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):

// 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)

Apply DNS Fix - 3-line change in provisionAgent.js (5 minutes)
Test End-to-End - Provision new server, verify DNS creates (10 minutes)
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

Root Cause: Dev container refactor broke hostname formatting contract
EdgePublisher Contract: Expects SHORT hostname, adds zone internally
Quick Win: 3-line fix resolves critical DNS blocking issue
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)

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