Add finance_excellent_rating_revenue model

dbt/models/marts/finance/finance_excellent_rating_revenue.sql

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+-- Finance model: product-level revenue breakdown for the Excellent rating cohort
+-- Excellent tier = avg_rating >= 4.5 as defined in dim_products
+-- Use this model to analyse which top-rated products drive the most revenue
+
+with excellent_cohort as (
+
+    select
+        product_id,
+        product_name,
+        product_category,
+        avg_rating,
+        rating_tier,
+        review_count,
+        positive_reviews,
+        negative_reviews,
+        total_units_sold,
+        unit_price,
+        unit_margin,
+        margin_pct,
+        product_total_revenue,
+        product_gross_profit
+
+    from {{ ref('dim_products') }}
+
+    where rating_tier = 'Excellent'
+
+)
+
+select
+    product_id,
+    product_name,
+    product_category,
+    avg_rating,
+    rating_tier,
+    review_count,
+    positive_reviews,
+    negative_reviews,
+    total_units_sold,
+    unit_price,
+    unit_margin,
+    margin_pct,
+    product_total_revenue,
+    product_gross_profit
+
+from excellent_cohort
+
+order by product_total_revenue desc