feat: add favorite task templates and optimize evidence exports

artemis/data_engine/storage.py

@@ -199,6 +199,18 @@ class StorageManager:
                 )
             """)
 
+            # Applied to existing databases as well. Report and timeline readers
+            # look up traces per step/session; never scan the entire history.
+            conn.execute(
+                "CREATE INDEX IF NOT EXISTS traces_step_type_time ON traces(step_id,type,timestamp)"
+            )
+            conn.execute(
+                "CREATE INDEX IF NOT EXISTS traces_session_type_time ON traces(session_id,type,timestamp)"
+            )
+            conn.execute(
+                "CREATE INDEX IF NOT EXISTS steps_session_number ON steps(session_id,step_number)"
+            )
+
             conn.execute("""
                 CREATE TABLE IF NOT EXISTS failed_outputs (
                     id INTEGER PRIMARY KEY AUTOINCREMENT,