feat: 每日AI分析改造——定调摘要、环比快照、完整连板梯队带涨停原因、生成次数记账

backend/database.py

@@ -82,9 +82,19 @@ CREATE TABLE IF NOT EXISTS ai_reports (
   tools_used TEXT,
   model TEXT NOT NULL,
   tokens_used INTEGER,
+  generation_count INTEGER NOT NULL DEFAULT 1,
   created_at TEXT NOT NULL DEFAULT (datetime('now','localtime')),
+  updated_at TEXT,
   UNIQUE(trade_date, report_type)
 );
+
+CREATE TABLE IF NOT EXISTS daily_market_stats (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  trade_date TEXT NOT NULL,
+  payload TEXT NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now','localtime')),
+  UNIQUE(trade_date)
+);
 """
 
 
@@ -107,6 +117,16 @@ def init_db():
     conn = get_connection()
     conn.executescript(SCHEMA_SQL)
 
+    # 轻量迁移：为已存在的旧表补列（CREATE TABLE IF NOT EXISTS 不会更新旧表结构）
+    for alter_sql in (
+        "ALTER TABLE ai_reports ADD COLUMN generation_count INTEGER NOT NULL DEFAULT 1",
+        "ALTER TABLE ai_reports ADD COLUMN updated_at TEXT",
+    ):
+        try:
+            conn.execute(alter_sql)
+        except sqlite3.OperationalError:
+            pass  # 列已存在
+
     # 清理过期缓存
     from services.cache import clean_expired
     clean_expired()