'datetime', 'checked_in_at' => 'datetime', 'status' => 'integer', ]; public function activity(): BelongsTo { return $this->belongsTo(Activity::class); } public function miniappUser(): BelongsTo { return $this->belongsTo(MiniappUser::class); } public function session(): BelongsTo { return $this->belongsTo(ActivitySession::class, 'activity_session_id'); } public function checkins(): HasMany { return $this->hasMany(ActivitySignupCheckin::class); } }