Is there a psql equivalent of bash's reverse-search-history?
A conversation about this on GitHub led to an interim "quick fix" solution:


  open ~/.editrc and add:
  
  bind "^R" em-inc-search-prev


Apparently the bigger issue is that PostgresApp uses libedit instead of libreadline. And supposedly libedit lacks some command-line features of libreadline, so until PostgresApp is compiled against libreadline, just use the above quick fix.