WIP Added model, migration and bulk upsert fnc.

app/crawler/savers/postgres.js

@@ -14,9 +14,16 @@ class PostgresSaver {
     const savedRecords = await bulkUpsertRealEstates(results);
     //Extruding data for price history table
     const resultPrices = savedRecords.map(realEstate => {
+      //Null values canot be recognized by ignore duplicates in sequalize
+      //Value price = 0 indicates 'cijena na upit'
+      const priceTmp =
+        realEstate.dataValues.price === null ? 0 : realEstate.dataValues.price;
+
       return {
         realEstateId: realEstate.dataValues.id,
-        price: realEstate.dataValues.price
+        price: priceTmp,
+        createdAt: realEstate.dataValues.createdAt,
+        updatedAt: realEstate.dataValues.updatedAt
       };
     });
     const savedPrices = await bulkUpsertPriceHistory(resultPrices);