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## Thinking Path > - Paperclip manages work performed by AI agents. > - Server replacement must preserve retained Runner sessions. > - Older sessions can retain controller checkpoints on the server volume. > - The existing importer requires all execution writers to stop, including unrelated runs. > - This change adds a separate online path for successful, settled sources. > - It locks the source task and finalizer while it reads and publishes that source. > - Unrelated work continues. The offline importer keeps its existing authority. ## Linked Issues or Issue Description **What happened?** A retained controller checkpoint cannot be converted by the existing maintenance importer while another task runs. Requiring a busy server to become globally idle prevents online migration. **Expected behavior** An operator can convert a successful retained source after its finalizer releases ownership, while unrelated tasks continue. An expired owner remains an owner. Related active work and uncertain evidence remain blocked. **Steps to reproduce** 1. Retain a valid legacy controller for a successful run with an accepted result and a released committed finalizer. 2. Start a different task. 3. Run controller preparation. The old importer refuses because execution writers are active. Related preservation contracts: #19038 and #19024. This change does not replace workspace migration or authorize volume removal. ## What Changed - Add `prestageNativeControllers` with task, finalizer, and source-run row locks. Recheck related runs and exact checkpoint identity under those locks. - Allow legacy checkpoint material through normal settled-owner import checks. Keep offline authority separate. - Compare captured local controller and supervisor bytes before commit. A changed source rolls back publication. - Add `--controllers-only` to the existing finite native preparation entry. This avoids re-reading provider archives during controller conversion. - Add PostgreSQL cases for unrelated work, expired owners, related active work, source-lock contention, and source changes. - Document the finite command and its limits. ## Verification - Real PostgreSQL affected suites: 56 passed across controller migration and recovery. A first per-server run was interrupted because it was slow; the completed run used the repository's shared PostgreSQL test wrapper. - Initial online cases: 3 passed, covering unrelated work, an expired owner, and related active work. - Source lock and changed-file cases: 2 passed. Publication rolled back on a source change. - Final source-evidence regression: 2 passed. A first unproven source deferred and a later valid source imported; changed-file rollback remained intact. - Server TypeScript check passed with the SDK and Runner declarations built. - Server package build passed, including the Runner vendor checks and compiled command. - Runtime bundling suite: 10 passed. - Full repository CI and exact-head automated review remain required before merge. This draft is not staging acceptance. - PASS: 7 CLI cases after adding the controller-only dependency fixture and explicit-mode coverage. The first CI run exposed missing mock/export coverage; the fixture repair passed after rebase. - The unrelated model-default failures were fixed on master; this branch now includes that fix. ## Risks - A source task can wait briefly on its own migration lock. A one-second lock acquisition budget defers a contended source. No global admission hold is acquired. - Only successful sources with a released committed finalizer are eligible. Failed or unsettled sources stay deferred and require their preservation owners. - The operator must run the command on the host that owns the original files. The command does not certify enrollment readiness or detach any volume. - The existing offline path remains unchanged and still requires stopped writers. ## Model Used OpenAI Codex, GPT-6 family, with reasoning, tool use, and code execution. The exact serving model ID and context window are not exposed in this session. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>