docs(05-01): complete discussion service plan

Tasks completed: 2/2
- Create discussion service with CRUD operations
- Add round and message operations

SUMMARY: .planning/phases/05-multi-model-discussions/05-01-SUMMARY.md

.planning/ROADMAP.md

@@ -57,7 +57,7 @@ None
 **Goal**: Open mode (parallel), discuss mode (sequential rounds), and @mention direct messages
 **Depends on**: Phase 4
 **Research**: Unlikely (builds on Phase 4 AI client patterns)
-**Plans**: TBD
+**Plans**: 4 (05-01 discussion service, 05-02 open mode, 05-03 discuss mode, 05-04 mentions)
 
 ### Phase 6: Consensus & Export
 **Goal**: Consensus generation from discussions and markdown export
@@ -76,5 +76,5 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6
 | 2. Bot Core | 2/2 | Complete | 2026-01-16 |
 | 3. Project CRUD | 3/3 | Complete | 2026-01-16 |
 | 4. Single Model Q&A | 2/2 | Complete | 2026-01-16 |
-| 5. Multi-Model Discussions | 0/TBD | Not started | - |
+| 5. Multi-Model Discussions | 1/4 | In progress | - |
 | 6. Consensus & Export | 0/TBD | Not started | - |

.planning/STATE.md

@@ -9,17 +9,17 @@ See: .planning/PROJECT.md (updated 2026-01-16)
 
 ## Current Position
 
-Phase: 4 of 6 (Single Model Q&A) - COMPLETE
-Plan: 2 of 2 in phase 4 (completed)
-Status: Ready for Phase 5
-Last activity: 2026-01-16 — Completed 04-02-PLAN.md (/ask command handler)
+Phase: 5 of 6 (Multi-Model Discussions)
+Plan: 1 of 4 in current phase
+Status: In progress
+Last activity: 2026-01-16 — Completed 05-01-PLAN.md (discussion service)
 
-Progress: ██████▓░░░ ~65%
+Progress: ███████░░░ ~70%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 10
+- Total plans completed: 11
 - Average duration: 4 min
 - Total execution time: 0.7 hours
 
@@ -31,9 +31,10 @@ Progress: ██████▓░░░ ~65%
 | 02-bot-core | 2 | 4 min | 2 min |
 | 03-project-crud | 3 | 11 min | 4 min |
 | 04-single-model-qa | 2 | 10 min | 5 min |
+| 05-multi-model | 1 | 2 min | 2 min |
 
 **Recent Trend:**
-- Last 5 plans: 03-02 (3 min), 03-03 (5 min), 04-01 (5 min), 04-02 (5 min)
+- Last 5 plans: 03-03 (5 min), 04-01 (5 min), 04-02 (5 min), 05-01 (2 min)
 - Trend: Fast
 
 ## Accumulated Context
@@ -74,6 +75,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-01-16T19:15:00Z
-Stopped at: Completed 04-02-PLAN.md (/ask command handler) - Phase 4 complete
+Last session: 2026-01-16T19:26:56Z
+Stopped at: Completed 05-01-PLAN.md (discussion service)
 Resume file: None

.planning/phases/05-multi-model-discussions/05-01-SUMMARY.md

@@ -0,0 +1,96 @@
+---
+phase: 05-multi-model-discussions
+plan: 01
+subsystem: api
+tags: [sqlalchemy, async, services, crud]
+
+# Dependency graph
+requires:
+  - phase: 04-single-model-qa
+    provides: AI client abstraction
+  - phase: 01-foundation
+    provides: SQLAlchemy models
+provides:
+  - Discussion CRUD operations (create, get, list, complete)
+  - Round management (create, get current)
+  - Message management (create, list)
+affects: [05-02 open mode, 05-03 discuss mode, 05-04 mentions, 06-consensus]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [selectinload for eager loading, async context manager for sessions]
+
+key-files:
+  created: [src/moai/core/services/discussion.py]
+  modified: [src/moai/core/services/__init__.py]
+
+key-decisions:
+  - "selectinload for rounds→messages to prevent N+1 queries"
+  - "Eager load consensus relationship in get_discussion"
+
+patterns-established:
+  - "Discussion service pattern matching project.py"
+  - "get_current_round returns highest round_number"
+
+issues-created: []
+
+# Metrics
+duration: 2min
+completed: 2026-01-16
+---
+
+# Phase 5 Plan 1: Discussion Service Summary
+
+**Discussion service with 9 async CRUD operations for discussions, rounds, and messages using selectinload eager loading**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-01-16T19:24:14Z
+- **Completed:** 2026-01-16T19:26:56Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+
+- Created discussion service following established service layer pattern
+- Implemented 5 discussion operations: create, get (with eager loading), get_active, list, complete
+- Added 4 round/message operations: create_round, get_current_round, create_message, get_round_messages
+- Used selectinload for eager loading rounds→messages to avoid N+1 queries
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create discussion service with CRUD operations** - `3258c3a` (feat)
+2. **Task 2: Add round and message operations** - `baf02bb` (feat)
+
+## Files Created/Modified
+
+- `src/moai/core/services/discussion.py` - Discussion, Round, Message CRUD operations (9 async functions)
+- `src/moai/core/services/__init__.py` - Updated exports
+
+## Decisions Made
+
+- Used selectinload for eager loading rounds→messages→consensus to prevent N+1 queries
+- get_discussion includes consensus in eager loading for future phase 6
+- get_current_round orders by round_number desc with limit 1 for efficiency
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None
+
+## Next Phase Readiness
+
+- Discussion service ready for /open and /discuss command handlers
+- Round/message operations available for multi-model discussion flow
+- Ready for 05-02-PLAN.md (open mode handler)
+
+---
+*Phase: 05-multi-model-discussions*
+*Completed: 2026-01-16*