feat: Update trading_plans table to use ReplacingMergeTree for better update support

src/trading/trading_plan.py

@@ -78,7 +78,7 @@ def create_trading_plan_table():
     """Create the trading plans table if it doesn't exist"""
     with create_client() as client:
         try:
-            # Create new table with a simple structure if it doesn't exist
+            # Create new table with a structure that supports updates
             query = """
             CREATE TABLE IF NOT EXISTS trading_plans
             (
@@ -120,7 +120,7 @@ def create_trading_plan_table():
                 fundamental_criteria String,
                 options_strategy_details String
             ) 
-            ENGINE = MergeTree()
+            ENGINE = ReplacingMergeTree(updated_at)
             ORDER BY id
             """
             client.command(query)