add migration for settings doc

server/db/models/AppSettings.js

@@ -34,6 +34,10 @@ const AppSettingsSchema = mongoose.Schema(
 			unique: true,
 			default: true,
 		},
+		version: {
+			type: Number,
+			default: 1,
+		},
 	},
 	{
 		timestamps: true,

server/service/settingsService.js

@@ -59,6 +59,9 @@ class SettingsService {
 	}
 
 	async getDBSettings() {
+		// Remove any old settings
+		await this.appSettings.deleteMany({ version: { $exists: false } });
+
 		let settings = await this.appSettings
 			.findOne({ singleton: true })
 			.select("-__v -_id -createdAt -updatedAt -singleton")