WIP Added model and migration for new table priceHistory.

app/models/priceHistory.js

@@ -0,0 +1,35 @@
+"use strict";
+
+module.exports = (sequalize, DataTypes) => {
+  const PriceHistory = sequalize.define("PriceHistory", {
+    id: {
+      type: DataTypes.BIGINT,
+      autoIncrement: true,
+      primaryKey: true,
+      allowNull: false
+    },
+    realEstateId: {
+      type: DataTypes.BIGINT,
+      allowNull: false,
+
+      references: {
+        model: "RealEstate",
+        key: "id"
+      },
+      onUpdate: "CASCADE",
+      onDelete: "SET NULL"
+    },
+    price: DataTypes.REAL
+  });
+
+  PriceHistory.associate = models => {
+    PriceHistory.hasMany(models.RealEstate, {
+      foreignKey: "id",
+      sourceKey: "realEstateId",
+      targetKey: "id",
+      as: "realEstates"
+    });
+  };
+
+  return PriceHistory;
+};