fix: payload performance (#2441)

* change some olap flush settings

* increase timeouts for payload wal

* fix: improve performance of payload wal metrics

* slight updates

* more small tweaks

* undo some olap changes, don't offload some payloads

* remove double reads

* try reducing wal poll limit

* analyze v1_dag

* move partition method

sql/schema/v1-core.sql

@@ -1710,8 +1710,14 @@ BEGIN
 
     EXECUTE format(
         'SELECT ARRAY(
-            SELECT DISTINCT e.tenant_id
-            FROM %I e
+            SELECT t.id
+            FROM "Tenant" t
+            WHERE EXISTS (
+                SELECT 1
+                FROM %I e
+                WHERE e.tenant_id = t.id
+                LIMIT 1
+            )
         )',
         partition_table)
     INTO result;
@@ -1733,9 +1739,15 @@ BEGIN
 
     EXECUTE format(
         'SELECT ARRAY(
-            SELECT DISTINCT e.tenant_id
-            FROM %I e
-            WHERE e.cut_over_at <= NOW()
+            SELECT t.id
+            FROM "Tenant" t
+            WHERE EXISTS (
+                SELECT 1
+                FROM %I e
+                WHERE e.tenant_id = t.id
+                  AND e.cut_over_at <= NOW()
+                LIMIT 1
+            )
         )',
         partition_table)
     INTO result;