Protect referenced feeder structures from deletion

tests/circuit-group-subtree-project-command.repository.test.ts

@@ -16,6 +16,7 @@ import { circuitSections } from "../src/db/schema/circuit-sections.js";
 import { circuits } from "../src/db/schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../src/db/schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
+import { distributionBoards } from "../src/db/schema/distribution-boards.js";
 import { projectRevisions } from "../src/db/schema/project-revisions.js";
 import { projects } from "../src/db/schema/projects.js";
 import { createCircuitGroupDeleteSubtreeProjectCommand } from "../src/domain/models/circuit-group-subtree-project-command.model.js";
@@ -228,6 +229,45 @@ describe("circuit-group subtree project command", () => {
     }
   });
 
+  it("blocks deleting a group containing a feeding circuit", () => {
+    const context = createTestDatabase();
+    try {
+      const list = context.db.select().from(circuitLists).get()!;
+      const downstream = new DistributionBoardFixtureRepository(
+        context.db
+      ).createWithCircuitListAndDefaultSections("project-1", "Unterverteiler");
+      context.db
+        .update(distributionBoards)
+        .set({
+          feedingDistributionBoardId: list.distributionBoardId,
+          feedingCircuitId: "subtree-circuit",
+        })
+        .where(eq(distributionBoards.id, downstream.id))
+        .run();
+      const repository =
+        new CircuitGroupSubtreeProjectCommandRepository(context.db);
+      const groupId = context.db
+        .select()
+        .from(circuits)
+        .where(eq(circuits.id, "subtree-circuit"))
+        .get()!.sectionId;
+      const snapshot = repository.capture("project-1", groupId);
+
+      assert.throws(
+        () => repository.execute({
+          projectId: "project-1",
+          expectedRevision: 0,
+          source: "user",
+          command: createCircuitGroupDeleteSubtreeProjectCommand(snapshot),
+        }),
+        /Speist Unterverteiler – erst Einspeisung ändern\./
+      );
+      assert.deepEqual(repository.capture("project-1", groupId), snapshot);
+    } finally {
+      context.close();
+    }
+  });
+
   it("rolls back a cascaded deletion when history persistence fails", () => {
     const context = createTestDatabase();
     try {