修改限速

backend/app/aggregator.py

@@ -85,12 +85,36 @@ async def _fetch_symbol_stats(
             return None
 
 
+async def _pick_candidate_symbols(symbols: list[str]) -> list[str]:
+    """用 24h ticker 成交额预筛，避免对全市场并发拉 K 线触发 418 封禁。"""
+    try:
+        tickers = await binance_client.get_24hr_tickers()
+        vol_map = {
+            t["symbol"]: float(t.get("quoteVolume", 0) or 0)
+            for t in tickers
+            if t.get("symbol") in symbols
+        }
+        ranked = sorted(symbols, key=lambda s: vol_map.get(s, 0.0), reverse=True)
+        pool = min(settings.candidate_pool, len(ranked))
+        picked = ranked[:pool]
+        logger.info(
+            "Candidate pool: %d / %d symbols (by 24h quoteVolume)",
+            len(picked),
+            len(symbols),
+        )
+        return picked
+    except Exception as e:
+        logger.warning("24hr ticker prescreen failed, using full list: %s", e)
+        return symbols
+
+
 async def aggregate_period(
     start: datetime,
     end: datetime,
     use_live_prices: bool = False,
 ) -> list[dict]:
     symbols = await binance_client.get_usdt_perpetual_symbols()
+    candidates = await _pick_candidate_symbols(symbols)
     start_ms = to_ms(start)
     end_ms = to_ms(end)
 
@@ -103,8 +127,15 @@ async def aggregate_period(
 
     sem = asyncio.Semaphore(settings.max_concurrency)
     tasks = [
-        _fetch_symbol_stats(s, start_ms, end_ms, prices, sem) for s in symbols
+        _fetch_symbol_stats(s, start_ms, end_ms, prices, sem) for s in candidates
     ]
+    logger.info(
+        "Aggregating period %s ~ %s (%d symbols, concurrency=%d)",
+        start.isoformat(),
+        end.isoformat(),
+        len(candidates),
+        settings.max_concurrency,
+    )
     results = await asyncio.gather(*tasks)
     stats = [r for r in results if r is not None and r.quote_volume > 0]
     stats.sort(key=lambda x: x.quote_volume, reverse=True)