Dereference of a possibly null reference.

'RelationalEntityTypeBuilderExtensions.HasComment<TEntity>(EntityTypeBuilder<TEntity>, string?)' is obsolete: 'Configure this using ToTable(t => t.HasComment()) instead.'

Type 'HolidayItemRecord' can be sealed because it has no subtypes in its containing assembly and is not externally visible (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1852)

'EventDateTime.DateTime' is obsolete: 'This property is obsolete and may behave unexpectedly; please use DateTimeDateTimeOffset instead.'

'EventDateTime.DateTime' is obsolete: 'This property is obsolete and may behave unexpectedly; please use DateTimeDateTimeOffset instead.'

Dereference of a possibly null reference.

Type 'IrregularDisplayItem' can be sealed because it has no subtypes in its containing assembly and is not externally visible (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1852)

Type 'ProgressFormScope' can be sealed because it has no subtypes in its containing assembly and is not externally visible (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1852)

Type 'ProgressReporter' can be sealed because it has no subtypes in its containing assembly and is not externally visible (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1852)