fix: write_holding_strategy DELETE+INSERT (no UNIQUE constraint on code)

mofin_db.py

@@ -169,7 +169,7 @@ def init_all_tables(conn: sqlite3.Connection):
             updated_at      TEXT,
             superseded_at   TEXT
         );
-        CREATE INDEX IF NOT EXISTS idx_strategy_code ON holding_strategies(code);
+        CREATE UNIQUE INDEX IF NOT EXISTS idx_strategy_code ON holding_strategies(code);
         CREATE INDEX IF NOT EXISTS idx_strategy_status ON holding_strategies(status);
 
         -- 自选股
@@ -954,6 +954,8 @@ def write_holding_strategy(conn, code: str, name: str, data: dict) -> tuple[bool
     """写入持仓策略（替代 decisions.json 单条写入）。data 必须包含 currency。"""
     try:
         currency = data.get('currency', 'CNY')
+        # DELETE + INSERT（避免依赖 code 的 UNIQUE 约束）
+        conn.execute("DELETE FROM holding_strategies WHERE code=?", (code,))
         conn.execute("""
             INSERT INTO holding_strategies 
             (code, name, version, price, cost, shares, stop_loss, take_profit,
@@ -962,18 +964,6 @@ def write_holding_strategy(conn, code: str, name: str, data: dict) -> tuple[bool
              sector_context, status, trigger_json, changelog_json,
              source, reason, updated_at)
             VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,datetime('now','localtime'))
-            ON CONFLICT(code) DO UPDATE SET
-                name=excluded.name, price=excluded.price, cost=excluded.cost,
-                shares=excluded.shares, stop_loss=excluded.stop_loss,
-                take_profit=excluded.take_profit, entry_low=excluded.entry_low,
-                entry_high=excluded.entry_high, currency=excluded.currency,
-                action=excluded.action, timing_signal=excluded.timing_signal,
-                rr_ratio=excluded.rr_ratio, tech_snapshot=excluded.tech_snapshot,
-                stock_category=excluded.stock_category,
-                sector_context=excluded.sector_context, status=excluded.status,
-                trigger_json=excluded.trigger_json, changelog_json=excluded.changelog_json,
-                source=excluded.source, reason=excluded.reason,
-                updated_at=datetime('now','localtime')
         """, (
             code, name,
             data.get('version', 1), data.get('price'), data.get('cost'),