Merge branch 'main' into update-flows-diagrams

Author: renejeglinsky

guides/messaging/index.md

@@ -644,3 +644,17 @@ S4Bupa.on ('BusinessPartner.Changed', msg => {...})
 Find more detailed information specific to receiving events from SAP S/4HANA in this separate guide:
 [→ **_Receiving Events from SAP S/4HANA_**](./s4)
 :::
+
+
+## [Task Queues](task-queues)
+
+The _Outbox Pattern_ is a reliable strategy used in distributed systems to ensure that messages or events are consistently recorded and delivered, even in the face of failures.
+This pattern, however, can not only be applied to outbound messages, but to inbound messages and server-internal background tasks as well.
+The core principle remains the same:
+1. Persist the message (or _task_) in the database -- using the same transaction as the triggering action, if applicable
+2. Process it asynchronously afterwards -- incl. retries, if necessary
+
+::: tip Read the guide
+Find additional information about modeling task queues in this guide:
+[→ **_Task Queues_**](task-queues)
+:::

guides/providing-services.md

@@ -1101,6 +1101,24 @@ entity Person : cuid {
 
 Next to input validation, you can add [database constraints](databases#database-constraints) to prevent invalid data from being persisted.
 
+## [Constraints](services/constraints)
+
+Declarative constraints allow you to express conditions using CXL expressions that are validated automatically whenever data is written, greatly reducing the need for extensive custom code for input validation.
+
+::: tip Read the guide
+Find additional information about constraints in this guide:
+[→ **_Constraints_**](services/status-flows)
+:::
+
+## [Status-Transition Flows](services/status-flows)
+
+Status-transition flows ensure transitions are explicitly modeled, validated, and executed in a controlled and reliable way, thereby eliminating the need for extensive custom coding.
+
+::: tip Read the guide
+Find additional information about modeling status-transition flows in this guide:<br>
+[&rarr; **_Status-Transition Flows_**](services/status-flows)
+:::
+
 ## Custom Logic