shoc-backend/Data.SeaHavenIndustries/Migrations/20260713120000_Phase7_ExternalWorkOrderIdUnique.cs

using Data.SeaHavenIndustries;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace Data.SeaHavenIndustries.Migrations
{
    /// <inheritdoc />
    [DbContext(typeof(ApplicationDbContext))]
    [Migration("20260713120000_Phase7_ExternalWorkOrderIdUnique")]
    public partial class Phase7_ExternalWorkOrderIdUnique : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            // Idempotent: column may already be nvarchar(450) in some environments.
            migrationBuilder.Sql(@"
                IF COL_LENGTH('workOrders', 'ExternalWorkOrderId') IS NOT NULL
                   AND EXISTS (
                       SELECT 1
                       FROM sys.columns c
                       INNER JOIN sys.types t ON c.user_type_id = t.user_type_id
                       WHERE c.object_id = OBJECT_ID(N'dbo.workOrders')
                         AND c.name = N'ExternalWorkOrderId'
                         AND t.name = N'nvarchar'
                         AND c.max_length = -1)
                BEGIN
                    ALTER TABLE workOrders ALTER COLUMN ExternalWorkOrderId nvarchar(450) NULL;
                END
            ");

            migrationBuilder.Sql(@"
                IF NOT EXISTS (
                    SELECT 1 FROM sys.indexes
                    WHERE name = N'IX_workOrders_ExternalWorkOrderId'
                      AND object_id = OBJECT_ID(N'dbo.workOrders'))
                BEGIN
                    CREATE UNIQUE INDEX IX_workOrders_ExternalWorkOrderId
                        ON workOrders (ExternalWorkOrderId)
                        WHERE [ExternalWorkOrderId] IS NOT NULL AND [ExternalWorkOrderId] <> '';
                END
            ");
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.Sql(@"
                IF EXISTS (
                    SELECT 1 FROM sys.indexes
                    WHERE name = N'IX_workOrders_ExternalWorkOrderId'
                      AND object_id = OBJECT_ID(N'dbo.workOrders'))
                    DROP INDEX IX_workOrders_ExternalWorkOrderId ON workOrders;
            ");

            migrationBuilder.Sql(@"
                IF COL_LENGTH('workOrders', 'ExternalWorkOrderId') IS NOT NULL
                    ALTER TABLE workOrders ALTER COLUMN ExternalWorkOrderId nvarchar(max) NULL;
            ");
        }
    }
}