cellar rat
n.— «He will be at the winery for six months working as what is known as a cellar rat—someone who does odd jobs around the winery during the vintage.» —“Job winner as happy as a rat in a cellar” by Bernard Carpinter Stuff.co.nz Mar. 1, 2006. (source: Double-Tongued Dictionary)
Further reading
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Cellar Rat is a term which has been around for years within the wine / winery business. It’s a title not intended to be derogatory.