Add consumer for Notification

src/main/resources/sql/functions/follow/find_follows_article_by_target.sql

@@ -0,0 +1,37 @@
+create or replace function find_follows_article_by_target(
+    _target_id uuid,
+    "limit" int default 50,
+    "offset" int default 0,
+    out resource json,
+    out total int
+) language plpgsql as
+$$
+declare
+    _version_id uuid = (select version_id from article where id = _target_id);
+begin
+    select json_agg(t), (
+        select count(f.id)
+        from follow f
+        join article a on f.target_id = a.id
+        where a.version_id = _version_id)
+    into resource, total
+    from (
+        select
+            f.id,
+            f.created_at,
+            f.target_reference,
+            json_build_object('id', f.target_id) as target,
+            json_build_object('id', f.created_by_id) as created_by
+        from follow_article as f
+        join article a on f.target_id = a.id
+        where a.version_id = _version_id
+        order by f.created_at
+        limit "limit" offset "offset"
+    ) as t;
+end
+$$;
+
+-- drop function if exists find_follows_article_by_target(uuid, int, int);
+-- select * from find_follows_article_by_target('32518c76-5c58-3cd1-00cd-7f9d0bb872cd', 20, 0);
+-- select * from find_follows_article_by_target('24a373f4-c321-4006-8d05-3c50f95a561b', 100, 0);
+-- SELECT * FROM find_follows_article_by_target ("_target_id" := '24a373f4-c321-4006-8d05-3c50f95a561b'::uuid, "offset" := 0::int, "limit" := 300::int)