Possible null reference argument for parameter 'parentId' in 'Activity Activity.SetParentId(string parentId)'.

Non-nullable field '_allowedTypes' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable property 'Bron' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

Possible null reference argument for parameter 'postgreSqlOptions' in 'void ConfigHelpers.ThrowIfInvalidPostgreSqlOptions(PostgreSqlOptionsSection postgreSqlOptions)'.

Possible null reference argument for parameter 'elasticSearchOptions' in 'void ConfigHelpers.ThrowIfInvalidElasticOptions(ElasticSearchOptionsSection elasticSearchOptions)'.

Possible null reference argument for parameter 'postgreSqlOptions' in 'string GetPostgresConnectionString(PostgreSqlOptionsSection postgreSqlOptions)'.

Possible null reference return.

Possible null reference argument for parameter 'parentId' in 'Activity Activity.SetParentId(string parentId)'.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

Non-nullable property 'Bron' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

'IDocumentStore.OpenSession(DocumentTracking, IsolationLevel)' is obsolete: 'Opening a session without explicitly providing desired type may be dropped in next Marten version.

Non-nullable field '_allowedTypes' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference argument for parameter 'postgreSqlOptions' in 'void ConfigurationExtensions.ThrowIfInvalid(PostgreSqlOptionsSection postgreSqlOptions)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'uriString' in 'Uri.Uri(string uriString)'.