Merge pull request 'Rename node-hosts-file to node-hostname, and refuse one seat claimed under two names (hq ADR 0223 part 3)' (#69) from hostname-module into main

internal/inventory/migrations/0064-a-machines-names-are-one-seats.sql

@@ -0,0 +1,23 @@
+-- A machine's names are one seat's (novox/hq ADR 0223 part 3): `node-hosts-file` is renamed
+-- `node-hostname`, whose holder writes /etc/hostname beside the machine's own lines in /etc/hosts.
+--
+-- A rename is a database update (ADR 0122): the row keeps its verbs, the former name becomes an alias
+-- that resolves to it, so a manifest registered under the old name — the `hosts` module still assigned
+-- while machines move to `hostname` — goes on holding the one seat, and two claimants of it on one
+-- machine are still refused.
+--
+-- **Both rows may exist when this runs**, as 0048 found for the artifact store: a controller whose
+-- compiled defaults carry the new name may seed it before this migration. Then the old row's holding
+-- moves to it and the old row goes; otherwise the old row is renamed. Either way the old name becomes
+-- an alias.
+update seat_holding set seat = 'node-hostname'
+  where seat = 'node-hosts-file'
+    and exists (select 1 from seat where name = 'node-hostname');
+delete from seat
+  where name = 'node-hosts-file'
+    and exists (select 1 from seat where name = 'node-hostname');
+update seat set name = 'node-hostname', decided = 'novox/hq ADR 0199, ADR 0223'
+  where name = 'node-hosts-file';
+insert into seat_alias (alias, seat) values ('node-hosts-file', 'node-hostname')
+  on conflict (alias) do update set seat = excluded.seat;
+update seat_alias set seat = 'node-hostname' where seat = 'node-hosts-file';