Update docs and return a better error message

builtin/logical/database/backend.go

@@ -106,7 +106,7 @@ func (b *databaseBackend) createDBObj(s logical.Storage, name string) (dbplugin.
 func (b *databaseBackend) DatabaseConfig(s logical.Storage, name string) (*DatabaseConfig, error) {
 	entry, err := s.Get(fmt.Sprintf("config/%s", name))
 	if err != nil {
-		return nil, fmt.Errorf("failed to read connection configuration with name: %s", name)
+		return nil, fmt.Errorf("failed to read connection configuration: %s", err)
 	}
 	if entry == nil {
 		return nil, fmt.Errorf("failed to find entry for connection with name: %s", name)

website/source/api/secret/databases/index.html.md

@@ -162,11 +162,13 @@ This endpoint creates or updates a role definition.
 - `db_name` `(string: <required>)` - The name of the database connection to use
   for this role. 
 
-- `default_ttl` `(string: <required>)` - Specifies the TTL for the lease
-  associated with this role. 
+- `default_ttl` `(string/int: 0)` - Specifies the TTL for the leases
+  associated with this role. Accepts time suffixed strings ("1h") or an integer
+  number of seconds. Defaults to system/backend default TTL time.
 
-- `max_ttl` `(string: <required>)` - Specifies the maximum TTL for the lease
-  associated with this role. 
+- `max_ttl` `(string/int: 0)` - Specifies the maximum TTL for the leases
+  associated with this role. Accepts time suffixed strings ("1h") or an integer
+  number of seconds. Defaults to system/backend default TTL time.
 
 - `creation_statements` `(string: <required>)` – Specifies the database
   statements executed to create and configure a user. Must be a