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previously i had `username` OR `email address` be a unique identifier. now we only want `email` to be unique

our identity schema is
```"identity.email.schema.json": |
          ....
              "properties": {
                "username": {
                  "title": "Username",
                  "type": "string",
                  "<http://ory.sh/kratos|ory.sh/kratos>": {
                    "credentials": {
                      "password": {
                        "identifier": true
                      }
                    },
                    "verification": {
                      "via": "email"
                    },
                    "recovery": {
                      "via": "email"
                    }
                  }
                },```
is deleting the `<http://ory.sh/kratos|ory.sh/kratos>` json from this and redploying the helm chart sufficient, or would we have to go into the DB and remove unique constraints etc?