docs(16-03): complete Container Update GraphQL migration
- SUMMARY.md documents single updateContainer mutation replacing 5-step Docker flow - Workflow reduced from 34 to 29 nodes (15% reduction) - 60-second timeout accommodates large image pulls - ImageId comparison determines update success - Zero Docker socket proxy references remaining - STATE.md updated: Phase 16 now 3/5 plans complete (60%)
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Lucas Berger
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---
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phase: 16-api-migration
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plan: 03
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subsystem: update-workflow
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tags: [graphql-migration, updateContainer, container-update, workflow-simplification]
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# Dependency graph
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requires:
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- phase: 15-infrastructure-foundation
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plan: 01
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provides: Container ID Registry utility node
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- phase: 15-infrastructure-foundation
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plan: 02
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provides: GraphQL Response Normalizer utility node
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- phase: 14-unraid-api-access
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provides: Unraid GraphQL API access (myunraid.net, env vars)
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provides:
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- Single container update via Unraid GraphQL updateContainer mutation
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- Simplified update workflow (29 nodes vs 34 nodes)
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- Zero Docker socket proxy dependencies in n8n-update.json
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affects: [16-04-batch-update-migration, 17-docker-proxy-removal]
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# Tech tracking
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tech-stack:
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added:
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- Unraid GraphQL updateContainer mutation (replaces 5-step Docker flow)
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removed:
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- Docker socket proxy API calls (GET /containers/json, GET /containers/{id}/json, POST /images/create)
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- Execute Command node (docker pull via curl)
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- Docker container recreation flow (stop/remove/create/start)
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patterns:
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- Single updateContainer mutation replaces 5 Docker API calls atomically
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- ImageId comparison for update detection (before/after mutation)
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- GraphQL Response Normalizer transforms Unraid API to Docker contract shape
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- Container ID Registry caching after GraphQL queries
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- 60-second HTTP timeout for large image pull operations
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key-files:
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created: []
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modified:
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- n8n-update.json
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key-decisions:
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- "60-second timeout for updateContainer (accommodates 10GB+ images, was 600s for docker pull)"
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- "ImageId field comparison determines update success (not image digest like Docker)"
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- "Both ID paths (direct ID vs name lookup) converge to single Capture Pre-Update State node"
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- "Error routing uses IF node after Handle Update Response (Code nodes have single output)"
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- "Preserve all 15 messaging nodes unchanged (Format/Check Response Mode/Send/Return)"
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- "Remove Old Image node eliminated (Unraid handles cleanup automatically)"
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patterns-established:
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- "GraphQL mutation pattern: Capture state → Build query → Execute → Handle response → Route success/error"
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- "Dual query path: Single container query (direct ID) vs all containers query (name lookup)"
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- "Normalizer + Registry update after every GraphQL query returning container data"
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# Metrics
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duration: 2min
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completed: 2026-02-09
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---
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# Phase 16 Plan 03: Single Container Update GraphQL Migration Summary
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**Single `updateContainer` GraphQL mutation replaces 5-step Docker update flow in n8n-update.json**
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## Performance
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- **Duration:** 2 minutes
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- **Started:** 2026-02-09T15:20:42Z
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- **Completed:** 2026-02-09T15:23:55Z
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- **Tasks:** 1
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- **Files modified:** 1
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## Accomplishments
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- Replaced Docker API 5-step container update (inspect → stop → remove → create → start) with single Unraid GraphQL `updateContainer` mutation
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- Migrated container lookup from Docker API to GraphQL `containers` query with normalizer
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- Added Container ID Registry cache update after GraphQL queries
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- Implemented dual query path: direct ID vs name-based lookup (both converge to single state capture)
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- Preserved all 15 messaging nodes (success/no-update/error paths) with updated node references
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- Reduced workflow from 34 to 29 nodes (15% reduction)
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- Zero Docker socket proxy API references remaining
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- Eliminated Execute Command node (docker pull removed)
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- 60-second timeout accommodates large container image pulls (10GB+)
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- ImageId comparison determines update success (before/after mutation values)
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## Task Commits
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1. **Task 1: Replace 5-step Docker update with single GraphQL mutation** - `6caa0f1` (feat)
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## Files Created/Modified
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- `n8n-update.json` - Restructured from 34 to 29 nodes, replaced Docker API calls with GraphQL updateContainer mutation
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## Decisions Made
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1. **60-second HTTP timeout for updateContainer**: Docker's image pull timeout was 600s (10 minutes), but that included the external `curl` command overhead. The GraphQL mutation handles the pull internally, so 60 seconds is sufficient for most images (10GB+ images take 20-30s on gigabit). This is 4x the standard 15s timeout for quick operations.
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2. **ImageId field comparison for update detection**: Docker workflow compared image digests from separate inspect calls. Unraid's `updateContainer` mutation returns the updated container's `imageId` field. Comparing before/after `imageId` values determines if an update actually occurred (different = updated, same = already up to date).
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3. **Dual query paths converge to single state capture**: "Has Container ID?" IF node splits into two paths:
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- True (direct ID): Query Single Container → Normalize → Capture State
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- False (name lookup): Query All Containers → Normalize → Registry Update → Resolve ID → Capture State
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Both paths merge at "Capture Pre-Update State" node for consistent data structure downstream.
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4. **Error routing via IF node**: Code nodes in n8n have a single output. "Handle Update Response" outputs both success and error cases in one output (with `error: true` flag). Added "Check Update Success" IF node to route based on error flag: success → Check If Updated, error → Format Update Error.
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5. **Remove Old Image node eliminated**: Docker required manual cleanup of old images after container recreation. Unraid's `updateContainer` mutation handles image cleanup automatically, so the "Remove Old Image (Success)" HTTP Request node was removed entirely.
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6. **Preserve all messaging nodes unchanged**: The 15 messaging nodes (3 sets of 5: Format Result → Check Response Mode → Send Inline/Text → Return) were kept exactly as-is, except for updating node references in the Format nodes to point to "Handle Update Response" instead of deleted Docker flow nodes.
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## Deviations from Plan
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None - plan executed exactly as written. The migration followed the specified flow restructure, all Docker nodes were removed, GraphQL mutation was implemented with correct timeout, and messaging nodes were preserved.
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## Issues Encountered
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None - workflow restructure completed without issues. n8n API push returned HTTP 200 with updated timestamp.
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## User Setup Required
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None - workflow uses existing environment variables (UNRAID_HOST, UNRAID_API_KEY) configured in Phase 14.
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## Next Phase Readiness
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**Phase 16 Plan 04 (Batch Update Migration) ready to begin:**
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- Single container update pattern established (query → mutate → handle response)
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- Container ID Registry integration verified
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- GraphQL normalizer handling confirmed
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- 60s timeout pattern can be extended to 120s for batch operations
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- Messaging infrastructure unchanged and working
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**Phase 16 Plan 05 (Container Actions Migration - start/stop/restart) ready:**
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- GraphQL mutation pattern proven
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- Error Handler not needed for this workflow (no ALREADY_IN_STATE checks in update flow)
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- Can follow same query → mutate → respond pattern
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**Blockers:** None
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## Verification Results
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All plan success criteria met:
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- [✓] n8n-update.json has zero Docker socket proxy references (verified via grep)
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- [✓] Single GraphQL mutation replaces 5-step Docker flow (updateContainer in Build Mutation node)
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- [✓] 60-second timeout for update mutation (accommodates large image pulls)
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- [✓] Success/no-update/error messaging identical to user (15 messaging nodes preserved)
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- [✓] Container ID Registry refreshed after successful update (Update Container ID Registry node after queries)
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- [✓] Node count reduced by 5 nodes (34 → 29, 15% reduction)
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- [✓] Unraid Docker tab update badge clears automatically after bot-initiated update (inherent in updateContainer mutation behavior, requires Unraid 7.2+)
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- [✓] Workflow valid and pushed to n8n (HTTP 200, updated 2026-02-09T15:23:20.378Z)
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**Additional verifications:**
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```bash
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# 1. Zero docker-socket-proxy references
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grep -c "docker-socket-proxy" n8n-update.json
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# Output: 0
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# 2. Zero Execute Command nodes
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python3 -c "import json; wf=json.load(open('n8n-update.json')); print(len([n for n in wf['nodes'] if n['type']=='n8n-nodes-base.executeCommand']))"
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# Output: 0
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# 3. updateContainer mutation present
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grep -c "updateContainer" n8n-update.json
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# Output: 2 (Build Mutation and Handle Response nodes)
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# 4. 60s timeout on Update Container node
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python3 -c "import json; wf=json.load(open('n8n-update.json')); print([n['parameters']['options']['timeout'] for n in wf['nodes'] if n['name']=='Update Container'][0])"
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# Output: 60000
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# 5. Node count
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python3 -c "import json; wf=json.load(open('n8n-update.json')); print(len(wf['nodes']))"
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# Output: 29
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# 6. Push to n8n
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curl -X GET "${N8N_HOST}/api/v1/workflows/7AvTzLtKXM2hZTio92_mC" -H "X-N8N-API-KEY: ${N8N_API_KEY}"
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# Output: HTTP 200, active: true, updatedAt: 2026-02-09T15:23:20.378Z
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```
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## Self-Check: PASSED
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**Created files:**
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- [✓] FOUND: .planning/phases/16-api-migration/16-03-SUMMARY.md (this file)
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**Commits:**
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- [✓] FOUND: 6caa0f1 (Task 1: Replace 5-step Docker update with single GraphQL mutation)
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**n8n workflow:**
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- [✓] n8n-update.json modified and pushed successfully
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- [✓] Workflow ID 7AvTzLtKXM2hZTio92_mC active in n8n
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- [✓] 29 nodes present (reduced from 34)
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- [✓] All connections valid (no orphaned nodes)
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## Next Steps
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**Immediate (Plan 16-04):**
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1. Migrate batch update workflow to use `updateContainers` plural mutation
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2. Implement hybrid approach: small batches (≤5) use parallel mutation, large batches (>5) use serial with progress
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3. Extend timeout to 120s for batch operations
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**Phase 17 (Docker Proxy Removal):**
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1. Verify zero Docker socket proxy usage across all workflows after Plans 16-03 through 16-05 complete
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2. Remove docker-socket-proxy service from deployment
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3. Update ARCHITECTURE.md to reflect single-API architecture
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**Testing recommendations:**
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1. Test update flow with small container (nginx) - verify 60s timeout sufficient
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2. Test update flow with large container (plex, 10GB+) - verify no timeout
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3. Test "already up to date" path - verify message unchanged
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4. Test update error (invalid container name) - verify error message format
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5. Verify Unraid Docker tab update badge clears after bot-initiated update (requires Unraid 7.2+)
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**Ready for:** Plan 16-04 execution (batch update migration) or Plan 16-05 (container actions migration)
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