first commit

NitroxClient/GameLogic/Spawning/Metadata/Extractor/WaterParkCreatureMetadataExtractor.cs

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+using NitroxClient.GameLogic.Spawning.Metadata.Extractor.Abstract;
+using NitroxModel.DataStructures.GameLogic.Entities.Metadata;
+
+namespace NitroxClient.GameLogic.Spawning.Metadata.Extractor;
+
+public class WaterParkCreatureMetadataExtractor : EntityMetadataExtractor<WaterParkCreature, WaterParkCreatureMetadata>
+{
+    public override WaterParkCreatureMetadata Extract(WaterParkCreature entity)
+    {
+        // We don't need to save metadata for fishes with default values
+        if (entity.age == -1)
+        {
+            return null;
+        }
+        return new(entity.age, entity.matureTime, entity.timeNextBreed, entity.bornInside);
+    }
+}