diff --git a/transform/sqlmesh_materia/config.yaml b/transform/sqlmesh_materia/config.yaml
index b9fe0de..93c60b3 100644
--- a/transform/sqlmesh_materia/config.yaml
+++ b/transform/sqlmesh_materia/config.yaml
@@ -17,15 +17,12 @@ gateways:
 default_gateway: prod
 
 # --- Catalog Configuration ---
-# Configure the Iceberg catalog endpoint
+# Attach R2 Iceberg catalog and configure default schema
 # https://sqlmesh.readthedocs.io/en/stable/reference/configuration/#execution-hooks
+# https://developers.cloudflare.com/r2/data-catalog/config-examples/duckdb/
 
 before_all:
-  - |
-    ATTACH '{{ env_var("R2_WAREHOUSE_NAME", "materia") }}' AS catalog (
-        TYPE ICEBERG,
-        ENDPOINT '{{ env_var("ICEBERG_REST_URI") }}'
-    );
+  - "ATTACH '{{ env_var('R2_WAREHOUSE_NAME', 'materia') }}' AS catalog (TYPE ICEBERG, ENDPOINT '{{ env_var('ICEBERG_REST_URI') }}', SECRET r2_secret);"
   - CREATE SCHEMA IF NOT EXISTS catalog.materia;
   - USE catalog.materia;