refactor: rename materia → beanflows throughout codebase

- Rename src/materia/ → src/beanflows/ (Python package)
- Rename transform/sqlmesh_materia/ → transform/sqlmesh_beanflows/
- Rename infra/supervisor/materia-supervisor.service → beanflows-supervisor.service
- Rename infra/backup/materia-backup.{service,timer} → beanflows-backup.{service,timer}
- Update all path strings: /opt/materia → /opt/beanflows, /data/materia → /data/beanflows
- Update pyproject.toml: project name, CLI entrypoint, workspace source key
- Update all internal imports from materia.* → beanflows.*
- Update infra scripts: REPO_DIR, service names, systemctl references
- Fix docker-compose.prod.yml: /data/materia → /data/beanflows (bind mount path)

Intentionally left unchanged: Pulumi stack name (materia-infrastructure) and
Hetzner resource names ("materia-key", "managed_by: materia") — these reference
live cloud infrastructure and require separate cloud-side renames.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

transform/sqlmesh_beanflows/models/serving/obt_commodity_metrics.sql

@@ -0,0 +1,126 @@
+MODEL (
+  name serving.commodity_metrics,
+  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,
+    market_year,
+    ingest_date,
+    Production,
+    Imports,
+    Exports,
+    Total_Distribution,
+    Ending_Stocks,
+    (
+      Production + Imports - Exports
+    ) AS Net_Supply, /* Derived metrics per country, mirroring Python script */
+    (
+      Exports - Imports
+    ) AS Trade_Balance,
+    (
+      Production + Imports - Exports
+    ) - Total_Distribution AS Supply_Demand_Balance,
+    (
+      Ending_Stocks / NULLIF(Total_Distribution, 0)
+    ) /* Handle division by zero for Stock-to-Use Ratio */ * 100 AS Stock_to_Use_Ratio_pct,
+    (
+      Production - LAG(Production, 1, 0) OVER (PARTITION BY commodity_code, country_code ORDER BY market_year, ingest_date)
+    ) /* Calculate Production YoY percentage change using a window function */ / NULLIF(
+      LAG(Production, 1, 0) OVER (PARTITION BY commodity_code, country_code ORDER BY market_year, ingest_date),
+      0
+    ) * 100 AS Production_YoY_pct
+  FROM cleaned.psdalldata__commodity_pivoted
+), global_aggregates AS (
+  SELECT
+    commodity_code,
+    commodity_name,
+    NULL::TEXT AS country_code, /* Use NULL for global aggregates */
+    'Global' AS country_name,
+    market_year,
+    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 cleaned.psdalldata__commodity_pivoted
+  GROUP BY
+    commodity_code,
+    commodity_name,
+    market_year,
+    ingest_date
+), global_metrics /* CTE to calculate derived metrics for global aggregates */ AS (
+  SELECT
+    commodity_code,
+    commodity_name,
+    country_code,
+    country_name,
+    market_year,
+    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 market_year, ingest_date)
+    ) / NULLIF(
+      LAG(Production, 1, 0) OVER (PARTITION BY commodity_code ORDER BY market_year, ingest_date),
+      0
+    ) * 100 AS Production_YoY_pct
+  FROM global_aggregates
+)
+/* Combine country-level and global-level data into a single output */
+SELECT
+  commodity_code,
+  commodity_name,
+  country_code,
+  country_name,
+  market_year,
+  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
+    *
+  FROM country_metrics
+  UNION ALL
+  SELECT
+    *
+  FROM global_metrics
+) AS combined_data
+ORDER BY
+  commodity_name,
+  country_name,
+  market_year,
+  ingest_date