Node — Set person properties
Set or update user properties from the server withsetPersonProperties (overwrites) or setPersonPropertiesOnce (only if not already set). Pass sessionId and windowId when correlating with the client session.
setPersonProperties(distinctId, properties, sessionId?, windowId?)
Sets user properties (overwrites). Sends$set event.
When to use: Update user properties without sending an
$identify event (e.g. when properties change after initial identification).
setPersonPropertiesOnce(distinctId, properties, sessionId?, windowId?)
Sets user properties only if not already set. Sends$set_once event.
When to use: One-time attributes that shouldn’t be overwritten (e.g.
signupSource, firstPurchaseDate).