ERROR 21000 ON CONFLICT DO UPDATE command cannot affect row a second time

ERROR #21000 ON CONFLICT DO UPDATE command cannot affect row a second time
Ref: https://pganalyze.com/docs/log-insights/app-errors/U126

See also

• INSERT
• PostgreSQL: psql, .psqlrc, .pgpass, $HOME/.pg service.conf, -U, -W, -d, meta-commands: \du, \dg, \ddp, \dp, \list, \dn, \dt, \c, \l, \di, \q, show users, show, su - postgres, psql -c, \?, \connect, \conninfo, --version, --help, PL/pgSQL