# Session Log — ZeroLagHub (Execution Ledger)

Chronological ledger of notable execution work. Keep this high signal; link to code PRs/commits in upstream repos when available.

---

## 2026-02-07 → 2026-02-08 — Console stabilization
- Migrated console from log tailing to **PTY-backed interactive console** over WebSockets.
- Hardened WS stability:
  - moved to a single-writer pattern
  - ensured exactly one PTY read loop per `{vmid, container_type}`
- Fixed "it works but not on prod" issues caused by stale binaries still running.
- Confirmed systemd points to `/opt/zlh-agent/current/zlh-agent` with `current -> releases/<ver>` layout.

---

## 2026-02-21 → 2026-02-22 — Game telemetry routing + agent Phase 1 feature set

### API (control plane)
- Added `src/routes/game.js`, mounted at `/api/game`.
- Added:
  - `GET /api/game/servers/:id/players` (Redis-backed, normalized response)
  - `GET /api/game/servers/:id/update-status` (agent version + update state)
- Extended `src/utils/agentPoller.js`:
  - poll agent `GET /game/players` for game containers
  - poll agent `GET /version` + `GET /agent/update/status`
  - cache `agentVersion`, `updateStatus`, `updateAvailable`
- Persisted `engineType`/`engineVersion` in `ContainerInstance` on provisioning.
- Rolled back provisioning-time agent update triggers (back to direct `/config` flow).

### Frontend (portal)
- Game console polling switched to:
  - `GET /api/game/servers/:id/players`
  - `GET /api/game/servers/:id/update-status`
- UI shows player count + optional name list.
- Version context rendered as `Version: X` or `Version: X -> Y`.

### Agent (runtime)
- `/game/players` hardened for more reliable Minecraft presence (port/protocol fallbacks).
- Added periodic update checks:
  - `ZLH_AGENT_UPDATE_MODE=notify|auto|off`
  - `ZLH_AGENT_UPDATE_INTERVAL` (default `30m`)
- Implemented Phase 1 mod management:
  - `GET /game/mods`
  - `POST /game/mods/install` (allowlist + redirect constraints + size cap + sha256 verify)
  - `PATCH /game/mods/:mod_id` (enable/disable)
  - `DELETE /game/mods/:mod_id` (moves to `mods-removed/`)
- Implemented `GET /metrics/process` (PID + VmRSS/VmSize; restart_count mapped to crashCount).
- Added Minecraft readiness probe after start/restart and stop-wait-before-restart sync to reduce restart races.
- Added `lifecycle.log` for lifecycle/probe diagnostics.

### Artifacts
- Expanded Minecraft artifact tree to include **NeoForge** under `/opt/zlh/zpacks/minecraft/neoforge/<mc_version>/`.
- Encountered installer naming contract mismatch; Phase 1 fix is to normalize the NeoForge installer filename for predictable installs.

---

## 2026-02-22 — Architecture strategy session (Claude)

### Artifact server strategy decided
- Moved away from self-hosting all mod artifacts.
- `zlh-artifactd` Phase 1 scope: **mod resolver only** (Modrinth API + NeoForge maven).
  - No local mod storage in Phase 1; agent fetches from upstream, verifies hash.
  - Local caching added in Phase 2 based on real usage patterns.
- Full artifact orchestrator (game jars, runtimes, mods unified) is the Phase 3 vision.
- Rationale: single-operator sustainability; learn ingestion patterns from mods before automating game jars.

### Mod platform decision
- **Modrinth** as primary source (open API, no key required, hash provided, NeoForge/Fabric/Forge/Quilt filter support).
- **CurseForge**: manual SFTP upload by user (their friction, not ours).
- Modrinth API base: `api.modrinth.com/v2`, rate limit 300 req/min, requires User-Agent header.

### NeoForge versions for artifact server
- **1.21.1** — highest mod ecosystem density (16,000+ mods)
- **1.21.4** — next significant stable adoption
- **1.21.11** — current latest
- 1.20.x NOT needed for NeoForge; existing Forge covers that ecosystem.

### Vanilla MC versions to add
- Currently at 1.21.7; need to add 1.21.8 through 1.21.11.
- Source: Mojang version manifest at `piston-meta.mojang.com/mc/game/version_manifest_v2.json`.

### Confirmed loader coverage at launch
- Vanilla, Paper, Purpur, Forge, Quilt (covers Fabric mods too) — already in place.
- NeoForge added (3 versions above).
- No Fabric standalone needed; Quilt provides compatibility.

---

## 2026-02-23 — Mod System Now Operational

Full mod lifecycle implemented and confirmed end-to-end.

### What shipped
- Modrinth search integrated (`GET /api/game/mods/search`)
- Full install/list/enable/disable/delete routes live behind auth + ownership
- Agent host allowlist expanded to include `cdn.modrinth.com`
- Filename validation updated to allow `+` (required for Modrinth filenames like `sodium-neoforge-0.6.13+mc1.21.4.jar`)
- Engine metadata bug fixed: `engineType="neoforge"`, `engineVersion="1.21.4"` (was `"minecraft"` / `"neoforge-1.21.4"`)
- API → Agent payload contract corrected (field names and `source` field)
- Frontend: mod search drawer, installed panel, enable/disable/delete, toast notifications

### System state
- Full lifecycle via API: ✅
- Frontend search + install: ✅
- Enable/disable/delete: ✅
- Installed flag displayed: ✅
- Soft delete to `/mods-removed`: ✅
- No retention automation: intentional
- No install queue: intentional
- Filesystem authoritative: confirmed

### Known tradeoffs locked in
- No deterministic Modrinth project ID persistence (installed detection is heuristic)
- No DB tracking of mod state
- Soft delete is permanent until file browser enables manual restore

### Pending
- Response corruption investigation (one early curl output appeared malformed)
- API error mapping: `"mod already exists"` → `409` (currently `502`)
- Portal UI wiring for install flow

---

## Next session targets
- Reproduce and resolve response corruption with clean curl test
- Tighten API error mapping
- Begin file browser (agent + API + frontend) — see `OPEN_THREADS.md`