diff --git a/.editorconfig b/.editorconfig
index cbd7fed..e120000 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -23,7 +23,29 @@ trim_trailing_whitespace = false
 
 [*.cs]
 # --- Naming ------------------------------------------------------------
-# Private fields are camelCase with no underscore prefix.
+# Naming rules only surface in the IDE unless IDE1006 itself has a severity.
+dotnet_diagnostic.IDE1006.severity = warning
+
+# Private constants — including static readonly, constants in spirit — are PascalCase.
+dotnet_naming_rule.private_constants_are_pascal_case.severity = warning
+dotnet_naming_rule.private_constants_are_pascal_case.symbols = private_constants
+dotnet_naming_rule.private_constants_are_pascal_case.style = pascal_case_style
+
+dotnet_naming_symbols.private_constants.applicable_kinds = field
+dotnet_naming_symbols.private_constants.applicable_accessibilities = private
+dotnet_naming_symbols.private_constants.required_modifiers = const
+
+dotnet_naming_rule.private_static_readonly_fields_are_pascal_case.severity = warning
+dotnet_naming_rule.private_static_readonly_fields_are_pascal_case.symbols = private_static_readonly_fields
+dotnet_naming_rule.private_static_readonly_fields_are_pascal_case.style = pascal_case_style
+
+dotnet_naming_symbols.private_static_readonly_fields.applicable_kinds = field
+dotnet_naming_symbols.private_static_readonly_fields.applicable_accessibilities = private
+dotnet_naming_symbols.private_static_readonly_fields.required_modifiers = static, readonly
+
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+
+# All other private fields are camelCase with no underscore prefix.
 dotnet_naming_rule.private_fields_are_camel_case.severity = warning
 dotnet_naming_rule.private_fields_are_camel_case.symbols = private_fields
 dotnet_naming_rule.private_fields_are_camel_case.style = camel_case_style
diff --git a/.gitignore b/.gitignore
index 9d3727a..eb8c03b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,6 +56,9 @@ CodeCoverage/
 TestResult.xml
 nunit-*.xml
 
+# JetBrains Rider
+.idea/
+
 # Zitadel dev PATs written by the AppHost bind mount
 .zitadel/
 
diff --git a/CLAUDE.md b/CLAUDE.md
index 99221dd..37cb8a4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -105,7 +105,8 @@ restart the AppHost.
 
 - UTC instants end in `Utc` (`CreatedAtUtc`). Identifiers are spelled out —
   no abbreviations.
-- Private fields are camelCase without an underscore prefix.
+- Private fields are camelCase without an underscore prefix; private
+  constants and static readonly fields are PascalCase.
 - No nested local functions — write a normal method. Don't reach for local
   functions; extract a private method instead. A one-liner local function can
   occasionally be acceptable, but that's an edge case, not something to aim
diff --git a/docs/technical-requirements.md b/docs/technical-requirements.md
index 2794089..307b987 100644
--- a/docs/technical-requirements.md
+++ b/docs/technical-requirements.md
@@ -304,7 +304,8 @@ manipulates state itself (seeding through EF, reflection as a last resort).
 
 - **Naming:** UTC instants end in `Utc` (`CreatedAtUtc`); identifiers are
   spelled out in full — no abbreviations; private fields are camelCase without
-  an underscore prefix.
+  an underscore prefix, while private constants and static readonly fields are
+  PascalCase.
 - **No nested local functions — write a normal method.** Don't reach for
   local functions; extract a private method instead. A one-liner local
   function can occasionally be acceptable, but that's an edge case, not
diff --git a/src/ProductReviews.Domain/ProductReviews.Domain.csproj b/src/ProductReviews.Domain/ProductReviews.Domain.csproj
index 9b3fbe9..ec7702e 100644
--- a/src/ProductReviews.Domain/ProductReviews.Domain.csproj
+++ b/src/ProductReviews.Domain/ProductReviews.Domain.csproj
@@ -5,6 +5,7 @@
     <PackageReference Include="Kalicz.StrongTypes.EfCore" />
     <!-- Explicit floor so every project resolves one EF version (the Npgsql provider's transitive is older). -->
     <PackageReference Include="Microsoft.EntityFrameworkCore" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>