Define a set of data types that the database supports. These will have to be handled by the storage engine which needs to seralize/deserialize them when writing to or reading from the disk.
Data is stored in pages managed by the storage engine. Clients can insert a row by passing the data and associated key.
def insert(key, data) -> None:
...
def read(key, data):
...Pages have a fixed size (commonly 4KB) and start with a header to contains information on the page type, number of items, free space and offsets to other parts of the page.