Issue title: SQLite slow after 0.9.2
 Issue body: sqlite is slow after 0.9.2.

Issue is the cache store has bool? useCache = false in some methods instead of bool? useCache = null
 Comments: 
 Comment 0: fixed
{'source': 'GithubIssues', 'repo_name_with_owner': 'revenz/FileFlows', 'issue_id': 1313792984, 'repo_stars': 169.0}