Improve import performance (#261)

* Run import in batches, cache tags

* Use bulk operations for bookmarks and assigning tags

* Improve naming

* Restore bookmark validation

* Add logging

* Bulk create tags

* Use HTMLParser for parsing bookmarks

* add parser tests

* Add more importer tests

* Add more importer tests

* Remove pyparsing dependency

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

siteroot/settings/dev.py

@@ -48,6 +48,11 @@ LOGGING = {
             'level': 'DEBUG',
             'handlers': ['console'],
             'propagate': False,
+        },
+        'bookmarks.services.importer': {  # Log importer debug output
+            'level': 'DEBUG',
+            'handlers': ['console'],
+            'propagate': False,
         }
     }
 }