Steam Market History Helper

Steam's market history page is slow, paginated, and impossible to search. This extension fixes all of that. Steam Market History Helper syncs your complete transaction history into a local SQLite database — right in your browser. No servers, no accounts, no data collection. Your trades stay on your machine. 🗄️ REAL DATABASE — NOT A TOY Built on SQLite with Origin Private File System — the same database engine used by apps processing billions of rows. Tested and proven with over 1,000,000 transactions across multiple accounts. No crashes, no slowdowns, no data corruption. Other tools choke at a fraction of this scale. 🔄 RELIABLE BACKGROUND SYNC Set it and forget it. The extension fetches your history automatically with smart resume — it picks up exactly where it left off, even after browser restarts or connection errors. Exponential backoff handles Steam's rate limits gracefully. Real-time progress tracking in the popup, with milestone notifications every 10,000 items during bulk sync. 🔍 15+ SEARCH FILTERS — SQL FAST Filter by item name, buyer/seller, date range, price range, game, transaction type, currency, CS2 item type, collection, StatTrak, Souvenir, or custom filter groups. Every query runs as optimized SQL — instant results even on massive datasets. Save your favorite filter combinations for one-click access later. Optional performance indexes speed up filtered queries and pagination by ~4x with only 5–10% increase in database size. 📊 12 INTERACTIVE CHARTS — TABBED DASHBOARD Charts are organized into 3 tabs — Financial Overview, Items & Games, and Activity & Comparison — with lazy loading per tab: Financial Overview: Purchases vs Sales over time Cumulative Profit/Loss tracking Monthly Summary with buy/sell split Price Distribution histogram Spending Trend with 3-month moving average Items & Games: Top Items breakdown Top Games breakdown Game Breakdown with year filter Activity & Comparison: Activity Heatmap — day-of-week × hour-of-day patterns Day of Week distribution (filterable by year and month) Hour of Day distribution (filterable by year and month) Year-over-Year comparison — overlay monthly data across years with spending/earnings/transaction count selector All charts support per-currency toggle for multi-currency traders. 📤 FULL EXPORT CONTROL CSV or JSON with a column picker — choose exactly which of the 13 available columns to include. File size estimation before export so you know what to expect. Chunked processing for massive datasets — no browser freezing, and cancellable mid-export. Dates formatted in your locale. 🔗 LISTING PAGE INTEGRATION Visit any item's market page on Steam and see your complete buy/sell history for that item injected directly into the page. Per-item summary with buy/sell totals broken down by currency. Click any price to see the full fee breakdown (Steam Fee + Publisher Fee + net amount). CS2 items get an Inspect in Game overlay on hover. 🛠️ DIAGNOSTICS & REPAIR A full diagnostic suite for power users — no other market history extension offers this: Database health overview with row counts and coverage percentage Fill Gaps — automatically detect and re-fetch missing transactions Rebuild Database — recover data from a corrupted database by batch-reading Vacuum — reindex and reclaim unused disk space Performance index sizes visible in the diagnostics dashboard Real-time action log for all diagnostic operations 👥 MULTI-ACCOUNT SUPPORT Automatically detects Steam account switches. Each account gets isolated data, independent sync settings, and separate notification preferences. Quick account switcher in the popup — no manual configuration needed. 💾 FULL DATABASE BACKUP & RESTORE Stream-download your entire SQLite database — handles files well over 1.5 GB without loading into memory. Restore from any backup with automatic account reconciliation. Your data is always portable. 🔒 ZERO DATA COLLECTION No analytics. No telemetry. No external requests except to Steam for your own transaction data. No sign-up, no cloud sync, no servers. Everything stays in your browser's local storage. Your SQLite database is yours — backup it, inspect it, migrate it however you want. ⚡ BUILT FOR THE MODERN WEB Chrome Manifest V3. SQLite with WAL journal mode on a dedicated Web Worker — database operations never block the UI. Optimized indexes across all filter dimensions. Optional composite indexes for power users who want even faster queries. Streaming backup and restore with no file size limits. 🌐 11 Languages English, Türkçe, Русский, 中文 (简体), Français, Deutsch, Español, Português (Brasil), Polski, 日本語, 한국어 Language is auto-detected from your Steam profile or set manually.