Another important bit of information for content entities is the database table name they will use for storage:
base_table = "node",
data_table = "node_field_data",
The node table in this case holds the primary information about the entities such as ID, uuid or bundle, while the node_field_data table holds field data that is singular and not translatable. Otherwise, these fields get their own database tables automatically. I will explain how field data is stored a bit later on.