Fix database scheme and introduce automatic database migration

src/ddns_service/main.py

@@ -15,7 +15,6 @@ from .cli import (
     cmd_hostname_delete,
     cmd_hostname_list,
     cmd_hostname_modify,
-    cmd_init_db,
     cmd_user_add,
     cmd_user_delete,
     cmd_user_email,
@@ -94,12 +93,14 @@ def build_parser():
         "delete", help="Delete hostname"
     )
     hostname_delete.add_argument("hostname", help="Hostname (FQDN)")
+    hostname_delete.add_argument("zone", help="DNS zone")
     hostname_delete.set_defaults(func=cmd_hostname_delete)
 
     hostname_modify = hostname_subparsers.add_parser(
         "modify", help="Modify hostname"
     )
     hostname_modify.add_argument("hostname", help="Hostname (FQDN)")
+    hostname_modify.add_argument("zone", help="DNS zone")
     hostname_modify.add_argument("--dns-ttl", type=int, help="DNS record TTL")
     hostname_modify.add_argument("--expiry-ttl", type=int, help="Expiry TTL")
     hostname_modify.set_defaults(func=cmd_hostname_modify)
@@ -163,7 +164,7 @@ def main():
 
     # Handle --init-db
     if args.init_db:
-        return cmd_init_db(args, app)
+        return
 
     # Handle --daemon
     if args.daemon: