-- Migration: Add has_write_access column to users table
-- Run this as a PostgreSQL superuser or with appropriate permissions

-- Add the has_write_access column with default false
ALTER TABLE users 
ADD COLUMN IF NOT EXISTS has_write_access BOOLEAN NOT NULL DEFAULT false;

-- Create an index on has_write_access for faster queries
CREATE INDEX IF NOT EXISTS idx_users_has_write_access ON users(has_write_access);

-- Update existing users: only admins should have write access initially
-- (You may want to adjust this based on your needs)
UPDATE users 
SET has_write_access = false 
WHERE has_write_access IS NULL;

-- Verify the column was added
SELECT column_name, data_type, column_default 
FROM information_schema.columns 
WHERE table_name = 'users' AND column_name = 'has_write_access';