Possible null reference return.

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

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

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

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

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

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

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

Argument of type 'List<Investment?>' cannot be used for parameter 'documents' of type 'IEnumerable<Investment>' in 'Task IMongoCollection<Investment>.InsertManyAsync(IEnumerable<Investment> documents, InsertManyOptions options = null, CancellationToken cancellationToken = default(CancellationToken))' due to differences in the nullability of reference types.