增加用户管理

flyway/migrations/V1__create_users_table.sql

@@ -0,0 +1,12 @@
+-- Create users table
+CREATE TABLE IF NOT EXISTS users (
+    id VARCHAR(32) PRIMARY KEY,
+    username VARCHAR(20) NOT NULL UNIQUE,
+    password VARCHAR(64) NOT NULL,
+    nickname VARCHAR(50) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Create index on username for faster lookups
+CREATE INDEX IF NOT EXISTS idx_users_username ON users(username);