User management

backend/migrations/002_update_users_auth.sql

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+-- Update users table for authentication system
+-- Add new columns and update existing ones
+
+-- First, add the new columns
+ALTER TABLE users 
+ADD COLUMN password_hash VARCHAR(255),
+ADD COLUMN is_admin BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- Update existing users to have a placeholder password hash
+-- (This is safe since there shouldn't be any real users yet)
+UPDATE users SET password_hash = '$2b$10$placeholder' WHERE password_hash IS NULL;
+
+-- Make password_hash required
+ALTER TABLE users ALTER COLUMN password_hash SET NOT NULL;
+
+-- Remove the old password column if it exists
+ALTER TABLE users DROP COLUMN IF EXISTS password;
+
+-- Create index on email for faster lookups
+CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
+
+-- Create index on is_admin for admin queries
+CREATE INDEX IF NOT EXISTS idx_users_is_admin ON users(is_admin);