diff --git a/lib/mix/tasks/wnh.scale_fixtures.ex b/lib/mix/tasks/wnh.scale_fixtures.ex
index 6ef55bf..8bec67c 100644
--- a/lib/mix/tasks/wnh.scale_fixtures.ex
+++ b/lib/mix/tasks/wnh.scale_fixtures.ex
@@ -311,33 +311,68 @@ defmodule Mix.Tasks.Wnh.ScaleFixtures do
         'Scale help request ' || value,
         'Persistent synthetic local scale request used to test viewport discovery and UI.',
         'Synthetic data only; no real-world action is requested.',
-        '{"scale_fixture":true}'::jsonb,
-        city.name || ' scale area',
-        CASE WHEN value % 97 = 0 THEN NULL ELSE ST_SetSRID(
+        '{"scale_fixture":true,"scale_fixture_version":3}'::jsonb,
+        city.name || ' synthetic zone ' ||
+          ((variation.category_key + variation.time_key) % 100 + 1),
+        CASE WHEN variation.visibility_key % 97 = 0 THEN NULL ELSE ST_SetSRID(
           ST_MakePoint(
-            city.longitude + (((value * 97) % 1001) - 500) / 100000.0,
-            city.latitude + (((value * 193) % 1001) - 500) / 100000.0
+            city.longitude +
+              ((variation.longitude_key % 4001) - 2000) / 1000.0,
+            city.latitude +
+              ((variation.latitude_key % 4003) - 2001) / 1000.0
           ),
           4326
         ) END,
-        CASE WHEN value % 10 < 8 THEN 'open'
-             WHEN value % 10 = 8 THEN 'completed'
+        CASE WHEN variation.status_key % 10 < 8 THEN 'open'
+             WHEN variation.status_key % 10 = 8 THEN 'completed'
              ELSE 'cancelled' END,
-        CASE value % 3 WHEN 0 THEN 'now' WHEN 1 THEN 'today' ELSE 'scheduled' END,
-        CASE WHEN value % 97 = 0 THEN 'hidden'
-             WHEN value % 4 = 0 THEN 'exact_public'
-             WHEN value % 4 = 1 THEN 'exact_for_active_match'
+        CASE (variation.status_key / 10) % 3
+          WHEN 0 THEN 'now'
+          WHEN 1 THEN 'today'
+          ELSE 'scheduled'
+        END,
+        CASE WHEN variation.visibility_key % 97 = 0 THEN 'hidden'
+             WHEN (variation.visibility_key / 97) % 4 = 0 THEN 'exact_public'
+             WHEN (variation.visibility_key / 97) % 4 = 1
+               THEN 'exact_for_active_match'
              ELSE 'approximate_public' END,
-        CASE WHEN value % 97 = 0 OR value % 4 = 0 THEN NULL
-             WHEN value % 3 = 0 THEN 500
-             WHEN value % 3 = 1 THEN 1000
+        CASE WHEN variation.visibility_key % 97 = 0
+               OR (variation.visibility_key / 97) % 4 = 0 THEN NULL
+             WHEN (variation.visibility_key / 388) % 3 = 0 THEN 500
+             WHEN (variation.visibility_key / 388) % 3 = 1 THEN 1000
              ELSE 2000 END,
-        date_trunc('second', now()) + ((value % 30) + 1) * interval '1 day',
-        md5('wnh-scale-user-' || ((value % $2) + 1))::uuid,
-        (($3::text[])[((value - 1) % cardinality($3::text[])) + 1])::uuid,
+        date_trunc('second', now()) +
+          ((variation.time_key % 30) + 1) * interval '1 day',
+        md5(
+          'wnh-scale-user-' ||
+            ((variation.longitude_key * 37 + variation.latitude_key) % $2 + 1)
+        )::uuid,
+        (($3::text[])[
+          (variation.category_key % cardinality($3::text[])) + 1
+        ])::uuid,
         date_trunc('second', now()) - value * interval '1 second',
         date_trunc('second', now()) - value * interval '1 second'
       FROM generate_series(1, $1) AS value
+      CROSS JOIN LATERAL (
+        SELECT
+          ((value - 1) % 20)::integer AS city_index,
+          md5('wnh-scale-request-v3-' || value) AS fixture_hash
+      ) AS fixture
+      CROSS JOIN LATERAL (
+        SELECT
+          ('x' || substr(fixture.fixture_hash, 1, 8))::bit(32)::bigint
+            AS longitude_key,
+          ('x' || substr(fixture.fixture_hash, 9, 8))::bit(32)::bigint
+            AS latitude_key,
+          ('x' || substr(fixture.fixture_hash, 17, 4))::bit(16)::bigint
+            AS status_key,
+          ('x' || substr(fixture.fixture_hash, 21, 4))::bit(16)::bigint
+            AS visibility_key,
+          ('x' || substr(fixture.fixture_hash, 25, 4))::bit(16)::bigint
+            AS time_key,
+          ('x' || substr(fixture.fixture_hash, 29, 4))::bit(16)::bigint
+            AS category_key
+      ) AS variation
       CROSS JOIN LATERAL (
         SELECT *
         FROM (
@@ -363,9 +398,22 @@ defmodule Mix.Tasks.Wnh.ScaleFixtures do
             (18, 'Sydney', 151.2093, -33.8688),
             (19, 'Auckland', 174.7633, -36.8485)
         ) AS cities(index, name, longitude, latitude)
-        WHERE cities.index = value % 20
+        WHERE cities.index = fixture.city_index
       ) AS city
-      ON CONFLICT (id) DO NOTHING
+      ON CONFLICT (id) DO UPDATE SET
+        structured_data = EXCLUDED.structured_data,
+        location_label = EXCLUDED.location_label,
+        location = EXCLUDED.location,
+        status = EXCLUDED.status,
+        urgency = EXCLUDED.urgency,
+        location_visibility = EXCLUDED.location_visibility,
+        location_radius_meters = EXCLUDED.location_radius_meters,
+        expires_at = EXCLUDED.expires_at,
+        requester_id = EXCLUDED.requester_id,
+        category_id = EXCLUDED.category_id,
+        updated_at = EXCLUDED.updated_at
+      WHERE help_requests.structured_data @> '{"scale_fixture":true}'::jsonb
+        AND help_requests.structured_data ->> 'scale_fixture_version' IS DISTINCT FROM '3'
       """,
       [rows, @synthetic_users, category_ids],
       timeout: :infinity,
@@ -385,27 +433,60 @@ defmodule Mix.Tasks.Wnh.ScaleFixtures do
         md5('wnh-scale-activity-v1-' || value)::uuid,
         'Scale community activity ' || value,
         'Persistent synthetic local scale activity used to test viewport discovery and UI.',
-        '{"scale_fixture":true}'::jsonb,
-        city.name || ' public meeting area',
+        '{"scale_fixture":true,"scale_fixture_version":3}'::jsonb,
+        city.name || ' synthetic zone ' ||
+          ((variation.category_key + variation.time_key) % 100 + 1),
         ST_SetSRID(
           ST_MakePoint(
-            city.longitude + (((value * 89) % 1001) - 500) / 100000.0,
-            city.latitude + (((value * 181) % 1001) - 500) / 100000.0
+            city.longitude +
+              ((variation.longitude_key % 4001) - 2000) / 1000.0,
+            city.latitude +
+              ((variation.latitude_key % 4003) - 2001) / 1000.0
           ),
           4326
         ),
-        CASE WHEN value % 97 = 0 THEN 'hidden' ELSE 'approximate_public' END,
-        CASE WHEN value % 10 < 8 THEN 'open'
-             WHEN value % 10 = 8 THEN 'completed'
+        CASE WHEN variation.visibility_key % 97 = 0
+          THEN 'hidden'
+          ELSE 'approximate_public'
+        END,
+        CASE WHEN variation.status_key % 10 < 8 THEN 'open'
+             WHEN variation.status_key % 10 = 8 THEN 'completed'
              ELSE 'cancelled' END,
-        date_trunc('second', now()) + ((value % 60) + 2) * interval '1 day',
-        date_trunc('second', now()) + ((value % 60) + 1) * interval '1 day',
-        2 + (value % 19),
-        md5('wnh-scale-user-' || ((value % $2) + 1))::uuid,
-        (($3::text[])[((value - 1) % cardinality($3::text[])) + 1])::uuid,
+        date_trunc('second', now()) +
+          ((variation.time_key % 60) + 2) * interval '1 day',
+        date_trunc('second', now()) +
+          ((variation.time_key % 60) + 1) * interval '1 day',
+        2 + ((variation.status_key + variation.time_key) % 19),
+        md5(
+          'wnh-scale-user-' ||
+            ((variation.longitude_key * 37 + variation.latitude_key) % $2 + 1)
+        )::uuid,
+        (($3::text[])[
+          (variation.category_key % cardinality($3::text[])) + 1
+        ])::uuid,
         date_trunc('second', now()) - value * interval '1 second',
         date_trunc('second', now()) - value * interval '1 second'
       FROM generate_series(1, $1) AS value
+      CROSS JOIN LATERAL (
+        SELECT
+          ((value - 1) % 20)::integer AS city_index,
+          md5('wnh-scale-activity-v3-' || value) AS fixture_hash
+      ) AS fixture
+      CROSS JOIN LATERAL (
+        SELECT
+          ('x' || substr(fixture.fixture_hash, 1, 8))::bit(32)::bigint
+            AS longitude_key,
+          ('x' || substr(fixture.fixture_hash, 9, 8))::bit(32)::bigint
+            AS latitude_key,
+          ('x' || substr(fixture.fixture_hash, 17, 4))::bit(16)::bigint
+            AS status_key,
+          ('x' || substr(fixture.fixture_hash, 21, 4))::bit(16)::bigint
+            AS visibility_key,
+          ('x' || substr(fixture.fixture_hash, 25, 4))::bit(16)::bigint
+            AS time_key,
+          ('x' || substr(fixture.fixture_hash, 29, 4))::bit(16)::bigint
+            AS category_key
+      ) AS variation
       CROSS JOIN LATERAL (
         SELECT *
         FROM (
@@ -431,9 +512,22 @@ defmodule Mix.Tasks.Wnh.ScaleFixtures do
             (18, 'Sydney', 151.2093, -33.8688),
             (19, 'Auckland', 174.7633, -36.8485)
         ) AS cities(index, name, longitude, latitude)
-        WHERE cities.index = value % 20
+        WHERE cities.index = fixture.city_index
       ) AS city
-      ON CONFLICT (id) DO NOTHING
+      ON CONFLICT (id) DO UPDATE SET
+        structured_data = EXCLUDED.structured_data,
+        location_label = EXCLUDED.location_label,
+        location = EXCLUDED.location,
+        location_visibility = EXCLUDED.location_visibility,
+        status = EXCLUDED.status,
+        starts_at = EXCLUDED.starts_at,
+        join_deadline = EXCLUDED.join_deadline,
+        capacity = EXCLUDED.capacity,
+        creator_id = EXCLUDED.creator_id,
+        category_id = EXCLUDED.category_id,
+        updated_at = EXCLUDED.updated_at
+      WHERE activities.structured_data @> '{"scale_fixture":true}'::jsonb
+        AND activities.structured_data ->> 'scale_fixture_version' IS DISTINCT FROM '3'
       """,
       [rows, @synthetic_users, category_ids],
       timeout: :infinity,