Implementation Plan: Inactive Sessions Purging, Form Data Persistence, and Centralized Snackbars

Branch: 009-inactive-sessions-purging | Date: четверг, 16 октября 2025 г. | Spec: D:\Coding\unisono\specs\009-inactive-sessions-purging\spec.md Input: Feature specification from /specs/009-inactive-sessions-purging/spec.md

Note: This template is filled in by the /speckit.plan command. See .specify/templates/commands/plan.md for the execution workflow.

Summary

This feature implements automatic purging of inactive user sessions, real-time persistence of unsubmitted form input values using WebSockets, and consistent display of snackbar notifications in the top right corner of the UI.

Technical Context

Language/Version: TypeScript 5.x, Node.js (LTS) Primary Dependencies: React, Material-UI / MUI, WebSocket library Storage: Ephemeral server-side session storage (in-memory/session store) Testing: Jest, React Testing Library Target Platform: Web (browser for frontend, Node.js server for backend) Project Type: Web application (frontend + backend) Performance Goals: Maintain performance and stability for up to 100 concurrent active user sessions Constraints: Session inactivity timeout configurable via environment variable Scale/Scope: Up to 100 concurrent active user sessions

Constitution Check

GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.

I. Defined Technology Stack: PASS

Backend: Node.js - PASS
Frontend: React - PASS
UI Framework: Material Design 3 (Material-UI / MUI) - PASS
Containerization: Docker - PASS

II. UI/UX Consistency: PASS

All user interfaces MUST adhere to Material Design 3 principles and components. - PASS

III. Container-First Development: PASS

All application services and development environments MUST run within Docker containers. - PASS

IV. Test-Driven Development (TDD): PASS

New features and bug fixes MUST follow a Test-Driven Development approach. - PASS

V. API-First Design: PASS

The backend and frontend are decoupled and communicate via a well-defined API contract. - PASS

Project Structure

Documentation (this feature)

specs/[###-feature]/
├── plan.md              # This file (/speckit.plan command output)
├── research.md          # Phase 0 output (/speckit.plan command)
├── data-model.md        # Phase 1 output (/speckit.plan command)
├── quickstart.md        # Phase 1 output (/speckit.plan command)
├── contracts/           # Phase 1 output (/speckit.plan command)
└── tasks.md             # Phase 2 output (/speckit.tasks command - NOT created by /speckit.plan)

Source Code (repository root)

# [REMOVE IF UNUSED] Option 1: Single project (DEFAULT)
src/
├── models/
├── services/
├── cli/
└── lib/

tests/
├── contract/
├── integration/
├── unit/

# [REMOVE IF UNUSED] Option 2: Web application (when "frontend" + "backend" detected)
backend/
├── src/
│   ├── models/
│   ├── services/
│   └── api/
└── tests/

frontend/
├── src/
│   ├── components/
│   ├── pages/
│   └── services/
└── tests/

# [REMOVE IF UNUSED] Option 3: Mobile + API (when "iOS/Android" detected)
api/
└── [same as backend above]

ios/ or android/
└── [platform-specific structure: feature modules, UI flows, platform tests]

Structure Decision: [Document the selected structure and reference the real directories captured above]

Complexity Tracking

Fill ONLY if Constitution Check has violations that must be justified

Violation	Why Needed	Simpler Alternative Rejected Because
[e.g., 4th project]	[current need]	[why 3 projects insufficient]
[e.g., Repository pattern]	[specific problem]	[why direct DB access insufficient]

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