From db67c19e859c2b8b425ee64400f2f7b6bbf76a1a Mon Sep 17 00:00:00 2001
From: JianMiau <bir840124@gmail.com>
Date: Mon, 10 Aug 2026 15:22:35 +0800
Subject: [PATCH] =?UTF-8?q?=E8=87=AA=E5=8B=95=E6=94=BE=E5=AF=AC=E8=88=8A?=
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根本原因：
badminton 資料表是舊系統先建立的，battlecombination 欄位型別比 TEXT 小；ensureTable 的 CREATE TABLE IF NOT EXISTS 對已存在的資料表不會生效，跨區平衡後 6 隊 × 3 輪的 JSON 超過欄位長度，寫入時噴出「Data too long for column 'battlecombination'」。

影響：
- server 啟動後第一次資料庫操作會自動把 personnel 與 battlecombination 放寬成 TEXT，不需手動下 SQL
- ensureTable 加上 tableReady 旗標，每個 process 只檢查一次，不再每個 request 都跑 CREATE TABLE

修法：
新增 widenLegacyColumns 查詢 information_schema，欄位型別不是 TEXT 系列時執行 ALTER TABLE MODIFY 放寬，並以模組層旗標記憶檢查結果。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 server/server.mjs | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/server/server.mjs b/server/server.mjs
index 6d1646a..2ee7c30 100644
--- a/server/server.mjs
+++ b/server/server.mjs
@@ -240,7 +240,13 @@ app.listen(port, () => {
   }
 })
 
+let tableReady = false
+
 async function ensureTable(poolInstance, currentTableName) {
+  if (tableReady) {
+    return
+  }
+
   await poolInstance.execute(`
     CREATE TABLE IF NOT EXISTS \`${currentTableName}\` (
       time INT(11) NOT NULL,
@@ -249,6 +255,34 @@ async function ensureTable(poolInstance, currentTableName) {
       PRIMARY KEY (time)
     ) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci
   `)
+
+  await widenLegacyColumns(poolInstance, currentTableName)
+  tableReady = true
+}
+
+async function widenLegacyColumns(poolInstance, currentTableName) {
+  const [columns] = await poolInstance.execute(
+    `
+      SELECT COLUMN_NAME AS name, DATA_TYPE AS type
+      FROM information_schema.COLUMNS
+      WHERE TABLE_SCHEMA = DATABASE()
+        AND TABLE_NAME = ?
+        AND COLUMN_NAME IN ('personnel', 'battlecombination')
+    `,
+    [currentTableName],
+  )
+
+  for (const column of columns) {
+    if (['text', 'mediumtext', 'longtext'].includes(String(column.type).toLowerCase())) {
+      continue
+    }
+
+    const nullability = column.name === 'personnel' ? 'NOT NULL' : 'DEFAULT NULL'
+    await poolInstance.execute(
+      `ALTER TABLE \`${currentTableName}\` MODIFY \`${column.name}\` TEXT ${nullability}`,
+    )
+    console.log(`widened column ${column.name} to TEXT on \`${currentTableName}\``)
+  }
 }
 
 function buildLineFlexMessage(time, rounds) {