Instruction file imported from Petit-Pas/Blazor_DnD_FightTool (.github/instructions/mapping.instructions.md). Copyright stays with the author.

Mapping Configuration Conventions (Mapster)

• Library: Mapster via custom IMapper / Mapper wrapper in the Mapping infrastructure project.
• Location: Each feature area has a Mapping/MappingConfigurations.cs file next to the entities.
• Visibility: internal static class MappingConfigurations with internal static IServiceCollection Register{Feature}MappingConfigurations(...).
• Config pattern: Use TypeAdapterConfig<TSource, TTarget>.NewConfig() for custom mapping rules.
• Duplication: Use .IgnoreWhenDuplicating(x => x.Id) to skip identity properties during Clone() (but not Copy()).
• Clone vs Copy:
  • Clone<T>() — creates a new instance with new Ids (for duplicating entities).
  • Copy<T>() — creates an exact copy including Ids (for undo snapshots).
• Registration: Called from a parent RegisterDnDEntitiesMappingConfigurations() extension method that chains all feature-specific registrations.