feat(inventory): classify future concrete instances at database level

api-v3/src/database/migrations/1790087100000-f5-inventory-physical-instance.ts

@@ -15,11 +15,40 @@ export class F5InventoryPhysicalInstance1790087100000 implements MigrationInterf
     `);
     await queryRunner.query(`
       COMMENT ON COLUMN assets.is_inventory_instance IS
-      'True only for a concrete inventory instance confirmed/created as a real field object. Structural/context/catalog assets remain false.'
+      'True only for a concrete Inventory instance. Company, Area, Yacimiento and historical/context records remain structural.'
+    `);
+
+    await queryRunner.query(`
+      CREATE OR REPLACE FUNCTION classify_new_asset_inventory_instance()
+      RETURNS trigger
+      LANGUAGE plpgsql
+      AS $$
+      DECLARE
+        role_value varchar;
+        type_code varchar;
+      BEGIN
+        SELECT operational_role, lower(code)
+        INTO role_value, type_code
+        FROM asset_types
+        WHERE id = NEW.asset_type_id;
+
+        NEW.is_inventory_instance :=
+          role_value = 'GENERIC'
+          AND COALESCE(type_code, '') NOT IN ('area', 'yacimiento', 'empresa', 'company');
+        RETURN NEW;
+      END;
+      $$
+    `);
+    await queryRunner.query(`
+      CREATE TRIGGER trg_assets_classify_inventory_instance
+      BEFORE INSERT ON assets
+      FOR EACH ROW EXECUTE FUNCTION classify_new_asset_inventory_instance()
     `);
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query('DROP TRIGGER IF EXISTS trg_assets_classify_inventory_instance ON assets');
+    await queryRunner.query('DROP FUNCTION IF EXISTS classify_new_asset_inventory_instance()');
     await queryRunner.query('DROP INDEX IF EXISTS idx_assets_inventory_instance_active');
     await queryRunner.query('ALTER TABLE assets DROP COLUMN IF EXISTS is_inventory_instance');
   }