Add period selector and crypto-style trend plan preview table.

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

strategy/strategy_db.py

@@ -61,7 +61,8 @@ CREATE TABLE IF NOT EXISTS trend_pullback_plans (
     avg_entry_price REAL,
     lots_open INTEGER DEFAULT 0,
     opened_at TEXT,
-    message TEXT
+    message TEXT,
+    period TEXT DEFAULT '15m'
 )
 """
 
@@ -138,6 +139,10 @@ def init_strategy_tables(conn) -> None:
         CTP_SIM_POSITIONS_SQL,
     ):
         conn.execute(sql)
+    try:
+        conn.execute("ALTER TABLE trend_pullback_plans ADD COLUMN period TEXT DEFAULT '15m'")
+    except Exception:
+        pass
     if not conn.execute("SELECT id FROM ctp_sim_account WHERE id=1").fetchone():
         conn.execute("INSERT INTO ctp_sim_account (id, balance, available) VALUES (1, 100000, 100000)")
     conn.commit()