revert: Make Wait node fully durable by removing in-memory execution path (backport to release-candidate/2.17.x)

[n8n-assistant]

Description

Backport of #28538 to release-candidate/2.17.x.

Checklist for the author (@shortstacked) to go through.

• Review the backport changes
• Fix possible conflicts
• Merge to target branch

After this PR has been merged, it will be picked up in the next patch release for release track.

Original description

Summary

Reverts #27066 (f025a786e75ec962fcaca469c107324eea8548a3).

This restores the original Wait node behavior where waits shorter than 65 seconds run in-memory via setTimeout, and removes the DB-server-clock-anchored scheduling infrastructure introduced in the reverted PR.

What is restored:

• Wait node: the < 65s in-memory execution path
• WaitTracker: 60s poll interval with Date.now()-based timing
• ExecutionRepository: original getWaitingExecutions() without lookahead window

What is removed:

• ClockRepository and DbClockService (DB server clock syncing)
• n8n_db_clock_skew_ms Prometheus gauge
• 5s poll interval and 15s lookahead window

Review / Merge checklist

• I have seen this code, I have run this code, and I take responsibility for this code.
• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with Backport to Beta, Backport to Stable, or Backport to v1 (if the PR is an urgent fix that needs to be backported)

[codecov]

Bundle Report

Changes will increase total bundle size by 9.27kB (0.02%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
editor-ui-esm	45.71MB	9.27kB (0.02%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: editor-ui-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/worker-*.js	4.65kB	3.17MB	0.15%
assets/index-*.js	-7 bytes	1.31MB	-0.0%
assets/ParameterInputList-*.js	-15 bytes	1.27MB	-0.0%
assets/users.store-*.js	-65 bytes	1.05MB	-0.01%
assets/core-*.js	-16 bytes	622.95kB	-0.0%
assets/useRootStore-*.js	4.63kB	131.22kB	3.66%
assets/canvas.eventBus-*.js	-72 bytes	117.4kB	-0.06%
assets/NodeCreator-*.js	121 bytes	104.04kB	0.12%
assets/settings.store-*.js	-18 bytes	79.8kB	-0.02%
assets/NodeCreator-*.css	142 bytes	76.87kB	0.19%
assets/AppSidebar-*.js	-2 bytes	32.13kB	-0.01%
assets/SettingsAiGatewayView-*.js	-19 bytes	9.95kB	-0.19%
assets/useSettingsItems-*.js	-12 bytes	5.99kB	-0.2%
assets/SettingsLayout-*.js	-2 bytes	5.19kB	-0.04%
assets/useAiGateway-*.js	-48 bytes	1.37kB	-3.39%

[codecov]

Codecov Report

❌ Patch coverage is 70.90909% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
packages/cli/src/wait-tracker.ts	76.19%	10 Missing ⚠️
...s/@n8n/db/src/repositories/execution.repository.ts	0.00%	6 Missing ⚠️

📢 Thoughts on this report? Let us know!

[github-actions]

Performance Comparison

Comparing current → latest master → 14-day baseline

Idle baseline with Instance AI module loaded

Metric	Current	Latest Master	Baseline (avg)	vs Master	vs Baseline	Status
instance-ai-heap-used-baseline	186.72 MB	186.88 MB	186.42 MB (σ 0.27)	-0.1%	+0.2%	⚠️
instance-ai-rss-baseline	390.61 MB	386.52 MB	364.63 MB (σ 22.57)	+1.1%	+7.1%	⚠️

Memory consumption baseline with starter plan resources

Metric	Current	Latest Master	Baseline (avg)	vs Master	vs Baseline	Status
memory-rss-baseline	334.13 MB	288.44 MB	290.51 MB (σ 41.09)	+15.8%	+15.0%	⚠️
memory-heap-used-baseline	114.11 MB	114.39 MB	114.37 MB (σ 0.40)	-0.2%	-0.2%	✅

docker-stats

Metric	Current	Latest Master	Baseline (avg)	vs Master	vs Baseline	Status
docker-image-size-n8n	1269.76 MB	1269.76 MB	1269.76 MB (σ 0.00)	+0.0%	+0.0%	—
docker-image-size-runners	386.00 MB	386.00 MB	390.33 MB (σ 9.21)	+0.0%	-1.1%	✅

How to read this table

• Current: This PR's value (or latest master if PR perf tests haven't run)
• Latest Master: Most recent nightly master measurement
• Baseline: Rolling 14-day average from master
• vs Master: PR impact (current vs latest master)
• vs Baseline: Drift from baseline (current vs rolling avg)
• Status: ✅ within 1σ | ⚠️ 1-2σ | 🔴 >2σ regression

[n8n-assistant]

Got released with n8n@2.17.4