new selfhosted version

dashboard/server/api/data/event_user_flow.ts

@@ -0,0 +1,85 @@
+import { EventModel } from "~/shared/schema/metrics/EventSchema";
+
+
+export default defineEventHandler(async event => {
+
+    const { event_name } = getQuery(event);
+
+    if (!event_name || typeof event_name !== 'string') throw createError({ status: 400, message: 'event_name is required' });
+
+    const ctx = await getRequestContext(event, 'pid', 'domain', 'range', 'permission:webAnalytics');
+    const { project_id, domain, from, to } = ctx;
+
+      const websiteMatch = domain ? { website: domain } : {};
+
+    const aggregation = [
+        {
+            $match: {
+                project_id,
+                created_at: {
+                    $gte: new Date(from),
+                    $lte: new Date(to)
+                },
+                name: event_name,
+                ...websiteMatch
+            }
+        },
+        {
+            $project: {
+                _id: "$name",
+                flowHash: 1
+            }
+        },
+        {
+            $lookup: {
+                from: "visits",
+                let: {
+                    flowHash: "$flowHash"
+                },
+                pipeline: [
+                    {
+                        $match: {
+                            $expr: {
+                                $and: [
+                                    {
+                                        $eq: [
+                                            "$project_id", project_id
+                                        ]
+                                    },
+                                    {
+                                        $eq: ["$flowHash", "$$flowHash"]
+                                    }
+                                ]
+                            }
+                        }
+                    },
+                    {
+                        $project: {
+                            _id: 0,
+                            referrer: 1
+                        }
+                    }
+                ],
+                as: "visitInfo"
+            }
+        },
+        {
+            $unwind: "$visitInfo"
+        },
+        {
+            $group: {
+                _id: "$visitInfo.referrer",
+                count: {
+                    $sum: 1
+                }
+            }
+        }
+    ]
+
+
+
+    const result = await EventModel.aggregate(aggregation);
+
+    return result as { _id: string, count: number }[];
+
+});