chore: store vacuum and clean (#2293)

* Move all vacuum code into driver

* Remove db from Store

store/sqlite/memo.go

@@ -234,6 +234,10 @@ func (d *Driver) DeleteMemo(ctx context.Context, delete *store.DeleteMemo) error
 		return err
 	}
 
+	if err := d.Vacuum(ctx); err != nil {
+		// Prevent linter warning.
+		return err
+	}
 	return nil
 }
 
@@ -268,3 +272,22 @@ func (d *Driver) FindMemosVisibilityList(ctx context.Context, memoIDs []int32) (
 
 	return visibilityList, nil
 }
+
+func vacuumMemo(ctx context.Context, tx *sql.Tx) error {
+	stmt := `
+	DELETE FROM 
+		memo 
+	WHERE 
+		creator_id NOT IN (
+			SELECT 
+				id 
+			FROM 
+				user
+		)`
+	_, err := tx.ExecContext(ctx, stmt)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}