When exporting a diagramm with a "database" object to latex, the background color is missing. This can be fixed by adding "fill=plantucolorN" to the main form. Below is a part of Latex export with the fix marked:
\draw[color=red,line width=1.5pt, fill=blue] (473.5pt,155pt) ..controls (473.5pt,145pt) and (535pt,145pt) .. (535pt,145pt) ..controls (535pt,145pt) and (596.5pt,145pt) .. (596.5pt,155pt) -- (596.5pt,181.6094pt) ..controls (596.5pt,191.6094pt) and (535pt,191.6094pt) .. (535pt,191.6094pt) ..controls (535pt,191.6094pt) and (473.5pt,191.6094pt) .. (473.5pt,181.6094pt) -- (473.5pt,155pt);
\draw[color=red,line width=1.5pt] (473.5pt,155pt) ..controls (473.5pt,165pt) and (535pt,165pt) .. (535pt,165pt) ..controls (535pt,165pt) and (596.5pt,165pt) .. (596.5pt,155pt);
\node at (483.5pt,169pt)[below right]{MyDataBase};
(p.s. the eyesight killing colors are just for testing)