diff --git a/notebooks/03_Extraction.ipynb b/notebooks/03_Extraction.ipynb
index 9f2ec50..cebf785 100644
--- a/notebooks/03_Extraction.ipynb
+++ b/notebooks/03_Extraction.ipynb
@@ -24,7 +24,7 @@
     "\n",
     "data = \"../data/\"\n",
     "df = pd.read_csv(\"../data/psd_alldata.csv\", encoding=\"latin1\")\n",
-    "\"\"\"\n",
+    "\n",
     "df.rename(columns={\n",
     "    'Commodity_Description': 'commodity',\n",
     "    'Country_Name': 'country',\n",
@@ -115,8 +115,7 @@
     "                                   'Total Distribution', 'Ending Stocks', 'Net Supply',\n",
     "                                   'Supply-Demand Balance', 'Stock-to-Use Ratio (%)']]\n",
     "combined_global.to_csv(\"global_summary_all.csv\", index=False)\n",
-    "print(\"🌐 Combined global summary saved as 'global_summary_all.csv'\")\n",
-    "\"\"\""
+    "print(\"🌐 Combined global summary saved as 'global_summary_all.csv'\")\n"
    ]
   },
   {
diff --git a/transform/sqlmesh_materia/models/staging/stg_psd_alldata_1_filter_silver_layer.sql b/transform/sqlmesh_materia/models/staging/stg_psd_alldata_1_filter_silver_layer.sql
index e69de29..0d77482 100644
--- a/transform/sqlmesh_materia/models/staging/stg_psd_alldata_1_filter_silver_layer.sql
+++ b/transform/sqlmesh_materia/models/staging/stg_psd_alldata_1_filter_silver_layer.sql
@@ -0,0 +1,64 @@
+/*
+ * Silver layer: Pivots the raw PSD data into a wide format,
+ * with key attributes ('Production', 'Imports', etc.) as columns.
+ * This is equivalent to step 2 of the Python script 03_Extraction.
+ */
+MODEL (
+  name transform.sqlmesh_materia.models.staging.stg_psd_alldata_1_filter_silver_layer,
+  kind INCREMENTAL_BY_TIME_RANGE (
+    time_column ingest_date
+  ),
+  start '2006-08-01',
+  cron '@daily'
+);
+
+SELECT
+  commodity_code,
+  commodity_name,
+  country_code,
+  country_name,
+  ingest_date,
+  -- Replicate the Python script's pivot by using conditional aggregation
+  -- This creates a single row for each commodity-country-date combination
+  COALESCE(SUM(CASE WHEN attribute_name = 'Production' THEN value END), 0) AS Production,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Imports' THEN value END), 0) AS Imports,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Exports' THEN value END), 0) AS Exports,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Total Distribution' THEN value END), 0) AS Total_Distribution,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Ending Stocks' THEN value END), 0) AS Ending_Stocks,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Beginning Stocks' THEN value END), 0) AS Beginning_Stocks,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Total Supply' THEN value END), 0) AS Total_Supply,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Domestic Consumption' THEN value END), 0) AS Domestic_Consumption,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Domestic Demand' THEN value END), 0) AS Domestic_Demand,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Food Use' THEN value END), 0) AS Food_Use,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Industrial Use' THEN value END), 0) AS Industrial_Use,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Seed Use' THEN value END), 0) AS Seed_Use,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Waste' THEN value END), 0) AS Waste,
+  COALESCE(SUM(CASE WHEN attribute_name = 'Feed Use' THEN value END), 0) AS Feed_Use
+FROM transform.sqlmesh_materia.models.staging.stg_psd_alldata_0
+-- Filter for the specific attributes used in the pivot table for efficiency
+WHERE attribute_name IN (
+    'Production',
+    'Imports',
+    'Exports',
+    'Total Distribution',
+    'Ending Stocks',
+    'Beginning Stocks',
+    'Total Supply',
+    'Domestic Consumption',
+    'Domestic Demand',
+    'Food Use',
+    'Industrial Use',
+    'Seed Use',
+    'Waste',
+    'Feed Use'
+  )
+GROUP BY
+  commodity_code,
+  commodity_name,
+  country_code,
+  country_name,
+  ingest_date
+ORDER BY
+  commodity_name,
+  country_name,
+  ingest_date;
\ No newline at end of file
diff --git a/transform/sqlmesh_materia/models/staging/stg_psd_alldata_2_filter_gold_layer.sql b/transform/sqlmesh_materia/models/staging/stg_psd_alldata_2_filter_gold_layer.sql
index e69de29..ccf5ca7 100644
--- a/transform/sqlmesh_materia/models/staging/stg_psd_alldata_2_filter_gold_layer.sql
+++ b/transform/sqlmesh_materia/models/staging/stg_psd_alldata_2_filter_gold_layer.sql
@@ -0,0 +1,110 @@
+/*
+ * Gold layer: Calculates derived metrics like Net Supply, Trade Balance,
+ * and Stock-to-Use Ratio based on the pivoted silver layer data.
+ * This also includes the global aggregates, mimicking steps 3 and 4
+ * of the Python script 03_Extraction.
+ */
+MODEL (
+  name transform.sqlmesh_materia.models.staging.stg_psd_alldata_2_filter_gold_layer,
+  kind INCREMENTAL_BY_TIME_RANGE (
+    time_column ingest_date
+  ),
+  start '2006-08-01',
+  cron '@daily'
+);
+
+-- CTE to calculate country-level derived metrics
+WITH country_metrics AS (
+  SELECT
+    commodity_code,
+    commodity_name,
+    country_code,
+    country_name,
+    ingest_date,
+    Production,
+    Imports,
+    Exports,
+    Total_Distribution,
+    Ending_Stocks,
+    -- Derived metrics per country, mirroring Python script
+    (Production + Imports - Exports) AS Net_Supply,
+    (Exports - Imports) AS Trade_Balance,
+    (Production + Imports - Exports) - Total_Distribution AS Supply_Demand_Balance,
+    -- Handle division by zero for Stock-to-Use Ratio
+    (Ending_Stocks / NULLIF(Total_Distribution, 0)) * 100 AS Stock_to_Use_Ratio_pct,
+    -- Calculate Production YoY percentage change using a window function
+    (Production - LAG(Production, 1, 0) OVER (PARTITION BY commodity_code, country_code ORDER BY ingest_date)) / NULLIF(LAG(Production, 1, 0) OVER (PARTITION BY commodity_code, country_code ORDER BY ingest_date), 0) * 100 AS Production_YoY_pct
+  FROM transform.sqlmesh_materia.models.staging.stg_psd_alldata_1_filter_silver_layer
+),
+-- CTE to calculate global aggregates by summing up country-level data
+global_aggregates AS (
+  SELECT
+    commodity_code,
+    commodity_name,
+    NULL::TEXT AS country_code, -- Use NULL for global aggregates
+    'Global' AS country_name,
+    ingest_date,
+    SUM(Production) AS Production,
+    SUM(Imports) AS Imports,
+    SUM(Exports) AS Exports,
+    SUM(Total_Distribution) AS Total_Distribution,
+    SUM(Ending_Stocks) AS Ending_Stocks
+  FROM transform.sqlmesh_materia.models.staging.stg_psd_alldata_1_filter_silver_layer
+  GROUP BY
+    commodity_code,
+    commodity_name,
+    ingest_date
+),
+-- CTE to calculate derived metrics for global aggregates
+global_metrics AS (
+  SELECT
+    commodity_code,
+    commodity_name,
+    country_code,
+    country_name,
+    ingest_date,
+    Production,
+    Imports,
+    Exports,
+    Total_Distribution,
+    Ending_Stocks,
+    (Production + Imports - Exports) AS Net_Supply,
+    (Exports - Imports) AS Trade_Balance,
+    (Production + Imports - Exports) - Total_Distribution AS Supply_Demand_Balance,
+    (Ending_Stocks / NULLIF(Total_Distribution, 0)) * 100 AS Stock_to_Use_Ratio_pct,
+    (Production - LAG(Production, 1, 0) OVER (PARTITION BY commodity_code ORDER BY ingest_date)) / NULLIF(LAG(Production, 1, 0) OVER (PARTITION BY commodity_code ORDER BY ingest_date), 0) * 100 AS Production_YoY_pct
+  FROM global_aggregates
+)
+-- Combine country-level and global-level data into a single output
+SELECT
+  hkey,
+  commodity_code,
+  commodity_name,
+  country_code,
+  country_name,
+  ingest_date,
+  Production,
+  Imports,
+  Exports,
+  Total_Distribution,
+  Ending_Stocks,
+  Net_Supply,
+  Trade_Balance,
+  Supply_Demand_Balance,
+  Stock_to_Use_Ratio_pct,
+  Production_YoY_pct
+FROM (
+  SELECT
+    @GENERATE_SURROGATE_KEY(commodity_code, country_code, ingest_date) AS hkey,
+    *
+  FROM country_metrics
+  UNION ALL
+  SELECT
+    @GENERATE_SURROGATE_KEY(commodity_code, country_name, ingest_date) AS hkey,
+    *
+  FROM global_metrics
+) AS combined_data
+ORDER BY
+  commodity_name,
+  country_name,
+  ingest_date;
\ No newline at end of file