update README with prerequisites and add dataset_id column to thread table in migrations

Author: mosoriob

README.md

@@ -4,19 +4,18 @@ This repository contains the schema and metadata of the MINT GraphQL.
 
 ## How to run?
 
-### Prerequisites  
+### Prerequisites
 
 1. Install the [Hasura CLI](https://hasura.io/docs/latest/migrations-metadata-seeds/migrations-metadata-setup/#step-1-install-the-hasura-cli)
 2. Install MINT using Helm chart
 
 ### Run
 
-
-
 Apply the metadata to the MINT GraphQL
 
 ```bash
 $ export HASURA_GRAPHQL_ADMIN_SECRET=<admin-secret>
+$ export HASURA_GRAPHQL_ENDPOINT=http://localhost:8080
 $ hasura migrate apply
 $ hasura metadata apply
 ```
@@ -26,4 +25,3 @@ Populate the database with the seed data
 ```bash
 $ hasura seeds apply
 ```
-

migrations/1751375338869_add_dataset_id_subtask/down.sql

@@ -0,0 +1,6 @@
+ALTER TABLE thread
+ADD COLUMN dataset_id text;
+
+-- down.sql
+ALTER TABLE thread
+DROP COLUMN dataset_id;