chore: fix clear rate definition in map service

Author: mworzala

services/map-service/internal/db/migrations/000019_clear_rate_not_win_count.sql

@@ -0,0 +1,51 @@
+create or replace view maps_published as
+select m.id,
+       m.owner,
+       m.m_type,
+       m.created_at,
+       m.updated_at,
+       m.authz_key,
+       m.verification,
+       m.file_id,
+       m.legacy_map_id,
+       m.published_id,
+       m.published_at,
+       m.quality_override,
+       m.opt_name,
+       m.opt_icon,
+       m.size,
+       m.opt_variant,
+       m.opt_subvariant,
+       m.opt_spawn_point,
+       m.opt_only_sprint,
+       m.opt_no_sprint,
+       m.opt_no_jump,
+       m.opt_no_sneak,
+       m.opt_boat,
+       m.opt_extra,
+       m.opt_tags,
+       m.protocol_version,
+       m.contest,
+       m.listed,
+       m.ext,
+       coalesce(stats.play_count, 0) as play_count,
+       coalesce(stats.win_count, 0) as win_count,
+       coalesce(likes.total_likes, 0) as total_likes,
+       coalesce(stats.clear_rate, 0) as clear_rate,
+       case
+         when stats.play_count < 10 then -1
+         when stats.clear_rate < 0.05 then 4
+         when stats.clear_rate < 0.25 then 3
+         when stats.clear_rate < 0.5 then 2
+         when stats.clear_rate < 0.75 then 1
+         else 0
+         end as difficulty
+from public.maps as m
+  left join (select map_id, play_count, win_count, win_count::float / nullif(play_count, 0)::float as clear_rate
+             from map_stats) stats on m.id = stats.map_id
+  left join (select map_id, sum(case when rating = 1 then 1 when rating = 2 then -1 else 0 end) as total_likes
+             from map_ratings
+             group by map_id) likes on m.id = likes.map_id
+where m.deleted_at is null
+  and m.published_at is not null
+  and m.published_id is not null;