From 5966e6cee62817114e99dca31fba58fb2e8e48d4 Mon Sep 17 00:00:00 2001
From: Alexandr Mansurov <alex@eghuro.cz>
Date: Wed, 21 Jan 2026 22:42:32 +0100
Subject: [PATCH] CLAUDE.md

---
 CLAUDE.md | 69 ++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 43 insertions(+), 26 deletions(-)

diff --git a/CLAUDE.md b/CLAUDE.md
index 6aa9d63..41fb4b4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,6 +2,27 @@
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
+## Project Summary
+
+Log ingestion tool that parses application log files and loads them into SQLite for analysis. Primary use case is analyzing mobile app telemetry - tracking feature adoption (autofill, touchID, offline login), app versions, device models, etc.
+
+### What it does
+- Parses log lines containing `signature:` messages with app/device telemetry
+- Extracts: sessionId, timestamp, app name, version, OS, model, device, and feature flags
+- Converts yes/no to booleans, parses numeric usage counters
+- Loads into SQLite with indexes on session_id and version for efficient queries
+
+### Log format
+Logs are stored in `<base_dir>/YYYY/MM/DD/<filename>` structure, either as `.log` (plain) or `.log.gz` (gzip compressed). A single day can exceed 10GB.
+
+Example signature message:
+```
+msg="signature:XAMARIN_APP/5.23.0/ details:offlineLoginUsage:0,isPasswordAutofillEnabled:no,cameraRollUsage:0,OS:26.2.0,appName:App,touchID:yes,isOfflineLoginEnabled:yes,model:iPhone15,3,device:iOS, Apple,passwordAutofillUsage:0 user-agent:..."
+```
+
+### Extensibility
+The parser uses a `MessageParser` trait allowing new message types to be added. Currently only `signature:` messages are parsed; other message types are skipped.
+
 ## Commands
 
 ### Build & Run
@@ -12,8 +33,11 @@ cargo build
 # Release build
 cargo build --release
 
-# Run (example)
-cargo run -- --name "World"
+# Run with single file
+cargo run -- --file /path/to/logs.log --output output.db
+
+# Run with date range
+cargo run -- --from 2026/01/20 --to 2026/01/21 --base-dir /var/log/app --filename app.log --output output.db
 ```
 
 ### Testing
@@ -26,9 +50,6 @@ cargo nextest run
 
 # Run a single test
 cargo test test_name
-
-# Generate coverage (requires cargo-llvm-cov)
-cargo llvm-cov nextest --lcov --output-path lcov.info
 ```
 
 ### Quality Checks
@@ -43,29 +64,25 @@ cargo fmt
 cargo clippy
 ```
 
-### Benchmarks
-```bash
-# Requires nightly toolchain
-cargo +nightly bench
-```
-
 ## Architecture
 
-### Project Structure
-- **cargo-generate template**: This repository is a template for generating new Rust CLI projects
-- **CLI parser**: Uses clap v4 derive macros for command-line argument processing
-- **Benchmarks**: Located in `benches/` directory, uses nightly compiler's test crate
+### Source Files
+- **src/main.rs**: CLI argument parsing (clap), orchestrates file discovery and processing
+- **src/parser.rs**: Log line parsing, `MessageParser` trait, `SignatureParser` implementation
+- **src/db.rs**: SQLite schema creation, batched inserts
+- **src/files.rs**: File discovery by date range, handles .gz and plain files
 
-### CI/CD Configuration
-- **ci.yaml**: Main CI workflow
-  - Runs formatting, Clippy, build, and tests
-  - Generates coverage on Linux with octocov reporting
-  - Automatic PR feedback via reviewdog
-- **benchmark.yaml**: Auto-deploys benchmark results to GitHub Pages
+### Database Schema
+Table `signature_entries` with columns: session_id, timestamp, app, version, offline_login_usage, is_password_autofill_enabled, camera_roll_usage, os, app_name, touch_id, is_offline_login_enabled, model, device, password_autofill_usage.
+
+Indexes on `session_id` and `version`.
+
+### Key Design Decisions
+- Batched inserts (default 10k rows per transaction) for performance
+- Regex-based parsing with lazy static compilation
+- Extensible via `MessageParser` trait + `ParsedMessage` enum
+
+## CI/CD Configuration
+- **ci.yaml**: Formatting, Clippy, build, and tests
 - **audit.yaml**: Security audit for dependencies
 - **release.yaml**: Automated release on tag push (cross-platform builds via GoReleaser)
-
-### Key Settings
-- **Rust version**: Fixed to 1.87 in `rust-toolchain.toml`
-- **Edition**: Uses Rust 2024 edition
-- **Test tools**: cargo-nextest and cargo-llvm-cov recommended
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