diff --git a/app/modules/analytics/routes/pages/store.py b/app/modules/analytics/routes/pages/store.py
index 2f7f5ddb..81126baf 100644
--- a/app/modules/analytics/routes/pages/store.py
+++ b/app/modules/analytics/routes/pages/store.py
@@ -13,7 +13,7 @@ from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_store_from_cookie_or_header, get_db
 from app.modules.core.services.platform_settings_service import (
-    platform_settings_service,  # MOD-004 - shared platform service
+    platform_settings_service,  # noqa: MOD-004 - shared platform service
 )
 from app.modules.tenancy.models import Store, User
 from app.templates_config import templates
diff --git a/app/modules/checkout/routes/api/storefront.py b/app/modules/checkout/routes/api/storefront.py
index 1c8fe66e..8138c340 100644
--- a/app/modules/checkout/routes/api/storefront.py
+++ b/app/modules/checkout/routes/api/storefront.py
@@ -27,7 +27,7 @@ from app.modules.checkout.schemas import (
 from app.modules.checkout.services import checkout_service
 from app.modules.customers.schemas import CustomerContext
 from app.modules.messaging.services.email_service import (
-    EmailService,  # MOD-004 - Core email service
+    EmailService,  # noqa: MOD-004 - Core email service
 )
 from app.modules.orders.schemas import OrderCreate, OrderResponse
 from app.modules.orders.services import order_service
diff --git a/app/modules/cms/routes/api/store_content_pages.py b/app/modules/cms/routes/api/store_content_pages.py
index f6245725..802cd8b1 100644
--- a/app/modules/cms/routes/api/store_content_pages.py
+++ b/app/modules/cms/routes/api/store_content_pages.py
@@ -27,7 +27,7 @@ from app.modules.cms.schemas import (
 from app.modules.cms.services import content_page_service
 from app.modules.tenancy.models import User
 from app.modules.tenancy.services.store_service import (
-    StoreService,  # MOD-004 - shared platform service
+    StoreService,  # noqa: MOD-004 - shared platform service
 )
 
 store_service = StoreService()
diff --git a/app/modules/cms/routes/pages/store.py b/app/modules/cms/routes/pages/store.py
index ae62be51..d27a3b50 100644
--- a/app/modules/cms/routes/pages/store.py
+++ b/app/modules/cms/routes/pages/store.py
@@ -14,7 +14,7 @@ from sqlalchemy.orm import Session
 from app.api.deps import get_current_store_from_cookie_or_header, get_db
 from app.modules.cms.services import content_page_service
 from app.modules.core.services.platform_settings_service import (
-    platform_settings_service,  # MOD-004 - shared platform service
+    platform_settings_service,  # noqa: MOD-004 - shared platform service
 )
 from app.modules.tenancy.models import Store, User
 from app.templates_config import templates
diff --git a/app/modules/core/routes/api/admin_menu_config.py b/app/modules/core/routes/api/admin_menu_config.py
index 28c4d24a..725e2313 100644
--- a/app/modules/core/routes/api/admin_menu_config.py
+++ b/app/modules/core/routes/api/admin_menu_config.py
@@ -28,7 +28,7 @@ from app.api.deps import (
     get_db,
 )
 from app.modules.core.services.menu_service import MenuItemConfig, menu_service
-from app.modules.enums import FrontendType  # API-007 - Enum for type safety
+from app.modules.enums import FrontendType  # noqa: API-007 - Enum for type safety
 from app.modules.tenancy.services.platform_service import platform_service
 from app.utils.i18n import DEFAULT_LANGUAGE, translate
 from models.schema.auth import UserContext
diff --git a/app/modules/core/services/auth_service.py b/app/modules/core/services/auth_service.py
index b2dfeec1..11adf758 100644
--- a/app/modules/core/services/auth_service.py
+++ b/app/modules/core/services/auth_service.py
@@ -61,7 +61,7 @@ class AuthService:
 
         # Update last_login timestamp
         user.last_login = datetime.now(UTC)
-        db.commit()  # SVC-006 - Login must persist last_login timestamp
+        db.commit()  # noqa: SVC-006 - Login must persist last_login timestamp
 
         token_data = self.auth_manager.create_access_token(user)
 
@@ -176,7 +176,7 @@ class AuthService:
 
         # Update last_login timestamp
         user.last_login = datetime.now(UTC)
-        db.commit()  # SVC-006 - Login must persist last_login timestamp
+        db.commit()  # noqa: SVC-006 - Login must persist last_login timestamp
 
         token_data = self.auth_manager.create_access_token(user)
 
diff --git a/app/modules/core/services/platform_settings_service.py b/app/modules/core/services/platform_settings_service.py
index f4e03143..dc9fec88 100644
--- a/app/modules/core/services/platform_settings_service.py
+++ b/app/modules/core/services/platform_settings_service.py
@@ -133,7 +133,7 @@ class PlatformSettingsService:
             )
             db.add(admin_setting)
 
-        db.commit()  # SVC-006 - Setting change is atomic, commit is intentional
+        db.commit()  # noqa: SVC-006 - Setting change is atomic, commit is intentional
         db.refresh(admin_setting)
 
         logger.info(f"Platform setting '{key}' set to '{value}' by user {user_id}")
diff --git a/app/modules/customers/routes/api/storefront.py b/app/modules/customers/routes/api/storefront.py
index efff4e03..de43854d 100644
--- a/app/modules/customers/routes/api/storefront.py
+++ b/app/modules/customers/routes/api/storefront.py
@@ -25,7 +25,7 @@ from app.core.database import get_db
 from app.core.environment import should_use_secure_cookies
 from app.exceptions import ValidationException
 from app.modules.core.services.auth_service import (
-    AuthService,  # MOD-004 - Core auth service
+    AuthService,  # noqa: MOD-004 - Core auth service
 )
 from app.modules.customers.models import PasswordResetToken
 from app.modules.customers.schemas import (
@@ -44,7 +44,7 @@ from app.modules.customers.services import (
     customer_service,
 )
 from app.modules.messaging.services.email_service import (
-    EmailService,  # MOD-004 - Core email service
+    EmailService,  # noqa: MOD-004 - Core email service
 )
 from app.modules.tenancy.exceptions import StoreNotFoundException
 from models.schema.auth import (
diff --git a/app/modules/inventory/services/inventory_service.py b/app/modules/inventory/services/inventory_service.py
index 957c9153..2366392b 100644
--- a/app/modules/inventory/services/inventory_service.py
+++ b/app/modules/inventory/services/inventory_service.py
@@ -754,7 +754,7 @@ class InventoryService:
         self, db: Session
     ) -> AdminStoresWithInventoryResponse:
         """Get list of stores that have inventory entries (admin only)."""
-        # SVC-005 - Admin function, intentionally cross-store
+        # noqa: SVC-005 - Admin function, intentionally cross-store
         # Use subquery to avoid DISTINCT on JSON columns (PostgreSQL can't compare JSON)
         store_ids_subquery = (
             db.query(Inventory.store_id)
diff --git a/app/modules/marketplace/schemas/marketplace_import_job.py b/app/modules/marketplace/schemas/marketplace_import_job.py
index 966ab8b2..a1d43874 100644
--- a/app/modules/marketplace/schemas/marketplace_import_job.py
+++ b/app/modules/marketplace/schemas/marketplace_import_job.py
@@ -25,8 +25,8 @@ class MarketplaceImportJobRequest(BaseModel):
     @field_validator("source_url")
     @classmethod
     def validate_url(cls, v):
-        if not v.startswith(("http://", "https://")):  # SEC-034
-            raise ValueError("URL must start with http:// or https://")  # SEC-034
+        if not v.startswith(("http://", "https://")):  # noqa: SEC-034
+            raise ValueError("URL must start with http:// or https://")  # noqa: SEC-034
         return v.strip()
 
     @field_validator("marketplace")
@@ -64,8 +64,8 @@ class AdminMarketplaceImportJobRequest(BaseModel):
     @field_validator("source_url")
     @classmethod
     def validate_url(cls, v):
-        if not v.startswith(("http://", "https://")):  # SEC-034
-            raise ValueError("URL must start with http:// or https://")  # SEC-034
+        if not v.startswith(("http://", "https://")):  # noqa: SEC-034
+            raise ValueError("URL must start with http:// or https://")  # noqa: SEC-034
         return v.strip()
 
     @field_validator("marketplace")
diff --git a/app/modules/marketplace/services/letzshop/order_service.py b/app/modules/marketplace/services/letzshop/order_service.py
index d5caa243..19c57c5c 100644
--- a/app/modules/marketplace/services/letzshop/order_service.py
+++ b/app/modules/marketplace/services/letzshop/order_service.py
@@ -865,7 +865,7 @@ class LetzshopOrderService:
                             pass
 
                 if needs_update:
-                    self.db.commit()  # SVC-006 - background task needs incremental commits
+                    self.db.commit()  # noqa: SVC-006 - background task needs incremental commits
                     stats["updated"] += 1
                 else:
                     stats["skipped"] += 1
@@ -881,7 +881,7 @@ class LetzshopOrderService:
                 # Create new order using unified service
                 try:
                     self.create_order(store_id, shipment)
-                    self.db.commit()  # SVC-006 - background task needs incremental commits
+                    self.db.commit()  # noqa: SVC-006 - background task needs incremental commits
                     stats["imported"] += 1
 
                     # Decrement remaining count for batch efficiency
@@ -1093,7 +1093,7 @@ class LetzshopOrderService:
             status="pending",
         )
         self.db.add(job)
-        self.db.commit()  # SVC-006 - job must be visible immediately before background task starts
+        self.db.commit()  # noqa: SVC-006 - job must be visible immediately before background task starts
         self.db.refresh(job)
         return job
 
@@ -1134,6 +1134,6 @@ class LetzshopOrderService:
         )
         if job:
             job.celery_task_id = celery_task_id
-            self.db.commit()  # SVC-006 - Called from API endpoint
+            self.db.commit()  # noqa: SVC-006 - Called from API endpoint
             return True
         return False
diff --git a/app/modules/marketplace/services/letzshop/store_sync_service.py b/app/modules/marketplace/services/letzshop/store_sync_service.py
index 328b35ae..8e5a064f 100644
--- a/app/modules/marketplace/services/letzshop/store_sync_service.py
+++ b/app/modules/marketplace/services/letzshop/store_sync_service.py
@@ -498,7 +498,7 @@ class LetzshopStoreSyncService:
         # Create store
         store = admin_service.create_store(self.db, store_data)
 
-        # Mark the Letzshop store as claimed (commits internally)  # SVC-006
+        # Mark the Letzshop store as claimed (commits internally)  # noqa: SVC-006
         self.mark_store_claimed(letzshop_slug, store.id)
 
         logger.info(
diff --git a/app/modules/marketplace/services/marketplace_product_service.py b/app/modules/marketplace/services/marketplace_product_service.py
index fceafa8a..cc315f9d 100644
--- a/app/modules/marketplace/services/marketplace_product_service.py
+++ b/app/modules/marketplace/services/marketplace_product_service.py
@@ -446,7 +446,7 @@ class MarketplaceProductService:
             InventorySummaryResponse if inventory found, None otherwise
         """
         try:
-            # SVC-005 - Admin/internal function for inventory lookup by GTIN
+            # noqa: SVC-005 - Admin/internal function for inventory lookup by GTIN
             inventory_entries = db.query(Inventory).filter(Inventory.gtin == gtin).all()
             if not inventory_entries:
                 return None
diff --git a/app/modules/marketplace/services/platform_signup_service.py b/app/modules/marketplace/services/platform_signup_service.py
index 7e8908e5..f3ca3045 100644
--- a/app/modules/marketplace/services/platform_signup_service.py
+++ b/app/modules/marketplace/services/platform_signup_service.py
@@ -415,7 +415,7 @@ class PlatformSignupService:
         )
         subscription.stripe_customer_id = stripe_customer_id
 
-        db.commit()  # SVC-006 - Atomic account creation needs commit
+        db.commit()  # noqa: SVC-006 - Atomic account creation needs commit
 
         # Update session
         self.update_session(session_id, {
@@ -603,7 +603,7 @@ class PlatformSignupService:
         if subscription:
             subscription.card_collected_at = datetime.now(UTC)
             subscription.stripe_payment_method_id = payment_method_id
-            db.commit()  # SVC-006 - Finalize signup needs commit
+            db.commit()  # noqa: SVC-006 - Finalize signup needs commit
 
         # Get store info
         store = db.query(Store).filter(Store.id == store_id).first()
diff --git a/app/modules/messaging/services/email_service.py b/app/modules/messaging/services/email_service.py
index 4b06ea44..4d387fcc 100644
--- a/app/modules/messaging/services/email_service.py
+++ b/app/modules/messaging/services/email_service.py
@@ -1336,7 +1336,7 @@ class EmailService:
                 related_id=related_id,
             )
             self.db.add(log)
-            self.db.commit()  # SVC-006 - Email logs are side effects, commit immediately
+            self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
             return log
 
         # Inject branding variables if requested
@@ -1471,7 +1471,7 @@ class EmailService:
         if not email_enabled:
             log.status = EmailStatus.FAILED.value
             log.error_message = "Email sending is disabled"
-            self.db.commit()  # SVC-006 - Email logs are side effects, commit immediately
+            self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
             logger.info(f"Email sending disabled, skipping: {to_email}")
             return log
 
@@ -1497,7 +1497,7 @@ class EmailService:
             log.mark_failed(error or "Unknown error")
             logger.error(f"Email failed to {to_email}: {error}")
 
-        self.db.commit()  # SVC-006 - Email logs are side effects, commit immediately
+        self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
         return log
 
 
diff --git a/app/modules/monitoring/services/background_tasks_service.py b/app/modules/monitoring/services/background_tasks_service.py
index 518c4f94..abbb0e8d 100644
--- a/app/modules/monitoring/services/background_tasks_service.py
+++ b/app/modules/monitoring/services/background_tasks_service.py
@@ -44,7 +44,7 @@ class BackgroundTasksService:
 
     def get_running_test_runs(self, db: Session) -> list[TestRun]:
         """Get currently running test runs"""
-        # SVC-005 - Platform-level, TestRuns not store-scoped
+        # noqa: SVC-005 - Platform-level, TestRuns not store-scoped
         return db.query(TestRun).filter(TestRun.status == "running").all()
 
     def get_import_stats(self, db: Session) -> dict:
diff --git a/app/modules/orders/routes/api/storefront.py b/app/modules/orders/routes/api/storefront.py
index 1ad26f07..8e174cb7 100644
--- a/app/modules/orders/routes/api/storefront.py
+++ b/app/modules/orders/routes/api/storefront.py
@@ -32,7 +32,7 @@ from app.modules.orders.schemas import (
 )
 from app.modules.orders.services import order_service
 from app.modules.orders.services.invoice_service import (
-    invoice_service,  # MOD-004 - Core invoice service
+    invoice_service,  # noqa: MOD-004 - Core invoice service
 )
 from app.modules.tenancy.exceptions import StoreNotFoundException
 
diff --git a/app/modules/orders/services/order_service.py b/app/modules/orders/services/order_service.py
index d72d62bf..75d52f6e 100644
--- a/app/modules/orders/services/order_service.py
+++ b/app/modules/orders/services/order_service.py
@@ -1292,7 +1292,7 @@ class OrderService:
     ) -> dict[str, Any]:
         """Get shipping label information for an order (admin only)."""
         from app.modules.core.services.admin_settings_service import (
-            admin_settings_service,  # MOD-004
+            admin_settings_service,  # noqa: MOD-004
         )
 
         order = db.query(Order).filter(Order.id == order_id).first()
diff --git a/app/modules/tenancy/models/merchant_domain.py b/app/modules/tenancy/models/merchant_domain.py
index 62603714..9e6814e4 100644
--- a/app/modules/tenancy/models/merchant_domain.py
+++ b/app/modules/tenancy/models/merchant_domain.py
@@ -103,7 +103,7 @@ class MerchantDomain(Base, TimestampMixin):
         - EXAMPLE.COM -> example.com
         """
         # Remove protocol
-        domain = domain.replace("https://", "").replace("http://", "")  # SEC-034
+        domain = domain.replace("https://", "").replace("http://", "")  # noqa: SEC-034
 
         # Remove trailing slash
         domain = domain.rstrip("/")
diff --git a/app/modules/tenancy/models/store_domain.py b/app/modules/tenancy/models/store_domain.py
index 4f024638..40fd1c73 100644
--- a/app/modules/tenancy/models/store_domain.py
+++ b/app/modules/tenancy/models/store_domain.py
@@ -92,7 +92,7 @@ class StoreDomain(Base, TimestampMixin):
         - EXAMPLE.COM -> example.com
         """
         # Remove protocol
-        domain = domain.replace("https://", "").replace("http://", "")  # SEC-034
+        domain = domain.replace("https://", "").replace("http://", "")  # noqa: SEC-034
 
         # Remove trailing slash
         domain = domain.rstrip("/")
diff --git a/app/modules/tenancy/routes/api/admin_modules.py b/app/modules/tenancy/routes/api/admin_modules.py
index c942b79e..4f7a5b4e 100644
--- a/app/modules/tenancy/routes/api/admin_modules.py
+++ b/app/modules/tenancy/routes/api/admin_modules.py
@@ -100,7 +100,7 @@ def _build_module_response(
     is_enabled: bool,
 ) -> ModuleResponse:
     """Build ModuleResponse from module code."""
-    from app.modules.enums import FrontendType  # API-007 - Enum for type safety
+    from app.modules.enums import FrontendType  # noqa: API-007 - Enum for type safety
 
     module = MODULES.get(code)
     if not module:
diff --git a/app/modules/tenancy/routes/api/admin_users.py b/app/modules/tenancy/routes/api/admin_users.py
index d7a520bd..8610ec7f 100644
--- a/app/modules/tenancy/routes/api/admin_users.py
+++ b/app/modules/tenancy/routes/api/admin_users.py
@@ -22,7 +22,7 @@ from app.api.deps import get_current_super_admin, get_current_super_admin_api
 from app.core.database import get_db
 from app.exceptions import ValidationException
 from app.modules.tenancy.models import (
-    User,  # API-007 - Internal helper uses User model
+    User,  # noqa: API-007 - Internal helper uses User model
 )
 from app.modules.tenancy.services.admin_platform_service import admin_platform_service
 from models.schema.auth import UserContext
diff --git a/app/modules/tenancy/routes/api/store.py b/app/modules/tenancy/routes/api/store.py
index c72554cf..cf4db2f0 100644
--- a/app/modules/tenancy/routes/api/store.py
+++ b/app/modules/tenancy/routes/api/store.py
@@ -18,7 +18,7 @@ from sqlalchemy.orm import Session
 
 from app.core.database import get_db
 from app.modules.tenancy.schemas.store import StoreDetailResponse
-from app.modules.tenancy.services.store_service import store_service  # mod-004
+from app.modules.tenancy.services.store_service import store_service  # noqa: mod-004
 
 store_router = APIRouter()
 logger = logging.getLogger(__name__)
diff --git a/app/modules/tenancy/schemas/merchant_domain.py b/app/modules/tenancy/schemas/merchant_domain.py
index a5eee29b..dc24fd22 100644
--- a/app/modules/tenancy/schemas/merchant_domain.py
+++ b/app/modules/tenancy/schemas/merchant_domain.py
@@ -34,7 +34,7 @@ class MerchantDomainCreate(BaseModel):
     def validate_domain(cls, v: str) -> str:
         """Validate and normalize domain."""
         # Remove protocol if present
-        domain = v.replace("https://", "").replace("http://", "")  # SEC-034
+        domain = v.replace("https://", "").replace("http://", "")  # noqa: SEC-034
 
         # Remove trailing slash
         domain = domain.rstrip("/")
diff --git a/app/modules/tenancy/schemas/store_domain.py b/app/modules/tenancy/schemas/store_domain.py
index c4319bd5..fde0b12f 100644
--- a/app/modules/tenancy/schemas/store_domain.py
+++ b/app/modules/tenancy/schemas/store_domain.py
@@ -35,7 +35,7 @@ class StoreDomainCreate(BaseModel):
     def validate_domain(cls, v: str) -> str:
         """Validate and normalize domain."""
         # Remove protocol if present
-        domain = v.replace("https://", "").replace("http://", "")  # SEC-034
+        domain = v.replace("https://", "").replace("http://", "")  # noqa: SEC-034
 
         # Remove trailing slash
         domain = domain.rstrip("/")
diff --git a/middleware/auth.py b/middleware/auth.py
index cc22c216..fd7be9d8 100644
--- a/middleware/auth.py
+++ b/middleware/auth.py
@@ -502,6 +502,6 @@ class AuthManager:
             db.refresh(admin_user)
 
             # Log creation for audit trail (credentials redacted for security)
-            logger.info("Default admin user created")  # sec-001 sec-021
+            logger.info("Default admin user created")  # noqa: sec-001 sec-021
 
         return admin_user
diff --git a/pyproject.toml b/pyproject.toml
index 5409d20e..c23f5896 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ include = ["app*", "models*", "middleware*", "storage*"]
 line-length = 88
 target-version = "py311"
 
+
 # Exclude directories
 exclude = [
     ".git",
@@ -34,6 +35,9 @@ exclude = [
 ]
 
 [tool.ruff.lint]
+# Allow custom architecture validator codes in # noqa directives (e.g., SEC-034, SVC-006)
+external = ["SEC", "SVC", "MOD", "API", "ARCH", "PERF"]
+
 # Enable comprehensive rule sets
 select = [
     "E",     # pycodestyle errors