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<!-- entire-trail-link-start --> https://entire.com/gh/paperclipai/-/trails/94/changes/paperclip/94 <!-- entire-trail-link-end --> ## Thinking Path > - Paperclip manages AI agents and their work. > - Native agents resume prior provider sessions from saved run checkpoints. > - Resume selection must respect every newer progress barrier. > - The prior query returned large context and profile JSON for up to 32 candidates. > - Most candidates need only process, status, binding, and checkpoint-presence checks. > - This PR selects the same source in one SQL snapshot and returns only its required payloads. > - This reduces database response bytes while preserving session authority and saved task context. ## Linked Issues or Issue Description **What existing behavior does this improve?** Native task/session resume selection in `findNativeSessionResumeRun`. **Current behavior** At baseline `bf3ef12f3a78d0b15a32ad57f7e16520fbf6cd5e`, a resume lookup reads complete context and profile JSON for up to 32 runs, then reads provider-event evidence. A synthetic 15-run history returns about 4.44 MB even though one checkpoint is selected. **Proposed behavior** A bounded CTE finds the first checkpoint or progress barrier. The same SQL statement returns the selected source's native input, checkpoint, tool fingerprint, wake envelope, canonical task brief, and process identity. All fallback barriers and the 32-run limit stay in place. **Reason and benefit** Rejected candidates no longer transfer saved prompts and execution inputs to Node. A single snapshot also prevents a gap between candidate selection and payload hydration. **Breaking changes** None to public APIs or stored history. This private service returns the fields consumed by runtime selection and checkpoint rebinding. It keeps complete required nested values and distinguishes missing brief fields from explicit JSON nulls. **Additional context** Checked `ROADMAP.md`. This is a targeted improvement to existing resume behavior. Public searches for native session resume projections found no duplicate. Related work includes #6573 (durable agent sessions) and #17011 (managed Claude resume opt-in); neither changes this database read. Provider-refusal recovery in #17676 is a separate concern and is unchanged. ## What Changed - Select the newest progress barrier within the existing exact company/agent/task/session and 32-run window in one SQL snapshot. - Return three required profile fields, the full wake envelope, and the saved task's ID, title, and description only for the selected source. - Preserve invalid non-null checkpoint barriers, provider evidence, process authority, terminal-status rules, timestamp precision, and exact string binding checks. - Add real PostgreSQL regression coverage and a reproducible baseline/treatment benchmark. Document the read and benchmark command. ## Verification - `pnpm -r typecheck` passed. `pnpm build` passed. The final server `tsc --noEmit` also passed. The later benchmark-only relocation passed `pnpm check:module-boundaries` and the real PostgreSQL proof; runtime and regression-test source are unchanged. - Related suites: `native-session-resume-projection.test.ts`, `native-session-resume.test.ts`, `heartbeat/retries.test.ts`, and `heartbeat-retry-scheduling.test.ts`: 78 passed and 54 skipped across 3 passed files and 1 skipped file. Embedded PostgreSQL/platform gates caused the skips. Resume orchestration and the 10 new SQL tests ran against isolated PostgreSQL 17.11. The final 10-test projection rerun passed. - New SQL cases cover all seven provider evidence kinds, each process authority field, all terminal statuses, wrong bindings and runtime, invalid checkpoints, null/scalar/array/object JSON, missing versus null brief fields, the 32-row bound, ordering ties, future barriers, submillisecond timestamps, and a change committed before the one selection statement. - `pnpm test:run` was attempted. The host's embedded PostgreSQL startup failed after five attempts. The broad run recorded failures/skips in embedded-database suites and was stopped after that concrete host limitation (exit 143). It is not a local full-suite pass. The full final-head CI matrix passes on `dcde4e3dac2173321d7be2406e7775af8411826a`: 55 successful checks, one neutral check, and two optional Storybook skips. Greptile completed at 5/5 on that exact head, with zero unresolved findings. The initial benchmark-location policy failure was fixed before this final run. - Reproduce the benchmark with `pnpm --filter @paperclipai/server exec tsx ../scripts/benchmark-native-session-resume-reads.ts --baseline-ref=bf3ef12f3a78d0b15a32ad57f7e16520fbf6cd5e`. The optional `PAPERCLIP_SESSION_RESUME_BENCHMARK_DATABASE_URL` must name an isolated database ending in `_test`. - The harness imports the pinned baseline module, invokes both actual services, captures complete generated SQL and parameters, compares every retained consumer field, and captures `EXPLAIN (ANALYZE, BUFFERS, FORMAT JSON)`. Its incompressible wide fixture keeps a complete 96 KiB native input in the selected result. Raw PostgreSQL text DataRow frames are measured exactly; RowDescription, protocol command metadata, TLS, and TCP are excluded. | Synthetic local case | Baseline DataRow bytes | Treatment DataRow bytes | Reduction | | --- | ---: | ---: | ---: | | 15 runs, one selected checkpoint | 4,441,143 | 104,599 | 97.64% | | 15 unused bootstraps | 4,435,590 | 0 | 100% | | One small selected source | 6,395 | 6,319 | 1.19% | The committed-head benchmark uses two warmups and seven alternating samples per variant. Local round-trip medians and ranges were: | Synthetic local case | Baseline median (range), ms | Treatment median (range), ms | | --- | ---: | ---: | | Wide history | 20.32 (18.63–24.37) | 1.63 (1.40–2.21) | | Unused history | 18.52 (17.63–20.35) | 1.20 (1.13–1.56) | | Small selected source | 1.05 (0.95–1.70) | 0.78 (0.73–1.30) | The small case has overlapping ranges and a 1.19% byte change, so it is neutral. `EXPLAIN` server execution time was higher for the treatment (wide: 0.402 ms versus 0.028 ms across the two baseline statements). `EXPLAIN` does not serialize result rows; the new JSON presence checks do extra server work while avoiding large result transfer. These are local synthetic round-trip measurements, not production latency claims. The final proof ran on `dcde4e3dac2173321d7be2406e7775af8411826a` with no runtime source diff. ## Risks - Selection policy now has a SQL form. Regression tests preserve the pure selector's barrier semantics, including invalid non-null checkpoints and JavaScript Date precision. - Checkpoint-presence checks can still detoast candidate profiles inside PostgreSQL. The change reduces returned bytes; it does not eliminate all database JSON work. - The selected checkpoint, native input, and wake envelope can still be large because consumers require them in full. No new payload cap is introduced. - There is no migration, cache, background polling, ownership lock change, deployment, or merge in this PR. ## Model Used OpenAI GPT-6 through Codex. The host did not expose an exact runtime model ID or context-window size. The agent used reasoning, code execution, real PostgreSQL, and GitHub tools. ## 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 - [x] All Paperclip CI gates are green - [x] 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>