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# Which Problems Are Solved
After #12740, setup on existing deployments (v4.17.x → v4.18.0) fails
before migration 78 can add `eventstore.unique_constraints.owners`.
Starting any setup step pushes `system.migration.started`, which inserts
a unique constraint that names the `owners` column. On upgraded
databases that column does not exist yet, so setup dies on
`76_users14_login_equality_indexes` with `SQLSTATE 42703`.
# How the Problems Are Solved
Empty-owner unique-constraint inserts no longer name the `owners`
column:
- `len(Owners) == 0` → `INSERT (instance_id, unique_type, unique_field)`
- tagged `WithOwners(...)` → unchanged `INSERT (..., owners)`
Setup started/done events never stamp owners, so 76–78 can start.
Migration 78 still adds the column; after that, omitted `owners` uses
`DEFAULT '{}'`. Both v2 and v3 pushers apply the same rule. Mixed pushes
split into two INSERT batches so tagged and empty rows do not share a
column list.
# Additional Changes
- v2 SQL mocks now expect the three-column INSERT for untagged adds,
plus tagged and mixed cases
- Pusher tests cover mixed tagged+empty adds and adds against a table
that does not have `owners` yet
- The missing-column pusher test drops `owners` and pushes in one
transaction (`PushWithClient`), then rolls back so the shared test
schema is not mutated. Other tests may stall on `AccessExclusiveLock`
until rollback.
# Additional Context
- Closes#12780
- Follow-up for PR #12740
- Operators do not need to re-run init or apply DDL outside setup
Verified locally:
- `go test ./internal/eventstore ./internal/v2/eventstore/postgres
./internal/eventstore/v3` (including `-race` on those packages)
- Empty-owner insert succeeds when the `owners` column is missing;
tagged insert still requires the column
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Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: Silvan <[email protected]>
