1%%{init: {'theme': 'neutral'}}%%
2classDiagram
3    class Store {
4        +Map items
5        +get(key) Item
6        +put(data) Hash
7    }
8    class CAS {
9        +putBlob(bytes) Hash
10        +getBlob(hash) Bytes
11    }
12    class DB {
13        +execute(sql) Rows
14        +transaction(fn) Result
15    }
16    Store --> CAS : content
17    Store --> DB : metadata
18