[GENERAL] Can't restart Postgres

I inadvertently deleted the ssl-cert-snakeoil.pem out from under a running Postgres instance (9.4) which caused it to
shutdown. The last line of main.log: 

FATAL:  could not load server certificate file "/etc/ssl/certs/ssl-cert-snakeoil.pem": No such file or directory

I've since restored the cert but cannot get Postgres to start back up.  It's the Debian 8 packaged version which
complicatesthe debugging and troubleshooting.  There doesn't seem to be a way to do anything with Postgres outsided the
ofDebian's systemd wrappers.  All I've got to work with is from /var/syslog: 

pangaea systemd[1]: Starting PostgreSQL Cluster 9.4-main...
pangaea postgresql@9.4-main[28684]: Error: could not exec  start -D /var/lib/postgresql/9.4/main -l
/var/log/postgresql/postgresql-9.4-main.log-s -o  -c config_file="/etc/postgresql/9.4/main/postgresql.conf" : 
pangaea systemd[1]: postgresql@9.4-main.service: control process exited, code=exited status=1

Any help/advice would be greatly appreciated.

-Shawn