refactoring API and added dbs: postgres, bolt

api/models/error_body.go

@@ -0,0 +1,11 @@
+package models
+
+type ErrorBody struct {
+	Fields  string `json:"fields,omitempty"`
+	Message string `json:"message,omitempty"`
+}
+
+// Validate validates this error body
+func (m *ErrorBody) Validate() error {
+	return nil
+}