fix json for checkpoint retrieval (#4)

- fix json for checkpoint retrieval (df88796bae16b2311a944c1ac9f5974c7b3db1d3)

users.json

@@ -19,7 +19,7 @@
             "openai": "OPENAI_YCHK",
             "perplexity": "PERPLEXITY_YCHK"
         },
-        "save_name": "5085547333501978022"
+        "save_name": "5085547333501978022.xlsx"
     },
     "almaa": {
         "name": "almaa",
@@ -42,7 +42,7 @@
             "openai": "OPENAI_ALMAA",
             "perplexity": "PERPLEXITY_ALMAA"
         },
-      "save_name": "5132330748445073023"
+      "save_name": "5132330748445073023.xlsx"
     },
     "maks": {
         "name": "maks",
@@ -63,7 +63,7 @@
             "groq": "GROQ_MAKS",
             "claude": "CLAUDE_MAKS"
         },
-      "save_name": "924255982043845161"
+      "save_name": "924255982043845161.xlsx"
     },
     "yl": {
         "name": "yl",
@@ -75,7 +75,7 @@
                 "new value1"
             ]
         },
-        "save_name": "7142379948676519351"
+        "save_name": "7142379948676519351.xlsx"
     },
     "Guest": {
         "name": "Guest",
@@ -93,6 +93,6 @@
             "groq": "GROQ_API_KEY",
             "claude": "CLAUDE_API_KEY"
         },
-       "save_name": "7783002652599471029"
+       "save_name": "7783002652599471029.xlsx"
     }
 }