Port Changes

Porting a change onto this branch

One run = one port, onto the branch already checked out. The current branch is the destination — never switch, create, or rename branches, and never chain hops. A multi-hop port (3.22 → 3.23 → main) is separate runs on separate workspaces; if the user asks for more than one hop, do the one that matches this branch and tell them to ask again on the next branch.

1. Establish source and direction

• The user points at a PR (gh pr view <n> --json baseRefName,files, gh pr diff <n>) or a branch.
• Source = where the change was originally authored (PR base). Destination = the current branch (git branch --show-current; main is the next unreleased version — check # 3.X.0 [Unreleased] at the top of CHANGELOG.md).
• UP (forward-port): source older than destination (3.22 → 3.23/main).
• DOWN (backport): source newer than destination (main → 3.23).
• State the direction you inferred in your first message, so a wrong guess is caught early.

2. GraphQL: pin to the oldest version that ships it

The ADDED_IN_* marker names when the field/mutation first became available, not which branch you are editing. Constants live in saleor/graphql/core/descriptions.py.

• A change first released in 3.22 keeps ADDED_IN_322 here too, even on main.
• A DOWN port to a version older than the marker makes the field ship earlier than the marker claims — use the older version's marker here, and tell the user the source branch's marker needs the same correction (don't go edit it yourself).
• If the introducing version is ambiguous, ask the user. Don't guess.
• Regenerate saleor/graphql/schema.graphql — see saleor-graphql-api-change.

3. Migrations: keep the oldest branch's identity, merge on top

Migration numbering diverges per branch, so a straight cherry-pick produces a broken graph.

• The migration keeps the file name and number it has on the oldest branch that ships it — never renumber or rewrite a migration that already shipped.
• On an UP port, if that number now collides with migrations that landed only here, resolve the two leaves with a merge migration (python manage.py makemigrations --merge) — see existing *_merge_*.py files for the shape.
• On a DOWN port where this branch is now the oldest to ship it, pick the number that fits here and tell the user the newer branches must reuse this name.
• Zero-downtime rules still apply: CREATE INDEX CONCURRENTLY in its own atomic = False migration, schema and data migrations split. See saleor-migrations.

4. CHANGELOG: only on the branch that introduces the change

• Edit CHANGELOG.md only if this branch is the first release to ship the change.
• UP port of something already released in 3.23 → no CHANGELOG edit here; it was already announced.
• DOWN port → add the entry here (this release now introduces it) and tell the user to drop it from main's [Unreleased] section.
• main's CHANGELOG is edited only when the change debuts in [Unreleased] and is not backported.

5. Before finishing

• Tests for the ported code pass (pytest --reuse-db <paths>, see pytest-runner).
• Schema file regenerated if GraphQL changed; pre-commit clean.
• If this branch lacks a dependency the source relied on, stop and report it — don't invent a partial port.
• Report anything the user must fix on the other branches (marker corrections, migration names, CHANGELOG moves) — you are not touching those branches.

Do not push. Commit only if explicitly asked.