fix: resolve alias:* signals to only the subset one

Author: sgratzl

src/server/endpoints/covidcast_utils/model.py

@@ -165,7 +165,11 @@ def create_source_signal_alias_mapper(source_signals: List[SourceSignalPair]) ->
             continue
         # uses an alias
         alias_to_data_sources.setdefault(source.db_source, []).append(source)
-        transformed_pairs.append(SourceSignalPair(source.db_source, pair.signal))
+        if pair.signal == True:
+            # list all signals of this source (*) so resolve to a plain list of all in this alias
+            transformed_pairs.append(SourceSignalPair(source.db_source, [s.signal for s in source.signals]))
+        else:
+            transformed_pairs.append(SourceSignalPair(source.db_source, pair.signal))
 
     if not alias_to_data_sources:
         # no alias needed