-- Migration: Make name column required (NOT NULL) in users table
-- Run this as a PostgreSQL superuser or with appropriate permissions
-- Prerequisites: All existing users must have a non-null name value

-- First, ensure all existing users have a name (safety check)
-- This should not update any rows if all users already have names
UPDATE users 
SET name = email 
WHERE name IS NULL;

-- Alter the column to be NOT NULL
ALTER TABLE users 
ALTER COLUMN name SET NOT NULL;

-- Verify the column constraint
SELECT column_name, data_type, is_nullable, column_default 
FROM information_schema.columns 
WHERE table_name = 'users' AND column_name = 'name';