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# Which Problems Are Solved Milestones used existing events from a number of aggregates. OIDC session is one of them. We noticed in load-tests that the reduction of the oidc_session.added event into the milestone projection is a costly business with payload based conditionals. A milestone is reached once, but even then we remain subscribed to the OIDC events. This requires the projections.current_states to be updated continuously. # How the Problems Are Solved The milestone creation is refactored to use dedicated events instead. The command side decides when a milestone is reached and creates the reached event once for each milestone when required. # Additional Changes In order to prevent reached milestones being created twice, a migration script is provided. When the old `projections.milestones` table exist, the state is read from there and `v2` milestone aggregate events are created, with the original reached and pushed dates. # Additional Context - Closes https://github.com/zitadel/zitadel/issues/8800