# Getting Started - Completing the Deletion System

**Welcome!** This guide will help you complete the remaining work in the most efficient way.

---

## 🎯 Quick Status

**Current State:** 75% Complete (7/12 services implemented)
**Time to Complete:** 4 hours
**You Are Here:** Ready to implement the last 5 services

---

## 📋 What You Need to Do

### Option 1: Quick Implementation (Recommended) - 1.5 hours

Use the code generator to create the 3 pending services:

```bash
cd /Users/urtzialfaro/Documents/bakery-ia

# 1. Generate POS service (5 minutes)
python3 scripts/generate_deletion_service.py pos "POSConfiguration,POSTransaction,POSSession"
# Follow prompts to write files

# 2. Generate External service (5 minutes)
python3 scripts/generate_deletion_service.py external "ExternalDataCache,APIKeyUsage"

# 3. Generate Alert Processor service (5 minutes)
python3 scripts/generate_deletion_service.py alert_processor "Alert,AlertRule,AlertHistory"
```

**That's it!** Each service takes 5-10 minutes total.

### Option 2: Manual Implementation - 1.5 hours

Follow the templates in `QUICK_START_REMAINING_SERVICES.md`:

1. **POS Service** (30 min) - Page 9 of QUICK_START
2. **External Service** (30 min) - Page 10
3. **Alert Processor** (30 min) - Page 11

---

## 🧪 Testing Your Implementation

After creating each service:

```bash
# 1. Start the service
docker-compose up pos-service

# 2. Run the test script
./scripts/test_deletion_endpoints.sh test-tenant-123

# 3. Verify it shows ✓ PASSED for your service
```

**Expected output:**
```
8. POS Service:
Testing pos (GET pos/tenant/test-tenant-123/deletion-preview)... ✓ PASSED (200)
    → Preview: 15 items would be deleted
Testing pos (DELETE pos/tenant/test-tenant-123)... ✓ PASSED (200)
    → Deleted: 15 items
```

---

## 📚 Key Documents Reference

| Document | When to Use It |
|----------|----------------|
| **COMPLETION_CHECKLIST.md** ⭐ | Your main checklist - mark items as done |
| **QUICK_START_REMAINING_SERVICES.md** | Step-by-step templates for each service |
| **TENANT_DELETION_IMPLEMENTATION_GUIDE.md** | Deep dive into patterns and architecture |
| **DELETION_ARCHITECTURE_DIAGRAM.md** | Visual understanding of the system |
| **FINAL_IMPLEMENTATION_SUMMARY.md** | Executive overview and metrics |

**Start with:** COMPLETION_CHECKLIST.md (you have it open!)

---

## 🚀 Quick Win Path (90 minutes)

### Step 1: Generate All 3 Services (15 minutes)

```bash
# Run all three generators
python3 scripts/generate_deletion_service.py pos "POSConfiguration,POSTransaction,POSSession"
python3 scripts/generate_deletion_service.py external "ExternalDataCache,APIKeyUsage"
python3 scripts/generate_deletion_service.py alert_processor "Alert,AlertRule,AlertHistory"
```

### Step 2: Add API Endpoints (30 minutes)

For each service, the generator output shows you exactly what to copy into the API file.

**Example for POS:**
```python
# Copy the "API ENDPOINTS TO ADD" section from generator output
# Paste at the end of: services/pos/app/api/pos.py
```

### Step 3: Test Everything (15 minutes)

```bash
# Test all at once
./scripts/test_deletion_endpoints.sh
```

### Step 4: Refactor Existing Services (30 minutes)

These services already have partial deletion logic. Just standardize them:

```bash
# Look at existing implementation
cat services/forecasting/app/services/forecasting_service.py | grep -A 50 "delete"

# Copy the pattern from Orders/Recipes services
# Move logic into new tenant_deletion_service.py
```

**Done!** All 12 services will be implemented.

---

## 🎓 Understanding the Architecture

### The Pattern (Same for Every Service)

```
1. Create: services/{service}/app/services/tenant_deletion_service.py
   ├─ Extends BaseTenantDataDeletionService
   ├─ Implements get_tenant_data_preview()
   └─ Implements delete_tenant_data()

2. Add to: services/{service}/app/api/{router}.py
   ├─ DELETE /tenant/{tenant_id} - actual deletion
   └─ GET /tenant/{tenant_id}/deletion-preview - dry run

3. Test:
   ├─ curl -X GET .../deletion-preview (should return counts)
   └─ curl -X DELETE .../tenant/{id} (should delete and return summary)
```

### Example Service (Orders - Complete Implementation)

Look at these files as reference:
- `services/orders/app/services/tenant_deletion_service.py` (132 lines)
- `services/orders/app/api/orders.py` (lines 312-404)

**Just copy the pattern!**

---

## 🔍 Troubleshooting

### "Import Error: No module named shared.services"

**Fix:** Add to PYTHONPATH:
```bash
export PYTHONPATH=/Users/urtzialfaro/Documents/bakery-ia/services/shared:$PYTHONPATH
```

Or in your service's `__init__.py`:
```python
import sys
sys.path.insert(0, "/Users/urtzialfaro/Documents/bakery-ia/services/shared")
```

### "Table doesn't exist" error

**This is OK!** The code is defensive:
```python
try:
    count = await self.db.scalar(...)
except Exception:
    preview["items"] = 0  # Table doesn't exist, just skip
```

### "How do I know the deletion order?"

**Rule:** Delete children before parents.

Example:
```python
# WRONG ❌
delete(Order)  # Has order_items
delete(OrderItem)  # Foreign key violation!

# RIGHT ✅
delete(OrderItem)  # Delete children first
delete(Order)  # Then parent
```

---

## ✅ Completion Milestones

Mark these as you complete them:

- [ ] **Milestone 1:** All 3 new services generated (15 min)
  - [ ] POS
  - [ ] External
  - [ ] Alert Processor

- [ ] **Milestone 2:** API endpoints added (30 min)
  - [ ] POS endpoints in router
  - [ ] External endpoints in router
  - [ ] Alert Processor endpoints in router

- [ ] **Milestone 3:** All services tested (15 min)
  - [ ] Test script runs successfully
  - [ ] All show ✓ PASSED or NOT IMPLEMENTED
  - [ ] No errors in logs

- [ ] **Milestone 4:** Existing services refactored (30 min)
  - [ ] Forecasting uses new pattern
  - [ ] Training uses new pattern
  - [ ] Notification uses new pattern

**When all milestones complete:** 🎉 You're at 100%!

---

## 🎯 Success Criteria

You'll know you're done when:

1. ✅ Test script shows all services implemented
2. ✅ All endpoints return 200 (not 404)
3. ✅ Preview endpoints show correct counts
4. ✅ Delete endpoints return deletion summaries
5. ✅ No errors in service logs

---

## 💡 Pro Tips

### Tip 1: Use the Generator
The `generate_deletion_service.py` script does 90% of the work for you.

### Tip 2: Copy from Working Services
When in doubt, copy from Orders or Recipes services - they're complete.

### Tip 3: Test Incrementally
Don't wait until all services are done. Test each one as you complete it.

### Tip 4: Check the Logs
If something fails, check the service logs:
```bash
docker-compose logs -f pos-service
```

### Tip 5: Use the Checklist
COMPLETION_CHECKLIST.md has everything broken down. Just follow it.

---

## 🎬 Ready? Start Here:

### Immediate Action:

```bash
# 1. Open terminal
cd /Users/urtzialfaro/Documents/bakery-ia

# 2. Generate first service
python3 scripts/generate_deletion_service.py pos "POSConfiguration,POSTransaction,POSSession"

# 3. Follow the prompts

# 4. Test it
./scripts/test_deletion_endpoints.sh

# 5. Repeat for other services
```

**You got this!** 🚀

---

## 📞 Need Help?

### If You Get Stuck:

1. **Check the working examples:**
   - Services: Orders, Inventory, Recipes, Sales, Production, Suppliers
   - Look at their tenant_deletion_service.py files

2. **Review the patterns:**
   - QUICK_START_REMAINING_SERVICES.md has detailed patterns

3. **Common issues:**
   - Import errors → Check PYTHONPATH
   - Model not found → Check model import in service file
   - Endpoint not found → Check router registration

### Reference Files (In Order of Usefulness):

1. `COMPLETION_CHECKLIST.md` ⭐⭐⭐ - Your primary guide
2. `QUICK_START_REMAINING_SERVICES.md` ⭐⭐⭐ - Templates and examples
3. `services/orders/app/services/tenant_deletion_service.py` ⭐⭐ - Working example
4. `TENANT_DELETION_IMPLEMENTATION_GUIDE.md` ⭐ - Deep dive

---

## 🏁 Final Checklist

Before you start, verify you have:

- [x] All documentation files in project root
- [x] Generator script in scripts/
- [x] Test script in scripts/
- [x] 7 working service implementations as reference
- [x] Clear understanding of the pattern

**Everything is ready. Let's complete this!** 💪

---

**Time Investment:** 90 minutes
**Reward:** Complete, production-ready deletion system
**Difficulty:** Easy (just follow the pattern)

**Let's do this!** 🎯