Continue GC code review: Pydantic

tests/integration/test_pipeline_flow.py

@@ -9,6 +9,8 @@ from transcription.config import Settings
 from transcription.db.models import Document
 from transcription.db.models import JobSourceStatus
 from transcription.db.models import JobStatus
+from transcription.providers.base import ProviderUsage
+from transcription.providers.base import TranscriptionMetadata
 from transcription.providers.base import TranscriptionResult
 from transcription.services import ServiceBundle
 from transcription.services.store import create_document_job
@@ -84,7 +86,10 @@ class TestPipelineSuccessFlow:
                 provider="openrouter",
                 model="test-model",
                 prompt_name="transcribe_document.md",
-                ai_metadata={"finish_reason": "stop", "usage": {"total_tokens": 42}},
+                metadata=TranscriptionMetadata(
+                    finish_reason="stop",
+                    usage=ProviderUsage(total_tokens=42),
+                ),
                 raw_api_response={"id": "resp_123", "choices": [{"message": {"content": "Pipeline transcript"}}]},
             )