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+# Phase 3 — Fusion Accounting Assets Implementation Plan
+
+**Module:** `fusion_accounting_assets`
+**Branch:** `fusion_accounting/phase-3-assets`
+**Pre-phase tag:** `fusion_accounting/pre-phase-3`
+**Estimated tasks:** ~50
+**Reference:** `/Users/gurpreet/Github/RePackaged-Odoo/accounting/account_asset/` (~2258 LOC Python)
+
+## Goal
+
+Replace Odoo Enterprise's `account_asset` module — asset management with depreciation schedules, disposal, partial sale, and reporting. CORE scope: 3 depreciation methods (straight-line, declining balance, units of production), full asset lifecycle, depreciation board, disposal/sale wizards. AI augmentation: utilization anomaly detection + AI-suggested useful life from invoice context. Coexists with Enterprise.
+
+## Architecture (HYBRID engine, Phase 1+2 pattern)
+
+```
+fusion.asset.engine (AbstractModel)         ← shared primitives
+├── compute_depreciation_schedule(asset, recompute=False)
+├── post_depreciation_entry(asset, period)
+├── dispose_asset(asset, *, sale_amount, sale_date, sale_partner=None)
+├── partial_sale(asset, *, sold_amount, sold_qty, sale_date)
+├── pause_asset(asset, pause_date)
+├── resume_asset(asset, resume_date)
+└── reverse_disposal(asset)
+
+services/                                    ← pure-Python
+├── depreciation_methods.py  → straight_line, declining_balance, units_of_production
+├── prorate.py               → first/last period prorating (calendar/365/etc.)
+├── salvage_value.py         → end-of-life value math
+├── anomaly_detection.py     → utilization variance vs expected
+├── useful_life_predictor.py → LLM-suggested useful life from invoice description
+└── useful_life_prompt.py    → provider-agnostic LLM prompt
+
+models/
+├── fusion_asset.py                  → main fusion.asset model
+├── fusion_asset_depreciation_line.py → depreciation board lines
+├── fusion_asset_category.py          → categories with default settings
+├── fusion_asset_disposal.py          → disposal records
+├── fusion_asset_anomaly.py           → flagged utilization issues
+├── fusion_asset_engine.py            → AbstractModel orchestrator
+└── account_move.py                   → inherit (link to asset, generate from invoice)
+
+controllers/assets_controller.py            ← 8 JSON-RPC endpoints
+├── /fusion/assets/list                      → paginated asset list with filters
+├── /fusion/assets/get_detail                → single asset with full schedule
+├── /fusion/assets/compute_schedule          → recompute depreciation board
+├── /fusion/assets/post_depreciation         → run periodic depreciation cron
+├── /fusion/assets/dispose                   → dispose an asset
+├── /fusion/assets/get_anomalies             → list flagged variances
+├── /fusion/assets/suggest_useful_life       → AI suggest useful life
+└── /fusion/assets/get_partner_history       → asset-related partner history
+
+static/src/
+├── scss/                          ← asset-specific design tokens
+├── services/assets_service.js     ← reactive state + RPC wrappers
+├── views/asset_dashboard/         ← top-level OWL controller
+└── components/                    ← asset_card, depreciation_board, disposal_dialog,
+                                     ai_useful_life_panel, anomaly_strip
+```
+
+## Coexistence
+
+`group_fusion_show_when_enterprise_absent` from `fusion_accounting_core`. Asset menu only visible when `account_asset` NOT installed. Engine + AI tools always available.
+
+## Tasks (50 total)
+
+### Group 1: Foundation (1-2)
+1. Safety net (DONE)
+2. Plan doc + module skeleton
+
+### Group 2: Pure-Python services TDD (3-7)
+3. `services/depreciation_methods.py` — straight_line + declining_balance + units_of_production (TDD)
+4. `services/prorate.py` — first/last period prorating
+5. `services/salvage_value.py` — end-of-life math
+6. `services/anomaly_detection.py` — utilization variance
+7. `services/useful_life_predictor.py` + `useful_life_prompt.py` — LLM integration
+
+### Group 3: Persisted models (8-13)
+8. `models/fusion_asset.py` — main asset model with state machine
+9. `models/fusion_asset_depreciation_line.py` — depreciation board lines
+10. `models/fusion_asset_category.py` — categories with defaults
+11. `models/fusion_asset_disposal.py` — disposal records
+12. `models/fusion_asset_anomaly.py` — flagged anomalies
+13. `models/account_move.py` (inherit) — link asset to invoice
+
+### Group 4: Engine (14-15)
+14. `models/fusion_asset_engine.py` — 7-method API
+15. Engine integration tests (compute_schedule + post_depreciation + dispose end-to-end)
+
+### Group 5: Backend wiring (16-19)
+16. JSON-RPC controller (8 endpoints)
+17. AssetsAdapter wiring `_via_fusion` paths
+18. 5 new AI tools
+19. Cron — daily depreciation post + monthly anomaly scan
+
+### Group 6: Tests + perf (20-23)
+20. Property-based tests (Hypothesis: schedule sums == cost - salvage)
+21. Integration tests — straight-line + declining-balance + units-of-production
+22. Materialized view for asset book values (perf)
+23. Performance benchmarks
+
+### Group 7: Frontend OWL (24-31)
+24. SCSS tokens + main asset stylesheet (light + dark)
+25. `assets_service.js` (reactive state + RPC wrappers)
+26. `asset_dashboard` (top-level kanban + summary)
+27. `asset_card` (one asset summary card)
+28. `asset_detail_panel` (right-side: schedule, history, AI suggestions)
+29. `depreciation_board` (table view of schedule with edit chevrons)
+30. `disposal_dialog` (sale/scrap wizard)
+31. Fusion-only: `ai_useful_life_panel` + `anomaly_strip`
+
+### Group 8: Wizards (32-35)
+32. Asset creation wizard (from invoice line)
+33. Disposal wizard (sale, scrap, donation)
+34. Partial sale wizard
+35. Period picker for depreciation runs
+
+### Group 9: Migration + coexistence (36-39)
+36. Migration wizard inheritance — backfill from account.asset rows
+37. Audit report PDF (per-company asset count, total NBV, etc.)
+38. Menu + window action with coexistence group filter
+39. Coexistence test
+
+### Group 10: Final tests + polish (40-50)
+40. 5 OWL tour tests
+41. Performance benchmarks (P95: schedule compute < 500ms, board render < 200ms)
+42. Optimize if benchmarks fail (conditional)
+43. Local LLM compat test for useful_life_predictor
+44. Update meta-module manifest
+45. CLAUDE.md, UPGRADE_NOTES.md, README.md
+46. End-to-end smoke + tag phase-3-complete + push
+47-50. Reserved for inherited features: account_move integration, draft journal entries, post-on-confirm flow, fiscal-year-aware proration
+
+## Performance Targets (P95)
+
+- `compute_schedule` (10-year asset): <500ms
+- `post_depreciation_entry`: <200ms
+- `dispose_asset`: <300ms
+- Controller `list`: <300ms
+- Controller `get_detail`: <500ms
+
+## V19 Conventions (carried from Phase 1+2)
+
+- `models.Constraint` not `_sql_constraints`
+- No `@api.depends('id')` on stored compute fields
+- `@route(type='jsonrpc')` not `type='json'`
+- `ir.cron` has no `numbercall` field
+- `res.groups.user_ids` not `users`
+- `ir.ui.menu.group_ids` not `groups_id`
+- `models.Constraint` for unique-keys
+- `env.flush_all()` before MV REFRESH
+- REFRESH MATERIALIZED VIEW CONCURRENTLY needs autocommit cursor
+
+## Test Targets
+
+Match Phase 1+2 test pyramid:
+- Unit (pure-Python services)
+- Integration (engine end-to-end)
+- Property-based (Hypothesis: schedule total invariants)
+- Controller (HttpCase JSON-RPC)
+- MV correctness
+- Performance benchmarks (tagged 'benchmark')
+- OWL tours (tagged 'tour')
+- Local LLM smoke (tagged 'local_llm')
+
+Phase 1+2 final: 287 tests. Phase 3 target: ~140-180 additional → ~430-470 total.
diff --git a/fusion_accounting_assets/__init__.py b/fusion_accounting_assets/__init__.py
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diff --git a/fusion_accounting_assets/__manifest__.py b/fusion_accounting_assets/__manifest__.py
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+{
+    'name': 'Fusion Accounting Assets',
+    'version': '19.0.1.0.0',
+    'category': 'Accounting/Accounting',
+    'summary': 'AI-augmented asset management with depreciation schedules.',
+    'description': """
+Fusion Accounting Assets
+========================
+
+A Fusion-native replacement for Odoo Enterprise's account_asset module.
+
+CORE scope (Phase 3):
+- 3 depreciation methods: straight-line, declining balance, units of production
+- Asset lifecycle: draft -> running -> paused -> disposed
+- Depreciation board with editable schedule
+- Disposal (sale, scrap, donation) + partial sale wizards
+- Daily cron for posting periodic depreciation
+
+AI augmentation:
+- Anomaly detection on utilization vs expected
+- AI-suggested useful life from invoice context (LLM)
+
+Coexists with Enterprise: when account_asset is installed, the Fusion
+menu hides; the engine + AI tools remain available for the chat.
+""",
+    'author': 'Fusion Accounting',
+    'license': 'LGPL-3',
+    'depends': [
+        'fusion_accounting_core',
+        'fusion_accounting_ai',
+        'account',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+    ],
+    'assets': {
+        'web.assets_backend': [
+        ],
+    },
+    'installable': True,
+    'auto_install': False,
+    'application': False,
+    'icon': '/fusion_accounting_assets/static/description/icon.png',
+}
diff --git a/fusion_accounting_assets/controllers/__init__.py b/fusion_accounting_assets/controllers/__init__.py
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diff --git a/fusion_accounting_assets/models/__init__.py b/fusion_accounting_assets/models/__init__.py
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diff --git a/fusion_accounting_assets/reports/__init__.py b/fusion_accounting_assets/reports/__init__.py
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diff --git a/fusion_accounting_assets/security/ir.model.access.csv b/fusion_accounting_assets/security/ir.model.access.csv
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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
diff --git a/fusion_accounting_assets/services/__init__.py b/fusion_accounting_assets/services/__init__.py
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diff --git a/fusion_accounting_assets/tests/__init__.py b/fusion_accounting_assets/tests/__init__.py
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diff --git a/fusion_accounting_assets/wizards/__init__.py b/fusion_accounting_assets/wizards/__init__.py
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