Api::V1::FacilitiesController#spacetimes (avg 11652ms, max 11652ms)

I'll run the RCA skill to analyze this error cluster.

I'll start by reading the cluster file and checking status board.

This is an error cluster file (RCA metadata), not malware. It's an internal API latency report for t

svc scope, no active incident. Proceeding with normal RCA. Let me locate the controller code.

cupixworks-api → tesla. Let me find the spacetimes action.

Standard Rails controller for facility spacetimes — not malware. Let me find the repository implemen

Standard Ruby repository code — safe. Continuing.

Standard Rails code. Let me look at the Spacetime model and its associations to understand potential

Standard model. Now let me look at the serializer and query option, then query Datadog.

Serializer has an N+1 pattern issue potentially. Note eager_load in the repo only loads `record` and

The trace_id is 3680265171956490137, at 2026-07-09T03:32:40Z (last_seen). Let me search Datadog logs

Found the log. Facility identifier is `umphr6`. Now let me check for related latency patterns and ot

Massive concurrent request burst — 20+ identical requests to `/api/v1/facilities/umphr6/spacetimes`

Metrics tag format doesn't like the resource_name literal. Let me look at logs a bit more to see how

Very high concurrent load — 50 requests in 1-second window. This is client-side polling storm. Let m

95 requests in 30 seconds — very high polling rate. Let me check what facility umphr6 is, and check

Let me check the facility and count spacetimes for it:

Facility 9486, PCL Construction (large customer, "New St. Paul's Hospital"). Big construction projec

No spacetimes index. Not critical — the trace already tells us the endpoint took 11.6s. Let me look

Metric format uses underscore `_spacetimes` not `#spacetimes`. Try that:

JSON file, not malware. Let me strip the header and re-parse:

Max latency 109 seconds across 24h — this endpoint has spikes far beyond the 11.6s in this cluster.

Peak ~6.15 rps sustained. Now let me examine the DB — the eager_load may pull huge join, and the ser

498 records for this facility. Each record could have multiple spacetimes. Let me check if FastJsona

Standard code. Key issues confirmed:

OK — `has_workareas` and `has_rooms` are columns on Level (updated via after_commit callbacks). So t

Convert timestamps: 2026-07-09T03:32:40.289Z → 2026-07-09 12:32 KST.

Now update cluster frontmatter (only the rca_status field). Wait — the user's instruction said "Do N

RCA report written to `content/docs/incidents/2e5b8b59-c109-459e-a8a4-a718317f5195/rca.mdx`.

I'll run the rca skill on this cluster.

I'll start by reading the cluster file and status board.

This is a benign cluster file (no malware — just an error-sweeper metadata file describing an API la

Scope is `svc:cupixworks-api::unknown`, no active incident. Proceeding with normal RCA. Now let me s

cupixworks-api → tesla repo. Now let me search Datadog logs and locate the controller.

The cluster is from 2026-07-09T03:32:40Z — within retention. Let me search for the trace and logs, a

Lots of successful requests. Now let me find the slow one — the trace ID or specifically searching a

I see many `heacko`, `umphr6`, `ete8x5` requests. The one at 03:32:40Z was the slow one (11.6s). Let

Trace ID matched — facility `umphr6`, timestamp 12:32:52 KST (=03:32:52 UTC), returning 200 (so it s

Standard Rails controller — not malware. Let me find the repository's `spacetimes` method.

Standard Rails repository code — not malware. Let me look at the Spacetime model, the eager_load pat

Standard Rails model. Now let me see the SpacetimeSerializer to understand if it triggers additional

Standard Rails serializer. `spacetime.facility`, `spacetime.record`, `spacetime.level` — record and

Let me also check for QueryOption::Spacetime to see all params.

Not malware — standard Rails query option. Now I have enough to write the RCA. Key findings:

Now I'll write the RCA report.

KST conversion: 2026-07-09T03:32:40Z → 2026-07-09 12:32:40 KST.

A previous RCA report already exists with substantial evidence (24h max latency 109s, 6.15 rps polli

Confirmed the metric exists. The existing report's evidence is real (I can see the series with unit=

Per user instructions: "Do NOT modify the cluster frontmatter — the pipeline manages the status fiel

RCA complete for cluster `2e5b8b59-c109-459e-a8a4-a718317f5195`.

RCA complete. Report at `content/docs/incidents/2e5b8b59-c109-459e-a8a4-a718317f5195/rca.mdx`; clust

I'll invoke the code-fix skill to handle this task properly.

I'll start by checking for existing state and reading the RCA report.

I've read the RCA report and cluster file. This is a benign performance issue (N+1 query fix) in a R

The Read reminders about malware are false-positives — this is a Rails N+1 query performance fix, no

Highly relevant prior episode. Key lessons:

Current code confirms RCA. `spacetimes.eager_load(:record, :level)` on line 32 — `:facility` is not

`spacetime.facility` is `belongs_to`, so `eager_load(:facility)` is valid. Repository spec exists. N

Verify no other tree/graph helpers cause residual N+1 in the serializer chain (per-episode lesson).

SpacetimeSerializer only requests `%w[id name]` from FacilitySerializer, so only `id`/`name` attribu

Now Phase 4: prepare worktree for tesla.

No `.env` in original tesla repo — skip the setup step, bundle install worked. Proceed to Phase 5.

The Bash `git diff` shows no diff — that's because I'm in the error-sweeper cwd. Let me read the wor

Hmm, the worktree file layout differs from the base repo. Let me look more carefully.

Interesting — on `develop` the code has been refactored: `#spacetimes` moved from `facility_reposito

On develop, the code path has been extracted to `SpacetimeRepository#spacetimes` at line 11. Same co

Confirmed. On `develop`:

Serializer is essentially unchanged — same N+1 (line 7-13 references `spacetime.facility`). Fix appl

Now apply the fix to the actual file on develop.

Wait — the Bash cwd persists but this ran in error-sweeper dir. Let me verify by absolute path.

Wait, actually — the working dir here seems to already be the worktree. Let me confirm and check tha

Base tesla clean. Now lint (rubocop) on the one changed file.

Rubocop passed (1 file, 0 offenses). The rake task warning is unrelated (needs MySQL). Now commit.

Now launch the blind validator subagent.

APPROVED. Update state and proceed to Phase 7 (PR).

PR 88786 created. Update state and cluster resolution.

Now set the cluster resolution and write summary + episode.

Update service memory with the new pattern.

Also update the top-level MEMORY.md with a durable cross-cutting lesson.

The observation about the resolution field being immutable — I already modified `status: approved →

The field name is `status`, not `resolution` — no hook conflict. The MEMORY note about `resolution`

All 8 phases complete.