Add a pg config to encelade

users/encelade/postgresql.conf

+# Base settings
+listen_addresses = '*'
+max_connections = 100
+shared_buffers = 128MB
+dynamic_shared_memory_type = posix
+
+# Backups
+wal_level = archive
+max_wal_senders = 5
+archive_mode = on
+archive_command = 'test ! -f /wal/%f && cp %p /wal/%f'
+
+# Defaults
+log_timezone = 'UTC'
+datestyle = 'iso, mdy'
+timezone = 'UTC'
+lc_messages = 'en_US.utf8'
+lc_monetary = 'en_US.utf8'
+lc_numeric = 'en_US.utf8'
+lc_time = 'en_US.utf8'
+default_text_search_config = 'pg_catalog.english'
+
+# Extended options
+shared_preload_libraries = 'pg_stat_statements'
+pg_stat_statements.track = all