Test that verifies you can introduce partitioning to archived events …

src/EventSourcingTests/Bugs/Bug_3791_migrating_from_no_partitioning_to_having_partitioning.cs

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+using System.Threading.Tasks;
+using JasperFx.CodeGeneration;
+using JasperFx.Events;
+using Marten;
+using Marten.Testing.Harness;
+using Weasel.Core;
+using Xunit;
+
+namespace EventSourcingTests.Bugs;
+
+public class Bug_3791_migrating_from_no_partitioning_to_having_partitioning : BugIntegrationContext
+{
+    [Fact]
+    public async Task try_it_out()
+    {
+        StoreOptions(o =>
+        {
+            //o.Events.UseArchivedStreamPartitioning = true;
+            o.DisableNpgsqlLogging = true;
+            o.Events.UseOptimizedProjectionRebuilds = true;
+            o.GeneratedCodeMode = TypeLoadMode.Auto;
+            o.Events.AppendMode = EventAppendMode.Quick;
+            o.Events.UseIdentityMapForAggregates = true;
+            o.DatabaseSchemaName = "some_custom_schema";
+            o.UseSystemTextJsonForSerialization(EnumStorage.AsString, Casing.CamelCase, c =>
+            {
+                c.PropertyNameCaseInsensitive = true;
+            });
+        });
+
+        await theStore.Storage.ApplyAllConfiguredChangesToDatabaseAsync();
+
+        var store2 = SeparateStore(o =>
+        {
+            o.Events.UseArchivedStreamPartitioning = true;
+            o.DisableNpgsqlLogging = true;
+            o.Events.UseOptimizedProjectionRebuilds = true;
+            o.GeneratedCodeMode = TypeLoadMode.Auto;
+            o.Events.AppendMode = EventAppendMode.Quick;
+            o.Events.UseIdentityMapForAggregates = true;
+            o.DatabaseSchemaName = "some_custom_schema";
+            o.UseSystemTextJsonForSerialization(EnumStorage.AsString, Casing.CamelCase, c =>
+            {
+                c.PropertyNameCaseInsensitive = true;
+            });
+        });
+
+        await store2.Storage.ApplyAllConfiguredChangesToDatabaseAsync();
+    }
+}