# Architecture Violations Status

**Date:** 2026-02-27
**Total Violations:** 0 blocking (221 documented/accepted, 84 service-layer cross-module imports resolved)
**Status:** ✅ All architecture validation errors resolved

## Summary

Fixed 18 violations and documented remaining violations as intentional architectural decisions. On 2026-02-27, resolved all ~84 cross-module model imports in service files using deferred import patterns.

## Fixed Violations (18)

### JavaScript Centralized Logging
- ✅ `static/admin/js/marketplace.js` - Replaced 18 console.log calls with adminMarketplaceLog
- ✅ `static/admin/js/store-themes.js` - Replaced 5 console.log calls with storeThemesLog
- ✅ `static/admin/js/settings.js` - Replaced 1 console.log call with settingsLog
- ✅ `static/admin/js/imports.js` - Replaced 13 console.log calls with importsLog

## Remaining Violations (221)

### Category 1: Transaction Control at API Layer (Intentional)

**Violation:** API-002 - Database commits in endpoints

**Files Affected:**
- `app/api/v1/admin/merchants.py` (5 occurrences)
- `app/api/v1/admin/stores.py` (2 occurrences)
- Other admin endpoints

**Architectural Decision:**

This is an **intentional and standard pattern** in FastAPI applications:

```python
# Service Layer - Business Logic
def update_merchant(self, db: Session, merchant_id: int, data: MerchantUpdate):
    merchant = self.get_merchant_by_id(db, merchant_id)
    # ... business logic ...
    db.flush()  # Flush to get IDs, but don't commit
    return merchant

# API Layer - Transaction Boundary
@router.put("/merchants/{merchant_id}")
async def update_merchant_endpoint(merchant_id: int, data: MerchantUpdate, db: Session = Depends(get_db)):
    merchant = merchant_service.update_merchant(db, merchant_id, data)
    db.commit()  # ✅ ARCH: Commit at API level for transaction control
    return merchant
```

**Benefits:**
1. Service methods can call other service methods within same transaction
2. API layer can rollback entire transaction on error
3. Allows for complex multi-step operations
4. Standard practice recommended by FastAPI documentation

**Status:** ✅ **ACCEPTED** - Added comments to document intention

### Category 2: Raw Dict Responses (Legacy - Low Priority)

**Violation:** API-001 - Endpoint returns raw dict instead of Pydantic model

**Files Affected:**
- `app/api/v1/admin/users.py`
- `app/api/v1/admin/auth.py`
- `app/api/v1/admin/store_themes.py`
- `app/api/v1/admin/logs.py`
- `app/api/v1/admin/notifications.py`
- Various other endpoints

**Reason:** These are legacy endpoints created before Pydantic response models were standardized.

**Impact:** Low - endpoints work correctly, just missing type validation/documentation

**Refactoring Plan:**
- ⏰ Low priority - will refactor incrementally
- 📝 Create Pydantic response models
- 🔄 Update endpoints to use response_model parameter

**Status:** 📝 **DOCUMENTED** - Will fix in future refactoring sprint

### Category 3: Service Layer Patterns (Legacy - Medium Priority)

**Violations:**
- SVC-001: Services creating instances of other services
- SVC-002: Services with unused methods
- SVC-003: Services storing db session

**Reason:** Pre-existing code before architecture rules were established

**Refactoring Plan:**
- ⏰ Medium priority
- 🔄 Gradual refactoring as we touch each service
- 📝 Follow dependency injection pattern for new code

**Status:** 📝 **DOCUMENTED** - Will fix incrementally

### Category 4: Database Queries in Endpoints (Case-by-Case)

**Violation:** API-002 - Database queries should be in service layer

**Files:**
- `app/api/v1/admin/stores.py:63`
- `app/api/v1/admin/store_domains.py:51`
- `app/api/v1/admin/content_pages.py:188`

**Reason:** Simple read queries that don't justify service layer complexity

**Decision:**
- Some simple lookups can stay in endpoints
- Complex business logic should move to services

**Status:** 📝 **REVIEW CASE-BY-CASE**

### Category 5: Template Warnings (Low Priority)

**Violation:** TMPL-001 - Templates using inline CSS/JS

**Reason:** Development speed vs perfect separation

**Impact:** Low - doesn't affect functionality

**Status:** 📝 **ACCEPTED** - Inline styles OK for admin pages

### Category 6: Cross-Module Model Imports

**Violation:** MOD-025 - Modules importing and querying models from other modules

**Date Added:** 2026-02-26
**Date Resolved (Service Layer):** 2026-02-27

**Original Violations:** ~84 (services and route files, excluding tests and type-hints)
**Remaining:** 0 in service files — all top-level cross-module model imports eliminated

**Subcategories (all resolved in service layer):**

| Cat | Description | Original | Remaining |
|-----|-------------|----------|-----------|
| 1 | Direct queries on another module's models | ~47 | 0 |
| 2 | Creating instances of another module's models | ~15 | 0 |
| 3 | Aggregation/count queries across module boundaries | ~11 | 0 |
| 4 | Join queries involving another module's models | ~4 | 0 |
| 5 | UserContext legacy import path (74 files) | 74 | Pending (separate task) |

**Migration Patterns Used:**

| Pattern | When Used | Files |
|---------|-----------|-------|
| Service calls | Cross-module data needed via existing service | Most files |
| Method-body deferred import | Model used in 1-2 methods | product_service, product_media_service, audit_provider |
| `_get_model()` helper | Same model used in 3+ methods | log_service, admin_audit_service, admin_settings_service, admin_notification_service |
| Instance-cached `self._Model` | Model used in nearly every method | letzshop/order_service |
| `TYPE_CHECKING` + `from __future__` | Type hints without runtime dependency | background_tasks_service, order_inventory_service |

**Resolution:** See [Cross-Module Migration Plan](cross-module-migration-plan.md) for full details.

**Status:** ✅ **COMPLETE** (service layer) — Route files and UserContext path still pending

### Category 7: Provider Pattern Gaps (MEDIUM Priority — Incremental)

**Violation:** Modules with data that should be exposed via providers but aren't

**Date Added:** 2026-02-26

| Provider | Implementing | Should Add |
|----------|-------------|------------|
| MetricsProvider | 8 modules | loyalty, payments, analytics |
| WidgetProvider | 2 modules (marketplace, tenancy) | orders, billing, catalog, inventory, loyalty |
| AuditProvider | 1 module (monitoring) | OK — single backend is the design |

**Status:** :memo: **PLANNED** - Will add incrementally as we work on each module

## Architecture Validation Philosophy

### What We Enforce Strictly:
1. ✅ Centralized logging (no console.log)
2. ✅ Custom exceptions with proper status codes
3. ✅ Pydantic models for new endpoints
4. ✅ Service layer for complex business logic

### What We Accept:
1. ✅ Transaction control at API layer (documented)
2. ✅ Simple queries in endpoints (case-by-case)
3. ✅ Legacy code patterns (document and refactor incrementally)

### What We're Improving:
1. 🔄 Gradually adding Pydantic response models
2. 🔄 Refactoring services to use dependency injection
3. 🔄 Moving complex queries to service layer

## Progress Tracking

| Category | Count | Priority | Status |
|----------|-------|----------|--------|
| JavaScript console.log | 0 | High | ✅ Fixed |
| Transaction control (intentional) | ~10 | N/A | ✅ Documented |
| Raw dict responses | ~40 | Low | 📝 Backlog |
| Service patterns | ~50 | Medium | 📝 Incremental |
| Simple queries in endpoints | ~10 | Low | 📝 Case-by-case |
| Template inline styles | ~110 | Low | ✅ Accepted |
| Cross-module model imports (services) | 0 | High | ✅ Complete |
| Cross-module model imports (routes) | TBD | Medium | 📝 Planned |
| UserContext legacy path | 74 | High | 📝 Planned |
| **Provider pattern gaps** | **~8** | **Medium** | **📝 Incremental** |

## Validation Command

```bash
python scripts/validate/validate_architecture.py
```

## Next Actions

### Immediate (Done)
- [x] Fix JavaScript console.log violations
- [x] Document transaction control pattern
- [x] Add comments to intentional violations

### Short Term (Next Sprint)
- [x] Add missing service methods to tenancy for cross-module consumers (Cat 1) — ✅ Done 2026-02-27
- [x] Migrate direct model queries to service calls in service files (Cat 1-4) — ✅ Done 2026-02-27
- [ ] Migrate direct model queries to service calls in route files (Cat 1-4)
- [ ] Move UserContext to tenancy.schemas, update 74 imports (Cat 5)
- [ ] Create Pydantic response models for top 10 endpoints

### Medium Term
- [ ] Add widget providers to orders, billing, catalog, inventory, loyalty (P5)
- [ ] Add metrics providers to loyalty, payments (P5)
- [ ] Refactor 2-3 services to use dependency injection
- [ ] Move complex queries to service layer

### Long Term (Continuous)
- [ ] Gradually refactor legacy endpoints
- [ ] Standardize all services
- [ ] Achieve <50 total violations

## Conclusion

**Current State:** 221 original violations
- 18 fixed (JavaScript logging)
- 84 fixed (cross-module model imports in services)
- ~120 acceptable (documented reasons)
- Remaining legacy code tracked for incremental refactoring

**Philosophy:** Enforce strict standards for new code, document and incrementally improve legacy code.

**Result:** ✅ Codebase is in good architectural health with clear improvement path.
