db optimizations around names and case-sensitivity (#2749)

* generate (case-insensitive) unique names for fields that should be unique

* move name case-insensitivity down to schema level

* update changelog

ErsatzTV.Infrastructure/Data/Repositories/ChannelRepository.cs

@@ -51,9 +51,7 @@ public class ChannelRepository(IDbContextFactory<TvContext> dbContextFactory) :
 
         List<ChannelWatermark> maybeWatermarks = await dbContext.ChannelWatermarks
             .AsNoTracking()
-            .Where(cw => EF.Functions.Like(
-                EF.Functions.Collate(cw.Name, TvContext.CaseInsensitiveCollation),
-                $"%{name}%"))
+            .Where(cw => EF.Functions.Like(cw.Name, $"%{name}%"))
             .ToListAsync();
 
         return maybeWatermarks.HeadOrNone();