Functional Isolation Level
```

                               +------------------+
                        +------>  Application     |
                        |      |                  |
                        |      |  📃 local changes +-+
                        |      |                  | |
                        |      +------------------+ |
                        |                           |
                        |                           |
                        |                           |
           +------------+-------------+      +------v----------------+
           |📃  Frozen Snapshot       |      |📃 persisted changes  |
           +---------^----------^-----+      +------+----------------+
                     |          |                   |
                     |          |                   |
                     |          |                   |
                     |          |                   |
                     |          |                   |
           +---------+------+   |           +-------v-------+
           |🔨 Setup Forecast|   +-----------+🔨 materialize  |
           +--^---------^---+               +-------+-------+
              |         |                           |
              |         |                           |
+-------------+---+  +--+-----------------+         |
|Main History(OSM)|  |Main Foreast(OSMF)  <---------+
+-----------------+  +--------------------+

```