# Which Problems Are Solved
During the implementation of #7486 it was noticed, that projections in
the `auth` database schema could be blocked.
Investigations suggested, that this is due to the use of
[GORM](https://gorm.io/index.html) and it's inability to use an existing
(sql) transaction.
With the improved / simplified handling (see below) there should also be
a minimal improvement in performance, resp. reduced database update
statements.
# How the Problems Are Solved
The handlers in `auth` are exchanged to proper (sql) statements and gorm
usage is removed for any writing part.
To further improve / simplify the handling of the users, a new
`auth.users3` table is created, where only attributes are handled, which
are not yet available from the `projections.users`,
`projections.login_name` and `projections.user_auth_methods` do not
provide. This reduces the events handled in that specific handler by a
lot.
# Additional Changes
None
# Additional Context
relates to #7486
* add token exchange feature flag
* allow setting reason and actor to access tokens
* impersonation
* set token types and scopes in response
* upgrade oidc to working draft state
* fix tests
* audience and scope validation
* id toke and jwt as input
* return id tokens
* add grant type token exchange to app config
* add integration tests
* check and deny actors in api calls
* fix instance setting tests by triggering projection on write and cleanup
* insert sleep statements again
* solve linting issues
* add translations
* pin oidc v3.15.0
* resolve comments, add event translation
* fix refreshtoken test
* use ValidateAuthReqScopes from oidc
* apparently the linter can't make up its mind
* persist actor thru refresh tokens and check in tests
* remove unneeded triggers
This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.
* begin init checks for projections
* first projection checks
* debug notification providers with query fixes
* more projections and first index
* more projections
* more projections
* finish projections
* fix tests (remove db name)
* create tables in setup
* fix logging / error handling
* add tenant to views
* rename tenant to instance_id
* add instance_id to all projections
* add instance_id to all queries
* correct instance_id on projections
* add instance_id to failed_events
* use separate context for instance
* implement features projection
* implement features projection
* remove unique constraint from setup when migration failed
* add error to failed setup event
* add instance_id to primary keys
* fix IAM projection
* remove old migrations folder
* fix keysFromYAML test
