smp-server: reduce Prometheus and expiration DB load (#1872)

* smp server: add prometheus scan indexes

* smp server: estimate queue count in metrics

* docs: add smp server db load report

* smp server: reduce msg_queues write load

* docs: document batch-2 fixes and operator actions

src/Simplex/Messaging/Server/QueueStore/Postgres/server_schema.sql

@@ -1,5 +1,6 @@
 
 
+
 SET statement_timeout = 0;
 SET lock_timeout = 0;
 SET idle_in_transaction_session_timeout = 0;
@@ -56,7 +57,7 @@ $$;
 
 
 
-CREATE PROCEDURE smp_server.expire_old_messages(IN p_old_queue bigint, IN p_old_ts bigint, IN batch_size integer, OUT r_expired_msgs_count bigint, OUT r_stored_msgs_count bigint, OUT r_stored_queues bigint)
+CREATE PROCEDURE smp_server.expire_old_messages(IN p_old_ts bigint, IN batch_size integer, OUT r_expired_msgs_count bigint, OUT r_stored_msgs_count bigint, OUT r_stored_queues bigint)
     LANGUAGE plpgsql
     AS $$
 DECLARE
@@ -73,7 +74,6 @@ BEGIN
       SELECT recipient_id
       FROM msg_queues
       WHERE deleted_at IS NULL
-        AND updated_at > p_old_queue
         AND msg_queue_expire = TRUE
         AND recipient_id > last_rid
       ORDER BY recipient_id ASC
@@ -397,7 +397,8 @@ CREATE TABLE smp_server.messages (
     msg_quota boolean NOT NULL,
     msg_ntf_flag boolean NOT NULL,
     msg_body bytea NOT NULL
-);
+)
+WITH (autovacuum_vacuum_scale_factor='0.02', autovacuum_analyze_scale_factor='0.01', toast.autovacuum_vacuum_scale_factor='0.02');
 
 
 
@@ -441,7 +442,8 @@ CREATE TABLE smp_server.msg_queues (
     msg_can_write boolean DEFAULT true NOT NULL,
     msg_queue_expire boolean DEFAULT false NOT NULL,
     msg_queue_size bigint DEFAULT 0 NOT NULL
-);
+)
+WITH (fillfactor='80', autovacuum_vacuum_scale_factor='0.02', autovacuum_analyze_scale_factor='0.01', autovacuum_vacuum_cost_limit='1000');
 
 
 
@@ -453,7 +455,8 @@ CREATE TABLE smp_server.services (
     created_at bigint NOT NULL,
     queue_count bigint DEFAULT 0 NOT NULL,
     queue_ids_hash bytea DEFAULT '\x00000000000000000000000000000000'::bytea NOT NULL
-);
+)
+WITH (fillfactor='70', autovacuum_vacuum_threshold='1000', autovacuum_vacuum_scale_factor='0');
 
 
 
@@ -494,10 +497,18 @@ CREATE INDEX idx_messages_recipient_id_msg_ts ON smp_server.messages USING btree
 
 
 
+CREATE INDEX idx_msg_queues_expire ON smp_server.msg_queues USING btree (recipient_id) WHERE ((deleted_at IS NULL) AND msg_queue_expire);
+
+
+
 CREATE UNIQUE INDEX idx_msg_queues_link_id ON smp_server.msg_queues USING btree (link_id);
 
 
 
+CREATE INDEX idx_msg_queues_notifier_active ON smp_server.msg_queues USING btree (notifier_id) WHERE ((deleted_at IS NULL) AND (notifier_id IS NOT NULL));
+
+
+
 CREATE UNIQUE INDEX idx_msg_queues_notifier_id ON smp_server.msg_queues USING btree (notifier_id);
 
 
@@ -514,10 +525,6 @@ CREATE UNIQUE INDEX idx_msg_queues_sender_id ON smp_server.msg_queues USING btre
 
 
 
-CREATE INDEX idx_msg_queues_updated_at_recipient_id ON smp_server.msg_queues USING btree (deleted_at, updated_at, msg_queue_expire, recipient_id);
-
-
-
 CREATE INDEX idx_services_service_role ON smp_server.services USING btree (service_role);
 
 
@@ -549,3 +556,4 @@ ALTER TABLE ONLY smp_server.msg_queues
 
 
 
+