public void Insert <TEntity>(FileSystemConnectionContext connectionContext, TEntity model)
where TEntity : DataEvent
{
var fileTypeMarker = model is Snapshot
? "snapshot"
: "event";
var fullName = Path.Combine(connectionContext.DataRoot, $"{fileTypeMarker}--{model.ContractName}--{model.Id}.json");
var contents = JsonConvert.SerializeObject(model, Formatting.Indented);
_fileSystem.CreateDirectoryIfItDoesntExist(connectionContext.DataRoot);
_fileSystem.WriteAllText(fullName, contents);
}