Persist learn progress per user

server/models/LearnProfile.ts

@@ -0,0 +1,34 @@
+import mongoose from 'mongoose'
+import type { LearnConfig, LearnProgress } from '~~/shared/learn/config'
+
+export interface LearnProfileDocument extends mongoose.Document {
+  user: mongoose.Types.ObjectId
+  xp: number
+  progress: LearnProgress
+  config: LearnConfig
+  createdAt: Date
+  updatedAt: Date
+}
+
+const learnProfileSchema = new mongoose.Schema<LearnProfileDocument>(
+  {
+    user: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true, unique: true },
+    xp: { type: Number, default: 0 },
+    progress: { type: mongoose.Schema.Types.Mixed, default: () => ({}) },
+    config: {
+      tts: { type: Boolean, default: false },
+      radioLevel: { type: Number, default: 4, min: 1, max: 5 },
+      voice: { type: String, default: '', trim: true },
+      audioChallenge: { type: Boolean, default: false },
+    },
+  },
+  {
+    timestamps: true,
+  },
+)
+
+learnProfileSchema.index({ user: 1 }, { unique: true })
+
+export const LearnProfile =
+  (mongoose.models.LearnProfile as mongoose.Model<LearnProfileDocument> | undefined) ||
+  mongoose.model<LearnProfileDocument>('LearnProfile', learnProfileSchema)