Add clear-and-refetch for hub K-line cache.

Force refresh wipes the series in hub_kline.db before pulling from the exchange; add a Linux clear script and rename the UI button to 清库重拉.

Co-authored-by: Cursor <cursoragent@cursor.com>

hub_kline_store.py

@@ -196,6 +196,47 @@ def purge_1m_bar_cap(db_path: Path | None = None, *, max_bars: int | None = None
         conn.close()
 
 
+def clear_series_bars(
+    exchange_key: str,
+    symbol: str,
+    timeframe: str | None = None,
+    db_path: Path | None = None,
+) -> int:
+    """删除某交易所+币种 K 线（可指定周期）；用于清库后全量重拉。"""
+    init_db(db_path)
+    ex_k = (exchange_key or "").strip().lower()
+    sym = (symbol or "").strip().upper()
+    if not ex_k or not sym:
+        return 0
+    conn = _connect(db_path)
+    try:
+        if timeframe:
+            tf = normalize_chart_timeframe(timeframe)
+            cur = conn.execute(
+                "DELETE FROM ohlcv_bars WHERE exchange_key=? AND symbol=? AND timeframe=?",
+                (ex_k, sym, tf),
+            )
+        else:
+            cur = conn.execute(
+                "DELETE FROM ohlcv_bars WHERE exchange_key=? AND symbol=?",
+                (ex_k, sym),
+            )
+        return int(cur.rowcount or 0)
+    finally:
+        conn.close()
+
+
+def clear_all_bars(db_path: Path | None = None) -> int:
+    """清空 hub K 线库全部 OHLCV 行。"""
+    init_db(db_path)
+    conn = _connect(db_path)
+    try:
+        cur = conn.execute("DELETE FROM ohlcv_bars")
+        return int(cur.rowcount or 0)
+    finally:
+        conn.close()
+
+
 def purge_retention(db_path: Path | None = None) -> int:
     """按周期策略清理：5m/15m/1h/2h/4h 一年；1m 保留最近 N 根；1d/1w 不删。"""
     n = 0
@@ -479,6 +520,7 @@ def resolve_chart_bars(
     db_path: Path | None = None,
     force_refresh: bool = False,
     tail_refresh: bool = False,
+    clear_db: bool = False,
     limit: int | None = None,
     before_ms: int | None = None,
 ) -> dict[str, Any]:
@@ -488,6 +530,7 @@ def resolve_chart_bars(
     """
     init_db(db_path)
     purged = purge_retention(db_path)
+    cleared = 0
 
     sym = (symbol or "").strip().upper()
     ex_k = (exchange_key or "").strip().lower()
@@ -510,6 +553,9 @@ def resolve_chart_bars(
         need = min(need, 30)
     cutoff = history_cutoff_ms_for_storage(storage_tf, now_ms)
 
+    if clear_db and not is_history and not tail_refresh:
+        cleared = clear_series_bars(ex_k, sym, storage_tf, db_path)
+
     def load_display_rows() -> list[dict[str, Any]]:
         if is_history:
             rows = load_bars_before(ex_k, sym, storage_tf, int(before_ms), need, db_path)
@@ -706,6 +752,7 @@ def resolve_chart_bars(
         "candles": candles,
         "from_cache": from_cache,
         "fetched": fetched,
+        "cleared": cleared,
         "purged": purged,
         "price_tick": price_tick,
         "stale": bool(remote_err),