Add forgotten file

src/sql/upgrade-33.sql

@@ -0,0 +1,7 @@
+create table FailedPaths (
+    path text primary key not null
+);
+
+create rule IdempotentInsert as on insert to FailedPaths
+  where exists (select 1 from FailedPaths where path = new.path)
+  do instead nothing;