Service members need to be created in advance.

The status of one table.

Define the possible errors returned by DB interfaces.

Define the possible errors returned by DB interfaces.

Define the possible errors returned by DB interfaces.

Define the possible errors returned by DB interfaces.

RecordNotFound is when the key does not exist in db.

ResourceNotFound is for dynamodb table.

Define the possible errors returned by DB interfaces.

Define the possible errors returned by DB interfaces.

DB defines the DB interfaces The design aims to provide the flexibility to support different type of key-value DBs.