feat[BE]: enhance expense management with location and project flock integration, including updates to migrations, entities, services, and validations

internal/database/migrations/20251227100000_update_expense_table.down.sql

@@ -0,0 +1,24 @@
+-- Rollback: Update expense and expense_nonstocks tables
+
+-- Drop indexes
+DROP INDEX IF EXISTS idx_expenses_project_flock_id;
+DROP INDEX IF EXISTS idx_expenses_location_id;
+
+-- Drop Foreign Key constraint
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM pg_constraint
+        WHERE conname = 'fk_expenses_location_id'
+    ) THEN
+        ALTER TABLE expenses
+            DROP CONSTRAINT fk_expenses_location_id;
+    END IF;
+END $$;
+
+-- Drop columns from expenses table
+ALTER TABLE expenses
+DROP COLUMN IF EXISTS project_flock_id;
+
+ALTER TABLE expenses
+DROP COLUMN IF EXISTS location_id;