Improve performance of update_z_indexes stored procedure by temporari…

…ly disabling triggers.

packages/api/migrations/committed/000288.sql

@@ -0,0 +1,29 @@
+--! Previous: sha1:38f62a9cfc5d9c555f68f320b486722c2454c64c
+--! Hash: sha1:a39327252c79d7c4093213cfa1f7c74b411ae2c3
+
+-- Enter migration here
+CREATE OR REPLACE FUNCTION public.update_z_indexes("dataLayerIds" integer[]) RETURNS SETOF public.data_layers
+    LANGUAGE plpgsql SECURITY DEFINER
+    AS $$
+  declare
+    z int;
+    pid int;
+  begin
+    if (select count(distinct(project_id)) from data_layers where id = any("dataLayerIds")) > 1 then
+      raise 'Denied. Attempting to modify more than one project.';
+    end if;
+    if (session_is_admin((select project_id from data_layers where id = any("dataLayerIds") limit 1))) != true then
+      raise 'Unauthorized';
+    end if;
+    -- Disable triggers to prevent unnecessary checks which could cause
+    -- deadlocks if rapidly updating z-indexes on a large number of layers.
+    SET session_replication_role = replica;
+    z = 0;
+    for i in array_lower("dataLayerIds", 1)..array_upper("dataLayerIds", 1) loop
+      z = z + 1;
+      update data_layers set z_index = z where id = "dataLayerIds"[i];
+    end loop;
+    SET session_replication_role = DEFAULT;
+    return query (select * from data_layers where id = any("dataLayerIds"));
+  end
+$$;

packages/api/schema.sql

@@ -13560,11 +13560,13 @@ CREATE FUNCTION public.update_z_indexes("dataLayerIds" integer[]) RETURNS SETOF
     if (session_is_admin((select project_id from data_layers where id = any("dataLayerIds") limit 1))) != true then
       raise 'Unauthorized';
     end if;
+    SET session_replication_role = replica;
     z = 0;
     for i in array_lower("dataLayerIds", 1)..array_upper("dataLayerIds", 1) loop
       z = z + 1;
       update data_layers set z_index = z where id = "dataLayerIds"[i];
     end loop;
+    SET session_replication_role = DEFAULT;
     return query (select * from data_layers where id = any("dataLayerIds"));
   end
 $$;