fix(coderd/database): optimize provisioner daemon with status query using index (#19703)

Fixes coder/internal#724

This change adds an index to optimize the
`GetProvisionerDaemonsWithStatusByOrganization` query.

Execution time dropped from `18s 838ms` to `107ms`.

coderd/database/dump.sql

@@ -2949,6 +2949,10 @@ CREATE INDEX provisioner_job_logs_id_job_id_idx ON provisioner_job_logs USING bt
 
 CREATE INDEX provisioner_jobs_started_at_idx ON provisioner_jobs USING btree (started_at) WHERE (started_at IS NULL);
 
+CREATE INDEX provisioner_jobs_worker_id_organization_id_completed_at_idx ON provisioner_jobs USING btree (worker_id, organization_id, completed_at DESC);
+
+COMMENT ON INDEX provisioner_jobs_worker_id_organization_id_completed_at_idx IS 'Support index for finding the latest completed jobs for a worker (and organization), nulls first so that active jobs have priority; targets: GetProvisionerDaemonsWithStatusByOrganization';
+
 CREATE UNIQUE INDEX provisioner_keys_organization_id_name_idx ON provisioner_keys USING btree (organization_id, lower((name)::text));
 
 CREATE INDEX template_usage_stats_start_time_idx ON template_usage_stats USING btree (start_time DESC);

coderd/database/migrations/000363_optimize_getprovisionerdaemonswithstatusbyorganization_query.down.sql

@@ -0,0 +1 @@
+DROP INDEX provisioner_jobs_worker_id_organization_id_completed_at_idx;

coderd/database/migrations/000363_optimize_getprovisionerdaemonswithstatusbyorganization_query.up.sql

@@ -0,0 +1,3 @@
+CREATE INDEX provisioner_jobs_worker_id_organization_id_completed_at_idx ON provisioner_jobs (worker_id, organization_id, completed_at DESC NULLS FIRST);
+
+COMMENT ON INDEX provisioner_jobs_worker_id_organization_id_completed_at_idx IS 'Support index for finding the latest completed jobs for a worker (and organization), nulls first so that active jobs have priority; targets: GetProvisionerDaemonsWithStatusByOrganization';