function Remove-LegacyDatabaseUsers {
<#
.SYNOPSIS
    Remove the legacy database users (IIS App Pools) from the system

.PARAMETER ConnectionString
    The connection string of the database to cleanup

.PARAMETER DbName
    [Obsolete] The database name associated with this connection string
#>
    [CmdletBinding()]
    [OutputType([void])]
    param (
        $ConnectionString,
        $DbName
    )

    Confirm-DatabaseAccess $ConnectionString

    $sqlConnection = New-Object System.Data.SqlClient.SqlConnection $ConnectionString

    # The original passed in value is now obsolete, just use the one on the connection string now
    $DbName = $sqlConnection.Database

    if($DbName -match 'AlkamiMaster' -or $DbName -match 'DeveloperDynamic' ) {
        Write-Host "Cleaning crusty users from connection string: " $ConnectionString
    } else {
        # Only act on local Alkami databases
        return
    }

    $sqlConnection.Open()

    [System.Data.SqlClient.SqlCommand]$command = $sqlConnection.CreateCommand()
    $command.CommandText = "select [name] from [sys].[database_principals] where [type]='u' and [name]!='dbo';"
    [System.Data.SqlClient.SqlDataReader]$reader = $command.ExecuteReader()
    $DbNames = @()
    while ($reader.Read()) {
        $DbNames += $reader[0].ToString()
    }
    $reader.Dispose()

    # TODO: Should we death all users in AlkamiMaster and DeveloperDynamic no matter who they are?
    foreach ($account in (Get-SDKUserMatrix)) {
        # This will get rid of any IIS Users in the database
        # This does not get rid of the domain users in the database
        $username = $account.Username.Trim()
        if ($DbNames.Contains($username)) {
            [System.Data.SqlClient.SqlCommand]$command = $sqlConnection.CreateCommand()

            if($DbName -match 'AlkamiMaster' -or $DbName -match 'DeveloperDynamic' ) {
                $command.CommandText = "DROP USER [$username];"
            }
            else {
                $command.CommandText = "DROP LOGIN [$username];"
            }

            $command.ExecuteNonQuery() | Out-Null
            $command.Dispose()
        }
    }
    $sqlConnection.Dispose()
}