Arthur Sepiol a902a87c08 feat: implement identity stitching for session linking (#3820) ... Adds automatic session linking/identity stitching to link anonymous browsing sessions with authenticated user sessions. ## Changes ### Database Schema - Add `identity_link` table (PostgreSQL + ClickHouse) to store mappings between visitor IDs and authenticated user IDs - Add `visitor_id` field to `Session` model - Add `visitor_id` column to ClickHouse `website_event` table ### Client Tracker - Generate and persist `visitor_id` in localStorage - Include `vid` in all tracking payloads - Support opt-out via `data-identity-stitching="false"` attribute ### API - Accept `vid` parameter in `/api/send` endpoint - Auto-create identity links when `identify()` is called with both visitor_id and distinct_id - Store visitor_id in sessions and events ### Query Updates - Update `getWebsiteStats` to deduplicate visitors by resolved identity - Visitors who browse anonymously then log in are now counted as one user ## Usage When a user logs in, call `umami.identify(userId)`. If identity stitching is enabled (default), the tracker automatically links the anonymous visitor_id to the authenticated userId. Stats queries then resolve linked identities to accurately count unique visitors. Resolves #3820		2025-12-03 16:06:54 +03:00
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migrations	clean up funnel migration and report errors	2025-09-10 16:38:51 -07:00
schema.prisma	feat: implement identity stitching for session linking (#3820)	2025-12-03 16:06:54 +03:00