Fix typing and minor issues

great_ai/tracing/add_ground_truth.py

@@ -51,7 +51,7 @@ def add_ground_truth(
 
     created = datetime.utcnow().isoformat()
     traces = [
-        Trace(
+        Trace[T](
             created=created,
             original_execution_time_ms=0,
             logged_values=X if isinstance(X, dict) else {"input": X},

great_ai/tracing/delete_ground_truth.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import List, Optional, Union
+from typing import List, Optional, Union, cast
 
 from ..context import get_context
 
@@ -19,4 +19,4 @@ def delete_ground_truth(
         conjunctive_tags=tags, until=until, since=since, has_feedback=True
     )
 
-    db.delete_batch([i.trace_id for i in items])
+    db.delete_batch([cast(str, i.trace_id) for i in items])