feat: track download logs (ip, browser, device, time)

backend/app/routes/admin.py

@@ -4,8 +4,8 @@ from fastapi import APIRouter, HTTPException, Depends, Query
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, func, or_
 from app.database import get_db
-from app.models import Video
-from app.schemas import VideoInfo, VideoListResponse, StorageStats
+from app.models import Video, DownloadLog
+from app.schemas import VideoInfo, VideoListResponse, StorageStats, DownloadLogInfo, DownloadLogListResponse
 from app.auth import get_current_user
 
 router = APIRouter(prefix="/api/admin", tags=["admin"])
@@ -68,3 +68,26 @@ async def storage_stats(user: dict = Depends(get_current_user), db: AsyncSession
     total = (await db.execute(select(func.count(Video.id)).where(Video.status == "done"))).scalar() or 0
     total_size = (await db.execute(select(func.sum(Video.file_size)).where(Video.status == "done"))).scalar() or 0
     return StorageStats(total_videos=total, total_size=total_size, total_size_human=human_size(total_size))
+
+
+@router.get("/download-logs", response_model=DownloadLogListResponse)
+async def download_logs(
+    page: int = Query(1, ge=1),
+    page_size: int = Query(50, ge=1, le=200),
+    video_id: int = Query(None),
+    user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    query = select(DownloadLog).order_by(DownloadLog.downloaded_at.desc())
+    count_query = select(func.count(DownloadLog.id))
+    if video_id is not None:
+        query = query.where(DownloadLog.video_id == video_id)
+        count_query = count_query.where(DownloadLog.video_id == video_id)
+    total = (await db.execute(count_query)).scalar() or 0
+    logs = (await db.execute(query.offset((page - 1) * page_size).limit(page_size))).scalars().all()
+    return DownloadLogListResponse(
+        logs=[DownloadLogInfo.model_validate(l) for l in logs],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )