Add separate kline.db and pre-seed small-account four-product K-lines on startup.

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

modules/market/kline_stream.py

@@ -17,7 +17,7 @@ from typing import Callable, Optional
 from zoneinfo import ZoneInfo
 
 from modules.market.kline_chart import fetch_market_klines, ths_to_sina_chart_symbol
-from modules.market.kline_store import is_cache_fresh, load_meta, ensure_kline_tables
+from modules.market.kline_store import connect_kline_db, is_cache_fresh, load_meta, ensure_kline_tables
 from modules.market.market_sessions import is_trading_session
 
 logger = logging.getLogger(__name__)
@@ -87,8 +87,10 @@ class KlineStreamHub:
         if is_trading_session() and sub.period in FAST_PERIODS:
             return True
         try:
-            from modules.core.db_conn import connect_db
-            conn = connect_db(db_path)
+            from modules.core.paths import KLINE_DB_PATH
+
+            db_path = db_path or KLINE_DB_PATH
+            conn = connect_kline_db(db_path)
             ensure_kline_tables(conn)
             meta = load_meta(conn, chart_sym, sub.period)
             conn.close()