chore: add sequin publication for packages-db tables

Signed-off-by: Joana Maia <jmaia@contractor.linuxfoundation.org>

Author: joanagmaia

backend/src/osspckgs/migrations/V1781009234__createPublicationForSequin.sql

@@ -0,0 +1,52 @@
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_publication WHERE pubname = 'sequin_pub'
+    ) THEN
+        CREATE PUBLICATION sequin_pub
+            FOR TABLE
+                packages,
+                versions,
+                package_dependencies,
+                package_maintainers,
+                package_repos,
+                maintainers,
+                repos,
+                repo_scorecard_checks,
+                advisories,
+                advisory_packages,
+                advisory_affected_ranges
+            WITH (publish_via_partition_root = true);
+    END IF;
+END$$;
+
+ALTER TABLE public.packages                 REPLICA IDENTITY FULL;
+ALTER TABLE public.versions                 REPLICA IDENTITY FULL;
+ALTER TABLE public.package_dependencies     REPLICA IDENTITY FULL;
+ALTER TABLE public.package_maintainers      REPLICA IDENTITY FULL;
+ALTER TABLE public.package_repos            REPLICA IDENTITY FULL;
+ALTER TABLE public.maintainers              REPLICA IDENTITY FULL;
+ALTER TABLE public.repos                    REPLICA IDENTITY FULL;
+ALTER TABLE public.repo_scorecard_checks    REPLICA IDENTITY FULL;
+ALTER TABLE public.advisories               REPLICA IDENTITY FULL;
+ALTER TABLE public.advisory_packages        REPLICA IDENTITY FULL;
+ALTER TABLE public.advisory_affected_ranges REPLICA IDENTITY FULL;
+
+-- versions (32) and package_dependencies (64) are hash-partitioned. REPLICA
+-- IDENTITY on the partitioned root does not cascade; set it on every leaf.
+DO $$
+DECLARE
+    parent_table  text;
+    partition_oid regclass;
+BEGIN
+    FOREACH parent_table IN ARRAY ARRAY['public.versions', 'public.package_dependencies']
+    LOOP
+        FOR partition_oid IN
+            SELECT inhrelid::regclass
+            FROM pg_inherits
+            WHERE inhparent = parent_table::regclass
+        LOOP
+            EXECUTE format('ALTER TABLE %s REPLICA IDENTITY FULL', partition_oid);
+        END LOOP;
+    END LOOP;
+END$$;