CheckUserMail search user by email, return error if someone uses.

CreateNote create new note record.

CreateToken create a new token record.

CreateUser create a user record.

DeleteNote delete a note with id.

DeleteTokenById delete token with id.

FindUserByEmail find user by email.

FindUserById find user by id.

GenerateAccessTokens generates "access" and "refresh" token for user.

GetNotes get paginated note list.

UpdateNote updates a note with id.

VerifyToken checks jwt validity, expire date, blacklisted.