create new crawler and Postgres saver

app/crawler/savers/postgres.js

@@ -1,8 +1,6 @@
-class PostgresSaver {
-  constructor(url) {
-    this.url = url;
-  }
+const { bulkUpsertRealEstates } = require("../../helpers/db/realEstate");
 
+class PostgresSaver {
   connect() {
     //TODO: It seems we never worry about open/close connection with Sequelize ?
     //TODO: Check if postgres is ready
@@ -10,13 +8,8 @@ class PostgresSaver {
   }
 
   async save(results) {
-    let resultsForMongo = Object.keys(results).map(key => {
-      return results[key];
-    });
-
-    for (const doc of resultsForMongo) {
-      this.collection.update({ url: doc.url }, doc, { upsert: true });
-    }
+    console.log("[POSTGRES] Saving...");
+    await bulkUpsertRealEstates(results);
   }
 
   close() {