Add TypedDict types to scanner and bulk_ingest

Amp-Thread-ID: https://ampcode.com/threads/T-019c2af9-4d41-73e9-b38d-78d06bc28a3f
Co-authored-by: Amp <amp@ampcode.com>

app/assets/services/bulk_ingest.py

@@ -1,9 +1,21 @@
 import os
 import uuid
 from dataclasses import dataclass
+from typing import TypedDict
 
 from sqlalchemy.orm import Session
 
+
+class SeedAssetSpec(TypedDict):
+    """Spec for seeding an asset from filesystem."""
+
+    abs_path: str
+    size_bytes: int
+    mtime_ns: int
+    info_name: str
+    tags: list[str]
+    fname: str
+
 from app.assets.database.queries import (
     bulk_insert_asset_infos_ignore_conflicts,
     bulk_insert_assets,
@@ -29,7 +41,7 @@ class BulkInsertResult:
 
 def batch_insert_seed_assets(
     session: Session,
-    specs: list[dict],
+    specs: list[SeedAssetSpec],
     owner_id: str = "",
 ) -> BulkInsertResult:
     """Seed assets from filesystem specs in batch.