Lucas_Werkmeister_WMDE added a comment.

  Brief check for usages on enwiki:
  
    MariaDB [enwiki_p]> SELECT eu_aspect, eu_page_id FROM wbc_entity_usage 
WHERE eu_entity_id = 'Q1513315' ORDER BY eu_page_id DESC LIMIT 13;
    +-----------+------------+
    | eu_aspect | eu_page_id |
    +-----------+------------+
    | C.P793    |   67023127 |
    | O         |   67023127 |
    | C.P793    |   66824389 |
    | O         |   66824389 |
    | C.P18     |   60532910 |
    | C.P2670   |   60101418 |
    | L.en      |   60101418 |
    | O         |   60101418 |
    | C.P793    |   60101418 |
    | L.en      |   57316060 |
    | C.P2670   |   57316060 |
    | C.P793    |   57316060 |
    | O         |   57316060 |
    +-----------+------------+
    13 rows in set (0.00 sec)
  
  This supports the idea that we’re adding lots of “other” usages with 
“statement” usages.
  
  I then did a more thor check on cawiki, and there are ~12k distinct pages 
that have some `C%` usage but no `O` usage:
  
    SELECT DISTINCT u1.eu_page_id FROM wbc_entity_usage AS u1 LEFT JOIN 
wbc_entity_usage AS u2 ON u1.eu_page_id = u2.eu_page_id AND u2.eu_aspect = 'O' 
WHERE u1.eu_aspect LIKE 'C%' AND u2.eu_page_id IS NULL;
  
  I guess those must be coming from accesses to the `claims` in Lua (which, 
unlike the `getEntityStatements` function, doesn’t add an “other” usage, if I 
read the code correctly). But that’s a fairly small proportion compared to the 
~614k total distinct pages with `C%` usage on cawiki.

TASK DETAIL
  https://phabricator.wikimedia.org/T283040

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To: Lucas_Werkmeister_WMDE
Cc: Lucas_Werkmeister_WMDE, Ladsgroup, Michael, Manuel, Addshore, 
RBrounley_WMF, Aklapper, Reedy, Invadibot, maantietaja, Akuckartz, apaskulin, 
Iflorez, alaa_wmde, Nandana, lucamauri, Cpaulf30, Lahi, Gq86, 
GoranSMilovanovic, Ivana_Isadora, QZanden, LawExplorer, _jensen, rosalieper, 
Scott_WUaS, Wikidata-bugs, aude, Dinoguy1000, Lydia_Pintscher, Mbch331, Jay8g
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