From 9057807ec19b59353e0cec5a87528b4532eea17c Mon Sep 17 00:00:00 2001
From: Jerry Yan <792602257@qq.com>
Date: Thu, 5 Feb 2026 02:17:58 +0800
Subject: [PATCH] =?UTF-8?q?fix(database):=20=E8=A7=A3=E5=86=B3=E6=95=B0?=
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- 为 logical_path 字段创建前缀索引以避免索引长度超限
- 添加注释说明 utf8mb4 下索引长度按字节计算的限制
- 提供后续优化建议：使用 hash 生成列方案替代 VARCHAR 索引
---
 scripts/db/data-management-init.sql | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/db/data-management-init.sql b/scripts/db/data-management-init.sql
index 677aa68..7090b1b 100644
--- a/scripts/db/data-management-init.sql
+++ b/scripts/db/data-management-init.sql
@@ -69,7 +69,9 @@ CREATE TABLE IF NOT EXISTS t_dm_dataset_files (
     updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
     FOREIGN KEY (dataset_id) REFERENCES t_dm_datasets(id) ON DELETE CASCADE,
     INDEX idx_dm_dataset (dataset_id),
-    INDEX idx_dm_dataset_logical_path (dataset_id, logical_path, version),
+    -- 说明：utf8mb4 下索引长度按字节计算（最长 3072 bytes）。logical_path=VARCHAR(1000) 参与联合索引会超限，
+    -- 这里改为前缀索引以保证初始化可执行；如需“完全避免 VARCHAR 参与索引”，建议改用 hash 生成列方案。
+    INDEX idx_dm_dataset_logical_path (dataset_id, logical_path(700), version),
     INDEX idx_dm_file_type (file_type),
     INDEX idx_dm_file_status (status),
     INDEX idx_dm_upload_time (upload_time)