-- ============================================================
  -- Delete All Users from a Company
  -- Usage: Set @CompanyId to the target company's ID
  -- WARNING: This is a hard delete. Data cannot be recovered.
  -- ============================================================

  DECLARE @CompanyId INT = 1  -- <-- Change this to the target company ID

  BEGIN TRANSACTION;

  BEGIN TRY

      -- Get the user IDs to be deleted
      DECLARE @UserIds TABLE (Id NVARCHAR(450));
      INSERT INTO @UserIds
      SELECT Id FROM AspNetUsers WHERE CompanyId = @CompanyId;

      PRINT CONCAT('Users to be deleted: ', (SELECT COUNT(*) FROM @UserIds));

      -- 1. Delete Identity-related child records first
      DELETE FROM AspNetUserTokens   WHERE UserId IN (SELECT Id FROM @UserIds);
      DELETE FROM AspNetUserLogins   WHERE UserId IN (SELECT Id FROM @UserIds);
      DELETE FROM AspNetUserClaims   WHERE UserId IN (SELECT Id FROM @UserIds);
      DELETE FROM AspNetUserRoles    WHERE UserId IN (SELECT Id FROM @UserIds);

      -- 2. Nullify FK references in business tables (quotes, maintenance records)
      UPDATE Quotes
          SET PreparedById = NULL
          WHERE PreparedById IN (SELECT Id FROM @UserIds);

      UPDATE MaintenanceRecords
          SET PerformedById = NULL
          WHERE PerformedById IN (SELECT Id FROM @UserIds);

      -- 3. Delete the users
      DELETE FROM AspNetUsers WHERE Id IN (SELECT Id FROM @UserIds);

      PRINT 'Users deleted successfully.';

      COMMIT TRANSACTION;

  END TRY
  BEGIN CATCH
      ROLLBACK TRANSACTION;
      PRINT CONCAT('Error: ', ERROR_MESSAGE());
      THROW;
  END CATCH;