Remove FF update_init_iid_to_read_from_ci_pipeline_iids
What does this MR do and why?
The feature flag update_init_iid_to_read_from_ci_pipeline_iids was globally rolled out on 2025-12-05. It is deemed stable and is now being removed.
Feature summary:
The Ci::Pipeline model's init function now checks the max iid value in the new table p_ci_pipeline_iids in addition to checking p_ci_pipelies. This init function is called by InternalId#initial_value to recalculate last_value when the record doesn't already exist (which can happen when we run InternalId.flush_records! or when a new project is created.)
Further details can be found in the MR that introduced the FF: !213992 (merged).
References
How to set up and validate locally
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In a new project, you can verify that creating a new pipeline multiple times succeeds as usual.
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You can also confirm the behaviour when a duplicate iid is attempted to be inserted into a different partition. Follow the steps in !213457 (merged).
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