[server] Add disk usage endpoint

server/sql/queries/resources.sql

@@ -44,6 +44,21 @@ SET
 WHERE id = @id::uuid
 RETURNING *;
 
+-- name: DiskUsage :one
+WITH RECURSIVE nodes(id, parent, size, dir) AS (
+    SELECT r.id, r.parent, r.size, r.dir
+    FROM resources r WHERE r.id = @id::uuid
+  UNION ALL
+    SELECT r.id, r.parent, r.size, r.dir
+    FROM resources r JOIN nodes n on r.parent = n.id
+    WHERE deleted IS NULL
+)
+SELECT
+  SUM(size) AS size,
+  COUNT(*) AS entities,
+  COUNT(CASE dir WHEN true THEN 1 ELSE NULL END) AS dirs,
+  COUNT(CASE dir WHEN false THEN 1 ELSE NULL END) AS files
+FROM nodes;
 
 
 -- name: DeleteRecursive :many