diff --git a/sql/upgrades/034.sql b/sql/upgrades/034.sql
new file mode 100644
index 00000000..6b5b5d14
--- /dev/null
+++ b/sql/upgrades/034.sql
@@ -0,0 +1,71 @@
+-- SWH DB schema upgrade
+-- from_version: 33
+-- to_version: 34
+-- description: update swh_revision_list{,children} with limits and parents
+
+insert into dbversion(version, release, description)
+      values(34, now(), 'Work In Progress');
+
+DROP FUNCTION swh_revision_list(root_revision sha1_git);
+
+DROP FUNCTION swh_revision_list_children(root_revision sha1_git);
+
+DROP FUNCTION swh_revision_log(root_revision sha1_git);
+
+CREATE OR REPLACE FUNCTION swh_revision_find_occurrence(revision_id sha1_git) RETURNS occurrence
+    LANGUAGE sql STABLE
+    AS $$
+	select origin, branch, revision
+  from swh_revision_list_children(revision_id) as rev_list
+	left join occurrence_history occ_hist
+  on rev_list.id = occ_hist.revision
+	where occ_hist.origin is not null
+	order by upper(occ_hist.validity)  -- TODO filter by authority?
+	limit 1;
+$$;
+
+CREATE OR REPLACE FUNCTION swh_revision_list(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS TABLE(id sha1_git, parents bytea[])
+    LANGUAGE sql STABLE
+    AS $$
+    with recursive rev_list(id) as (
+	(select id from revision where id = root_revision)
+	union
+	(select parent_id
+	 from revision_history as h
+	 join rev_list on h.id = rev_list.id)
+    )
+    select rev_list.id as id, array_agg(rh.parent_id::bytea order by rh.parent_rank) as parent from rev_list
+    left join revision_history rh on rev_list.id = rh.id
+    group by rev_list.id
+    limit num_revs;
+$$;
+
+CREATE OR REPLACE FUNCTION swh_revision_list_children(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS TABLE(id sha1_git, parents bytea[])
+    LANGUAGE sql STABLE
+    AS $$
+    with recursive rev_list(id) as (
+	(select id from revision where id = root_revision)
+	union
+	(select h.id
+	 from revision_history as h
+	 join rev_list on h.parent_id = rev_list.id)
+    )
+    select rev_list.id as id, array_agg(rh.parent_id::bytea order by rh.parent_rank) as parent from rev_list
+    left join revision_history rh on rev_list.id = rh.id
+    group by rev_list.id
+    limit num_revs;
+$$;
+
+CREATE OR REPLACE FUNCTION swh_revision_log(root_revision sha1_git, num_revs bigint = NULL::bigint) RETURNS SETOF revision_entry
+    LANGUAGE sql STABLE
+    AS $$
+    select t.id, r.date, r.date_offset,
+           r.committer_date, r.committer_date_offset,
+           r.type, r.directory, r.message,
+           a.name, a.email, c.name, c.email, r.metadata, r.synthetic,
+           t.parents
+    from swh_revision_list(root_revision, num_revs) as t
+    left join revision r on t.id = r.id
+    left join person a on a.id = r.author
+    left join person c on c.id = r.committer;
+$$;