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Products that do what I've built a MySQL proxy that supports online DDL does
Hi everyone. Over the past year, I've built a MySQL Proxy that supports Online DDL. I'm not sure if there are other proxies out there with this feature, but I found it fascinating and thought it was worth sharing. Of course, this proxy also supports many other features, such as Read Write Split, Read After Write Consistency, Load Balancing, and Transparent Failover. I didn't build this database from the bottom up; instead, I forked Vitess and put a lot of effort into overhauling its architecture and SQL Engine Layer. Moving forward, I hope to introduce more developer-friendly features into…
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sql-tap is a transparent proxy that captures SQL queries by parsing the PostgreSQL/MySQL wire protocol and displays them in a terminal UI. You can run EXPLAIN on any captured query. No application code changes needed — just change the port.
Feb 2026 · github.com
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2016 · upscaledb.com
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2019 · pugsql.org
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2016 · github.com
- 5TA
I built a SQLite VFS in Rust that serves cold queries directly from S3 with sub-second performance, and often much faster. It’s called turbolite. It is experimental, buggy, and may corrupt data. I would not trust it with anything important yet. I wanted to explore whether object storage has gotten fast enough to support embedded databases over cloud storage. Filesystems reward tiny random reads and in-place mutation. S3 rewards fewer requests, bigger transfers, immutable objects, and aggressively parallel operations where bandwidth is often the real constraint. This was explicitly inspired…
Mar 2026 · github.com
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Hi HN - I'm Venkat, founder of Stayflexi (YC), CMU CS grad and Ex-Oracle Query Engine team (patents in core databases) DeepSQL started as an internal tool to stop our own databases from becoming the bottleneck they were becoming (13,000+ hotels in production). It worked well enough that we're releasing it. DeepSQL is an AI agent that operates a database the way a senior DBA and Data Engineer would 1. Fixes slow queries (we cutdown DB spend by 4x) 2. Fixes DB bloat (blocks unnecessary schema changes, in vibecoded setup) 2. BI dashboards(we removed spend on tableau, retool and appsmith) 3.…
Jul 2026 · deepsql.ai
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I built DDL to Data after repeatedly pushing back on "just use production data and mask it" requests. Teams needed populated databases for testing, but pulling prod meant security reviews, PII scrubbing, and DevOps tickets. Hand-written seed scripts were the alternative slow, fragile, and out of sync the moment schemas changed. Paste your CREATE TABLE statements, get realistic test data back. It parses your schema, preserves foreign key relationships, and generates data that looks real, emails look like emails, timestamps are reasonable, uniqueness constraints are honored. No setup, no…
Jan 2026
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Hello HN! I'm building mvsqlite, a distributed variant of SQLite with MVCC transactions, that runs on FoundationDB. It is a drop-in replacement that just needs an `LD_PRELOAD` for existing applications using SQLite. I made this because Blueboat (https://github.com/losfair/blueboat) needs a native SQL interface to persistent data. Apparently, just providing a transactional key-value store isn’t enough - it is more easy and efficient to build complex business logic on an SQL database, and it seems necessary to bring a self-hostable distributed SQL DB onto the platform.…
2022 · github.com
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LinkedQL is a new SQL client that supports live queries over any Postgres, MySQL, and MariaDB database. You get result sets that self-update differentially as rows change in your database – via inserts, updates, deletes. Works with no extra tooling/ORM layer or GraphQL servers. You opt into live mode simply with a flag: client.query('SELECT ...', { live: true }). More at: https://linked-ql.netlify.app/capabilities/live-queries LinkedQL is written in JavaScript and runs in both client and server environments. GitHub + docs:…
Dec 2025 · github.com
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I built this web-based developer utility few years ago when I couldn't find any opensource GUI-based query builder for mysql (similar to what MS Access had). This app can be run locally. The online demo uses static hardcoded values. Screencast's link is included in the README file.
2023 · codeberg.org
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Hello everyone! I'm exited to share a NodeJS package I was working on for the past two months. The package is designed to simplify querying SQL databases through an array-like API. Qustar supports PostgreSQL, SQLite, MySQL, and MariaDB, and offers TypeScript support for a robust development experience. It's in early stage of development. I would like to hear your thoughts about it.
2024 · github.com
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I've always been curious about how SQL engines actually work. So I built a minimum viable SQL engine in Go. - Supports CSV files as tables - Supports SELECT, FROM, WHERE, LIMIT It's very simple: 1. Parses query string 2. Converts it into an AST representation 3. Executes the query against the CSV 4. Returns the results
2024 · github.com
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INSTALL EXTENSION vsql-complex; CREATE TABLE t (val COMPLEX); Look, MySQL is awesome [flamewar incoming?]. But the ecosystem has stagnated. Why? No permissionless innovation. Postgres has flourished because people can change the core of the database (look at pgvector and pg_textsearch), without having to get their changes accepted upstream. (This, btw, is what powered GitHub's early success: you can fork a repo and make changes without needing the owners' approval) VillageSQL is a tracking fork of MySQL (open source, ofc) that adds an extension framework: * Drop-in replacement * Add custom…
Feb 2026 · github.com
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Hey HN! We’re Emma and Chris, founders of Velvet (https://www.usevelvet.com). Velvet proxies OpenAI calls and stores the requests and responses in your PostgreSQL database. That way, you can analyze logs with SQL (instead of a clunky UI). You can also set headers to add caching and metadata (for analysis). Backstory: We started by building some more general AI data tools (like a text-to-SQL editor). We were frustrated by the lack of basic LLM infrastructure, so ended up pivoting to focus on the tooling we wanted. So many existing apps, like Helicone, were hard to use as power…
2024 · usevelvet.com
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Hi HN, I’m Tullie, founder of Shaped. Previously, I was a researcher at Meta AI, worked on ranking for Instagram Reels, and was a contributor to PyTorch Lightning. We built ShapedQL because we noticed that while retrieval (finding 1,000 items) has been commoditized by vector DBs, ranking (finding the best 10 items) is still an infrastructure problem. To build a decent for you feed or a RAG system with long-term memory, you usually have to put together a vector DB (Pinecone/Milvus), a feature store (Redis), an inference service, and thousands of lines of Python to handle business logic…
Jan 2026 · playground.shaped.ai
- 18VP
# TL;DR We built VeilStream, a drop-in, read-only PostgreSQL proxy that strips, masks, or anonymizes sensitive values as queries stream through. In less than two minutes, you can put a proxy in front of a PostgreSQL database, whether hosted on your laptop, Neon, Supabase, or a cloud provider, and the user is able to start configuring filter rules. The use cases we're trying to solve are: - Production-like data in development environments - Improve incident handling by masking all data that is not relevant - Share a subset of your data - Protecting data being shipped into a data lake - Safe…
2025 · app.veilstream.com
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Hi HN, I'm Dean, the non-technical co-founder of SchemafreeSQL. We released our beta version about a year ago. You can see the HN Post here https://news.ycombinator.com/item?id=30291592 Today I am pleased to announce our initial release of our hosted SFSQL offering. A major concern from the HN Beta feedback we received was our longevity. Being a hosted database solution I can see why. We took that to heart and re-engineered our offering. We de-risked it by minimizing the amount of infrastructure under our management, fly.io manages customer's dedicated SFSQL endpoints,…
2023 · schemafreesql.com
- 20MC
I have just completed the MySQL parser that will be soon used in MIST. The story behind is that TiDB MySQL parser, which is by far the most MySQL compatible parser, was depending on some types called "parser_driver". Parser Driver contains types from TiDB, but unfortunately, TiDB is not going to moving MySQL types, which is heavy entangled with TiDB, out as a independent Go package. GitHub issue:16381 To me, TiDB itself is mixing all its open-sourced modules as a very opinionated monolith. I was porting MIST to WASM binary and TiDB syscalls will be stupidly included, compiled, and making…
2025 · abbychau.github.io
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Hello HN! We're excited to announce MyDuck Server, an open-source project that seamlessly integrates the analytical power of DuckDB with your existing MySQL & Postgres databases. *Backstory* Currently, there are no fully satisfactory open-source OLAP solutions for MySQL & Postgres. In the MySQL ecosystem, HeatWave offers close integration, but it's a proprietary, commercial product from Oracle. The Postgres community has seen promising DuckDB-based extensions emerge, including the official pg_duckdb. However, extensions can introduce isolation concerns in mission-critical environments.…
2024 · github.com
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Search a 100,000-article ParqDB index directly in the browser with MiniLM, HTTP Range, Parquet, and WebAssembly.
17d ago · search.parqdb.io
- 23VA
We built VillageSQL because we love MySQL, but we’ve watched the ecosystem stagnate while PostgreSQL flourished with extensions like pgvector and pg_textsearch. We wanted to give MySQL that same extensibility so teams don’t have to migrate databases just to keep building nowadays. VillageSQL is an open-source, tracking fork of MySQL that is a drop-in replacement and adds a true extension framework. How it works: +It’s a drop-in replacement +We added an interface to load external shared libraries (.so files) as extensions. +You define custom data types and functions (with indexes coming soon)…
Feb 2026 · villagesql.com
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xsql is an open-source Rust CLI + TUI for converting SQL schema DDL between database dialects. Instead of text-based rewrites, it parses CREATE TABLE statements into a small intermediate representation (IR), then emits equivalent SQL for the target dialect. This makes conversions safer, testable, and easier to extend. It supports single-file and recursive folder conversion, includes a no-typing interactive TUI, and recently added an experimental IR v2 with constraint support and JSON output for CI and tooling use. Feedback is very welcome, especially on schema portability and IR design.
Dec 2025 · github.com
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