switch sqlite to use WAL mode by default to prevent database locked errors

archivebox/core/settings.py

@@ -107,6 +107,9 @@ DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',
         'NAME': DATABASE_NAME,
+        'OPTIONS': {
+            'init_command': 'PRAGMA journal_mode=wal;',
+        }
     }
 }
 

archivebox/main.py

@@ -125,10 +125,12 @@ ALLOWED_IN_OUTPUT_DIR = {
     'node_modules',
     'package-lock.json',
     'static',
+    'sonic',
     ARCHIVE_DIR_NAME,
     SOURCES_DIR_NAME,
     LOGS_DIR_NAME,
     SQL_INDEX_FILENAME,
+    f'{SQL_INDEX_FILENAME}-wal',
     JSON_INDEX_FILENAME,
     HTML_INDEX_FILENAME,
     ROBOTS_TXT_FILENAME,