first version

app/Models/CustomerLevelModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+/**
+ * 客户等级模型（同一商品按客户等级定价）
+ */
+class CustomerLevelModel extends Model
+{
+    use HasFactory;
+
+    /** 状态：停用 */
+    public const STATUS_DISABLED = 0;
+    /** 状态：正常 */
+    public const STATUS_NORMAL = 1;
+
+    protected $table = 'customer_level';
+    protected $primaryKey = 'id';
+
+    protected $fillable = [
+        'name',
+        'sort',
+        'status',
+        'remark',
+    ];
+
+    protected $casts = [
+        'sort' => 'integer',
+        'status' => 'integer',
+    ];
+
+    /**
+     * 该等级下的门店
+     */
+    public function stores(): HasMany
+    {
+        return $this->hasMany(StoreModel::class, 'level_id', 'id');
+    }
+
+    /**
+     * 该等级下的商品价格
+     */
+    public function prices(): HasMany
+    {
+        return $this->hasMany(ProductPriceModel::class, 'level_id', 'id');
+    }
+}