Mehrab R.

duckcall — a pure-Go client for Quack Speak Quack without CGO or an embedded DuckDB instance so your Go services and cron jobs can query a central quack_serve from a cross-compiled binary.

dimport _ "github.com/mehrabr/duckcall/driver"

db, _ := sql.Open("duckcall", "quack://analytics.internal:8888?token=env:QUACK_TOKEN")
rows, _ := db.QueryContext(ctx, "SELECT product, sum(total) FROM sales GROUP BY 1")

Tier-1 scalars ship now, verified against a live DuckDB 1.5.4 server: the tests re-encode a captured wire corpus byte for byte. Read-only, beta protocol, breaks when upstream breaks. github.com/mehrabr/duckcall

I've been studying agents and getting into the weeds with evals. So finished a project to help walk myself through some challenges. text-to-sql is a solved demo where the hard part is teaching the agent to refuse. I built an agent over DuckDB that verifies its own SQL and declines when the schema can’t answer (so no inventing an email column), and a 64-question eval harness that scores “correctly declined” as its own metric, separate from accuracy. Used DuckDB’s native TPC-H to make the whole thing one-line reproducible. Repo + writeup below. FYI: the headline number is the harness validating itself, not a model just yet! repo: https://github.com/mehrabr/agentic-duckdb-analyst write up: https://mehrabr.com/engineering/2026/06/20/text-to-sql-is-a-solved-demo.html

Been playing around with some dive ideas, and sadly there's a limit to the number we can submit! Check out some of these that didn't make it: https://app.motherduck.com/dives/there-and-back-again-fd4e1daf-d4b6-4cd4-816a-2ce0eae0b84d/presentation?s=62aa0a70 https://app.motherduck.com/dives/thirty-years-of-bets-00213d50-2301-4c30-95a0-d4f9c1e02de6/presentation?s=19c9150a https://app.motherduck.com/dives/the-world-from-your-airport-09d39918-8434-496f-a7c1-c25e1d8afb6c/presentation?s=22d5db76 https://app.motherduck.com/dives/kindling-for-mass-war-bb5fa6ff-af46-485d-9ef7-044413d6304f/presentation?s=497d3372 And my latest submission to the gallery (I love SimCity 2000): https://motherduck.com/dive-gallery/dives/the-bay-builds-out-not-up

Back with a new Dive but the same recurring issue. When trying to publish my 'Kindling for Mass War' dive I followed through with my Claude prompts, it shared my database, and when I tried to submit it said: "Make these databases public to continue mass_war Org only Owned by someone else — ask them to make it public. After altering the share from Anyone in my org to Anyone with the share link, I got the old error message from my last issue: We couldn’t validate this dive’s databases for public sharing. Make sure each database is an unrestricted (public) share you can access, then try again. I tried downgrading to the Free tier plan (was almost done with my trial anyway) but no change. Could feasibly push data to hard coded like before but I think there must be a solution.

After wrestling with Claude and my first Dive account, I finally have one to submit! https://motherduck.com/dive-gallery/dives/the-salmon-run-columbia-basin-migration-atlas/ Big thanks to Tia for her help debugging. I think I have one more submission in me now that I have a handle on things. Anyway, this was an attempt to create a Minard-style chart that Tufte called the greatest ever, but instead of Napoleon's march on Moscow I used salmon swimming upstream to spawn.