Possible null reference argument for parameter 'connectionString' in 'DbContextOptionsBuilder CosmosDbContextOptionsExtensions.UseCosmos(DbContextOptionsBuilder optionsBuilder, string connectionString, string databaseName, Action<CosmosDbContextOptionsBuilder>? cosmosOptionsAction = null)'.

Possible null reference return.

Nullable value type may be null.

Non-nullable property 'LastModified' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'source' in 'IEnumerable<OrcanodeEvent> Enumerable.Where<OrcanodeEvent>(IEnumerable<OrcanodeEvent> source, Func<OrcanodeEvent, bool> predicate)'.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.