Update Tag for all users

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Hi,

We have added a new group tag (app).

So for example a user data looks as following:

{
"named_user_id": "12b0-dbf9-41cd-844e-0ec8cf9731e6",
"tags": {
"notifications_setting": [
"enabled"
],
"app": [
"heed-fashion"
]
},
"created": "2017-03-01T17:10:26",
"last_modified": "2017-03-01T17:10:30",
"channels": []
}

From now on, this is a mandatory tag so each push request must contain corresponding filter (selector) with 'app' value.

We need to define a default value for all existing users (otherwise notifications will not work for existing users).

As I understand one way to implement it is:

1. Get all users using api/named_users

2. Set the default value per each user from 1

I am looking for a simpler way (as setting tag value for all users).

Any best practices for our case?

Thanks