feat: 补齐 spec 遗漏 — themes/history 接口 + cover_count/coverCount/daysSinceLastAppear

Co-Authored-By: Claude <noreply@anthropic.com>

backend/services/daily_collector.py

@@ -60,10 +60,12 @@ async def collect_daily(trade_date: str, dry_run: bool = False) -> dict:
 
     # 2. 核心股前100：按领涨股 f3 降序，去重（同一股票可能是多个题材领涨股）
     stock_map: dict[str, dict] = {}
+    theme_count: dict[str, int] = {}  # securityCode -> 覆盖题材数
     for t in themes:
         code = t.get("securityCode")
         if not code:
             continue
+        theme_count[code] = theme_count.get(code, 0) + 1
         if code not in stock_map or (t.get("f3") or 0) > (stock_map[code].get("f3") or 0):
             stock_map[code] = {
                 "stock_code": code,
@@ -86,8 +88,8 @@ async def collect_daily(trade_date: str, dry_run: bool = False) -> dict:
     try:
         for i, s in enumerate(core_stocks, start=1):
             conn.execute(
-                "INSERT OR IGNORE INTO daily_core_stocks (trade_date, stock_code, stock_name, f3, rank) VALUES (?,?,?,?,?)",
-                (trade_date, s["stock_code"], s["stock_name"], s["f3"], i),
+                "INSERT OR IGNORE INTO daily_core_stocks (trade_date, stock_code, stock_name, f3, cover_count, rank) VALUES (?,?,?,?,?,?)",
+                (trade_date, s["stock_code"], s["stock_name"], s["f3"], theme_count.get(s["stock_code"], 0), i),
             )
         # 核心股所属题材：从 themes 列表（含 securityCode/themeCode/themeName）中
         # 为每个核心股收集其全部所属题材，写入 daily_core_stock_themes