M1: 数据模型 + sablog:import 脚本（MySQL 8 验证通过，不迁移 trackback 等过时功能）

app/Models/Setting.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Cache;
+
+class Setting extends Model
+{
+    protected $primaryKey = 'key';
+
+    public $incrementing = false;
+
+    protected $keyType = 'string';
+
+    protected $fillable = ['key', 'value'];
+
+    public const CACHE_KEY = 'blog.settings';
+
+    public static function get(string $key, mixed $default = null): mixed
+    {
+        $settings = self::allSettings();
+
+        return $settings[$key] ?? $default;
+    }
+
+    public static function set(string $key, mixed $value): void
+    {
+        self::updateOrCreate(['key' => $key], ['value' => is_scalar($value) || $value === null ? $value : json_encode($value)]);
+        self::flushCache();
+    }
+
+    public static function forget(string $key): void
+    {
+        self::where('key', $key)->delete();
+        self::flushCache();
+    }
+
+    public static function allSettings(): array
+    {
+        return Cache::remember(self::CACHE_KEY, now()->addDay(), function () {
+            return self::query()->pluck('value', 'key')->all();
+        });
+    }
+
+    public static function flushCache(): void
+    {
+        Cache::forget(self::CACHE_KEY);
+    }
+
+    public static function seedDefaults(array $defaults): void
+    {
+        foreach ($defaults as $key => $value) {
+            if (! self::query()->where('key', $key)->exists()) {
+                self::query()->create(['key' => $key, 'value' => $value]);
+            }
+        }
+        self::flushCache();
+    }
+}