Set-FileGroupSpecification.ps1

#requires -Version 2.0
param(
    [Parameter(Mandatory=$true)]
    [string]
    $databaseRootDirectory
)
$ErrorActionPreference = 'Stop'
Set-StrictMode -Version 'Latest'

$fileGroupSpecification = "ON [PRIMARY]"
$fileGroupSpecificationPattern = "ON \[PRIMARY\]"

function Test-FileGroupSpecification {
    param(
        [Parameter(Mandatory=$true)]
        [string]
        $tablePath
    )

    Get-ChildItem $tablePath -Recurse -File -Exclude *table.sql | foreach {
        $content = Get-Content $_.PSPath | Out-String   
        if ($content -match $fileGroupSpecificationPattern ) { 
            return $true
        }
    }
    
    return $false   
}

$tableScripts = Get-ChildItem $databaseRootDirectory -Recurse -Filter *.table.sql

$tableScripts | foreach {
    $content = Get-Content $_.PSPath | Out-String
    
    if ($content -match $fileGroupSpecificationPattern) {        
        if (Test-FileGroupSpecification $_.PSParentPath) {
            $updatedContent = $content.Replace($fileGroupSpecification, '')
            Set-Content $tableFilePath -Value $updatedContent                        
        }     
    }
}

This gist is intended to work on the file structure of a .table.sql file with a separate file for the indexes. It will not resolve where indexes are stored in the table file at this point.