Backtrace:
In ice-9/boot-9.scm:
  1752:10 11 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
          10 (apply-smob/0 #<thunk 7f7704f992a0>)
In ice-9/boot-9.scm:
    724:2  9 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
    619:8  8 (_ #(#(#<directory (guile-user) 7f7704f9ec80>)))
In cuirass/ui.scm:
   104:10  7 (run-cuirass-command _ . _)
In cuirass/scripts/evaluate.scm:
     99:7  6 (cuirass-evaluate _)
In cuirass/utils.scm:
    123:6  5 (make-worker-thread-channel _ #:parallelism _)
In srfi/srfi-1.scm:
    634:9  4 (for-each #<procedure 7f77009c9b10 at cuirass/utils.sc?> ?)
In cuirass/utils.scm:
   125:21  3 (_ . _)
In cuirass/scripts/evaluate.scm:
     99:7  2 (_)
In cuirass/database.scm:
   375:13  1 (db-open #:database _)
In squee.scm:
   257:10  0 (connect-to-postgres-paramstring _)

squee.scm:257:10: In procedure connect-to-postgres-paramstring:
Throw to key `psql-connect-error' with args `(connection-bad "connection to server on socket \"/var/run/postgresql/.s.PGSQL.5432\" failed: FATAL:  remaining connection slots are reserved for non-replication superuser connections\n")'.