feat: update time tooltip.

server/routes/calendar.js

@@ -7,7 +7,7 @@ router.get('/', (req, res) => {
   const userId = req.user.userId;
 
   db.all(
-    'SELECT date, status FROM calendar_marks WHERE user_id = ?',
+    'SELECT date, status, updated_at FROM calendar_marks WHERE user_id = ?',
     [userId],
     (err, rows) => {
       if (err) {
@@ -16,7 +16,10 @@ router.get('/', (req, res) => {
 
       const markedDates = {};
       rows.forEach((row) => {
-        markedDates[row.date] = row.status;
+        markedDates[row.date] = {
+          status: row.status,
+          updatedAt: row.updated_at
+        };
       });
 
       res.json({ success: true, markedDates });
@@ -32,18 +35,54 @@ router.post('/', (req, res) => {
     return res.status(400).json({ success: false, error: '无效的数据格式' });
   }
 
+  // Helper function to get current timestamp in ISO format (UTC)
+  const getLocalTimestamp = () => {
+    return new Date().toISOString();
+  };
+
   const dbOperations = Object.entries(markedDates).map(([date, status]) => {
     return new Promise((resolve, reject) => {
-      db.run(
-        `INSERT INTO calendar_marks (user_id, date, status, updated_at)
-         VALUES (?, ?, ?, CURRENT_TIMESTAMP)
-         ON CONFLICT(user_id, date) DO UPDATE SET
-         status = excluded.status,
-         updated_at = CURRENT_TIMESTAMP`,
-        [userId, date, status],
-        (err) => {
-          if (err) reject(err);
-          else resolve();
+      // First check if this date exists and if status has changed
+      db.get(
+        'SELECT status FROM calendar_marks WHERE user_id = ? AND date = ?',
+        [userId, date],
+        (err, row) => {
+          if (err) {
+            return reject(err);
+          }
+          
+          // Only update timestamp if status changed or it's a new entry
+          const statusChanged = !row || row.status !== status;
+          
+          if (statusChanged) {
+            // Status changed - update with new timestamp
+            const currentTimestamp = getLocalTimestamp();
+            db.run(
+              `INSERT INTO calendar_marks (user_id, date, status, updated_at)
+               VALUES (?, ?, ?, ?)
+               ON CONFLICT(user_id, date) DO UPDATE SET
+               status = excluded.status,
+               updated_at = excluded.updated_at`,
+              [userId, date, status, currentTimestamp],
+              (err) => {
+                if (err) reject(err);
+                else resolve();
+              }
+            );
+          } else {
+            // Status unchanged - keep existing timestamp
+            db.run(
+              `INSERT INTO calendar_marks (user_id, date, status, updated_at)
+               VALUES (?, ?, ?, (SELECT updated_at FROM calendar_marks WHERE user_id = ? AND date = ?))
+               ON CONFLICT(user_id, date) DO UPDATE SET
+               status = excluded.status`,
+              [userId, date, status, userId, date],
+              (err) => {
+                if (err) reject(err);
+                else resolve();
+              }
+            );
+          }
         }
       );
     });