feat: add AI catalog description generation

backend/src/catalog/postgres-access.ts

@@ -180,13 +180,17 @@ export class ConcreteCatalogPostgresAccess implements CatalogPostgresAccess {
       materialized.release();
     };
     const abort = () => { void close(); };
+    signal.addEventListener("abort", abort, { once: true });
 
     try {
+      if (signal.aborted) throw new CatalogConnectorError("PostgreSQL connector aborted");
       const passwordFile = materialized.files.get(CATALOG_SECRET_IDS.password);
       if (!passwordFile) throw new CatalogConnectorError("Database password is not configured");
       const password = await readFile(passwordFile, "utf8");
+      if (signal.aborted) throw new CatalogConnectorError("PostgreSQL connector aborted");
       const tlsCaFile = materialized.files.get(CATALOG_SECRET_IDS.tlsCa);
       const tlsCa = tlsCaFile ? await readFile(tlsCaFile, "utf8") : undefined;
+      if (signal.aborted) throw new CatalogConnectorError("PostgreSQL connector aborted");
       let host: string;
       let port: number;
 
@@ -243,8 +247,8 @@ export class ConcreteCatalogPostgresAccess implements CatalogPostgresAccess {
         connectionTimeoutMillis: this.connectTimeoutMs,
         ...(stream ? { stream: () => stream } : {}),
       });
-      signal.addEventListener("abort", abort, { once: true });
       await client.connect();
+      if (signal.aborted) throw new CatalogConnectorError("PostgreSQL connector aborted");
       return {
         query: async (sql, values) => await client!.query(sql, [...values]),
         end: close,