Module 6: Lobby & Matchmaking System (backend) - #9

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'source' in 'IEnumerable<Guid> Enumerable.Select<MatchmakingAssignment, Guid>(IEnumerable<MatchmakingAssignment> source, Func<MatchmakingAssignment, Guid> selector)'.

'NpgsqlEntityTypeBuilderExtensions.UseXminAsConcurrencyToken<TEntity>(EntityTypeBuilder<TEntity>)' is obsolete: 'Use EF Core's standard IsRowVersion() or

Filter expression is a constant 'true', consider removing the filter

Possible null reference argument for parameter 'source' in 'IEnumerable<Guid> Enumerable.Select<MatchmakingAssignment, Guid>(IEnumerable<MatchmakingAssignment> source, Func<MatchmakingAssignment, Guid> selector)'.

'NpgsqlEntityTypeBuilderExtensions.UseXminAsConcurrencyToken<TEntity>(EntityTypeBuilder<TEntity>)' is obsolete: 'Use EF Core's standard IsRowVersion() or