Commit adds db from each session.

src/morethantext/cache.rs

@@ -41,7 +41,10 @@ impl Cache {
     }
 
     pub fn commit(&mut self, data: Store) -> FromCache {
-        self.data.insert(ENTRY.to_string(), data).unwrap();
+        let store = self.data.get_mut(ENTRY).unwrap();
+        for name in data.list() {
+            store.add(name).unwrap();
+        }
         FromCache::Ok
     }
 }