Reference the scrubber db model upgrade (from version 1 to 2)

Yet another missing part.

Related to swh/infra/sysadm-environment#4228 (closed)

---

Migrated from D7912 (view on Phabricator)

swh/scrubber/sql/upgrades/2.sql

+-- SWH Scrubber DB schema upgrade
+-- from_version: 1
+-- to_version: 2
+-- description: Add fixed_objects
+
+create table fixed_object
+(
+  id                    swhid not null,
+  object                bytea not null,
+  method                text,
+  recovery_date         timestamptz not null default now()
+);
+
+comment on table fixed_object is 'Each row identifies an object that was found to be corrupt, along with the original version of the object';
+comment on column fixed_object.object is 'The recovered object itself, as a msgpack-encoded dict';
+comment on column fixed_object.recovery_date is 'Moment the object was recovered.';
+comment on column fixed_object.method is 'How the object was recovered. For example: "from_origin", "negative_utc", "capitalized_revision_parent".';
+
+-- fixed_object
+
+create unique index concurrently fixed_object_pkey on fixed_object(id);
+alter table fixed_object add primary key using index fixed_object_pkey;