Keep partial rewrite results from LLM batches

ai_daily_report/rewrite.py

@@ -73,9 +73,6 @@ def _apply_rewrite_batch(batch: list[NewsItem], llm_call: RewriteLlmCall) -> int
             by_id[item_id].title = title
             by_id[item_id].summary = summary
             seen_ids.add(item_id)
-    for item in batch:
-        if item.id not in seen_ids:
-            raise ValueError(f"missing_rewrite_for_item: {item.id}")
     return len(seen_ids)
 
 
@@ -89,11 +86,19 @@ def rewrite_items(
 ) -> tuple[list[NewsItem], dict[str, Any]]:
     rewritten_count = 0
     fallback_count = 0
+    missing_rewrite_count = 0
     errors: list[str] = []
 
     for batch in _chunks(items, max(1, batch_size)):
         try:
-            rewritten_count += _apply_rewrite_batch(batch, llm_call)
+            batch_rewritten_count = _apply_rewrite_batch(batch, llm_call)
+            rewritten_count += batch_rewritten_count
+            for item in batch:
+                if item.title is None or item.summary is None:
+                    errors.append(f"missing_rewrite_for_item: {item.id}")
+                    _fallback(item)
+                    fallback_count += 1
+                    missing_rewrite_count += 1
         except Exception as exc:
             errors.append(f"batch:{type(exc).__name__}: {exc}")
             if _is_transient_llm_error(exc):
@@ -123,6 +128,7 @@ def rewrite_items(
         "input_count": len(items),
         "rewritten_count": rewritten_count,
         "fallback_count": fallback_count,
+        "missing_rewrite_count": missing_rewrite_count,
         "fallback_ratio": round(fallback_ratio, 4),
         "batch_count": len(_chunks(items, max(1, batch_size))),
         "errors": errors,