feat: implement three-tier module classification and framework layer
Module Classification: - Core (4): core, tenancy, cms, customers - always enabled - Optional (7): payments, billing, inventory, orders, marketplace, analytics, messaging - Internal (2): dev-tools, monitoring - admin-only Key Changes: - Rename platform-admin module to tenancy - Promote CMS and Customers to core modules - Create new payments module (gateway abstractions) - Add billing→payments and orders→payments dependencies - Mark dev-tools and monitoring as internal modules New Infrastructure: - app/modules/events.py: Module event bus (ENABLED, DISABLED, STARTUP, SHUTDOWN) - app/modules/migrations.py: Module-specific migration discovery - app/core/observability.py: Health checks, Prometheus metrics, Sentry integration Enhanced ModuleDefinition: - version, is_internal, permissions - config_schema, default_config - migrations_path - Lifecycle hooks: on_enable, on_disable, on_startup, health_check New Registry Functions: - get_optional_module_codes(), get_internal_module_codes() - is_core_module(), is_internal_module() - get_modules_by_tier(), get_module_tier() Migrations: - zc*: Rename platform-admin to tenancy - zd*: Ensure CMS and Customers enabled for all platforms Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# Session Note: Module Reclassification & Framework Layer
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**Date:** 2026-01-27
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**Previous Session:** SESSION_NOTE_2026-01-26_self-contained-modules.md
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**Tag:** v0.9.0-pre-framework-refactor
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## Summary
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Implemented a three-tier module classification system and added core framework infrastructure:
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1. **Three-Tier Classification**
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- Core modules (4): Always enabled, cannot be disabled
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- Optional modules (7): Can be enabled/disabled per platform
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- Internal modules (2): Admin-only tools, not customer-facing
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2. **Module Renaming**
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- Renamed `platform-admin` → `tenancy`
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3. **Core Module Promotion**
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- Promoted CMS and Customers to core (is_core=True)
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4. **New Payments Module**
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- Extracted payment gateway logic into standalone module
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- Billing and Orders now depend on Payments
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5. **Framework Layer Infrastructure**
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- Module events system (events.py)
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- Module-specific migrations support (migrations.py)
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- Observability framework (observability.py)
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---
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## Final Module Classification
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### Core Modules (4)
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| Module | Description |
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|--------|-------------|
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| `core` | Dashboard, settings, profile |
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| `tenancy` | Platform, company, vendor, admin user management |
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| `cms` | Content pages, media library, themes |
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| `customers` | Customer database, profiles, segmentation |
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### Optional Modules (7)
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| Module | Dependencies | Description |
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|--------|--------------|-------------|
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| `payments` | - | Payment gateway integrations (Stripe, PayPal, etc.) |
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| `billing` | payments | Platform subscriptions, vendor invoices |
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| `inventory` | - | Stock management, locations |
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| `orders` | payments | Order management, customer checkout |
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| `marketplace` | inventory | Letzshop integration |
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| `analytics` | - | Reports, dashboards |
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| `messaging` | - | Messages, notifications |
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### Internal Modules (2)
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| Module | Description |
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|--------|-------------|
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| `dev-tools` | Component library, icons |
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| `monitoring` | Logs, background tasks, Flower, Grafana |
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---
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## Key Files Modified/Created
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### Modified
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- `app/modules/registry.py` - Three-tier classification with CORE_MODULES, OPTIONAL_MODULES, INTERNAL_MODULES
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- `app/modules/base.py` - Enhanced ModuleDefinition with new fields:
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- `version` - Semantic versioning
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- `is_internal` - Internal module flag
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- `permissions` - Module-specific permissions
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- `config_schema` - Pydantic config validation
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- `default_config` - Default configuration values
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- `migrations_path` - Module-specific migrations
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- Lifecycle hooks: `on_enable`, `on_disable`, `on_startup`, `health_check`
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- `app/modules/service.py` - No changes needed (uses registry functions)
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- `app/modules/cms/definition.py` - Set is_core=True
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- `app/modules/customers/definition.py` - Set is_core=True
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- `app/modules/billing/definition.py` - Added requires=["payments"]
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- `app/modules/orders/definition.py` - Added requires=["payments"]
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- `app/modules/dev_tools/definition.py` - Added is_internal=True
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- `app/modules/monitoring/definition.py` - Added is_internal=True
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- `alembic/env.py` - Added module migration discovery
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### Created
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- `app/modules/events.py` - Module event bus
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- ModuleEvent enum (ENABLED, DISABLED, STARTUP, SHUTDOWN, CONFIG_CHANGED)
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- ModuleEventData dataclass
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- ModuleEventBus class with subscribe/emit
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- `app/modules/migrations.py` - Module migration utilities
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- discover_module_migrations()
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- get_all_migration_paths()
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- get_migration_order()
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- validate_migration_names()
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- `app/core/observability.py` - Observability framework
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- HealthCheckRegistry
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- MetricsRegistry (Prometheus placeholder)
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- SentryIntegration
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- health_router (/health, /metrics, /health/live, /health/ready)
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- `app/modules/payments/` - New payments module
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- definition.py
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- services/payment_service.py
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- services/gateway_service.py
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- routes/admin.py, vendor.py
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- schemas/__init__.py
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- `alembic/versions/zc2m3n4o5p6q7_rename_platform_admin_to_tenancy.py`
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- `alembic/versions/zd3n4o5p6q7r8_promote_cms_customers_to_core.py`
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---
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## Dependency Graph
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```
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CORE MODULES
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┌────────────────────────────────────────┐
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│ core ← tenancy ← cms ← customers │
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└────────────────────────────────────────┘
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OPTIONAL MODULES
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┌─────────────────────────────────────────┐
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│ payments │
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│ ↙ ↘ │
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│ billing orders │
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│ │
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│ inventory │
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│ ↓ │
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│ marketplace │
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│ │
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│ analytics messaging │
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└─────────────────────────────────────────┘
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INTERNAL MODULES
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┌─────────────────────────────────────────┐
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│ dev-tools monitoring │
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└─────────────────────────────────────────┘
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```
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---
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## New Registry Functions
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```python
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# Module dictionaries
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CORE_MODULES: dict[str, ModuleDefinition]
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OPTIONAL_MODULES: dict[str, ModuleDefinition]
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INTERNAL_MODULES: dict[str, ModuleDefinition]
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MODULES: dict[str, ModuleDefinition] # All combined
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# New helper functions
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get_optional_module_codes() -> set[str]
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get_internal_modules() -> list[ModuleDefinition]
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get_internal_module_codes() -> set[str]
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is_core_module(code: str) -> bool
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is_internal_module(code: str) -> bool
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get_modules_by_tier() -> dict[str, list[ModuleDefinition]]
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get_module_tier(code: str) -> str | None # 'core', 'optional', 'internal', None
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```
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---
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## Module Event System
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```python
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from app.modules.events import module_event_bus, ModuleEvent
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# Subscribe to events
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@module_event_bus.subscribe(ModuleEvent.ENABLED)
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def on_module_enabled(data: ModuleEventData):
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print(f"Module {data.module_code} enabled for platform {data.platform_id}")
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# Emit events (done by ModuleService)
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module_event_bus.emit_enabled("billing", platform_id=1, user_id=42)
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```
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---
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## Module Migrations
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Modules can now have their own migrations in `app/modules/<code>/migrations/versions/`.
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Migration naming convention:
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```
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{module_code}_{sequence}_{description}.py
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Example: cms_001_create_content_pages.py
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```
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Alembic automatically discovers module migrations via `get_all_migration_paths()`.
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---
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## Observability Framework
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```python
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from app.core.observability import (
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health_registry,
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metrics_registry,
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sentry,
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init_observability,
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)
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# Register health check
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@health_registry.register("database")
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def check_db() -> HealthCheckResult:
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return HealthCheckResult(name="database", status=HealthStatus.HEALTHY)
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# Initialize in lifespan
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init_observability(
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enable_metrics=True,
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sentry_dsn="...",
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flower_url="http://flower:5555",
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)
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```
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Endpoints:
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- `GET /health` - Aggregated health from all checks
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- `GET /health/live` - Kubernetes liveness probe
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- `GET /health/ready` - Kubernetes readiness probe
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- `GET /metrics` - Prometheus metrics
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- `GET /health/tools` - External tool URLs (Flower, Grafana)
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---
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## Payments Module
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New standalone module for payment gateway abstractions:
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```python
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from app.modules.payments.services import PaymentService, GatewayService
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payment_service = PaymentService()
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result = await payment_service.process_payment(
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amount=1000, # cents
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currency="EUR",
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payment_method_id="pm_xxx",
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)
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gateway_service = GatewayService()
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gateways = gateway_service.get_available_gateways()
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```
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**Separation from Billing:**
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- **Payments**: Gateway abstractions, payment processing, refunds
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- **Billing**: Subscriptions, invoices, tier management (uses Payments)
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- **Orders**: Checkout, order payments (uses Payments)
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---
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## Verification Completed
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✅ App starts successfully
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✅ Core modules: core, tenancy, cms, customers
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✅ Optional modules: payments, billing, inventory, orders, marketplace, analytics, messaging
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✅ Internal modules: dev-tools, monitoring
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✅ Dependencies validated (billing→payments, orders→payments, marketplace→inventory)
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✅ Module event bus working
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✅ Observability framework working
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✅ Migration discovery working
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---
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## Next Steps
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1. **Phase 6: Make Customers Self-Contained** (deferred)
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- Move models, services to app/modules/customers/
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- Create module-specific migrations
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2. **Database Migrations**
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- Run: `alembic upgrade head`
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- This will rename platform-admin → tenancy in platform_modules
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3. **Integrate Observability**
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- Add health_router to main.py
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- Initialize observability in lifespan
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4. **Add Module Health Checks**
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- Implement health_check on modules that need monitoring
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- Call register_module_health_checks() on startup
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5. **Payments Module Implementation**
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- Implement actual Stripe/PayPal gateway logic
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- Add Payment, Transaction models
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- Create module migrations
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