bundles/postgresql: more cache, please

bundles/postgresql/files/postgresql.conf

@@ -9,6 +9,7 @@ max_connections = ${max_connections}
 autovacuum_max_workers = ${autovacuum_max_workers}
 maintenance_work_mem = ${maintenance_work_mem}MB
 work_mem = ${work_mem}MB
+effective_cache_size = ${cache_size}MB
 shared_buffers = ${shared_buffers}MB
 temp_buffers = ${temp_buffers}MB
 log_destination = syslog

bundles/postgresql/metadata.py

@@ -24,6 +24,7 @@ defaults = {
         'shared_buffers': 128,
         'temp_buffers': 8,
         'slow_query_log_sec': 0,
+        'cache_size': 256,
     },
 }