fix(training): use selected chart and include TA-Lib span sources

services/ml/app/data_access.py

@@ -59,6 +59,25 @@ class DataAccess:
             if result:
                 return dict(result._mapping)
             return None
+
+    def get_chart_by_id(self, chart_id: int) -> Optional[Dict[str, Any]]:
+        """
+        Get chart by ID.
+
+        Args:
+            chart_id: Chart ID
+
+        Returns:
+            Chart dictionary or None if not found
+        """
+        with get_db() as db:
+            chart_id = int(chart_id)
+            stmt = select(self.charts).where(self.charts.c.id == chart_id)
+            result = db.execute(stmt).fetchone()
+
+            if result:
+                return dict(result._mapping)
+            return None
     
     def get_candles(
         self,