Short ids for every movie, series, show and person, shown below the poster

Every movie, series, show and person has its own 5-character short id (like a9s9a), shown below its poster/photo. Test: open a movie, a series and a person — each shows its short id under the image; titles from the old tracker keep their old id (e.g. 100jh). Details:

• Creator: "i wanted to give all our movies, shows, series and persons own short ids like a9s9a - are they still in the data? those ids show below the poster."
• Found: the old export has them only for 702 of 9,453 shows (field 'id', sequential base62 '100jh'…; counter at '1012z'); persons have none; the migration did not carry them over.
• Architect: keep the 702 old ids; everyone else gets a new random 5-character id (a–z, 0–9, unique across all kinds, like ident's short ids); new records get one when created. Optional route /<shortid> → redirects to the page (architect's idea, cheap).