feat: rewrite repositories with base entity repository class.

feat: sales and purchases status.
feat: sales and purchases auto-increment number.
fix: settings find query with extra columns.

server/src/exceptions/ModelEntityNotFound.ts

@@ -0,0 +1,8 @@
+
+export default class ModelEntityNotFound extends Error {
+
+  constructor(entityId, message?) {
+    message = message || `Entity with id ${entityId} does not exist`;
+    super(message);
+  }
+}