dbt-selly/macros/get_custom_schema.sql

-- see https://docs.getdbt.com/docs/building-a-dbt-project/building-models/using-custom-schemas/#an-alternative-pattern-for-generating-schema-names
{% macro generate_schema_name(custom_schema_name, node) -%}
    {{ generate_schema_name_for_env(custom_schema_name, node) }}
{%- endmacro %}