feat: Update admin dashboard to show registered user count and set default date range for NASA data download to current month

backend/app/api/user.py

@@ -1,14 +1,14 @@
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
-from sqlalchemy import select
+from sqlalchemy import select, func
 from typing import List
 from pydantic import BaseModel
 
 from app.database import get_db
 from app.models.db import User
 from app.services.auth import hash_password
-from app.services.auth_deps import get_current_user # To protect endpoints
+from app.services.auth_deps import get_current_user, get_current_admin_user # To protect endpoints
 
 router = APIRouter(prefix="/users", tags=["users"])
 
@@ -105,3 +105,16 @@ async def reset_user_password(
     await db.commit()
 
     return {"message": f"Password for user {user.username} has been reset."}
+
+@router.get("/count", response_model=dict)
+async def get_user_count(
+    db: AsyncSession = Depends(get_db),
+    current_admin_user: User = Depends(get_current_admin_user) # Ensure only admin can access
+):
+    """
+    Get the total count of registered users.
+    """
+    result = await db.execute(select(func.count(User.id)))
+    total_users = result.scalar_one()
+    return {"total_users": total_users}
+

frontend/src/pages/admin/Dashboard.tsx

@@ -1,10 +1,33 @@
 /**
  * Dashboard Page
  */
-import { Card, Row, Col, Statistic } from 'antd';
-import { DatabaseOutlined, GlobalOutlined, RocketOutlined } from '@ant-design/icons';
+import { Card, Row, Col, Statistic, message } from 'antd';
+import { GlobalOutlined, RocketOutlined, UserOutlined } from '@ant-design/icons';
+import { useEffect, useState } from 'react';
+import { request } from '../../utils/request';
 
 export function Dashboard() {
+  const [totalUsers, setTotalUsers] = useState<number | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    const fetchUserCount = async () => {
+      try {
+        setLoading(true);
+        // Assuming '/users/count' is the new endpoint we just created in the backend
+        const response = await request.get('/users/count');
+        setTotalUsers(response.data.total_users);
+      } catch (error) {
+        console.error('Failed to fetch user count:', error);
+        message.error('无法获取用户总数');
+        setTotalUsers(0); // Set to 0 or handle error display
+      } finally {
+        setLoading(false);
+      }
+    };
+    fetchUserCount();
+  }, []); // Run once on mount
+
   return (
     <div>
       <h1>控制台</h1>
@@ -13,7 +36,7 @@ export function Dashboard() {
           <Card>
             <Statistic
               title="天体总数"
-              value={18}
+              value={18} // Currently hardcoded
               prefix={<GlobalOutlined />}
             />
           </Card>
@@ -22,7 +45,7 @@ export function Dashboard() {
           <Card>
             <Statistic
               title="探测器"
-              value={7}
+              value={7} // Currently hardcoded
               prefix={<RocketOutlined />}
             />
           </Card>
@@ -30,13 +53,14 @@ export function Dashboard() {
         <Col span={8}>
           <Card>
             <Statistic
-              title="数据记录"
-              value={1245}
-              prefix={<DatabaseOutlined />}
+              title="注册用户数"
+              value={totalUsers !== null ? totalUsers : '-'}
+              loading={loading}
+              prefix={<UserOutlined />}
             />
           </Card>
         </Col>
       </Row>
     </div>
   );
-}
+}

frontend/src/pages/admin/NASADownload.tsx

@@ -56,8 +56,8 @@ export function NASADownload() {
   const [bodies, setBodies] = useState<GroupedBodies>({});
   const [selectedBodies, setSelectedBodies] = useState<string[]>([]);
   const [dateRange, setDateRange] = useState<[Dayjs, Dayjs]>([
-    dayjs().subtract(1, 'month').startOf('month'),
-    dayjs().subtract(1, 'month').endOf('month')
+    dayjs().startOf('month'),
+    dayjs().endOf('month')
   ]);
   const [availableDates, setAvailableDates] = useState<Set<string>>(new Set());
   const [loadingDates, setLoadingDates] = useState(false);