S16 postgresql opslag added

agiledancers-fe/src/app/shared/school-transfer.ts

@@ -10,6 +10,7 @@ interface Preview {
   shows: number;
   existingId: number | null;
   existingName: string | null;
+  existingRevision: number | null;
 }
 @Component({
   selector: 'app-school-transfer',
@@ -117,7 +118,12 @@ export class SchoolTransfer {
       const query = p.existingId === null ? '' : `?replaceId=${p.existingId}`;
       await firstValueFrom(
         this.http.post(`${this.base}/import${query}`, this.json, {
-          headers: { 'Content-Type': 'application/json' },
+          headers: {
+            'Content-Type': 'application/json',
+            ...(p.existingRevision === null
+              ? {}
+              : { 'X-School-Revision': String(p.existingRevision) }),
+          },
         }),
       );
       this.cancel();