Merged in bugfix/errhandling (pull request #89)

Error handling

* basic

database/queries/clean.sql

@@ -3,7 +3,12 @@ SELECT EXISTS(
     SELECT 1 FROM currentCleanEntries WHERE documentId = @documentId
 );
 
--- name: GetDocumentCleanEntry :one
+-- name: GetCleanEntry :one
+SELECT id, documentId, bucket, key, version, mimetype, fail
+    FROM currentCleanEntries
+    WHERE id = @cleanId;
+
+-- name: GetCleanEntryByDocId :one
 SELECT id, documentId, bucket, key, version, mimetype, fail
     FROM currentCleanEntries
     WHERE documentId = @documentId;