fixed ticks greater than zero error

backend/routers/users/dependencies.py

@@ -66,6 +66,10 @@ async def start_end_tick_dep(game: Game = Depends(game_dep),
         raise HTTPException(
             status_code=400, detail="Game just started (it is tick=0), no data to return")
 
+    if start_tick < 0 or end_tick < 0:
+        raise HTTPException(
+            status_code=400, detail=f"Start ({start_tick}) and end ({end_tick}) tick must both be greater than 0")
+
     if end_tick < start_tick:
         raise HTTPException(
             status_code=400, detail="End tick must be greater than start tick")

testing/cheat_sheet.ipynb

@@ -233,25 +233,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": 34,
    "id": "838d39e0-3875-4cd3-b620-c4df377e5308",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "{'detail': 'Expiration tick (-541) must be in the future, current_tick (459)'}"
+       "1290"
       ]
      },
-     "execution_count": 30,
+     "execution_count": 34,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
     "algotrade_api.create_order(resource=algotrade_api.Resource.oil,\n",
     "                          price=10, side=algotrade_api.OrderSide.BUY,\n",
-    "                          size=1, expiration_length=).json()"
+    "                          size=1, expiration_length=1).json()"
    ]
   },
   {