optimizations

app/Models/CollectionProgramAssignment.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class CollectionProgramAssignment extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'collection_id',
+        'program_key',
+        'campaign_key',
+        'placement_scope',
+        'starts_at',
+        'ends_at',
+        'priority',
+        'notes',
+        'created_by_user_id',
+    ];
+
+    protected $casts = [
+        'starts_at' => 'datetime',
+        'ends_at' => 'datetime',
+        'priority' => 'integer',
+    ];
+
+    public function collection(): BelongsTo
+    {
+        return $this->belongsTo(Collection::class);
+    }
+
+    public function creator(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'created_by_user_id');
+    }
+}