Completed initial database design

Sealed qualifying public classes
Migrated database changes

LiteCharms.Features/Extensions/Hash.cs

@@ -2,12 +2,12 @@
 
 public static class Hash
 {
-    public static Func<string?, string?> StringToSha256Hash = (input) => 
+    public static readonly Func<string?, string?> StringToSha256Hash = (input) => 
         Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(input!)));
 
-    public static Func<Stream, string?> StreamToSha256Hash = (stream) =>
+    public static readonly Func<Stream, string?> StreamToSha256Hash = (stream) =>
         Convert.ToHexString(SHA256.HashData(stream));
 
-    public static Func<byte[], string?> BytesToSha256Hash = (bytes) =>
+    public static readonly Func<byte[], string?> BytesToSha256Hash = (bytes) =>
         Convert.ToHexString(SHA256.HashData(bytes));
 }

LiteCharms.Features/Extensions/Quartz.cs

@@ -64,7 +64,7 @@ public static class Quartz
             config.UseDefaultThreadPool(options => options.MaxConcurrency = 1);
             config.UseTimeZoneConverter();
 
-            config.SetProperty("quartz.jobStore.misfireThreshold", TimeSpan.FromMinutes(2).TotalMilliseconds.ToString());
+            config.SetProperty("quartz.jobStore.misfireThreshold", TimeSpan.FromMinutes(2).TotalMilliseconds.ToString(CultureInfo.InvariantCulture));
 
             config.UsePersistentStore(storage =>
             {

LiteCharms.Features/Extensions/Timezones.cs

@@ -20,7 +20,7 @@ public static class Timezones
             ? new DateTimeOffset(sourceDateAdjusted.Ticks, SouthAfricanTimeZone.BaseUtcOffset).LocaliseDateTimeOffset(SouthAfricanTimeZone.BaseUtcOffset)
             : new DateTimeOffset(sourceDateAdjusted.Ticks, timezone!.BaseUtcOffset).LocaliseDateTimeOffset(timezone.BaseUtcOffset);
 
-        return DateTimeOffset.Parse(localised!);
+        return DateTimeOffset.Parse(localised!, CultureInfo.InvariantCulture);
     }
 
     public static DateTime UtcNow(this TimeZoneInfo timezone) => ToDateTimeWithTimeZone(DateTime.Now, timezone).UtcDateTime;