User.php

<?php

namespace App;

use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;

class User extends Authenticatable
{
    use SoftDeletes;

    protected $fillable = [
        '*',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'expires_at' => 'datetime',
    ];

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function tokens(): HasMany
    {
        return $this->hasMany(Token::class);
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function entries(): HasMany
    {
        return $this->hasMany(Entry::class);
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function groups(): BelongsToMany
    {
        return $this->belongsToMany(Group::class);
    }

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

        static::deleting(static function (User $user) {
            // Detach all groups
            $user->groups()->detach();

            // Delete all tokens
            /** @var \App\Token $token */
            foreach ($user->tokens() as $token) {
                $token->delete();
            }

            /** @var \App\Entry $entry */
            foreach ($user->entries() as $entry) {
                $entry->delete();
            }
        });
    }
}