Show HN: Pgclaw – A "Clawdbot" in every row with 400 lines of Postgres SQL

35 points by calebhwin 5 hours ago

Hi HN,

Been hacking on a simple way to run agents entirely inside of a Postgres database, "an agent per row".

Things you could build with this: * Your own agent orchestrator * A personal assistant with time travel * (more things I can't think of yet)

Not quite there yet but thought I'd share it in its current state.

maxbond - 3 hours ago

What's the advantage in putting agents in the persistence layer rather than the application layer? This seems to me strictly less flexible, scalable, secure, easy to work with... I am having a hard time imagining why I would want to integrate with APIs or write an agentic harness in the database rather than in application code?

Maybe I'm behind the times but I don't understand.

4ndrewl - 3 hours ago

It's similar to when we wrote all our business logic in eg pl/sql, stored procedures etc. Seems attractive at first, but it breaks separation of concerns, becomes difficult to test etc.
- thatwasunusual - 2 hours ago
  
  > It's similar to when we wrote all our business logic in eg pl/sql [...]
  What do you mean with "when"? /s
  I dread companies who still have logic in their databases when it's not necessary. <insert sad face>

tibbar - 4 hours ago

This is mind-bending. I can't imagine that it performs well enough to be particularly fit for production just yet but..... wow.

swyx - 3 hours ago

how exactly is adding a stored procedure as an agent mind bending
- tibbar - 2 hours ago
  
  I can only speak for my own mind ;) but the most advanced thing I'd seen prior in this regard was Google Sheets' =AI function, which is pretty convenient (if awkward) when you want to map values to LLM output.
  What I specifically found "mind-bending" about this is that I don't have a clear concept of the limits of what an agent can do. In the limit case, it's basically like an independent employee, right?. So the concept of having a dedicated person sitting on each row of my database and transactionally performing any task I can describe is ... well, it IS a bit boggling to me.
  Another way to look at it is: this is an extremely powerful construct for managing fleets of agents. I trust Postgres to execute all the stored procedures I ask it to. So with this tool I can easily spin up arbitrarily many agents. And state management is very simple, because they can directly edit their associated row!
  IDK, the more I think about it the more fascinated I am. I'm sure there is some open source SAAS or something that has similar semantics and can do all this more efficiently, but now I know that this is a category of thing one could potentially build/use. Pretty nifty!
  - renato_shira - 14 minutes ago
    
    the "agent per row" framing is what makes this click for me too. most agent frameworks think in terms of orchestration graphs or message queues, but modeling it as "each row has a little worker that can act on its own state" is a surprisingly intuitive primitive.
    it also maps well to how a lot of real world problems actually work: you have N entities, each with their own context, and you want something watching each one independently. the traditional way to do that is a job queue polling the database, but if the database is the compute layer, you skip a whole class of sync/consistency problems.
    probably not production ready for anything serious, but i've seen this pattern before where "weird" database experiments end up influencing real tools later. json columns were an antipattern until jsonb became a legitimate design choice. triggers were considered dangerous until supabase made realtime features out of them. the boundary keeps shifting.
  - swyx - 2 hours ago
    
    ok nice reply. i think i was where you were in 2021 around doing stuff in sprocs. i think pple generally follow a cycle of going overexcited about throwing everything in the database and then going "actually the database is a pretty bad production compute environment" and re-separating concerns back to different levels.
    use sprocs lightly for simple fast stateless things. every other attempt at stuffing a lot of compute into the database that i'm aware of has basically failed to gain adoption (the personal awesomeness/happiness of the guy who created it aside)
  - - 2 hours ago
    
    [deleted]

debugnik - 2 hours ago

I don't understand why claw is a data type for columns in these examples, it doesn't seem to store any actual per-row state. Is it not possible to hook extensions onto "with" clauses or something similar?

wwweston - 4 hours ago

This... does not seem like separation of concerns.

Not to mention that the data layer seems like the one where you want to keep things most deterministic.

nkmnz - an hour ago

If you really want to run an agent on each created row, you could run this in a replica and stream the replies back to your system of record.
noupdates - 3 hours ago

To decouple this the person would have to broadcast nearly every event and rebuild the observer layers elsewhere.
- nkmnz - an hour ago
  
  You could replicate and separate your llm-postgres from the system-of-record-postgres.
- thatwasunusual - 2 hours ago
  
  And IMO that's what should be done.
  Don't get me wrong, I like the idea and all that, but this is another pgsql "solution" that is tied to the database layer, when it should be in the application layer.
  I like to be database agnostic, and while I prefer PostgreSQL on production, I prefer SQLite on the dev layer. You should never have to HAVE TO use a specific database to make your APPLICATION work.

xnx - 3 hours ago

It feels like we're a week away from the Claw hype supplanting AI hype. Companies will start renaming things ClawX to get on the hype bandwagon.

maxbond - 3 hours ago

I think "claw" isn't appealing enough to be genericized and that "agent" will continue to be the generic term, but we'll see.
calebhwin - 3 hours ago

It's just an abstraction people are excited about at the moment. Langchain was an exciting abstraction at one point.
My bet is we converge on a super minimal model<>computer architecture.

ef2k - 2 hours ago

Nice. These are the kind of boundary pushing projects I like to see. It challenges assumptions of where application logic should live. The implications around cost, latency, and recovery are going to be interesting.

- 3 hours ago

[deleted]

readme - 4 hours ago

i love postgres and pgvector... this is exactly to my tastes

calebhwin - 4 hours ago

Same, it's in a similar vein as pgvector - probably not as performant as turbopuffer or chroma but you get the benefits of being in a really nice ecosystem.
- tibbar - 4 hours ago
  
  Is it? pgvector is primarily about indexing, I think? This feels more similar =AI in Google Sheets.
  - calebhwin - 3 hours ago
    
    True though pgvector is not deterministic in a strict sense since HNSW is probabilistic.
cpursley - 2 hours ago

Yes, and I imagine pgclaw would pair well with pgmq and pg_cron for scheduled work. Postgres really is enough: https://postgresisenough.dev
- maxbond - an hour ago
  
  Interesting to hear you say that, I was thinking (but hadn't said) that using WalEx to dispatch to some workers where the agent lived would be a better solution. The worker would then update the row (or more likely insert a new one in a different table with more constraints/different columns). I would be curious to hear what advantage you see in a `claw` type/`agent` column? I can't make heads or tails of it but I regard you as knowing a lot more about Postgres than me.

danr4 - 3 hours ago

this is fucking awesome

rel_ic - 2 hours ago

We need your help! Can you please use your creativity to build resilience to climate change in your community instead of experimenting with more ways to spend computing power?

- an hour ago

[deleted]
brunoqc - an hour ago

The solution is to tax the rich. But we won't.