Add models

Author: hernandosebastian

src/models/index.ts

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+export { default as ItemModel } from "./item.model";
+export type { ItemDTO } from "./item.interface";

src/models/item.interface.ts

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+export interface ItemDTO {
+  name: string;
+  description?: string;
+}
+
+export default ItemDTO;

src/models/item.model.ts

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+import dynamoose from "dynamoose";
+import { itemSchema } from "../schemas";
+
+const ddb = new dynamoose.aws.ddb.DynamoDB({
+  endpoint: process.env.DYNAMO_ENDPOINT,
+  region: process.env.DYNAMO_REGION,
+});
+
+dynamoose.aws.ddb.set(ddb);
+
+const ItemModel = dynamoose.model("ItemsTable", itemSchema);
+
+export default ItemModel;