diff --git a/src/verificationbot/cli.py b/src/verificationbot/cli.py
index 662a956..409e29a 100644
--- a/src/verificationbot/cli.py
+++ b/src/verificationbot/cli.py
@@ -46,9 +46,13 @@ def init(ctx, db_path, from_backup) -> None:
             "You need to enable 'Send Copy to Self' in the Advanced settings for this bot to work."
         )
 
+    # some config defaults; see https://c.delta.chat/classdc__context__t.html#aff3b894f6cfca46cab5248fdffdf083d
+    ac.set_config("bot", "1")
     # disable read receipts; we don't want the bot to send out read receipts if the actual account
     # owner didn't read the message yet
     ac.set_config("mdns_enabled", "0")
+    # delete from device after 1 day to save disk space
+    ac.set_config("delete_device_after", "86400")
 
     # create control group
     if not get_control_group(ac):
@@ -89,7 +93,9 @@ def process_command(
         try:
             qr = ac.check_qr(command.text)
             if qr._dc_lot.state() == 512:
-                dclib.dc_set_config_from_qr(ac._dc_context, as_dc_charpointer(command.text))
+                dclib.dc_set_config_from_qr(
+                    ac._dc_context, as_dc_charpointer(command.text)
+                )
             replytext = str(qr._dc_lot.state()) + ". scanned " + command.text
         except ValueError:
             replytext = "Not a valid OPENPGP4FPR code"