---
phase: 01-foundation
plan: 02
subsystem: database
tags: [sqlalchemy, sqlite, orm, models]

# Dependency graph
requires:
  - phase: 01-foundation/01-01
    provides: Python project structure with src layout
provides:
  - SQLAlchemy 2.0 models for Project, Discussion, Round, Message, Consensus
  - Base class and enums for discussion types
  - Complete relationship graph matching SPEC.md
affects: [03-project-crud, 04-single-model, 05-multi-model, 06-consensus-export]

# Tech tracking
tech-stack:
  added: []
  patterns: [sqlalchemy-2.0-declarative, uuid-as-string-36, json-for-arrays]

key-files:
  created:
    - src/moai/core/models.py
  modified: []

key-decisions:
  - "Use String(36) for UUID storage (SQLite compatibility)"
  - "Store enums as strings via str-based Enum classes"
  - "Use JSON type for models list and settings dict (no ARRAY for SQLite)"

patterns-established:
  - "SQLAlchemy 2.0 style: Mapped, mapped_column, DeclarativeBase"
  - "UUID generation via helper function _uuid()"
  - "Cascade delete-orphan on all parent-child relationships"

issues-created: []

# Metrics
duration: 3min
completed: 2026-01-16
---

# Phase 1, Plan 2: Database Models Summary

**SQLAlchemy 2.0 models with Project, Discussion, Round, Message, Consensus and bidirectional relationships**

## Performance

- **Duration:** 3 min
- **Started:** 2026-01-16T15:06:35Z
- **Completed:** 2026-01-16T15:09:42Z
- **Tasks:** 3
- **Files created:** 1

## Accomplishments
- Created complete SQLAlchemy 2.0 data model matching SPEC.md hierarchy
- Defined three enums: DiscussionType (open/discuss), DiscussionStatus (active/completed), RoundType (parallel/sequential)
- Established all bidirectional relationships with cascade delete-orphan

## Task Commits

Each task was committed atomically:

1. **Task 1: Create base model and enums** - `61da27c` (feat)
2. **Task 2+3: Create all entity models** - `a0de941` (feat)

*Note: Tasks 2 and 3 were committed together because forward references (Round, Consensus) required all models to exist for ruff linting to pass.*

**Plan metadata:** (pending)

## Files Created/Modified
- `src/moai/core/models.py` - All SQLAlchemy models, enums, and Base class

## Decisions Made
- Used String(36) for UUID storage instead of native UUID type (SQLite compatibility)
- Stored enums as strings by inheriting from both str and Enum
- Used JSON type for list/dict fields (models, settings, agreements, disagreements)
- Made Consensus.discussion_id unique (one consensus per discussion)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None - all tasks completed successfully.

## Next Phase Readiness
- Database models complete and importable
- Ready for Phase 1 Plan 3 (database.py session management) or Phase 2 (Bot Core)
- All relationships verified bidirectional

---
*Phase: 01-foundation*
*Completed: 2026-01-16*