Persist args in db and return args in job json (#82)

src/api/api_server.py

@@ -62,7 +62,7 @@ def jobs_json():
         return {'jobs': all_jobs, 'token': job_cache_token}
     except Exception as e:
         logger.exception(f"Exception fetching jobs_json: {e}")
-    return [], 500
+    return {}, 500
 
 
 @server.get('/api/jobs_long_poll')
@@ -76,11 +76,11 @@ def long_polling_jobs():
                 return all_jobs
             # Break after 30 seconds to avoid gateway timeout
             if time.time() - start_time > 30:
-                return [], 204
+                return {}, 204
             time.sleep(1)
     except Exception as e:
         logger.exception(f"Exception fetching long_polling_jobs: {e}")
-    return [], 500
+    return {}, 500
 
 
 @server.route('/api/job/<job_id>/thumbnail')