feat: Migrate to ultrathin monolith architecture
Consolidate 3 separate applications (reports-app, data-entry-app, telegram-bot) into a unified
architecture with single backend and frontend:
Backend Changes:
- Unified FastAPI backend at backend/ with modular structure
- Modules: reports, data_entry, telegram in backend/modules/
- Centralized config.py and main.py with all routers registered
- Single worker mode (--workers 1) for Telegram bot compatibility
- Shared Oracle connection pool and JWT authentication
- Unified requirements.txt and environment configuration
Frontend Changes:
- Single Vue.js SPA with module-based routing
- Unified frontend at src/ with modules in src/modules/{reports,data-entry}/
- Shared components and stores in src/shared/
- Error boundaries for module isolation
- Dual API proxy in Vite for module communication
Infrastructure:
- New unified startup scripts: start-prod.sh, start-test.sh, start-backend.sh
- Environment templates: .env.dev.example, .env.test.example, .env.prod.example
- Updated deployment scripts for Windows IIS
- Simplified SSH tunnel management
Documentation:
- Comprehensive CLAUDE.md with architecture overview
- Module-specific docs in docs/{data-entry,telegram}/
- Architecture decision records in docs/ARCHITECTURE-DECISIONS.md
- Deployment guides consolidated in deployment/windows/docs/
This migration reduces complexity, improves maintainability, and enables easier
deployment while maintaining all existing functionality.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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docs/ARCHITECTURE-DECISIONS.md
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docs/ARCHITECTURE-DECISIONS.md
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# Architecture Decision Records (ADR)
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This document records important architectural decisions made during ROA2WEB development.
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---
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## ADR-001: Ultrathin Monolith Architecture (2025-12-24)
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**Status:** Accepted
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**Context:**
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Originally designed as separate microservices (Reports, Data Entry, Telegram Bot as independent services).
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**Decision:**
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Consolidated into **ultrathin monolith** - single FastAPI application with modular structure.
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**Consequences:**
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- ✅ Single Windows service to manage
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- ✅ Shared database connection pool
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- ✅ Simpler deployment
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- ✅ Lower memory usage
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- ✅ Easier debugging
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- ⚠️ Requires careful module isolation
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**Implementation:**
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- All modules under `backend/modules/`
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- Single `ROA2WEB-Backend` service
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- Module enable/disable via `.env` flags
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---
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## ADR-002: Single Worker Configuration (2025-12-29)
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**Status:** Accepted
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**Context:**
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Telegram bot integration causes conflicts when multiple uvicorn workers run simultaneously. Each worker spawns its own bot instance, but Telegram API allows only ONE bot to poll for updates.
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**Problem:**
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```
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telegram.error.Conflict: terminated by other getUpdates request
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```
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**Decision:**
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**Always use `--workers 1` for the unified backend service.**
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**Rationale:**
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1. **Telegram Bot Requirement:** Single bot instance only
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2. **SQLite Cache:** Multiple workers cause locking conflicts
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3. **Performance:** Async I/O means single worker handles 100+ concurrent requests
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4. **Resources:** Lower memory (~400 MB vs ~1.6 GB with 4 workers)
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**Consequences:**
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- ✅ Telegram bot works perfectly
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- ✅ No SQLite cache conflicts
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- ✅ Cache stats endpoint works (no 502 errors)
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- ✅ Lower memory usage
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- ✅ Same performance (I/O bound, not CPU bound)
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- ⚠️ Cannot scale horizontally with multiple processes
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**Implementation:**
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- Configured in NSSM: `--workers 1`
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- NOT configurable in `.env`
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- Documented in `TELEGRAM-BOT-DEPLOYMENT.md`
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**Alternatives Considered:**
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- Separate bot service: More complexity, no significant benefit
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- Redis pub/sub for bot: Over-engineering for current scale
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**Performance Characteristics:**
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- Concurrent users: 100+
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- Requests per minute: 1000+
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- Response time: 50-200ms (DB query time)
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- Adequate for: 50-100 concurrent users
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---
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## ADR-003: IIS Sub-Application Deployment (2025-12-29)
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**Status:** Accepted
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**Context:**
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Application deployed at `/roa2web` path on IIS, not at root.
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**Decision:**
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Use Vite `base: '/roa2web/'` and axios `baseURL: import.meta.env.BASE_URL + 'api'` for all frontend API calls.
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**Consequences:**
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- ✅ Works correctly on production sub-path
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- ✅ Works correctly on development root path
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- ⚠️ All axios instances must use BASE_URL
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- ⚠️ Router must use base path
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**Implementation:**
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- `vite.config.js`: `base: process.env.NODE_ENV === 'production' ? '/roa2web/' : '/'`
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- All `axios.create()`: `baseURL: import.meta.env.BASE_URL + 'api/...'`
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- IIS `web.config`: Reverse proxy rules for `/api/*` → `localhost:8000`
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---
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## ADR-004: Pydantic v2 Migration (2025-12-29)
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**Status:** In Progress
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**Context:**
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Pydantic v2 changed `schema_extra` → `json_schema_extra`.
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**Decision:**
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Update all models incrementally to use `json_schema_extra`.
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**Implementation:**
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- ✅ `backend/modules/reports/models/trial_balance.py` updated
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- ✅ `backend/modules/data_entry/schemas/ocr.py` already correct
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- ⚠️ Warning eliminated in logs
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---
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## ADR-005: Web.config as Static File (2025-12-29)
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**Status:** Accepted
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**Context:**
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IIS requires `web.config` for URL rewrite rules, but it wasn't consistently deployed.
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**Decision:**
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1. Store canonical `web.config` in `deployment/windows/config/`
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2. Create `Create-WebConfig.ps1` script for manual creation
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3. Include in deployment package
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**Consequences:**
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- ✅ Consistent configuration across deployments
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- ✅ Easy to recreate if deleted
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- ✅ Version controlled
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**Implementation:**
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- Canonical: `deployment/windows/config/web.config`
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- Deployed to: `C:\inetpub\wwwroot\roa2web\frontend\web.config`
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- Creation script: `Create-WebConfig.ps1`
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---
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## Future Decisions to Document
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### Pending Considerations
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1. **Horizontal Scaling:**
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- If needed: Load balancer + multiple app instances
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- Alternative: Separate bot service to allow multiple workers
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- Current decision: Single worker sufficient
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2. **Cache Strategy:**
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- Current: SQLite L2 cache + memory L1
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- Alternative: Redis for distributed cache
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- Decision: Keep SQLite for simplicity
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3. **Database Connection Pool:**
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- Current: Shared pool across all modules
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- Sizing: 5-10 connections
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- Per-module pools: Not needed yet
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---
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## Decision Process
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When making architectural decisions:
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1. **Document the context** - Why is this decision needed?
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2. **List alternatives** - What other options exist?
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3. **Explain rationale** - Why this option over others?
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4. **Note consequences** - What are the trade-offs?
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5. **Implementation details** - How is this implemented?
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6. **Reference documentation** - Where to find more details?
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---
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**Last Updated:** 2025-12-29
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