ndb: parse profiles, index notes using clustered keys (William Casarin)

notes: change created_at to uint64 (William Casarin)

note: add a reserved area for future expansion (William Casarin)

nbd: add clustered key helpers (William Casarin)

ndb: add padding to tags (William Casarin)

schema: add evid (William Casarin)

schemas: add event metadata schema (William Casarin)

make: more comprehensive ctag searching (William Casarin)

make: simplify flatcc builder commands (William Casarin)

memchr: fix build on non-arm systems (William Casarin)

pushed to nostrdb:refs/heads/master