fix: gracefully catch ArXiv HTTP 429 errors and fix export analysis endpoint parameter binding

app/api/routes/analysis.py

@@ -1,7 +1,7 @@
 """
 Routes analyses K2 Think
 """
-from fastapi import APIRouter, Depends, HTTPException, status, BackgroundTasks
+from fastapi import APIRouter, Depends, HTTPException, status, BackgroundTasks, Body
 from fastapi.responses import Response, FileResponse
 from sqlalchemy.orm import Session
 from app.dependencies import get_db, get_current_user
@@ -586,7 +586,7 @@ async def get_specific_analysis(
 async def export_analysis(
     analysis_id: str,
     format: str,
-    request: dict, # Pass full context to avoid refetching for demo
+    request: dict = Body(...), # Pass full context to avoid refetching for demo
     current_user = Depends(get_current_user)
 ):
     """

app/services/arxiv_service.py

@@ -29,19 +29,22 @@ class ArXivService:
         )
         
         results = []
-        for result in search.results():
-            try:
-                results.append({
-                    "id": result.get_short_id(),
-                    "title": result.title,
-                    "authors": [author.name for author in result.authors],
-                    "summary": result.summary,
-                    "url": result.pdf_url,
-                    "categories": result.categories,
-                    "publication_date": result.published.strftime("%Y-%m-%d") if result.published else None
-                })
-            except Exception as e:
-                logger.error(f"Error fetching metadata for {result.title}: {e}")
+        try:
+            for result in search.results():
+                try:
+                    results.append({
+                        "id": result.get_short_id(),
+                        "title": result.title,
+                        "authors": [author.name for author in result.authors],
+                        "summary": result.summary,
+                        "url": result.pdf_url,
+                        "categories": result.categories,
+                        "publication_date": result.published.strftime("%Y-%m-%d") if result.published else None
+                    })
+                except Exception as e:
+                    logger.error(f"Error fetching metadata for {result.title}: {e}")
+        except Exception as api_err:
+            logger.error(f"ArXiv API request failed (e.g., 429 Too Many Requests): {api_err}")
                 
         return results