Initial commit: sap-legacy-webhook-emulator

Reconstruye el Webhook Messenger nativo de SAP B1 (FP2605) para
clientes que aun no estan en esa version: captura eventos via
SBO_SP_PostTransactionNotice, provisiona UserTables OEVC/EVC1/OEVN/EVN1
y despacha CloudEvents al mismo endpoint que el messenger real.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/dispatcher/oevn-repository.ts

@@ -0,0 +1,44 @@
+import type { ServiceLayerClient } from '../service-layer-client.ts';
+import { userTableEntity } from '../lib/service-layer-paths.ts';
+
+const ENTITY = userTableEntity('OEVN');
+
+export interface OevnRow {
+  code: string;
+  sourceDb: string;
+  status: string;
+  objectType: string;
+  transType: string;
+  fieldNames: string;
+  fieldValue: string;
+}
+
+function toRow(raw: Record<string, unknown>): OevnRow {
+  return {
+    code: raw.Code as string,
+    sourceDb: raw.U_SourceDB as string,
+    status: raw.U_Status as string,
+    objectType: raw.U_ObjectType as string,
+    transType: raw.U_TransType as string,
+    fieldNames: raw.U_FieldNames as string,
+    fieldValue: raw.U_FieldValue as string,
+  };
+}
+
+export async function listNewEvents(client: ServiceLayerClient): Promise<OevnRow[]> {
+  const rows = await client.getAll(`/${ENTITY}?$filter=${encodeURIComponent("U_Status eq 'N'")}`);
+  return rows.map(toRow);
+}
+
+export async function getEvent(client: ServiceLayerClient, code: string): Promise<OevnRow | null> {
+  const res = await client.get(`/${ENTITY}('${code}')`);
+  return res.status === 200 ? toRow(res.data) : null;
+}
+
+export async function deleteEvent(client: ServiceLayerClient, code: string): Promise<void> {
+  await client.delete(`/${ENTITY}('${code}')`);
+}
+
+export async function setEventStatus(client: ServiceLayerClient, code: string, status: string): Promise<void> {
+  await client.patch(`/${ENTITY}('${code}')`, { U_Status: status });
+}