refactoring: move sql files

resources/sql/functions/article/find_article_by_id.sql

@@ -0,0 +1,18 @@
+create or replace function find_article_by_id(in id uuid, out resource json) language plpgsql as
+$$
+declare
+    _id alias for id;
+begin
+    select to_json(t)
+    from (
+        select
+            a.*,
+            find_citizen_by_id(a.created_by_id) as created_by
+        into resource
+        from article as a
+        where a.id = _id
+    ) as t;
+end;
+$$;
+
+-- drop function if exists find_article_by_id(uuid, out json);

resources/sql/functions/article/find_last_article_by_version_id.sql

@@ -0,0 +1,20 @@
+create or replace function find_last_article_by_version_id(in version_id uuid, out resource json) language plpgsql as
+$$
+declare
+    _version_id alias for version_id;
+begin
+    select to_json(t)
+    from (
+        select
+            a.*,
+            find_citizen_by_id(a.created_by_id) as created_by
+        into resource
+        from article as a
+        where a.version_id = _version_id
+        order by a.version_number desc
+        limit 1
+    ) as t;
+end;
+$$;
+
+-- drop function if exists find_last_article_by_version_id(uuid, inout json);

resources/sql/functions/article/upsert_article.sql

@@ -0,0 +1,32 @@
+create or replace procedure upsert_article(inout resource json)
+    language plpgsql as
+$$
+declare
+    new_id uuid;
+begin
+    insert into article (version_id, created_by_id, title, annonymous, content, description, tags)
+    select
+       version_id,
+       (resource#>>'{created_by, id}')::uuid,
+       title,
+       annonymous,
+       content,
+       description,
+       tags
+    from json_populate_record(null::article, resource)
+    returning id into new_id;
+
+    if resource->>'relations' is not null then
+        insert into article_relations (source_id, target_id, created_by_id)
+        select
+            (resource->>'id')::uuid,
+            id,
+            (resource#>>'{created_by, id}')::uuid
+        from json_populate_recordset(null::article, resource->>'relations');
+    end if;
+
+    select find_article_by_id(new_id) into resource;
+end;
+$$;
+
+-- drop procedure if exists upsert_article(inout json);