Fix TS2531: Object is possibly null for rowCount

- rmq.service.ts: Use ?? 0 to handle nullable rowCount
- postgres-server.ts: Use ?? 0 to handle nullable rowCount

Author: Hermes Agent (gankoji-openclaw)

common/src/events/rmq.service.ts

@@ -125,7 +125,7 @@ export class RmqService {
             `,
             [daysToKeep],
         );
-        if (result.rowCount > 0) {
+        if ((result.rowCount ?? 0) > 0) {
             this.logger.log(`Cleaned up ${result.rowCount} old events older than ${daysToKeep} days`);
         }
         return result.rowCount ?? 0;

common/src/postgres-transport/postgres-server.ts

@@ -72,7 +72,7 @@ export class PostgresServer extends Server implements CustomTransportStrategy {
                     `,
                     [Math.ceil(this.staleMessageTimeoutMs / 1000)],
                 );
-                if (result.rowCount > 0) {
+                if ((result.rowCount ?? 0) > 0) {
                     this.logger.warn(`Reset ${result.rowCount} stale processing messages to pending`);
                 }
             } catch (error) {