feat: add history tracking

src/lib/history.mjs

@@ -0,0 +1,30 @@
+import fs from 'fs';
+import path from 'path';
+
+export default class History {
+  constructor() {
+    this.filePath = path.resolve('data', 'history.json');
+    try {
+      const data = fs.readFileSync(this.filePath);
+      this.db = data.length === 0 ? [] : JSON.parse(data);
+    } catch (e) {
+      this.db = [];
+    }
+  }
+
+  get(id) {
+    return this.db.find(doc => parseInt(doc.id, 10) === parseInt(id, 10));
+  }
+
+  add(doc) {
+    // prevent duplicate entries
+    if (this.get(doc.id)) return;
+
+    // add doc to history, truncate as needed
+    this.db.push(doc);
+    if (this.db.length > 1000) this.db.splice(0, 1000);
+
+    // write the updated content to the file
+    fs.writeFileSync(this.filePath, JSON.stringify(this.db), { encoding: 'utf8' });
+  }
+}