fix: enable faster db recovery (#1020)

diff --git a/roles/nova/vars/main.yml b/roles/nova/vars/main.yml
index 1b9c802..b7a93c2 100644
--- a/roles/nova/vars/main.yml
+++ b/roles/nova/vars/main.yml
@@ -72,6 +72,9 @@
       cors:
         allowed_origin: "*"
         allow_headers: "X-Auth-Token,X-OpenStack-Nova-API-Version"
+      database:
+        connection_recycle_time: 10
+        max_pool_size: 1
       filter_scheduler:
         enabled_filters:
           AvailabilityZoneFilter,