fix(production): cancelledReason im ProductionOrder-Aggregat persistieren

cancel() nimmt jetzt einen reason-Parameter entgegen und speichert ihn
im Aggregat, wie im DDD-Modell (04-production-bc.md) spezifiziert.
Liquibase-Migration für cancelled_reason-Spalte ergänzt.

backend/src/main/java/de/effigenix/application/production/CancelProductionOrder.java

@@ -42,7 +42,7 @@ public class CancelProductionOrder {
             }
         }
 
-        switch (order.cancel()) {
+        switch (order.cancel(cmd.reason())) {
             case Result.Failure(var err) -> { return Result.failure(err); }
             case Result.Success(var ignored) -> { }
         }

backend/src/main/java/de/effigenix/domain/production/ProductionOrder.java

@@ -23,7 +23,8 @@ import java.time.ZoneOffset;
  * 8. BatchId is set exactly once (null → non-null) during startProduction()
  * 9. BatchId must not already be assigned (BatchAlreadyAssigned)
  * 10. Only IN_PROGRESS → COMPLETED transition allowed via complete() (Batch must be COMPLETED – enforced by Use Case)
- * 11. Only PLANNED or RELEASED → CANCELLED transition allowed via cancel()
+ * 11. Only PLANNED or RELEASED → CANCELLED transition allowed via cancel(reason)
+ * 12. CancelledReason is set exactly once during cancel() and must not be blank
  */
 public class ProductionOrder {
 
@@ -35,6 +36,7 @@ public class ProductionOrder {
     private final LocalDate plannedDate;
     private final Priority priority;
     private final String notes;
+    private String cancelledReason;
     private final OffsetDateTime createdAt;
     private OffsetDateTime updatedAt;
     private final long version;
@@ -48,6 +50,7 @@ public class ProductionOrder {
             LocalDate plannedDate,
             Priority priority,
             String notes,
+            String cancelledReason,
             OffsetDateTime createdAt,
             OffsetDateTime updatedAt,
             long version
@@ -60,6 +63,7 @@ public class ProductionOrder {
         this.plannedDate = plannedDate;
         this.priority = priority;
         this.notes = notes;
+        this.cancelledReason = cancelledReason;
         this.createdAt = createdAt;
         this.updatedAt = updatedAt;
         this.version = version;
@@ -120,6 +124,7 @@ public class ProductionOrder {
                 draft.plannedDate(),
                 priority,
                 draft.notes(),
+                null,
                 now,
                 now,
                 0L
@@ -135,12 +140,13 @@ public class ProductionOrder {
             LocalDate plannedDate,
             Priority priority,
             String notes,
+            String cancelledReason,
             OffsetDateTime createdAt,
             OffsetDateTime updatedAt,
             long version
     ) {
         return new ProductionOrder(id, recipeId, status, batchId, plannedQuantity, plannedDate,
-                priority, notes, createdAt, updatedAt, version);
+                priority, notes, cancelledReason, createdAt, updatedAt, version);
     }
 
     public ProductionOrderId id() { return id; }
@@ -151,6 +157,7 @@ public class ProductionOrder {
     public LocalDate plannedDate() { return plannedDate; }
     public Priority priority() { return priority; }
     public String notes() { return notes; }
+    public String cancelledReason() { return cancelledReason; }
     public OffsetDateTime createdAt() { return createdAt; }
     public OffsetDateTime updatedAt() { return updatedAt; }
     public long version() { return version; }
@@ -186,11 +193,15 @@ public class ProductionOrder {
         return Result.success(null);
     }
 
-    public Result<ProductionOrderError, Void> cancel() {
+    public Result<ProductionOrderError, Void> cancel(String reason) {
+        if (reason == null || reason.isBlank()) {
+            return Result.failure(new ProductionOrderError.ValidationFailure("Cancellation reason must not be blank"));
+        }
         if (status != ProductionOrderStatus.PLANNED && status != ProductionOrderStatus.RELEASED) {
             return Result.failure(new ProductionOrderError.InvalidStatusTransition(status, ProductionOrderStatus.CANCELLED));
         }
         this.status = ProductionOrderStatus.CANCELLED;
+        this.cancelledReason = reason;
         this.updatedAt = OffsetDateTime.now(ZoneOffset.UTC);
         return Result.success(null);
     }

backend/src/main/java/de/effigenix/infrastructure/production/persistence/JdbcProductionOrderRepository.java

@@ -62,7 +62,8 @@ public class JdbcProductionOrderRepository implements ProductionOrderRepository
             int rows = jdbc.sql("""
                     UPDATE production_orders
                     SET status = :status, batch_id = :batchId, priority = :priority,
-                        notes = :notes, updated_at = :updatedAt, version = version + 1
+                        notes = :notes, cancelled_reason = :cancelledReason,
+                        updated_at = :updatedAt, version = version + 1
                     WHERE id = :id AND version = :version
                     """)
                     .param("id", order.id().value())
@@ -70,6 +71,7 @@ public class JdbcProductionOrderRepository implements ProductionOrderRepository
                     .param("batchId", order.batchId() != null ? order.batchId().value() : null)
                     .param("priority", order.priority().name())
                     .param("notes", order.notes())
+                    .param("cancelledReason", order.cancelledReason())
                     .param("updatedAt", order.updatedAt())
                     .param("version", order.version())
                     .update();
@@ -88,9 +90,11 @@ public class JdbcProductionOrderRepository implements ProductionOrderRepository
                 jdbc.sql("""
                         INSERT INTO production_orders
                         (id, recipe_id, status, planned_quantity_amount, planned_quantity_unit,
-                         planned_date, priority, batch_id, notes, created_at, updated_at, version)
+                         planned_date, priority, batch_id, notes, cancelled_reason,
+                         created_at, updated_at, version)
                         VALUES (:id, :recipeId, :status, :plannedQuantityAmount, :plannedQuantityUnit,
-                                :plannedDate, :priority, :batchId, :notes, :createdAt, :updatedAt, 0)
+                                :plannedDate, :priority, :batchId, :notes, :cancelledReason,
+                                :createdAt, :updatedAt, 0)
                         """)
                         .param("id", order.id().value())
                         .param("recipeId", order.recipeId().value())
@@ -101,6 +105,7 @@ public class JdbcProductionOrderRepository implements ProductionOrderRepository
                         .param("priority", order.priority().name())
                         .param("batchId", order.batchId() != null ? order.batchId().value() : null)
                         .param("notes", order.notes())
+                        .param("cancelledReason", order.cancelledReason())
                         .param("createdAt", order.createdAt())
                         .param("updatedAt", order.updatedAt())
                         .update();
@@ -126,6 +131,7 @@ public class JdbcProductionOrderRepository implements ProductionOrderRepository
                 rs.getObject("planned_date", java.time.LocalDate.class),
                 Priority.valueOf(rs.getString("priority")),
                 rs.getString("notes"),
+                rs.getString("cancelled_reason"),
                 rs.getObject("created_at", OffsetDateTime.class),
                 rs.getObject("updated_at", OffsetDateTime.class),
                 rs.getLong("version")

backend/src/main/java/de/effigenix/infrastructure/production/web/dto/ProductionOrderResponse.java

@@ -15,6 +15,7 @@ public record ProductionOrderResponse(
         LocalDate plannedDate,
         String priority,
         String notes,
+        String cancelledReason,
         OffsetDateTime createdAt,
         OffsetDateTime updatedAt
 ) {
@@ -29,6 +30,7 @@ public record ProductionOrderResponse(
                 order.plannedDate(),
                 order.priority().name(),
                 order.notes(),
+                order.cancelledReason(),
                 order.createdAt(),
                 order.updatedAt()
         );

backend/src/main/resources/db/changelog/changes/033-add-cancelled-reason-to-production-orders.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<databaseChangeLog
+        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd">
+
+    <changeSet id="033-add-cancelled-reason-to-production-orders" author="effigenix">
+        <addColumn tableName="production_orders">
+            <column name="cancelled_reason" type="VARCHAR(1000)">
+                <constraints nullable="true"/>
+            </column>
+        </addColumn>
+    </changeSet>
+
+</databaseChangeLog>

backend/src/main/resources/db/changelog/db.changelog-master.xml

@@ -37,5 +37,6 @@
     <include file="db/changelog/changes/030-add-batch-id-index-to-stock-movements.xml"/>
 
     <include file="db/changelog/changes/032-add-batch-id-to-production-orders.xml"/>
+    <include file="db/changelog/changes/033-add-cancelled-reason-to-production-orders.xml"/>
 
 </databaseChangeLog>