feat: breathing exercise & profile

app/Models/BreathingExercise.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class BreathingExercise extends Model
+{
+    public $timestamps = false; // we handle created_at manually
+    protected $fillable = ['user_id', 'subject', 'duration', 'created_at'];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+}