Issue 7858 — paired synthetic runtime proof
Final SHA: 5988add33e72f1de862e7006b01535fd755136b3
Base: 3b95e7831b
Original implementation: 31605ffd80
Execution: Linux only. No browser, dev server, native Windows/WSL or Electron run.

COMMAND 1 (committed regression tests)
vp test run packages/shared/src/usageMerge.test.ts apps/server/src/usage/usageTranscriptReader.test.ts apps/server/src/usage/UsageService.test.ts apps/desktop/src/backend/DesktopBackendConfiguration.test.ts
RESULT
note: You are running `vp test` as a Vite+ built-in command. If you meant to run the test npm script, use `vpr test` instead.

 RUN  v5.0.5 /workspace/issue-7858


 Test Files  4 passed (4)
      Tests  93 passed (93)
   Start at  02:38:24
   Duration  22.61s (tests 42%, transform 35%, import 15%, setup 7%)


COMMAND 2 (temporary runtime matrix)
vp test run --config /tmp/issue7858-proof/vite.config.ts
RESULT
note: You are running `vp test` as a Vite+ built-in command. If you meant to run the test npm script, use `vpr test` instead.

 RUN  v5.0.5 /tmp/issue7858-proof


 Test Files  1 passed (1)
      Tests  1 passed (1)
   Start at  02:41:00
   Duration  5.77s (import 63%, transform 21%, tests 15%)


Paired result (same generated summaries):
Base production merge: 4 sessions / 6 records / 240 tokens / $0.0096.
Repaired production merge: 2 sessions / 3 records / 120 tokens / $0.0048.
Windows-only and WSL-only each: 2 sessions / 3 records / 120 tokens / $0.0048.
Floating point JSON represents $0.0048 as 0.0048000000000000004.

Full captured input and output JSON follows. Paths and hostname are synthetic or sanitized.
The harness forwards filesystem readFile calls to Node's real callback API;
only /proc/self/mountinfo is redirected to an explicit synthetic fixture.
Only synthetic Claude transcript files were scanned (asserted for both sides).
Production code performs parsing, fixed-rate pricing, service scanning and merging.
Windows identity/path/volume/hostname are fixture inputs, not a native Windows read.
WSL's physicalSourceId is generated inside production UsageService/readPhysicalSourceId.
No change to an existing replay without physicalSourceId is claimed.

{
  "sha": "5988add33e72f1de862e7006b01535fd755136b3",
  "execution": "Linux; synthetic public transcripts; no dev server or native Windows/WSL/Electron execution",
  "method": "Production UsageService, transcript reader, pricing and merge. Two Linux scans read one backing directory, second via reporter-style .claude/projects symlink. /proc/self/mountinfo read replaced by explicit WSL2 fixture. Windows path/volume/host and WSL path/volume/host are explicit identity fixtures; Windows physicalSourceId generated by production physicalSourceIdOf, WSL physicalSourceId generated inside production UsageService/readPhysicalSourceId. No native Windows filesystem identity claim.",
  "frozen": {
    "now": "2026-08-02T12:00:00Z",
    "timezone": "UTC",
    "window": {
      "timeZone": "UTC",
      "sinceDay": "2026-07-31",
      "untilDay": "2026-08-02"
    },
    "hourlyWindow": {
      "timeZone": "UTC",
      "sinceDay": "2026-07-31",
      "untilDay": "2026-08-02",
      "resolution": "hour",
      "sinceTime": "2026-08-01T00:00:00Z",
      "untilTime": "2026-08-02T00:00:00Z"
    },
    "rates": {
      "claude-fable-5": {
        "input_cost_per_token": 1e-05,
        "output_cost_per_token": 5e-05
      }
    },
    "transcripts": [
      {
        "file": "a.jsonl",
        "content": "{\"type\":\"assistant\",\"timestamp\":\"2026-08-01T10:00:00Z\",\"requestId\":\"req_1\",\"sessionId\":\"session-a\",\"message\":{\"id\":\"msg_1\",\"model\":\"claude-fable-5\",\"usage\":{\"input_tokens\":10,\"output_tokens\":20}}}\n{\"type\":\"assistant\",\"timestamp\":\"2026-08-01T11:00:00Z\",\"requestId\":\"req_2\",\"sessionId\":\"session-a\",\"message\":{\"id\":\"msg_2\",\"model\":\"claude-fable-5\",\"usage\":{\"input_tokens\":10,\"output_tokens\":30}}}\n"
      },
      {
        "file": "b.jsonl",
        "content": "{\"type\":\"assistant\",\"timestamp\":\"2026-08-01T11:30:00Z\",\"requestId\":\"req_3\",\"sessionId\":\"session-b\",\"message\":{\"id\":\"msg_3\",\"model\":\"claude-fable-5\",\"usage\":{\"input_tokens\":10,\"output_tokens\":40}}}\n"
      }
    ]
  },
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