Laravel: Retrieving records with string ids breaks app

I have a Laravel app which serves as a backend API. I changed the ids from ints to strings in the comments table, so I could add some abbreviations to the id based on the model it belongs to. Meaning instead of a comment-row getting an id of 5 it gets an id of CMT-45876348.

But after making this change, my app has started to break. When I hit the pagination endpoint (which worked before), the logs in my Laravel terminal show outputs like these:

# PHP Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 40960 bytes) in \vendor\laravel\framework\src\Illuminate\Collections\Collection.php on line 1445
PHP Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 65536 bytes) in \vendor\composer\ClassLoader.php on line 576


or a different error message about the responsetime being too long.

I wanted to make sure it was because of these ids. So I kept all of the code the same but left the comments table empty and the app worked as normal. So I want to know how a simple id change can break that entire section of the app.

comments migration:

Schema::create('comments', function (Blueprint $table) {
$table->id();
$table->foreignId('parent_id')->nullable()->constrained('comments')->onDelete('cascade');

$table->string('id')->primary();

$table->string('parent_id')->nullable();
$table->foreign('parent_id')->references('id')->on('comments')->onDelete('cascade');

$table->foreignId('user_id')->nullable()->constrained()->onDelete('cascade');
$table->foreignId('post_id')->constrained()->onDelete('cascade');
$table->longText('content');


Comment model:

class Comment extends Model {
use HasFactory, softDeletes;

protected $primaryKey = 'id';
public $incrementing = false;

protected static function boot()
{
parent::boot();

static::creating(function ($comment) {
if (empty($comment->id)) {
$comment->id = IdGenerator::generate('comment');
}
});
}


Class used to generate the IDs:

class IdGenerator {

public static function generate(string $modelType): string
{
$prefix = self::getModelPrefix($modelType);

$timestamp = round(microtime(true) * 1000);

return $prefix . '-' . $timestamp;
}

/**
* Returns the model prefix based on the model type.
*
* @param string $modelType
* @return string
*/
private static function getModelPrefix(string $modelType): string
{
$modelPrefixMap = [
'user' => 'USR',
'post' => 'PST',
'comment' => 'CMT',
'like' => 'LIK',
'tag' => 'TAG',
];

return $modelPrefixMap[$modelType] ?? 'GEN';
}
}

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