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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Projects group tasks. Agents run tasks as heartbeat runs. > - Today, workspace mode and shared-workspace flags decide whether tasks run at the same time. A project cannot set its own limit on concurrent task executions. > - A correct project limit must count every project that a task uses, including @-mentioned projects. It must also keep the count when a project is archived or deleted, and when a run is admitted more than one time. > - This change cannot go into one pull request with claims and settlement. Thus this pull request adds only the policy semantics and the durable accounting storage that later claims will use. > - This pull request adds a new `execution-admission` module, three tables and the deletion guards. No route writes a cap and no claim path enforces it. > - The benefit is a tested storage contract (constraints, idempotency, rollback, indexed counts, lifecycle preservation) before any behavior changes. ## Linked Issues or Issue Description Refs #2831, Refs #14333 (related agent-level and adapter-level limits; not duplicates). **Subsystem affected** Server execution admission (new module `server/src/modules/execution-admission/`) and the `packages/db` schema. **Problem or motivation** A project cannot limit how many of its task executions are active. The current shared-workspace flags mix resource safety with capacity. A future project limit needs storage that records each admission attempt and every project that the attempt charges. Run IDs cannot be the identity, because a run can be released before dispatch and admitted again. **Proposed solution** Add a separate policy table that keeps "never configured" apart from "explicit no limit". Add admission epochs with one charge row per distinct project. Settlement deletes the charge set in one transaction. Later pull requests integrate claims, settlement, waits and the public control. **Alternatives considered** Columns on `projects` would leak an unenforced cap through every project reader. A project column or a `uuid[]` on `heartbeat_runs` cannot enforce per-project uniqueness or company scope. `budget_reservations` has no project set. A counter would be a second source of truth. ## What Changed - Added `project_task_execution_policies`. No row means never configured. A null maximum means an explicit "no limit". A check accepts only positive maximums. A composite foreign key keeps the project and company together. The row is deleted with its project. - Added `execution_admissions`. Each row is one admission attempt of a run: `(run_id, attempt)` is unique, and a partial unique index allows one unsettled attempt per run. It keeps the context revision, the nullable primary project (provenance, no foreign key) and the settlement identity. A check sets `settlement_id` and `settled_at` together. - Added `execution_admission_project_charges`. It has one row per distinct admitted project, unlimited projects included. Composite foreign keys keep the admission and the project in one company. The project foreign key has no cascade, so a charge cannot disappear with its project. `(company_id, project_id)` is indexed for active counts. - Added migration `0426_absent_guardian.sql` (renumbered from `0423`, then `0425`, as master added `0423`–`0425`). The generated SQL was reordered so the unique indexes exist before the composite foreign keys that need them. Snapshots `0419` and `0420` were pruned to keep five snapshots. - Added the `execution-admission` module (domain → application → adapters): - Domain: policy patch parsing and application (omitted keeps, null clears, partial updates keep other fields, malformed values are rejected), canonical project-set preparation (primary ∪ references, deduplicated, ascending, bounded with an explicit `too_many_projects` result), and the settlement replay decision. - Application: internal `readTaskExecutionPolicy` and `updateTaskExecutionPolicy` commands. No route, tool, CLI or import calls them. - Adapter: the project-set lock (`FOR NO KEY UPDATE`, ascending, one statement), the policy store, and the storage transitions `recordAdmission`, `settleAdmission` and `countActiveProjectCharges`. These transitions are not exported from the module entry point. Claims (later) must add the capacity check and the lifecycle evidence. - Project deletion returns `409 project_execution_admission_pending` while the project has a charge. Agent deletion returns `409 agent_execution_admission_pending` while its runs have an unsettled admission, and removes settled history. Company deletion calls a new module participant before it deletes runs and projects. - Documented the tables, the lifecycle rules and the proposed global lock order in `doc/DATABASE.md`. Added module ownership to `server/src/modules/README.md`. ## Verification - `cd server && npx vitest run src/modules/execution-admission` → 2 files, 26 tests pass (the Greptile finding on an empty primary ID added an assertion to an existing test). The adapter tests use embedded PostgreSQL and cover: - policy semantics, the maximum check and the company foreign key; - charges for every distinct project, a primaryless set and an empty set (no rows); - replay of one admission ID, conflict on a changed record, refusal of a second live attempt and the partial unique index; - settlement of the whole set once, replay, a different settlement, then attempt 2 for the same run; - company isolation of projects, runs and admission IDs, the duplicate-charge key, and rollback of an aborted transaction; - active counts per project, and an `EXPLAIN` that uses `execution_admission_project_charges_project_idx`; - archive keeps charges, `projectService.remove` returns 409, a direct project delete fails on the foreign key, and delete succeeds after settlement; - `deleteAgentDependencies` returns 409 while unsettled, and `deleteCompany` removes only that company's admissions. - `cd packages/db && npx vitest run src/execution-admission-migration.test.ts` → pass. It removes the new tables and receipt, seeds a legacy project and run, applies pending migrations, and compares the existing rows. - `pnpm --filter @paperclipai/db check:migrations` → pass. Five snapshots remain (`0421`, `0422`, `0424`, `0425`, `0426`; `0423` is SQL-only on master). - `node scripts/check-module-boundaries.mjs` → pass. - `packages/db` `tsc --noEmit` → pass. A scoped `tsc` of the module entry points and domain tests → pass. - Existing tests for the changed deletion services → 6 files, 161 tests pass (`resource-lifecycle-events`, `prompt-injection-prevention`, `agent-lifecycle/lifecycle`, `case-deletion`, `project-workspace-root-provenance`, `companies-service`). - Not run locally: the full `server` typecheck. `tsc` and `tsgo` were stopped by the out-of-memory killer on the 7 GB machine (exit 137, also single-threaded). The full `pnpm -r typecheck`, `pnpm test:run` and `pnpm build` were not run locally; CI ran them on head `520b69d553`: all gates pass, including Typecheck, Build and the 12 server test shards. After merging master (`1c9ca5829f`) into head `c088729361`, the migration check, migration upgrade test, module tests, module-boundary check and `packages/db` typecheck were rerun locally and pass; CI is rerunning the full suite. ## Risks - Migration risk is low. It creates three empty tables and indexes. It does not change existing tables or rows. - Behavior changes only when admission rows exist. Nothing writes them yet, so project, agent and company deletion behave as before. - Later claim work must take the project-set lock in the documented order. A claim that takes project locks after issue locks could deadlock with project deletion. - Settlement deletes charge rows, so a settled admission keeps its primary project and context revision but not its full project set. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used - Anthropic Claude Opus 5.5 (`claude-opus-5-5`) in Claude Code, with tool use (shell, file edits, embedded PostgreSQL tests). Default context window and reasoning mode. ## 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: nickyleach <331803+nickyleach@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Paperclip <noreply@paperclip.ing>