diff --git a/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListDetailsVm.cs b/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListDetailsVm.cs
index c5218f8be..6b468e6a9 100644
--- a/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListDetailsVm.cs
+++ b/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListDetailsVm.cs
@@ -6,10 +6,10 @@ public record ListDetailsVm
     public string Name { get; init; } = null!;
     public string? Description { get; init; }
     public int? LicenseId { get; init; }
-    public IReadOnlyCollection<int> SyntaxIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<string> Iso6391s { get; init; } = new HashSet<string>();
-    public IReadOnlyCollection<int> TagIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<ViewUrlVm> ViewUrls { get; init; } = new HashSet<ViewUrlVm>();
+    public IEnumerable<int> SyntaxIds { get; init; } = new HashSet<int>();
+    public IEnumerable<string> Iso6391s { get; init; } = new HashSet<string>();
+    public IEnumerable<int> TagIds { get; init; } = new HashSet<int>();
+    public IEnumerable<ViewUrlVm> ViewUrls { get; init; } = new HashSet<ViewUrlVm>();
     public Uri? HomeUrl { get; init; }
     public Uri? OnionUrl { get; init; }
     public Uri? PolicyUrl { get; init; }
@@ -19,13 +19,13 @@ public record ListDetailsVm
     public Uri? ChatUrl { get; init; }
     public string? EmailAddress { get; init; }
     public Uri? DonateUrl { get; init; }
-    public IReadOnlyCollection<int> MaintainerIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> UpstreamFilterListIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> ForkFilterListIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> IncludedInFilterListIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> IncludesFilterListIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> DependencyFilterListIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<int> DependentFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> MaintainerIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> UpstreamFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> ForkFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> IncludedInFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> IncludesFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> DependencyFilterListIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> DependentFilterListIds { get; init; } = new HashSet<int>();
 
     public record ViewUrlVm
     {
diff --git a/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListVm.cs b/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListVm.cs
index e33e31112..c270ec490 100644
--- a/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListVm.cs
+++ b/services/Directory/FilterLists.Directory.Api.Contracts/Models/ListVm.cs
@@ -6,9 +6,9 @@ public record ListVm
     public string Name { get; init; } = null!;
     public string? Description { get; init; }
     public int? LicenseId { get; init; }
-    public IReadOnlyCollection<int> SyntaxIds { get; init; } = new HashSet<int>();
-    public IReadOnlyCollection<string> Iso6391s { get; init; } = new HashSet<string>();
-    public IReadOnlyCollection<int> TagIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> SyntaxIds { get; init; } = new HashSet<int>();
+    public IEnumerable<string> Iso6391s { get; init; } = new HashSet<string>();
+    public IEnumerable<int> TagIds { get; init; } = new HashSet<int>();
     public Uri? PrimaryViewUrl { get; init; }
-    public IReadOnlyCollection<int> MaintainerIds { get; init; } = new HashSet<int>();
+    public IEnumerable<int> MaintainerIds { get; init; } = new HashSet<int>();
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetLanguages.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetLanguages.cs
index 02ea64bd6..0d2952ceb 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetLanguages.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetLanguages.cs
@@ -48,6 +48,6 @@ public record LanguageVm
     {
         public string Iso6391 { get; init; } = null!;
         public string Name { get; init; } = null!;
-        public IReadOnlyCollection<int> FilterListIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> FilterListIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetLicenses.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetLicenses.cs
index 0d3159768..8ce1f0f5a 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetLicenses.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetLicenses.cs
@@ -50,6 +50,6 @@ public record LicenseVm
         public bool PermitsModification { get; init; }
         public bool PermitsDistribution { get; init; }
         public bool PermitsCommercialUse { get; init; }
-        public IReadOnlyCollection<int> FilterListIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> FilterListIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetMaintainers.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetMaintainers.cs
index 500d89079..c16058924 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetMaintainers.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetMaintainers.cs
@@ -51,6 +51,6 @@ public record MaintainerVm
         public Uri? Url { get; init; }
         public string? EmailAddress { get; init; }
         public string? TwitterHandle { get; init; }
-        public IReadOnlyCollection<int> FilterListIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> FilterListIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetSoftware.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetSoftware.cs
index 463979ad9..c683a9acb 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetSoftware.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetSoftware.cs
@@ -51,6 +51,6 @@ public record SoftwareVm
         public Uri? HomeUrl { get; init; }
         public Uri? DownloadUrl { get; init; }
         public bool SupportsAbpUrlScheme { get; init; }
-        public IReadOnlyCollection<int> SyntaxIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> SyntaxIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetSyntaxes.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetSyntaxes.cs
index 10eef6c7d..949f4e926 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetSyntaxes.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetSyntaxes.cs
@@ -53,7 +53,7 @@ public record SyntaxVm
         public string Name { get; init; } = null!;
         public string? Description { get; init; }
         public Uri? Url { get; init; }
-        public IReadOnlyCollection<int> FilterListIds { get; init; } = new HashSet<int>();
-        public IReadOnlyCollection<int> SoftwareIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> FilterListIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> SoftwareIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Application/Queries/GetTags.cs b/services/Directory/FilterLists.Directory.Application/Queries/GetTags.cs
index 3424c9e1f..577f69342 100644
--- a/services/Directory/FilterLists.Directory.Application/Queries/GetTags.cs
+++ b/services/Directory/FilterLists.Directory.Application/Queries/GetTags.cs
@@ -49,6 +49,6 @@ public record TagVm
         public int Id { get; init; }
         public string Name { get; init; } = null!;
         public string? Description { get; init; }
-        public IReadOnlyCollection<int> FilterListIds { get; init; } = new HashSet<int>();
+        public IEnumerable<int> FilterListIds { get; init; } = new HashSet<int>();
     }
 }
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/FilterList.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/FilterList.cs
index 944ea9758..659b6da9f 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/FilterList.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/FilterList.cs
@@ -10,10 +10,10 @@ public record FilterList : AggregateRoot
     public string? Description { get; init; }
     public int LicenseId { get; init; }
     public License License { get; init; } = null!;
-    public IReadOnlyCollection<FilterListSyntax> FilterListSyntaxes { get; init; } = new HashSet<FilterListSyntax>();
-    public IReadOnlyCollection<FilterListLanguage> FilterListLanguages { get; init; } = new HashSet<FilterListLanguage>();
-    public IReadOnlyCollection<FilterListTag> FilterListTags { get; init; } = new HashSet<FilterListTag>();
-    public IReadOnlyCollection<FilterListViewUrl> ViewUrls { get; init; } = new HashSet<FilterListViewUrl>();
+    public IEnumerable<FilterListSyntax> FilterListSyntaxes { get; init; } = new HashSet<FilterListSyntax>();
+    public IEnumerable<FilterListLanguage> FilterListLanguages { get; init; } = new HashSet<FilterListLanguage>();
+    public IEnumerable<FilterListTag> FilterListTags { get; init; } = new HashSet<FilterListTag>();
+    public IEnumerable<FilterListViewUrl> ViewUrls { get; init; } = new HashSet<FilterListViewUrl>();
     public Uri? HomeUrl { get; init; }
     public Uri? OnionUrl { get; init; }
     public Uri? PolicyUrl { get; init; }
@@ -23,13 +23,13 @@ public record FilterList : AggregateRoot
     public Uri? ChatUrl { get; init; }
     public string? EmailAddress { get; init; }
     public Uri? DonateUrl { get; init; }
-    public IReadOnlyCollection<FilterListMaintainer> FilterListMaintainers { get; init; } = new HashSet<FilterListMaintainer>();
-    public IReadOnlyCollection<Fork> UpstreamFilterLists { get; init; } = new HashSet<Fork>();
-    public IReadOnlyCollection<Fork> ForkFilterLists { get; init; } = new HashSet<Fork>();
-    public IReadOnlyCollection<Merge> IncludedInFilterLists { get; init; } = new HashSet<Merge>();
-    public IReadOnlyCollection<Merge> IncludesFilterLists { get; init; } = new HashSet<Merge>();
-    public IReadOnlyCollection<Dependent> DependencyFilterLists { get; init; } = new HashSet<Dependent>();
-    public IReadOnlyCollection<Dependent> DependentFilterLists { get; init; } = new HashSet<Dependent>();
+    public IEnumerable<FilterListMaintainer> FilterListMaintainers { get; init; } = new HashSet<FilterListMaintainer>();
+    public IEnumerable<Fork> UpstreamFilterLists { get; init; } = new HashSet<Fork>();
+    public IEnumerable<Fork> ForkFilterLists { get; init; } = new HashSet<Fork>();
+    public IEnumerable<Merge> IncludedInFilterLists { get; init; } = new HashSet<Merge>();
+    public IEnumerable<Merge> IncludesFilterLists { get; init; } = new HashSet<Merge>();
+    public IEnumerable<Dependent> DependencyFilterLists { get; init; } = new HashSet<Dependent>();
+    public IEnumerable<Dependent> DependentFilterLists { get; init; } = new HashSet<Dependent>();
 }
 
 internal class FilterListTypeConfiguration : AggregateRootTypeConfiguration<FilterList>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Language.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Language.cs
index ce1fb8259..2982d6396 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Language.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Language.cs
@@ -7,7 +7,7 @@ public record Language : AggregateRoot
 {
     public string Iso6391 { get; init; } = null!;
     public string Name { get; init; } = null!;
-    public IReadOnlyCollection<FilterListLanguage> FilterListLanguages { get; init; } = new HashSet<FilterListLanguage>();
+    public IEnumerable<FilterListLanguage> FilterListLanguages { get; init; } = new HashSet<FilterListLanguage>();
 }
 
 internal class LanguageTypeConfiguration : AggregateRootTypeConfiguration<Language>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/License.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/License.cs
index ffb044e51..29fae9af1 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/License.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/License.cs
@@ -11,7 +11,7 @@ public record License : AggregateRoot
     public bool PermitsModification { get; init; }
     public bool PermitsDistribution { get; init; }
     public bool PermitsCommercialUse { get; init; }
-    public IReadOnlyCollection<FilterList> FilterLists { get; init; } = new HashSet<FilterList>();
+    public IEnumerable<FilterList> FilterLists { get; init; } = new HashSet<FilterList>();
 }
 
 internal class LicenseTypeConfiguration : AggregateRootTypeConfiguration<License>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Maintainer.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Maintainer.cs
index 33d97b365..38dbb1b00 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Maintainer.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Maintainer.cs
@@ -10,7 +10,7 @@ public record Maintainer : AggregateRoot
     public Uri? Url { get; init; }
     public string? EmailAddress { get; init; }
     public string? TwitterHandle { get; init; }
-    public IReadOnlyCollection<FilterListMaintainer> FilterListMaintainers { get; init; } = new HashSet<FilterListMaintainer>();
+    public IEnumerable<FilterListMaintainer> FilterListMaintainers { get; init; } = new HashSet<FilterListMaintainer>();
 }
 
 internal class MaintainerTypeConfiguration : AggregateRootTypeConfiguration<Maintainer>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Software.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Software.cs
index a5db1febd..3d4fa9ed0 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Software.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Software.cs
@@ -11,7 +11,7 @@ public record Software : AggregateRoot
     public Uri? HomeUrl { get; init; }
     public Uri? DownloadUrl { get; init; }
     public bool SupportsAbpUrlScheme { get; init; }
-    public IReadOnlyCollection<SoftwareSyntax> SoftwareSyntaxes { get; init; } = new HashSet<SoftwareSyntax>();
+    public IEnumerable<SoftwareSyntax> SoftwareSyntaxes { get; init; } = new HashSet<SoftwareSyntax>();
 }
 
 internal class SoftwareTypeConfiguration : AggregateRootTypeConfiguration<Software>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Syntax.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Syntax.cs
index 0e38396bd..5a8adcf89 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Syntax.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Syntax.cs
@@ -9,8 +9,8 @@ public record Syntax : AggregateRoot
     public string Name { get; init; } = null!;
     public string? Description { get; init; }
     public Uri? Url { get; init; }
-    public IReadOnlyCollection<FilterListSyntax> FilterListSyntaxes { get; init; } = new HashSet<FilterListSyntax>();
-    public IReadOnlyCollection<SoftwareSyntax> SoftwareSyntaxes { get; init; } = new HashSet<SoftwareSyntax>();
+    public IEnumerable<FilterListSyntax> FilterListSyntaxes { get; init; } = new HashSet<FilterListSyntax>();
+    public IEnumerable<SoftwareSyntax> SoftwareSyntaxes { get; init; } = new HashSet<SoftwareSyntax>();
 }
 
 internal class SyntaxTypeConfiguration : AggregateRootTypeConfiguration<Syntax>
diff --git a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Tag.cs b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Tag.cs
index 42b43e2e3..1f25c6e26 100644
--- a/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Tag.cs
+++ b/services/Directory/FilterLists.Directory.Infrastructure/Persistence/Queries/Entities/Tag.cs
@@ -8,7 +8,7 @@ public record Tag : AggregateRoot
     public int Id { get; init; }
     public string Name { get; init; } = null!;
     public string? Description { get; init; }
-    public IReadOnlyCollection<FilterListTag> FilterListTags { get; init; } = new HashSet<FilterListTag>();
+    public IEnumerable<FilterListTag> FilterListTags { get; init; } = new HashSet<FilterListTag>();
 }
 
 internal class TagTypeConfiguration : AggregateRootTypeConfiguration<Tag>