Feat/um 305 unique session ch (#2065)

* Add session_data / session redis to CH.

* Add mysql migration.

lib/dynamicData.ts

@@ -0,0 +1,75 @@
+import { isValid, parseISO } from 'date-fns';
+import { DYNAMIC_DATA_TYPE } from './constants';
+import { DynamicDataType } from './types';
+
+export function flattenJSON(
+  eventData: { [key: string]: any },
+  keyValues: { key: string; value: any; dynamicDataType: DynamicDataType }[] = [],
+  parentKey = '',
+): { key: string; value: any; dynamicDataType: DynamicDataType }[] {
+  return Object.keys(eventData).reduce(
+    (acc, key) => {
+      const value = eventData[key];
+      const type = typeof eventData[key];
+
+      // nested object
+      if (value && type === 'object' && !Array.isArray(value) && !isValid(value)) {
+        flattenJSON(value, acc.keyValues, getKeyName(key, parentKey));
+      } else {
+        createKey(getKeyName(key, parentKey), value, acc);
+      }
+
+      return acc;
+    },
+    { keyValues, parentKey },
+  ).keyValues;
+}
+
+export function getDynamicDataType(value: any): string {
+  let type: string = typeof value;
+
+  if ((type === 'string' && isValid(value)) || isValid(parseISO(value))) {
+    type = 'date';
+  }
+
+  return type;
+}
+
+function createKey(key, value, acc: { keyValues: any[]; parentKey: string }) {
+  const type = getDynamicDataType(value);
+
+  let dynamicDataType = null;
+
+  switch (type) {
+    case 'number':
+      dynamicDataType = DYNAMIC_DATA_TYPE.number;
+      break;
+    case 'string':
+      dynamicDataType = DYNAMIC_DATA_TYPE.string;
+      break;
+    case 'boolean':
+      dynamicDataType = DYNAMIC_DATA_TYPE.boolean;
+      value = value ? 'true' : 'false';
+      break;
+    case 'date':
+      dynamicDataType = DYNAMIC_DATA_TYPE.date;
+      break;
+    case 'object':
+      dynamicDataType = DYNAMIC_DATA_TYPE.array;
+      value = JSON.stringify(value);
+      break;
+    default:
+      dynamicDataType = DYNAMIC_DATA_TYPE.string;
+      break;
+  }
+
+  acc.keyValues.push({ key, value, dynamicDataType });
+}
+
+function getKeyName(key, parentKey) {
+  if (!parentKey) {
+    return key;
+  }
+
+  return `${parentKey}.${key}`;
+}