<basic tables>

wp_esi_tag
wp_esi_technology
wp_esi_industry
wp_esi_function

<entity cross-tables>
wp_esi_tag_entity        << wp_esi_entity_tag        << better rename
wp_esi_technology_entity << wp_esi_entity_technology << better rename
wp_esi_entity_industry   == wp_esi_entity_industry
?                        == wp_esi_entity_function

<news cross-tables>
wp_esi_tag_news           << wp_esi_news_tag
wp_esi_technology_news    << wp_esi_news_technology
wp_esi_news_industry      == wp_esi_news_industry 
?                         == wp_esi_news_function  

<radar cross-tables>
wp_esi_radar_industry     == wp_esi_radar_industry
...

-------------------------------

nrow(df_technology) = 38
nrow(df_industry) = 208
nrow(df_functon) = 31

nrow(df_entity_technology) = 8104
nrow(df_entity_industry) = 12355


