MOPC-App/docs/round-redesign-architecture.../mixed-round-design-implemen.../phase-02-backend-orchestration/overview.md

# Phase 02 Overview: Backend Orchestration Engine

## Objective
Implement deterministic runtime behavior for stage transitions, routing, filtering, assignment, live cursor control, and notification/audit emission.

## In Scope

- transition engine
- routing engine
- filtering orchestration (gates + AI + manual queue)
- assignment orchestration with coverage guarantees
- live cursor and cohort window controls
- event and audit emission

## Out of Scope

- full admin UI and participant UI implementation

## Exit Criteria

1. Runtime contracts implemented and integration-tested.
2. Determinism and idempotency guarantees proven for critical mutations.
3. Mandatory phase gates complete with test evidence.
Round system redesign: Phases 1-7 complete Full pipeline/track/stage architecture replacing the legacy round system. Schema: 11 new models (Pipeline, Track, Stage, StageTransition, ProjectStageState, RoutingRule, Cohort, CohortProject, LiveProgressCursor, OverrideAction, AudienceVoter) + 8 new enums. Backend: 9 new routers (pipeline, stage, routing, stageFiltering, stageAssignment, cohort, live, decision, award) + 6 new services (stage-engine, routing-engine, stage-filtering, stage-assignment, stage-notifications, live-control). Frontend: Pipeline wizard (17 components), jury stage pages (7), applicant pipeline pages (3), public stage pages (2), admin pipeline pages (5), shared stage components (3), SSE route, live hook. Phase 6 refit: 23 routers/services migrated from roundId to stageId, all frontend components refitted. Deleted round.ts (985 lines), roundTemplate.ts, round-helpers.ts, round-settings.ts, round-type-settings.tsx, 10 legacy admin pages, 7 legacy jury pages, 3 legacy dialogs. Phase 7 validation: 36 tests (10 unit + 8 integration files) all passing, TypeScript 0 errors, Next.js build succeeds, 13 integrity checks, legacy symbol sweep clean, auto-seed on first Docker startup. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> 2026-02-13 13:57:09 +01:00			`# Phase 02 Overview: Backend Orchestration Engine`

			`## Objective`
			`Implement deterministic runtime behavior for stage transitions, routing, filtering, assignment, live cursor control, and notification/audit emission.`

			`## In Scope`

			`- transition engine`
			`- routing engine`
			`- filtering orchestration (gates + AI + manual queue)`
			`- assignment orchestration with coverage guarantees`
			`- live cursor and cohort window controls`
			`- event and audit emission`

			`## Out of Scope`

			`- full admin UI and participant UI implementation`

			`## Exit Criteria`

			`1. Runtime contracts implemented and integration-tested.`
			`2. Determinism and idempotency guarantees proven for critical mutations.`
			`3. Mandatory phase gates complete with test evidence.`