diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
index ec6cc46..91c0cd1 100644
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@@ -68,7 +68,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
-| 1. Foundation | 1/TBD | In progress | - |
+| 1. Foundation | 2/TBD | In progress | - |
 | 2. Bot Core | 0/TBD | Not started | - |
 | 3. Project CRUD | 0/TBD | Not started | - |
 | 4. Single Model Q&A | 0/TBD | Not started | - |
diff --git a/.planning/STATE.md b/.planning/STATE.md
index 90d707a..d3c05ac 100644
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@@ -10,28 +10,28 @@ See: .planning/PROJECT.md (updated 2026-01-16)
 ## Current Position
 
 Phase: 1 of 6 (Foundation)
-Plan: 1 of TBD complete
+Plan: 2 of TBD complete
 Status: In progress
-Last activity: 2026-01-16 — Completed 01-01-PLAN.md (project scaffolding)
+Last activity: 2026-01-16 — Completed 01-02-PLAN.md (database models)
 
-Progress: █░░░░░░░░░ ~10%
+Progress: ██░░░░░░░░ ~15%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 1
-- Average duration: 8 min
-- Total execution time: 0.13 hours
+- Total plans completed: 2
+- Average duration: 5.5 min
+- Total execution time: 0.18 hours
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| 01-foundation | 1 | 8 min | 8 min |
+| 01-foundation | 2 | 11 min | 5.5 min |
 
 **Recent Trend:**
-- Last 5 plans: 01-01 (8 min)
-- Trend: Starting
+- Last 5 plans: 01-01 (8 min), 01-02 (3 min)
+- Trend: Fast
 
 ## Accumulated Context
 
@@ -42,6 +42,8 @@ Recent decisions affecting current work:
 
 - **01-01:** hatchling as build backend with explicit src layout config
 - **01-01:** ruff-pre-commit v0.14.13 with --fix for auto-corrections
+- **01-02:** String(36) for UUID storage (SQLite compatibility)
+- **01-02:** JSON type for list/dict fields (no ARRAY for SQLite)
 
 ### Deferred Issues
 
@@ -53,6 +55,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-01-16
-Stopped at: Project initialization complete
+Last session: 2026-01-16T15:09:42Z
+Stopped at: Completed 01-02-PLAN.md (database models)
 Resume file: None
diff --git a/.planning/phases/01-foundation/01-02-SUMMARY.md b/.planning/phases/01-foundation/01-02-SUMMARY.md
new file mode 100644
index 0000000..4d06ccb
--- /dev/null
+++ b/.planning/phases/01-foundation/01-02-SUMMARY.md
@@ -0,0 +1,95 @@
+---
+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*