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FeedMyLedger Immutable Ledger

Rust, Google Sheets API, Microsoft Graph Excel
Published Jan 15, 2026
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Project Overview

FeedMyLedger is a Rust library plus command-line interface that treats cloud-based spreadsheets as double-entry ledgers. Instead of editing rows in place, every adjustment appends a new record referencing the original entry, mirroring traditional accounting controls.

Core Features

  • Pluggable adapters for Google Sheets (Sheets v4 API) and Microsoft Excel 365, along with a local CSV adapter for offline storage.
  • Immutable storage model enforced via row hashes and verification commands to detect tampering.
  • Resilient REST calls with exponential backoff and configurable batch sizes for high-volume uploads.
  • OAuth2-powered authentication flows so users can securely link their accounts from the CLI without bundling third-party wrappers.

Developer Ergonomics

  • High-level Ledger and Record APIs exposed through a consumable crate (feed-my-ledger = "2.0.0") for embedding in Rust services.
  • Batteries-included CLI supporting add/list/adjust/share/import/switch workflows, including mapping flags for CSV/QIF/OFX/Ledger/JSON ingestion and bank API downloads (feature gated).
  • Configuration-driven setup via config.toml, covering OAuth credentials, sheet IDs, scheduled postings, and budget thresholds.

Impact

  • Gives indie builders and finance teams an audit-friendly bookkeeping layer without provisioning databases.
  • Demonstrates how append-only accounting concepts translate to commodity cloud spreadsheets, encouraging transparent financial ops.
  • Serves as a reference for robust API retries, OAuth integrations, and CLI UX patterns in the Rust ecosystem.

Technologies & Concepts

Personal Finance Append-Only Ledger