Completed initial database design

Sealed qualifying public classes
Migrated database changes

.editorconfig

@@ -3,6 +3,45 @@ root = true
 
 # C# files
 [*.cs]
+# IDE0250: Prefer make struct 'readonly'
+dotnet_diagnostic.IDE0250.severity = warning
+
+# IDE0060: Remove unused parameters (Good cleanup pairing)
+dotnet_diagnostic.IDE0060.severity = warning
+
+# CA1852: Seal internal types (Available in modern .NET)
+dotnet_diagnostic.CA1852.severity = warning
+
+# MA0018: Add sealed modifier to types that are never inherited
+dotnet_diagnostic.MA0018.severity = warning
+
+# Enforce that classes should be sealed
+dotnet_diagnostic.MA0053.severity = warning
+
+# CRITICAL: Force the analyzer to also flag PUBLIC classes, not just internal ones
+meziantou_analyzer.MA0053.public_class_should_be_sealed = true
+MA0053.public_class_should_be_sealed = true
+
+# Keep the rule active as a warning by default
+dotnet_diagnostic.MA0048.severity = warning
+
+# Specific exclusions for Meziantou.Analyzer MA0048
+# Disable the rule for enums
+meziantou_analyzer.MA0048.exclude_enums = true
+
+# Disable the rule for records
+meziantou_analyzer.MA0048.exclude_records = true
+
+#EXCLUDE specific files that are meant to hold grouped enums/records
+dotnet_diagnostic.MA0048.severity = warning
+
+# Disable the requirement to specify ConfigureAwait(false)
+dotnet_diagnostic.MA0004.severity = none
+
+# ALTERNATIVE: Exclude any file ending with 'Enums.cs' or 'Records.cs' 
+# (e.g., BillingEnums.cs, CustomerRecords.cs)
+[**/*{Enums,Records}.cs]
+dotnet_diagnostic.MA0048.severity = none
 
 #### Core EditorConfig Options ####