Cut sequential D1 round trips on the hottest endpoints

CLAUDE.md

@@ -140,6 +140,7 @@ Tables use snake_case naming:
 - **CORS/Headers**: Requests to XMOJ mimic real browser headers for compatibility
 - **Captcha**: Cloudflare Turnstile used for post/reply creation
 - **Content Moderation**: AI model checks badge content for negative sentiment
+- **Round Trips**: Workers often run far from the D1 primary (APAC), so each query costs tens of milliseconds while SQL itself takes well under one. Avoid per-item/N+1 queries in loops: fold N+1 lookups into one SQL statement, use `batch()` for independent statements, and `Promise.all` for independent fetches (bounded, when user input sets how many); keep loops where each query depends on the previous result, such as cursor pagination
 - **Cron Jobs**: Daily cleanup of old read messages (5+ days) and expired sessions
 
 ### Language Note

Source/Database.ts

@@ -46,11 +46,11 @@ export class Database {
     }
   }
 
-  public async Insert(Table: string, Data: object): Promise<Result> {
+  public async Insert(Table: string, Data: object, OrReplace: boolean = false): Promise<Result> {
     if (readonly) {
       return new Result(false, "数据库只读模式，无法写入");
     }
-    let QueryString = "INSERT INTO `" + Table + "` (";
+    let QueryString = (OrReplace ? "INSERT OR REPLACE INTO `" : "INSERT INTO `") + Table + "` (";
     for (let i in Data) {
       QueryString += "`" + i + "`, ";
     }