Persistent User Traits

Set user traits once via identify() and they are automatically forwarded with every subsequent event in context.traits.

client.identify('user-123', { plan: 'pro', country: 'US' });

// All subsequent events include context.traits = { plan: 'pro', country: 'US' }
client.capture('button_clicked', { buttonId: 'cta' });

Sensitive keys (email, password, phone, etc.) are stripped before traits are persisted. Traits survive app restarts. Call client.reset() to clear them.

See PII sanitization.