diff --git a/backend/migrations/004_add_auth_columns.sql b/backend/migrations/004_add_auth_columns.sql
new file mode 100644
index 0000000..b799b56
--- /dev/null
+++ b/backend/migrations/004_add_auth_columns.sql
@@ -0,0 +1,13 @@
+-- Migration 004: Add missing auth columns to profiles table
+-- Adds columns needed for email verification and trial system
+
+ALTER TABLE profiles
+ADD COLUMN IF NOT EXISTS auth_type VARCHAR(50) DEFAULT 'email',
+ADD COLUMN IF NOT EXISTS verification_expires TIMESTAMP,
+ADD COLUMN IF NOT EXISTS trial_ends_at TIMESTAMP;
+
+-- Update existing profiles to have default values
+UPDATE profiles
+SET auth_type = 'email',
+    email_verified = true  -- existing profiles are considered verified
+WHERE auth_type IS NULL;