fitness/app/Models/WorkoutSessionItem.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class WorkoutSessionItem extends Model
{
    use HasFactory;

    protected $fillable = [
        'session_id',
        'workout_exercise_id',
        'done',
        'exercise_ms',
        'rest_ms',
        'actual_weight',
        'actual_reps',
    ];

    protected $casts = [
        'done' => 'boolean',
        'exercise_ms' => 'integer',
        'rest_ms' => 'integer',
        'actual_weight' => 'decimal:2',
        'actual_reps' => 'integer',
    ];

    public function session(): BelongsTo
    {
        return $this->belongsTo(WorkoutSession::class, 'session_id');
    }

    public function workoutExercise(): BelongsTo
    {
        return $this->belongsTo(WorkoutExercise::class);
    }
}