flake: TestChatCostSummary_UnpricedMessages

[flake-investigator]

CI Run

• https://github.com/coder/coder/actions/runs/23128549445
• Job: test-go-pg (windows-2022) (run attempt 1)

Commit

• coder/coder@9c2f217
• Author: dependabot[bot]

Failure

Error Trace: C:/actions-runner/coder/coder/coderd/chats_test.go:3820
Error:       Not equal:
             expected: 1
             actual  : 0
Test:        TestChatCostSummary_UnpricedMessages

Notes

• Only the Windows test-go-pg job failed; macOS passed in the same run.
• No WARNING: DATA RACE, panic, or OOM indicators found in the logs.

Root Cause Assessment

Likely a flaky test in chat cost summary counting for unpriced messages on Windows/PG. The unpriced message count intermittently returns 0 instead of 1.

Assignment Analysis

I can’t run git blame directly here, so I used recent file history as a proxy:

• git log --oneline -10 --follow coderd/chats_test.go
• Most recent relevant change: cbb3841e ("test(chats): verify cost summaries survive model deletion") by Michael Suchacz, which modified chat cost summary tests.

Assigning to the most recent non-trivial modifier of the failing test area.

Suggested Repro

• go test ./coderd -run TestChatCostSummary_UnpricedMessages -count=1 on Windows with Postgres