completed story 1.1 with QA tests and fixes

app/Models/BlockedTime.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class BlockedTime extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'block_date',
+        'start_time',
+        'end_time',
+        'reason',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'block_date' => 'date',
+        ];
+    }
+
+    /**
+     * Check if this is a full day block.
+     */
+    public function isFullDay(): bool
+    {
+        return is_null($this->start_time) && is_null($this->end_time);
+    }
+}