Studio: make grid checkbox rectangular and commit table changes

app/Models/RecItemPair.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * Item-item co-occurrence pair for behavior-based similarity.
+ *
+ * @property int         $a_artwork_id
+ * @property int         $b_artwork_id
+ * @property float       $weight
+ * @property \Carbon\Carbon $updated_at
+ *
+ * @property-read Artwork $artworkA
+ * @property-read Artwork $artworkB
+ */
+final class RecItemPair extends Model
+{
+    protected $table = 'rec_item_pairs';
+
+    public $incrementing = false;
+
+    public $timestamps = false;
+
+    protected $fillable = [
+        'a_artwork_id',
+        'b_artwork_id',
+        'weight',
+        'updated_at',
+    ];
+
+    protected $casts = [
+        'a_artwork_id' => 'integer',
+        'b_artwork_id' => 'integer',
+        'weight'       => 'double',
+        'updated_at'   => 'datetime',
+    ];
+
+    // ── Relations ──────────────────────────────────────────────────────────
+
+    public function artworkA(): BelongsTo
+    {
+        return $this->belongsTo(Artwork::class, 'a_artwork_id');
+    }
+
+    public function artworkB(): BelongsTo
+    {
+        return $this->belongsTo(Artwork::class, 'b_artwork_id');
+    }
+}