# Introduction
In this PR we're:
- Refactoring the workspace migration action type introducing grain over
metadata and operation type ( for example operation `create` and
metadata `field` )
- Thanks to above point we can now factorize the runner optimistic
rendering out of each runner actions-handler file using the existing
into the generic one ( -3200 lines of code here )
- Still thanks to action type refactor we're able to dynamically compose
the response error type only send data when there's here. No more static
counter and static summary error message. This way we won't have to re
run snapshot every time we add a new entity to the engine ( huge
snapshot diff here )
## Noticeable points:
- We introduce an index update action to avoid any complex typing for
not having one or a tuple of actions instead. Now the drop and insert
logic is directly inferred from the update action handler instead of
being two action ( delete index and create index )
## TODO
- [x] Define base actions types
- [x] Migrate all actions to action type and metadata name pattern (
base actions )
- [x] Refactor flat entity validation type to embed metadata name
- [x] Refactor optimistic rendering within runner
- [x] Refactor legacy cache invalidation switch
- [x] Refactor response error format ( dynamic counter again + no empty
entries )
- [x] Try factorizing and removing redundant nor unused type declaration
in metadata actions type intermediary files
- [x] Adapt front to new response error format
## Remarks
- ~~Should create an issue for generic replace flat entity in related
flat entity maps~~ overkill
- Should create an issue for oneToMany foreignKey being nullable not
always cascade delete optimistic rendering edge case to either docs or
fix it in delete flat entity and related entity ( re-code the pg
cascading behavior )
- We could also factorize the builder to only implement validators and
not the intermediary file
