Implemented the authenticated admin contact system.

app/Models/SupportConversation.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\SupportConversationFactory;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+
+#[Fillable(['user_id', 'category', 'subject', 'status', 'last_message_at'])]
+class SupportConversation extends Model
+{
+    /** @use HasFactory<SupportConversationFactory> */
+    use HasFactory;
+
+    public const CATEGORY_BUG = 'bug';
+
+    public const CATEGORY_SUGGESTION = 'suggestion';
+
+    public const CATEGORY_CHANNEL_REQUEST = 'channel_request';
+
+    public const CATEGORY_OTHER = 'other';
+
+    public const STATUS_OPEN = 'open';
+
+    public const STATUS_CLOSED = 'closed';
+
+    /**
+     * @return array<string, string>
+     */
+    public static function categoryLabels(): array
+    {
+        return [
+            self::CATEGORY_BUG => 'Bug report',
+            self::CATEGORY_SUGGESTION => 'Suggestion',
+            self::CATEGORY_CHANNEL_REQUEST => 'Channel request',
+            self::CATEGORY_OTHER => 'Other',
+        ];
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public static function categories(): array
+    {
+        return array_keys(self::categoryLabels());
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public static function statuses(): array
+    {
+        return [
+            self::STATUS_OPEN,
+            self::STATUS_CLOSED,
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'last_message_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function messages(): HasMany
+    {
+        return $this->hasMany(SupportMessage::class);
+    }
+
+    public function latestMessage(): HasOne
+    {
+        return $this->hasOne(SupportMessage::class)->latestOfMany();
+    }
+
+    public function isOpen(): bool
+    {
+        return $this->status === self::STATUS_OPEN;
+    }
+}