New schema for pixels and links.

prisma/migrations/05_add_visit_id/migration.sql

@@ -0,0 +1,22 @@
+-- AlterTable
+ALTER TABLE "website_event" ADD COLUMN "visit_id" UUID NULL;
+
+UPDATE "website_event" we
+SET visit_id = a.uuid
+FROM (SELECT DISTINCT
+        s.session_id,
+        s.visit_time,
+        gen_random_uuid() uuid
+    FROM (SELECT DISTINCT session_id,
+            date_trunc('hour', created_at) visit_time
+        FROM "website_event") s) a
+WHERE we.session_id = a.session_id 
+    and date_trunc('hour', we.created_at) = a.visit_time;
+
+ALTER TABLE "website_event" ALTER COLUMN "visit_id" SET NOT NULL;
+
+-- CreateIndex
+CREATE INDEX "website_event_visit_id_idx" ON "website_event"("visit_id");
+
+-- CreateIndex
+CREATE INDEX "website_event_website_id_visit_id_created_at_idx" ON "website_event"("website_id", "visit_id", "created_at");