Supporting Rochdale should come with a health warning. For all that football has a wonderful propensity for drama, few clubs have ever packed in the heart-stopping tribulations of their past fortnight. But, after it all, they are a Football League club again. And that is all that matters. Hopes of returning to the ranks of the country’s top 92 clubs looked to have disintegrated as mere seconds remained for Boreham Wood to cling on for victory in this National League playoff final. Then came Mani Dieseruvwe’s extraordinary 96th-minute equaliser to send the match into extra time that preceded penalties. Step forward Oliver Whatmuff – a goalkeeper on loan from Manchester City who started this season aged just 17 and ended it as Rochdale’s hero, saving twice to secure a 3-1 shootout triumph a day after he was named in the National League team of the season. Given what they went through a fortnight earlier, it was almost too much for Rochdale fans to take.…