WIP Added model, migration and bulk upsert fnc.

app/helpers/db/priceHistory.js

@@ -7,7 +7,8 @@ const bulkUpsertPriceHistory = async priceHistoryData => {
     const order = [["realEstateId", "desc"]];
 
     return await db.PriceHistory.bulkCreate(priceHistoryData, {
-      order
+      order,
+      ignoreDuplicates: true
     });
   } catch (e) {
     console.log("Error bulk upserting priceHistory : ", e);