABLE auth.users
	ALTER COLUMN email_change SET DEFAULT '';
	COMMIT;