don't double factor trust

prisma/migrations/20241219002217_improve_values_again/migration.sql

@@ -0,0 +1,94 @@
+CREATE OR REPLACE FUNCTION user_values(
+    min TIMESTAMP(3), max TIMESTAMP(3), ival INTERVAL, date_part TEXT,
+    percentile_cutoff INTEGER DEFAULT 50,
+    each_upvote_portion FLOAT DEFAULT 4.0,
+    each_item_portion FLOAT DEFAULT 4.0,
+    handicap_ids INTEGER[] DEFAULT '{616, 6030, 4502, 27}',
+    handicap_zap_mult FLOAT DEFAULT 0.3)
+RETURNS TABLE (
+    t TIMESTAMP(3), id INTEGER, proportion FLOAT
+)
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    min_utc TIMESTAMP(3) := timezone('utc', min AT TIME ZONE 'America/Chicago');
+BEGIN
+    RETURN QUERY
+    SELECT period.t, u."userId", u.total_proportion
+    FROM generate_series(min, max, ival) period(t),
+    LATERAL
+        (WITH item_ratios AS (
+            SELECT *,
+                CASE WHEN "parentId" IS NULL THEN 'POST' ELSE 'COMMENT' END as type,
+                CASE WHEN "weightedVotes" > 0 THEN "weightedVotes"/(sum("weightedVotes") OVER (PARTITION BY "parentId" IS NULL)) ELSE 0 END AS ratio
+            FROM (
+                SELECT *,
+                    NTILE(100)  OVER (PARTITION BY "parentId" IS NULL ORDER BY ("weightedVotes"-"weightedDownVotes") desc) AS percentile,
+                    ROW_NUMBER()  OVER (PARTITION BY "parentId" IS NULL ORDER BY ("weightedVotes"-"weightedDownVotes") desc) AS rank
+                FROM
+                    "Item"
+                WHERE date_trunc(date_part, created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = period.t
+                AND "weightedVotes" > 0
+                AND "deletedAt" IS NULL
+                AND NOT bio
+                AND ("invoiceActionState" IS NULL OR "invoiceActionState" = 'PAID')
+            ) x
+            WHERE x.percentile <= percentile_cutoff
+        ),
+        -- get top upvoters of top posts and comments
+        upvoter_islands AS (
+            SELECT "ItemAct"."userId", item_ratios.id, item_ratios.ratio, item_ratios."parentId",
+                "ItemAct".msats as tipped, "ItemAct".created_at as acted_at,
+                ROW_NUMBER() OVER (partition by item_ratios.id order by "ItemAct".created_at asc)
+                - ROW_NUMBER() OVER (partition by item_ratios.id, "ItemAct"."userId" order by "ItemAct".created_at asc) AS island
+            FROM item_ratios
+            JOIN "ItemAct" on "ItemAct"."itemId" = item_ratios.id
+            WHERE act = 'TIP'
+            AND date_trunc(date_part, "ItemAct".created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = period.t
+            AND ("ItemAct"."invoiceActionState" IS NULL OR "ItemAct"."invoiceActionState" = 'PAID')
+        ),
+        -- isolate contiguous upzaps from the same user on the same item so that when we take the log
+        -- of the upzaps it accounts for successive zaps and does not disproportionately reward them
+        -- quad root of the total tipped
+        upvoters AS (
+            SELECT "userId", upvoter_islands.id, ratio, "parentId", GREATEST(power(sum(tipped) / 1000, 0.25), 0) as tipped, min(acted_at) as acted_at
+            FROM upvoter_islands
+            GROUP BY "userId", upvoter_islands.id, ratio, "parentId", island
+            HAVING CASE WHEN "parentId" IS NULL THEN sum(tipped) / 1000 > 40 ELSE sum(tipped) / 1000 > 20 END
+        ),
+        -- the relative contribution of each upvoter to the post/comment
+        -- early component: 1/ln(early_rank + e - 1)
+        -- tipped component: how much they tipped relative to the total tipped for the item
+        -- multiplied by the relative rank of the item to the total items
+        -- multiplied by the trust of the user
+        upvoter_ratios AS (
+            SELECT "userId", sum((2*early_multiplier+1)*tipped_ratio*ratio) as upvoter_ratio,
+                "parentId" IS NULL as "isPost", CASE WHEN "parentId" IS NULL THEN 'TIP_POST' ELSE 'TIP_COMMENT' END as type
+            FROM (
+                SELECT *,
+                    1.0/LN(ROW_NUMBER() OVER (partition by upvoters.id order by acted_at asc) + EXP(1.0) - 1) AS early_multiplier,
+                    tipped::float/(sum(tipped) OVER (partition by upvoters.id)) tipped_ratio
+                FROM upvoters
+                WHERE tipped > 0
+            ) u
+            JOIN users on "userId" = users.id
+            GROUP BY "userId", "parentId" IS NULL
+        ),
+        proportions AS (
+            SELECT "userId", NULL as id, type, ROW_NUMBER() OVER (PARTITION BY "isPost" ORDER BY upvoter_ratio DESC) as rank,
+                upvoter_ratio/(sum(upvoter_ratio) OVER (PARTITION BY "isPost"))/each_upvote_portion as proportion
+            FROM upvoter_ratios
+            WHERE upvoter_ratio > 0
+            UNION ALL
+            SELECT "userId", item_ratios.id, type, rank, ratio/each_item_portion as proportion
+            FROM item_ratios
+        )
+        SELECT "userId", sum(proportions.proportion) AS total_proportion
+        FROM proportions
+        GROUP BY "userId"
+        HAVING sum(proportions.proportion) > 0.000001) u;
+END;
+$$;
+
+REFRESH MATERIALIZED VIEW CONCURRENTLY user_values_today;
+REFRESH MATERIALIZED VIEW CONCURRENTLY user_values_days;