Initialize

.gitignore

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+node_modules/
+.env

server/model.js

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+const mongoose = require('mongoose');
+
+// Define Schemes
+const operationSchema = new mongoose.Schema({
+    keys: { type: String, required: true },
+    line: { type: Number, required: true },
+    column: { type: Number, required: true }
+});
+const snapshotSchema = new mongoose.Schema({
+    index: { type: Number, required: true },
+    timestamp: { type: Date, required: true },
+    user_id: { type: Number, required: true },
+    history_id: { type: Number, required: true },
+    operation: operationSchema
+});
+const historySchema = new mongoose.Schema({
+    children: [snapshotSchema]
+});
+
+/*
+this == model
+return Promise
+*/
+
+// Create new history document
+historySchema.statics.create = function(data) {
+    const history = new this(data);
+    return history.save();
+};
+
+// Find one history by history id
+historySchema.statics.findOneById = function(id) {
+    return this.findOne({id});
+}
+
+// Update history by id
+historySchema.statics.updateById = function(id, data) {
+    const history = this.findOneAndUpdate({id}, data, { new: true });
+    return history;
+}
+
+// Delete history by id
+historySchema.statics.deleteById = function(id) {
+    return this.remove({id});
+}
+
+// Create Model & Export
+module.exports = mongoose.model('History', historySchema);