fix(prediction): correct dataset mapping

stratoflights_api/services/tawhiri.py

@@ -5,6 +5,12 @@ from typing import Any
 from zoneinfo import ZoneInfo
 from collections import OrderedDict
 
+# Request value meaning "let the predictor use whatever run it has loaded".
+# Lives here because this module is the one that decides what reaches the
+# predictor; the serializer imports it as its default.
+LATEST_DATASET_KEYWORD = "latest"
+
+
 class TawhiriClient:
     BASE_URL = "http://127.0.0.1:8080/api/v1/prediction"
     TIMEOUT = 15
@@ -36,7 +42,20 @@ class TawhiriClient:
         query["burst_altitude"] = params.get("burst_altitude")
         query["descent_rate"] = params.get("descent_rate")
         query["interpolate"] = str(params.get("interpolate", False)).lower()
-        #query["dataset"] = cls._convert_value(params.get("dataset"))
+        # Forwarded only when the operator actually named a run.
+        #
+        # The predictor now honours this parameter and refuses a run it does not
+        # hold, so anything that is not a real epoch must not be sent. Two values
+        # reach here that are not: "" from the UI, and LATEST_DATASET_KEYWORD, the
+        # serializer's default, which means "server chooses" — exactly what
+        # omitting the parameter does. The `filtered` comprehension below drops
+        # None but neither of these.
+        #
+        # A malformed epoch is deliberately still forwarded, so the predictor
+        # rejects it instead of the value being quietly ignored.
+        dataset = params.get("dataset")
+        if dataset and dataset != LATEST_DATASET_KEYWORD:
+            query["dataset"] = cls._convert_value(dataset)
         query["format"] = params.get("format", "json")
         query["pred_type"] = "single"  # <-- в конце