Add PostgreSQL configuration

postgresql.conf

@@ -0,0 +1,19 @@
+checkpoint_completion_target = 0.9
+default_statistics_target = 100
+effective_cache_size = 12GB
+effective_io_concurrency = 200
+huge_pages = off
+listen_addresses = '*'
+maintenance_work_mem = 1GB
+max_connections = 50
+max_parallel_maintenance_workers = 4
+max_parallel_workers = 12
+max_parallel_workers_per_gather = 4
+max_wal_size = 4GB
+max_worker_processes = 12
+min_wal_size = 1GB
+random_page_cost = 1.1
+shared_buffers = 4GB
+superuser_reserved_connections = 3
+wal_buffers = 16MB
+work_mem = 19784kB