[stable/2023.1] Tune database values (#1773)

This is an automated cherry-pick of #1744
/assign mnaser
diff --git a/roles/barbican/vars/main.yml b/roles/barbican/vars/main.yml
index 701df96..19677f8 100644
--- a/roles/barbican/vars/main.yml
+++ b/roles/barbican/vars/main.yml
@@ -24,8 +24,10 @@
       DEFAULT:
         log_config_append: null
       database:
-        connection_recycle_time: 10
-        max_pool_size: 1
+        connection_recycle_time: 600
+        max_overflow: 50
+        max_pool_size: 5
+        pool_timeout: 30
       oslo_messaging_notifications:
         driver: noop
       simple_crypto_plugin: