cursor done.

server/database.js

@@ -0,0 +1,54 @@
+const sqlite3 = require('sqlite3').verbose();
+const { DB_PATH } = require('./config');
+
+const db = new sqlite3.Database(DB_PATH, (err) => {
+  if (err) {
+    console.error('数据库连接失败:', err.message);
+    process.exit(1);
+  }
+  console.log('已连接到 SQLite 数据库');
+});
+
+function initializeDatabase() {
+  db.serialize(() => {
+    db.run(`CREATE TABLE IF NOT EXISTS users (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      username TEXT UNIQUE NOT NULL,
+      password_hash TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+    )`);
+
+    db.run(`CREATE TABLE IF NOT EXISTS calendar_marks (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      user_id INTEGER NOT NULL,
+      date TEXT NOT NULL,
+      status TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      UNIQUE(user_id, date),
+      FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    )`);
+
+    db.run(`CREATE INDEX IF NOT EXISTS idx_user_date ON calendar_marks(user_id, date)`);
+  });
+}
+
+initializeDatabase();
+
+function closeDatabase() {
+  return new Promise((resolve) => {
+    db.close((err) => {
+      if (err) {
+        console.error('关闭数据库失败:', err.message);
+      } else {
+        console.log('数据库连接已关闭');
+      }
+      resolve();
+    });
+  });
+}
+
+module.exports = {
+  db,
+  closeDatabase
+};