akonadi-backend-sqlite - 4:18.08.3-7~deb10u1 main

Akonadi is an extensible cross-desktop Personal Information Management (PIM)
storage service. It provides a common framework for applications to store and
access mail, calendars, addressbooks, and other PIM data.
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This package installs everything what's needed for Akonadi to work with SQLite
as underlying data storage engine. Since SQLite is an embedded database
engine, a separate SQL server daemon is not necessary.
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In addition, the package contains an improved QSql driver for SQLite named
"QSQLite3". It can be used by any application that needs to access SQLite
databases via standard Qt QSql framework.