feat: create activites model

src/common/enums/activity-type.enum.ts

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+export enum ActivityType {}

src/common/models/activity.model.ts

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+import mongoose, { Types } from "mongoose";
+import { MealDocument } from "./meal.model";
+import { MealPlanDocument } from "./meal-plan.model";
+import { WorkoutDocument } from "./workout.model";
+import { ExerciseDocument } from "./exercise.model";
+import { ActivityType } from "@common/enums/activity-type.enum";
+const { Schema } = mongoose;
+//related_item
+//meta_data
+//activity type
+//related id
+//user id
+//created_//at
+//
+
+export type RelatedItem = MealDocument | MealPlanDocument | WorkoutDocument | ExerciseDocument;
+export type AMetaData = {};
+
+export interface IActivity {
+  related_item?: RelatedItem;
+  meta_data: AMetaData;
+  activity_type: ActivityType;
+  related_id: string | Types.ObjectId;
+  user_id: string | Types.ObjectId;
+  created_at: Date;
+}
+
+const activitySchema = new Schema({
+  related_item: {
+    type: Schema.Types.Mixed,
+    required: false,
+  },
+  meta_data: {
+    type: Schema.Types.Mixed,
+    default: {},
+  },
+  activity_type: {
+    type: String,
+    enum: Object.values(ActivityType),
+  },
+  related_id: {
+    type: Schema.Types.ObjectId,
+    required: true,
+  },
+  user_id: {
+    type: Schema.Types.ObjectId,
+    required: true,
+  },
+  created_at: {
+    type: Date,
+    default: Date.now,
+  },
+});
+
+export type ActivityDocument = IActivity & mongoose.Document;
+
+export const Activity = mongoose.model<ActivityDocument>(
+  "activities",
+  activitySchema
+);