Merge branch 'determine-desired-sharding-key-feature-category-importers' into 'master'

Add desired sharding keys for importers

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144856



Merged-by: Alper Akgun <aakgun@gitlab.com>
Approved-by: James Nutt <jnutt@gitlab.com>
Approved-by: Alper Akgun <aakgun@gitlab.com>
Co-authored-by: Manoj M J <mmj@gitlab.com>

db/docs/project_relation_exports.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Used to track the generation of relation export files for projects
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90624
 milestone: '15.2'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: project_export_job_id
+        table: project_export_jobs
+        sharding_key: project_id
+        belongs_to: project_export_job