def METHOD_NAME(apps, schema_editor):
    """
    Add a database default of false for sent_welcome_email, for PostgreSQL and SQLite3
    Note: set sent_welcome_email = true for existing users
    Using `./manage.py sqlmigrate` for the SQL, and the technique from:
    https://stackoverflow.com/a/45232678/10612
    """
    if schema_editor.connection.vendor.startswith("postgres"):
        schema_editor.execute(
            'ALTER TABLE "emails_profile"'
            ' ALTER COLUMN "sent_welcome_email" SET DEFAULT false;'
        )
        # Set all existing profiles to true so we don't send them another welcome email
        schema_editor.execute(
            'UPDATE "emails_profile"' ' SET "sent_welcome_email" = true;'
        )
    elif schema_editor.connection.vendor.startswith("sqlite"):
        schema_editor.execute(
            """
            CREATE TABLE "new__emails_profile" (
                "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
                "api_token" char(32) NOT NULL,
                "user_id" integer NOT NULL UNIQUE REFERENCES "auth_user" ("id") DEFERRABLE INITIALLY DEFERRED,
                "address_last_deleted" datetime NULL,
                "num_address_deleted" integer unsigned NOT NULL CHECK ("num_address_deleted" >= 0),
                "last_hard_bounce" datetime NULL,
                "last_soft_bounce" datetime NULL,
                "subdomain" varchar(63) NULL UNIQUE,
                "server_storage" bool NOT NULL,
                "num_email_blocked_in_deleted_address" integer unsigned NOT NULL CHECK ("num_email_blocked_in_deleted_address" >= 0),
                "num_email_forwarded_in_deleted_address" integer unsigned NOT NULL CHECK ("num_email_forwarded_in_deleted_address" >= 0),
                "num_email_spam_in_deleted_address" integer unsigned NOT NULL CHECK ("num_email_spam_in_deleted_address" >= 0),
                "onboarding_state" integer unsigned NOT NULL CHECK ("onboarding_state" >= 0),
                "last_account_flagged" datetime NULL,
                "date_subscribed" datetime NULL,
                "auto_block_spam" bool NOT NULL,
                "num_email_replied_in_deleted_address" integer unsigned NOT NULL CHECK ("num_email_replied_in_deleted_address" >= 0),
                "remove_level_one_email_trackers" bool NULL,
                "num_level_one_trackers_blocked_in_deleted_address" integer unsigned NULL CHECK ("num_level_one_trackers_blocked_in_deleted_address" >= 0),
                "store_phone_log" bool NOT NULL,
                "date_phone_subscription_checked" datetime NULL,
                "date_subscribed_phone" datetime NULL,
                "forwarded_first_reply" bool NOT NULL,
                "date_phone_subscription_end" datetime NULL,
                "date_phone_subscription_reset" datetime NULL,
                "date_phone_subscription_start" datetime NULL,
                "created_by" varchar(63) NULL,
                "sent_welcome_email" bool NULL
            );
        """
        )
        schema_editor.execute(
            'INSERT INTO "new__emails_profile"'
            ' ("id",'
            ' "api_token",'
            ' "user_id",'
            ' "address_last_deleted",'
            ' "num_address_deleted",'
            ' "last_hard_bounce",'
            ' "last_soft_bounce",'
            ' "subdomain",'
            ' "server_storage",'
            ' "num_email_blocked_in_deleted_address",'
            ' "num_email_forwarded_in_deleted_address",'
            ' "num_email_spam_in_deleted_address",'
            ' "onboarding_state",'
            ' "last_account_flagged",'
            ' "date_subscribed",'
            ' "auto_block_spam",'
            ' "num_email_replied_in_deleted_address",'
            ' "remove_level_one_email_trackers",'
            ' "num_level_one_trackers_blocked_in_deleted_address",'
            ' "store_phone_log",'
            ' "date_phone_subscription_checked",'
            ' "date_subscribed_phone",'
            ' "forwarded_first_reply",'
            ' "date_phone_subscription_end",'
            ' "date_phone_subscription_reset",'
            ' "date_phone_subscription_start",'
            ' "created_by",'
            ' "sent_welcome_email" '
            ")"
            " SELECT "
            ' "id",'
            ' "api_token",'
            ' "user_id",'
            ' "address_last_deleted",'
            ' "num_address_deleted",'
            ' "last_hard_bounce",'
            ' "last_soft_bounce",'
            ' "subdomain",'
            ' "server_storage",'
            ' "num_email_blocked_in_deleted_address",'
            ' "num_email_forwarded_in_deleted_address",'
            ' "num_email_spam_in_deleted_address",'
            ' "onboarding_state",'
            ' "last_account_flagged",'
            ' "date_subscribed",'
            ' "auto_block_spam",'
            ' "num_email_replied_in_deleted_address",'
            ' "remove_level_one_email_trackers",'
            ' "num_level_one_trackers_blocked_in_deleted_address",'
            ' "store_phone_log",'
            ' "date_phone_subscription_checked",'
            ' "date_subscribed_phone",'
            ' "forwarded_first_reply",'
            ' "date_phone_subscription_end",'
            ' "date_phone_subscription_reset",'
            ' "date_phone_subscription_start",'
            ' "created_by",'
            " true "
            ' FROM "emails_profile";'
        )
        schema_editor.execute('DROP TABLE "emails_profile";')
        schema_editor.execute(
            'ALTER TABLE "new__emails_profile" RENAME TO "emails_profile";'
        )
        schema_editor.execute(
            'CREATE INDEX "emails_profile_address_last_deleted_188d9e79" ON "emails_profile" ("address_last_deleted");'
        )
        schema_editor.execute(
            'CREATE INDEX "emails_profile_last_hard_bounce_fefe494f" ON "emails_profile" ("last_hard_bounce");'
        )
        schema_editor.execute(
            'CREATE INDEX "emails_profile_last_soft_bounce_642ab37d" ON "emails_profile" ("last_soft_bounce");'
        )
        schema_editor.execute(
            'CREATE INDEX "emails_profile_last_account_flagged_f40cbf85" ON "emails_profile" ("last_account_flagged");'
        )
    else:
        raise Exception(f'Unknown database vendor "{schema_editor.connection.vendor}"')