close archive on job completion (#417)

gallery_dl/job.py

@@ -266,6 +266,8 @@ class DownloadJob(Job):
         if self.postprocessors:
             for pp in self.postprocessors:
                 pp.finalize()
+        if self.archive:
+            self.archive.close()
 
     def handle_skip(self):
         self.out.skip(self.pathfmt.path)

gallery_dl/util.py

@@ -733,6 +733,7 @@ class DownloadArchive():
     def __init__(self, path, extractor):
         con = sqlite3.connect(path)
         con.isolation_level = None
+        self.close = con.close
         self.cursor = con.cursor()
         self.cursor.execute("CREATE TABLE IF NOT EXISTS archive "
                             "(entry PRIMARY KEY) WITHOUT ROWID")