更新

backend/database/migrate_add_penalty_fields.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * 迁移脚本：为 ai_models 表添加 frequency_penalty / presence_penalty 字段（已存在则跳过）
+ * 用法: php database/migrate_add_penalty_fields.php
+ */
+
+$host = '127.0.0.1';
+$user = 'root';
+$pass = 'root';
+$port = 3306;
+$dbName = 'ai_chat';
+
+try {
+    $pdo = new PDO("mysql:host={$host};port={$port};dbname={$dbName};charset=utf8mb4", $user, $pass, [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+    ]);
+
+    $columns = [
+        'frequency_penalty' => "ALTER TABLE ai_models ADD COLUMN frequency_penalty DECIMAL(3,2) DEFAULT 0.00 COMMENT '频率惩罚，抑制模型重复输出' AFTER support_image",
+        'presence_penalty'  => "ALTER TABLE ai_models ADD COLUMN presence_penalty DECIMAL(3,2) DEFAULT 0.00 COMMENT '存在惩罚，抑制模型重复话题' AFTER frequency_penalty",
+    ];
+
+    foreach ($columns as $name => $sql) {
+        $exists = $pdo->query("SHOW COLUMNS FROM ai_models LIKE '{$name}'")->fetch();
+        if ($exists) {
+            echo "{$name} 字段已存在，跳过。\n";
+            continue;
+        }
+        $pdo->exec($sql);
+        echo "已添加 {$name} 字段。\n";
+    }
+} catch (PDOException $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+    exit(1);
+}