feat: Implement currency management with models, routes, and UI updates; add backfill script for existing records

scripts/migrations/20251021_add_currency_and_unit_fields.sql

@@ -0,0 +1,29 @@
+-- CalMiner Migration: add currency and unit metadata columns
+-- Date: 2025-10-21
+-- Purpose: align persisted schema with API changes introducing currency selection for
+--          CAPEX/OPEX costs and unit selection for consumption/production records.
+
+BEGIN;
+
+-- CAPEX / OPEX
+ALTER TABLE capex
+    ADD COLUMN currency_code VARCHAR(3) NOT NULL DEFAULT 'USD';
+
+ALTER TABLE opex
+    ADD COLUMN currency_code VARCHAR(3) NOT NULL DEFAULT 'USD';
+
+-- Consumption tracking
+ALTER TABLE consumption
+    ADD COLUMN unit_name VARCHAR(64);
+
+ALTER TABLE consumption
+    ADD COLUMN unit_symbol VARCHAR(16);
+
+-- Production output
+ALTER TABLE production_output
+    ADD COLUMN unit_name VARCHAR(64);
+
+ALTER TABLE production_output
+    ADD COLUMN unit_symbol VARCHAR(16);
+
+COMMIT;