# Session Summary - December 20, 2025

## 🎯 Session Objectives
Continue DNS record creation debugging from previous session and identify root cause.

## ✅ Work Completed

### 1. **DNS Record Creation Bug Identified**
**File**: `jester/zlh-api/src/api/provisionAgent.js`
**Issue**: EdgePublisher expects SHORT hostname but provisionAgent was passing FQDN
**Root Cause**: Dev container refactor (lines 46, 330-331, 402) accidentally broke hostname formatting
**Impact**: DNS records never created → servers unreachable

**The Fix** (NOT YET APPLIED - Ready for next session):
```javascript
// DELETE Line 46:
const ZONE = process.env.TECHNITIUM_ZONE || "zerolaghub.quest";

// DELETE Lines 330-331:
const slotHostname = `${hostname}.${ZONE}`;

// CHANGE Line 402:
// FROM: slotHostname,
// TO:   slotHostname: hostname,
```

**Expected Behavior After Fix**:
- provisionAgent passes: `hostname: "mc-vanilla-5074"` (SHORT)
- EdgePublisher adds zone internally: `"mc-vanilla-5074.zerolaghub.quest"` (FQDN)
- Matches original working version from commit 9138add

### 2. **Documentation Updates**
Updated `jester/zlh-grind` repository with:
- SESSION_LOG.md: December 20 entry with work completed
- OPEN_THREADS.md: Added "DNS Fix CRITICAL" as top priority
- SCRATCH/dns_fix_reference.md: Quick reference with exact 3-line fix

## 🔍 Technical Analysis

### **Why DNS Records Weren't Creating**
```
CURRENT BROKEN FLOW:
provisionAgent.js (line 402)
├─ slotHostname: "mc-vanilla-5074.zerolaghub.quest" ← FQDN 
└─> EdgePublisher receives FQDN
    └─> Adds .zerolaghub.quest again
        └─> Creates: "mc-vanilla-5074.zerolaghub.quest.zerolaghub.quest" ← INVALID
            └─> DNS record creation FAILS

CORRECT FLOW (after fix):
provisionAgent.js (line 402)
├─ slotHostname: "mc-vanilla-5074" ← SHORT
└─> EdgePublisher receives SHORT
    └─> Adds .zerolaghub.quest internally
        └─> Creates: "mc-vanilla-5074.zerolaghub.quest" ← VALID
            └─> DNS record creation SUCCEEDS
```

### **Historical Context**
- Original implementation (commit 9138add): Worked correctly with SHORT hostnames
- Dev container refactor: Accidentally introduced ZONE variable and FQDN pre-appending
- Bug symptom: Servers provision successfully but unreachable (DNS never created)

## 📋 Next Session Priorities

### **Immediate (Start of Next Session)**
1. **Apply DNS Fix** - 3-line change in provisionAgent.js (5 minutes)
2. **Test End-to-End** - Provision new server, verify DNS creates (10 minutes)
3. **Verify EdgePublisher** - Confirm it still adds zone suffix internally (5 minutes)

### **Then Continue With**
- Dev containers implementation (Day 1 of 3-day sprint)
- WebSocket console streaming
- EdgeState reliability improvements

## 🛠 Files Modified
**None** - Bug identified but fix deferred to next session to maintain context

## 🔗 Reference Documentation
- **Quick Fix Guide**: `jester/zlh-grind/SCRATCH/dns_fix_reference.md`
- **Session Log**: `jester/zlh-grind/SESSION_LOG.md`
- **Open Threads**: `jester/zlh-grind/OPEN_THREADS.md`

## 📊 Platform Status
**Before Session**: 85% complete, DNS bug blocking  
**After Session**: 85% complete, DNS fix identified and documented  
**Next Session**: Apply 3-line fix → 90% complete (DNS functional)

## 💡 Key Insights
1. **Root Cause**: Dev container refactor broke hostname formatting contract
2. **EdgePublisher Contract**: Expects SHORT hostname, adds zone internally
3. **Quick Win**: 3-line fix resolves critical DNS blocking issue
4. **Documentation**: Complete fix guide ready for GPT implementation

---

**Session Duration**: ~45 minutes  
**Session Type**: Debugging + Documentation  
**Next AI**: GPT (implementation of 3-line DNS fix)  
**Blocking Issue**: Resolved (fix identified, ready to apply)