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