Failed to create postgres pool using Supabase Postgres

[sghofrany]

I am attempting to use Supabase as my postgresql database with PostGIS. Here is the command I am running to try and connect:

martin postgresql://postgres:password@db.databaseid.supabase.co:5432/postgres

Here is the error I am getting:

  2026-03-20T15:32:02.600146Z ERROR martin: Failed to create postgres pool: Unable to get a Postgres connection from the pool postgres: Error occurred while creating a new object: error connecting to server
    at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/martin-1.4.0/src/bin/martin.rs:80

I've tried escaping the @ symbol using %40 like so:

martin postgresql://postgres:password%40db.databaseid.supabase.co:5432/postgres

And I get the following error:

  2026-03-20T15:37:42.904771Z ERROR martin: Failed to create postgres pool: Unable to parse connection string postgresql://postgres:shayanghofrany%40db.kjvxpeirxffwwwfpejsp.supabase.co:5432/postgres: invalid connection string
    at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/martin-1.4.0/src/bin/martin.rs:80

I am able to connect to the database using my JetBrains IDE, so I believe the issue is with either how I'm passing in the connection_string or possibly how martin handles connections.

[CommanderStorm]

This smells much more like a connection string / networking issue than a Martin bug.

can you connect using psql via the exact same string you use for martin?

Maybe it is the port, maybe ?sslmode=require, not sure.

[sghofrany]

I've also tried with the ssl flag. I'll try psql when I get back on my computer and update this thread.

[sghofrany]

I figured out the issue.

For future reference, Supabase direct connect uses IPv6 and I guess Martin or something during the connection process doesn't like that. I ended up using the session pooler supabase provides as that uses IPv4.

[CommanderStorm]

Let me guess: have you configured docker to have ipv6 support?

[sghofrany]

I'm not using docker atm, just running locally on my own device.

[CommanderStorm]

(transfered to a discussion since I don't know if this is an actual issue with us or just or if it can be improved)