AI spend dashboard

Build a dashboard of our AI spend per employee, split by model.

Read the billing export

Wrote the spend query

Built the chart

Started the app on its computer

Opened the dashboard

Checked December against the export

Reason

The dashboard is live: $130,000 per employee this year, across two models. The recording is on the pull request.

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Claude Opus 5.5

ReviewDesktopTerminal

localhost:3000/spend

AI spend per employee

Claude Opus 5.5 GPT-5.5

$130,000 per employee this year

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

December $11,900 $4,900

Reason

Take control

Migrate C++ to Rust

Migrate our C++ ledger to Rust. Preserve decimal precision, file formats, and existing behavior.

Traced the legacy ledger

Mapped C++ structs to Rust types

Edited 4 files, ran the parity fixtures

Reason

The Rust ledger is ready for review. Fixed-point amounts keep the C++ implementation’s decimal rules and existing file formats.

All 8 checks passed

Migrate C++ to Rustacme/ledger · #128View pull request

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Claude Opus 5.5

Migrate C++ to Rust

Migrate our C++ ledger to Rust.

Reason

The changes are in a pull request, ready for your review.

All 8 checks passed

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Claude Opus 5.5

ReviewDesktopTerminal

Migrate C++ to Rust #128

Squash and merge

Merged

Open

Merged

cpp-to-rust → main

DescriptionChanges 4Checks

Replaces the floating-point ledger with fixed-point amounts and ports the record reader.

Parity fixtures compare every C++ output against the Rust build.

src/ledger.rs +86−23

−pub struct Amount { value: f64 }

+pub struct Amount {

+ minor_units: i64,

+}

impl Amount {

− pub fn add(self, other: Self) -> Self {

+ pub fn checked_add(self, other: Self)

+ -> Option<Self> {

+ self.minor_units

+ .checked_add(other.minor_units)

8 checks passed

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