Quartz 5

AI_SESSION

6 min read

📝 AI Session Summary (2026-07-16)

Today

Conducted a complete audit of the SplitDee documentation vault, created all missing critical engineering documents, populated remaining placeholders, standardized all cross-document links, and completed a comprehensive Domain Modeling and Business Rules Specification to prepare the project for an Architecture Freeze.

What was completed?

  1. Critical Missing Engineering Documentation Created:
    • 03_System/Security_Policy.md: Detailing CORS setup, JWT encryption/rotation, rate limiting, and slip verification double-spend checks.
    • 06_Testing/Testing_Strategy.md: Defining unit and integration testing workflows, database transaction rollback patterns in FastAPI, and widget/E2E testing in Flutter.
    • 05_Development/Deployment_Guide.md: Detailing Docker Compose setups, Alembic production migration protocols, SSL auto-renewal, and encrypted offsite backup strategies.
  2. Product Playbook Expansion:
    • Populated the blank placeholder CTO_PLAYBOOK/09_Product_Review_Checklist.md with a complete product fit, UX, AI support, and feature-creep verification checklist.
  3. Repository Conventions & Quality Control:
    • Created 05_Development/Coding_Standards.md defining code styles (PEP 8 for FastAPI, official guidelines for Flutter), Git branching strategy, and Conventional Commits.
    • Created 00_Project/Project_Management.md including the Risk Register, Technical Debt Log, Assumptions, and Constraints.
  4. Domain Modeling & Business Rules Specifications:
    • Created DOMAIN_MODEL.md defining attributes, validation rules, lifecycles, and constraints for all 14 core entities.
    • Created BUSINESS_RULES.md specifying clearing algorithms, limits, locks, pet calculations, and AI tone selectors.
    • Created STATE_MACHINES.md with Mermaid state diagrams and recovery paths.
    • Created DOMAIN_EVENTS.md cataloging triggers, sources, consumers, and expected outcomes.
    • Created PERMISSION_MATRIX.md specifying Role-Based Access Controls (RBAC).
    • Created NOTIFICATION_STRATEGY.md detailing dispatch logic and backoffs.
    • Created ERROR_HANDLING.md mapping timeouts, offline sync, and race condition resolutions.
    • Created AI_ARCHITECTURE.md defining OCR pipelines, prompt instructions, and LLM providers.
  5. Knowledge Organization & Graph Indexing:
    • Updated INDEX.md and Dashboard.md to catalog and link the new domain modeling documents.
    • Standardized and updated legacy relative links across all files in the 01_Product subfolder and Dashboard.md.
    • Created 00_Project/GLOSSARY.md defining 71 core project terms across 9 categories to establish a ubiquitous vocabulary.
    • Created PROJECT_STATUS.md defining the current development status, frozen status gates, and sprint objectives.
  6. Session Reports & Approvals:
    • Generated today’s reports/2026-07-16-document-audit.md, reports/2026-07-16-health-report.md, and reports/2026-07-16-session-summary.md.
    • Generated ARCHITECTURE_FREEZE_REPORT.md formally approving the transition to the Development Phase.

What decisions were made?

  • Unified Indexing: Added INDEX.md and SYSTEM_MAP.md to establish a central entry point for future developers and AI agents.
  • Link Standard Compliance: Replaced all legacy bracket link formats with absolute folder/relative path Obsidian-compliant references.
  • Strict Domain Separation: Separated AI models, business rules, and state machines into individual, cohesive documents in the vault to support automated code generation.

What remains?

  • Configure PostgreSQL database connectivity and run initial Alembic migrations.
  • Set up Docker Compose local development environment for multi-container services.
  • Develop Flutter Auth screens (Login/Signup wireframes) with Riverpod integration.

Session Update (Bilingual Transition & Sprint 1 Implementation)

  • Bilingual Transition: Restructured all 18 specification and management documents in the vault to be fully bilingual (Thai-English) with separated sections (## 🇹🇭 ภาษาไทย (สำหรับผู้ใช้งาน) and ## 🇬🇧 English (For AI Agents)) following the formatting style of README.md.
  • Sprint 1 (Authentication) Implementation:
    • Defined abstract domain interfaces PasswordHasher and TokenGenerator.
    • Refactored RegisterUserUseCase and LoginUserUseCase to depend on these domain interfaces, resolving Clean Architecture violations.
    • Implemented concrete BcryptPasswordHasher and JWTTokenGenerator classes in the infrastructure layer.
    • Reduced access token lifespan to 15 minutes as per Security_Policy.md.
    • Updated use case and API integration test suites (test_auth_logic.py and test_auth_api.py) to inject dependencies.
    • Verified all tests pass successfully.

Session Update 2 (PostgreSQL Connection, Alembic Migrations & Dockerization Setup)

  • Alembic Database Migrations:
    • Initialized Alembic database migration directory (backend/alembic) and configuration (backend/alembic.ini).
    • Configured backend/alembic/env.py to append the project root path, import project models (Base), and dynamically load the database connection URL (DATABASE_URL) from the environment, ensuring seamless offline and online migrations.
    • Successfully generated the initial database migration revision (fff1fbce412e_initial_schema.py) targeting all 8 project models (users, groups, group_members, bills, expense_shares, payments, chats, and group_pets).
  • Dockerization Setup:
    • Created backend/Dockerfile with a multi-stage build optimizing dependencies and configuring PYTHONPATH to support module imports correctly.
    • Created docker/nginx.conf reverse proxy configuration routing HTTP/WS traffic to the backend, enabling WebSocket support for real-time group chat.
    • Created the root docker-compose.yml file orchestrating the multi-container stack (splitdee-backend, splitdee-db, splitdee-redis, splitdee-nginx), matching the specifications defined in Deployment_Guide.md and SYSTEM_MAP.md.
  • Progress Tracking & Verification:
    • Updated TASK_LOG.md and CONTEXT.md to reflect the completed milestones.
    • Verified and confirmed all integration and use case tests run and pass successfully.

Session Update 3 (Group Management Implementation)

  • Domain Layer Setup:
  • Use Case Logic:
    • Implemented CreateGroupUseCase: Handles unique 10-character invite code generation, group entity persistence, adding the creator as group owner, and hatching the group pet Mochi (level 1, hp=100, happiness=100).
    • Implemented JoinGroupUseCase: Validates invite codes, enforces member limit of 50 (BR-GRP-001), prevents joining twice, registers membership, and increases group pet happiness by 5 (capped at 100).
    • Implemented ListUserGroupsUseCase: Queries all groups associated with the active user.
  • Infrastructure Layer:
  • Presentation & API Routing:
    • Designed schemas in group.py with request models and envelope responses.
    • Built router endpoints in group.py utilizing standard JSONResponses for custom error payload specifications.
    • Registered router in FastAPI application instance main.py.
  • Testing & Verification:
    • Created test_group_api.py containing comprehensive integration tests for group creation, invite code checks, member limit constraints, double-membership restrictions, and pet initialization. All tests pass successfully.
    • Updated PROJECT_STATUS.md to mark Sprint 1 (Authentication) and Sprint 2 (Group Management) as completed.

Session Update 4 (Status Alignment & UI Redesign Planning - 2026-07-19)

  • Synchronized Obsidian Progress Docs:
    • Synced ROADMAP.md to mark Phase 3: “Group Management” and Phase 5: “Mochi Status Management” as completed ([x]).
    • Updated TASK_LOG.md to move “Group Management” to completed tasks, and defined current active work as “UI Screens Redesign Planning”.
    • Overwrote Next_Sprint.md to officially transition to Sprint 3: Expenses, Splits, and PromptPay (focusing on split logic, Dynamic PromptPay QR generation, and slip verification structures).
    • Updated Implementation_Status.md ledger to categorize and classify all files related to the Group, Bill, Chat, and Pet modules.
  • UI Screen Structure Mapping:
    • Analyzed the current Flutter screens (LoginPage, DashboardPage, GroupDetailPage with tabs for Bills, Pet, and Chat).
    • Defined the revised 9-screen UI structure required to support all planned features (including custom split configurators, PromptPay view, AI reminder dialogs, Mochi cosmetics shop, and analytics reports).

Any risks?

  • R-COST-002 (Operational Cost): Mini-QR slip verification requests to bank partner APIs generate costs per lookup, addressed by setting request thresholds.
  • R-GAM-004 (Excessive HP Penalty): Gamification pet health decline could annoy users, addressed by adding grace periods and vacation modes.

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