Add query time tracking to IO Events.

hasura/migrations/1619110268248_create_table_public_ioevents/down.yaml

@@ -0,0 +1,5 @@
+- args:
+    cascade: false
+    read_only: false
+    sql: DROP TABLE "public"."ioevents";
+  type: run_sql

hasura/migrations/1619110268248_create_table_public_ioevents/up.yaml

@@ -0,0 +1,11 @@
+- args:
+    cascade: false
+    read_only: false
+    sql: CREATE TABLE "public"."ioevents"("id" bigserial NOT NULL, "created_at" timestamptz
+      NOT NULL DEFAULT now(), "operationname" text NOT NULL, "time" numeric, PRIMARY
+      KEY ("id") );
+  type: run_sql
+- args:
+    name: ioevents
+    schema: public
+  type: add_existing_table_or_view