bug: Decimal type forces EF migrator to create migrations again and again (#446)

Author: KirillKurdyukov

src/EFCore.Ydb/CHANGELOG.md

@@ -1,3 +1,5 @@
+- Fixed bug: Decimal type forces EF migrator to create migrations again and again ([#434](https://github.com/ydb-platform/ydb-dotnet-sdk/issues/434)).
+
 ## v0.0.1
 
 - Supported migration tools: initial implementation of EF Core migration tool support.

src/EFCore.Ydb/src/Storage/Internal/Mapping/YdbDecimalTypeMapping.cs

@@ -27,5 +27,5 @@ protected override RelationalTypeMapping Clone(RelationalTypeMappingParameters p
 
     protected override string ProcessStoreType(
         RelationalTypeMappingParameters parameters, string storeType, string storeTypeNameBase
-    ) => $"{storeType}({parameters.Precision ?? DefaultPrecision}, {parameters.Scale ?? DefaultScale})";
+    ) => $"Decimal({parameters.Precision ?? DefaultPrecision}, {parameters.Scale ?? DefaultScale})";
 }