-- Migration: remove device_local_row_id, rename columns, and update unique index.
-- Run this on hrms (production) before deploying the app that uses new column names.
-- Production still has: unique index (device_id, device_local_row_id) and column device_local_row_id.
--
-- Order: 1) Drop unique index  2) Drop column  3) Rename scan_time_utc  4) Rename received_at_utc  5) Add new unique key

USE hrms;

-- 1) Drop the unique index on (device_id, device_local_row_id)
ALTER TABLE lunch_order_transactions
  DROP INDEX ux_lunch_order_tx_device_device_local_row_id;

-- 2) Drop the column
ALTER TABLE lunch_order_transactions
  DROP COLUMN device_local_row_id;

-- 3) Rename scan_time_utc → scan_date
ALTER TABLE lunch_order_transactions
  CHANGE COLUMN scan_time_utc scan_date DATETIME(3) NOT NULL;

-- 4) Rename received_at_utc → received_date
ALTER TABLE lunch_order_transactions
  CHANGE COLUMN received_at_utc received_date DATETIME(3) NOT NULL DEFAULT (UTC_TIMESTAMP(3));

-- 5) Add new unique key so INSERT IGNORE still deduplicates (same site/device/card/time = one row)
ALTER TABLE lunch_order_transactions
  ADD UNIQUE KEY ux_lunch_order_tx_site_device_card_scan_date (
    site_id,
    device_id,
    card_id,
    scan_date
  );