# SpaceCom Implementation Plan

## Purpose

This document turns the master plan into an implementation-oriented coding plan. It is focused on phases of engineering work and sprint-style delivery, not on full architectural detail.

## Delivery Model

The implementation plan assumes:

- self-hosted GitLab as the delivery platform
- Docker Compose as the baseline deployment model
- contracts as the authoritative entitlement source
- Phase 0 blockers cleared before major coding commitments
- safety-critical, auth, and regulatory-sensitive changes always require human review

## Phase 0: Pre-Build Decisions

Objective:
- clear the decisions that would otherwise force rework

Sprint 0 outcomes:

- Space-Track AUP architecture decision recorded
- Cesium commercial licence executed
- GitLab CI/CD authority confirmed
- contract-driven entitlement model confirmed
- Redis trust split approved
- initial ADR set aligned with these decisions

Exit criteria:

- no unresolved blocker remains that would change ingest, licensing, or deployment direction

## Phase 1: Foundation Sprints

Objective:
- establish the platform baseline and developer workflow

### Sprint 1.1

- backend project structure and FastAPI scaffolding
- frontend project structure and Next.js scaffolding
- Docker Compose topology
- TimescaleDB/PostGIS baseline schema
- GitLab CI skeleton
- docs tree, ADR format, `AGENTS.md`, changelog baseline

### Sprint 1.2

- auth baseline: JWT, cookies, MFA foundation
- RBAC and role checks
- liveness and readiness endpoints
- structured logging
- security scan hooks and pre-commit
- first-login acceptance gates for ToS/AUP/Privacy Notice

Exit criteria:

- full stack starts cleanly
- CI runs on every merge request
- auth and role boundaries exist
- baseline docs and controls are in place

## Phase 2: Data and Ingest Sprints

Objective:
- make the platform ingest and manage real operational data safely

### Sprint 2.1

- object catalog CRUD
- TLE ingest
- ingest worker wiring
- source validation and checksum checks
- basic data freshness indicators

### Sprint 2.2

- DISCOS import
- space weather ingest
- retention policy scaffolding
- ingest metrics and failure alerts
- first degraded-mode backend signals

Exit criteria:

- core upstream data can be ingested, validated, stored, and monitored

## Phase 3: Propagation and Physics Core

Objective:
- deliver the first real analysis engine

### Sprint 3.1

- frame/time utilities
- SGP4 propagation
- frame transformation validation
- initial CZML generation

### Sprint 3.2

- numerical decay predictor
- atmospheric inputs
- upper/lower atmosphere model interfaces for terminal descent
- model versioning hooks
- prediction input validation

Exit criteria:

- the platform can produce technically valid propagated and decay outputs with traceable inputs

## Phase 4: Simulation and Hazard Engine

Objective:
- build the uncertainty and event-analysis layer

### Sprint 4.1

- Monte Carlo job orchestration
- Celery chord flow
- worker resource controls
- result aggregation guards

### Sprint 4.2

- breakup logic and sub/trans-sonic fragment model baseline
- fragment shape, tumble, and descent-assumption reference data
- corridor generation
- object/event linking
- first event orchestration path

Exit criteria:

- multi-run hazard outputs are generated safely, bounded, and auditable

## Phase 5: Operational Frontend

Objective:
- make the product usable for analysts and operators

### Sprint 5.1

- globe and layer controls
- timeline strip
- object/event navigation
- degraded-state presentation

### Sprint 5.2

- alert centre
- acknowledgement flow
- decision prompts
- keyboard-first interaction paths

Exit criteria:

- operators can see, interpret, and act on platform outputs in the UI

## Phase 6: Event Workflow and Reporting

Objective:
- support full event handling, not just display

### Sprint 6.1

- event detail page
- event state transitions
- report job submission and tracking
- WebSocket event flow

### Sprint 6.2

- report rendering pipeline
- export storage flow
- report audit trail
- offline/reconnect handling

Exit criteria:

- an end-to-end event can be analysed, reviewed, and reported through the platform

## Phase 7: Reliability, Safety, and Compliance Hardening

Objective:
- turn a capable system into an operationally defensible one

### Sprint 7.1

- observability dashboards
- SLO instrumentation
- alerting rules
- incident-response runbook alignment

### Sprint 7.2

- privacy workflows
- retention and pseudonymisation tasks
- safety-case artefacts linkage
- audit-log separation and integrity controls

Exit criteria:

- the system is observable, auditable, and aligned with documented operational obligations

## Phase 8: Aviation Product Expansion

Objective:
- strengthen the ANSP-facing differentiation

### Sprint 8.1

- FIR intersection and aviation-context outputs
- aircraft exposure and vulnerability scoring
- uncertainty display refinements
- operator-facing airspace impact summaries
- conservative-baseline comparison outputs

### Sprint 8.2

- shadow mode behaviour
- multi-ANSP coordination foundations
- NOTAM-adjacent workflow support
- live air-traffic density and route inputs for air-risk products

Exit criteria:

- the aviation-side product layer is credible for shadow deployment and stakeholder review

## Phase 9: Space Operator Expansion

Objective:
- extend the shared core into upstream customer workflows

### Sprint 9.1

- owned-object data model and access rules
- API key lifecycle
- portal foundations

### Sprint 9.2

- controlled re-entry planner
- CCSDS OEM/CDM/RDM export
- partner-facing integration workflows

Exit criteria:

- the shared physics core now supports both downstream aviation and upstream space-operator use

## Phase 10: Deployment Readiness and Evidence

Objective:
- prepare for shadow deployment and external scrutiny

### Sprint 10.1

- validation and backcasting workflow
- named historical replay corpus and conservative-baseline comparisons
- tender-grade KPI and air-risk validation pack
- shadow reporting outputs
- deployment gating refinements

### Sprint 10.2

- final compliance artefacts
- ESA software assurance artefacts: SRS, SDD, user manual, test report
- release checklist completion
- operational readiness review
- first shadow deployment package

Exit criteria:

- the platform is ready for controlled external deployment and evidence-based review

## Cross-Cutting Workstreams

The following run continuously across phases rather than in only one sprint:

- security architecture and dependency hygiene
- documentation and ADR maintenance
- test coverage and validation artefacts
- safety-case traceability
- legal/commercial gating
- performance and capacity reviews
- procurement traceability and bid artefact maintenance

## Recommended Execution Pattern

For actual delivery, each sprint should end with:

- a demoable increment
- updated docs
- updated ADRs where needed
- passing CI
- explicit review of safety/compliance impacts

## Relationship to Other Docs

- [Overview.md](/d:/Projects/SpaceCom/docs/Overview.md) gives the shortest summary
- [Roadmap.md](/d:/Projects/SpaceCom/docs/Roadmap.md) gives the big-picture staged view
- [MASTER_PLAN.md](/d:/Projects/SpaceCom/docs/MASTER_PLAN.md) remains the authoritative detailed plan
