Update pubsub to support lease_seconds

config/migrate-scripts/migrate-db-8e884fe1.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+psql invidious -c "ALTER TABLE channels DROP COLUMN subscribed"
+psql invidious -c "ALTER TABLE channels ADD COLUMN subscribed timestamptz"

config/sql/channels.sql

@@ -8,6 +8,7 @@ CREATE TABLE public.channels
   author text,
   updated timestamp with time zone,
   deleted boolean,
+  subscribed timestamp with time zone,
   CONSTRAINT channels_id_key UNIQUE (id)
 );