rewrite postgresql config tasks

roles/postgresql/vars/main.yml

@@ -1,31 +1,45 @@
 ---
+# PostgreSQL
+
 pgsql_server_version: 14
-pgsql_unix_socket: "/var/run/postgresql"  # comma-separated list of directories
-pgsql_listen_addresses: "{{ pgsql_server_ip }}"  # what IP address(es) to listen on;
-pgsql_password_encryption: "scram-sha-256"  # scram-sha-256 or md5
-pgsql_max_connections: "200"  # default 100
-pgsql_shared_buffers: "1GB"  # min 128kB, default 128MB
-pgsql_effective_cache_size: "3GB"  # default 4GB
-pgsql_maintenance_work_mem: "256MB"  # min 1MB, default 64MB
-pgsql_checkpoint_completion_target: "0.9"  # checkpoint target duration, 0.0 - 1.0, default 0.9
-pgsql_wal_buffers: "16MB"  # min 32kB, default -1 sets based on shared_buffers
-pgsql_default_statistics_target: "100"  # range 1-10000, default 100
-pgsql_random_page_cost: "1.1"  # how long it take to seek to a random disk page, default 4.0
-pgsql_effective_io_concurrency: "200"  # 1-1000; 0 disables prefetching, default 1
-pgsql_work_mem: "5242kB"  # min 64kB, default 4MB
-pgsql_min_wal_size: "1GB"  # default 80MB
-pgsql_max_wal_size: "4GB"  # default 1GB
-pgsql_max_worker_processes: "2"  # default 8
-pgsql_max_parallel_workers_per_gather: "1"  # taken from max_parallel_workers, default 2
-pgsql_max_parallel_workers: "2"  # maximum number of max_worker_processes that can be used in parallel, default 8
-pgsql_max_parallel_maintenance_workers: "1"  # taken from max_parallel_workers, default 2
+pgsql_config:
+  # - name: unix_socket_directories
+  #   value: default  # comma-separated list of directories. default: "/var/run/postgresql"
+  - name: listen_addresses
+    value: "{{ hostvars[inventory_hostname]['private_ipv4'] }}"  # what IP address(es) to listen on;
+  - name: password_encryption
+    value: default  # default scram-sha-256
+  - name: max_connections
+    value: "200"  # default 100
+  - name: shared_buffers
+    value: "1GB"  # min 128kB, default 128MB
+  - name: effective_cache_size
+    value: "3GB"  # default 4GB
+  - name: maintenance_work_mem
+    value: "256MB"  # min 1MB, default 64MB
+  - name: checkpoint_completion_target
+    value: "0.9"  # checkpoint target duration, 0.0 - 1.0, default 0.9
+  - name: wal_buffers
+    value: "16MB"  # min 32kB, default -1 sets based on shared_buffers
+  - name: random_page_cost
+    value: "1.1"  # how long it take to seek to a random disk page, default 4.0
+  - name: effective_io_concurrency
+    value: "200"  # 1-1000; 0 disables prefetching, default 1
+  - name: work_mem
+    value: "2621kB"  # min 64kB, default 4MB
+  - name: min_wal_size
+    value: "1GB"  # default 80MB
+  - name: max_wal_size
+    value: "4GB"  # default 1GB
+
+pgsql_client_auth:
+  - comment: nextcloud
+    databases: nextcloud_db
+    users: nextcloud_db_user
+    address: "{{ nextcloud_server_ip }}/32"
+    method: scram-sha-256
+
+# PostgreSQL exporter
 
 pgsql_exporter_install_dir: "/usr/local/bin"
 pgsql_exporter_user: "postgres"
-
-pgsql_client_auth:
-  - name: nextcloud
-    db: nextcloud_db
-    user: nextcloud_db_user
-    address: "{{ nextcloud_server_ip }}/32"
-    method: scram-sha-256