A metadata reply that arrived after its data source was deactivated, deleted, edited or after a project switch could bring back the Connected indicator and the cleared schemas, tables, columns or completion, and an obsolete chain could issue further requests. Requests now carry project / source / target lifetimes (requests.ts); forget() starts a new lifetime, and late replies, introspection steps and follow-up requests of an ended lifetime are dropped. Completed writes keep their result but no longer revive an old connection.
Co-authored-by: LunarFeller <269972968+LunarFeller@users.noreply.github.com>
