feat: record the observability fields end to end through telemetry

tests/integration/test_postgres_telemetry.py

@@ -39,6 +39,8 @@ _EXPECTED_COLUMNS = [
     "error",
     "cost",
     "created_at",
+    "cached_prompt_tokens",
+    "model_reported",
 ]
 
 # run 级前缀: 同库并存的其他运行(迁移批跑/另一开发机)互不可见
@@ -100,6 +102,8 @@ async def _record_minimal(
         "cache_hit": False,
         "error": None,
         "cost": None,
+        "cached_prompt_tokens": None,
+        "model_reported": None,
     }
     fields.update(overrides)
     await recorder.record_llm_call(**fields)