chore: Add cleanup and update stage for tenant at the server restart

app/server/appsmith-server/src/main/java/com/appsmith/server/configurations/TenantConfig.java

@@ -0,0 +1,39 @@
+package com.appsmith.server.configurations;
+
+import com.appsmith.server.domains.Tenant;
+import com.appsmith.server.helpers.CollectionUtils;
+import com.appsmith.server.services.TenantService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.context.event.ApplicationStartedEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.annotation.Configuration;
+import reactor.core.publisher.Mono;
+
+import static com.appsmith.external.models.BaseDomain.policySetToMap;
+
+@Configuration
+@RequiredArgsConstructor
+@Slf4j
+public class TenantConfig implements ApplicationListener<ApplicationStartedEvent> {
+
+    private final TenantService tenantService;
+
+    // Method to cleanup the cache and update the default tenant policies if the policyMap is empty. This will make sure
+    // cache will be updated if we update the tenant via startup DB migrations.
+    private Mono<Tenant> cleanupAndUpdateRefreshDefaultTenantPolicies() {
+        log.debug("Cleaning up and updating default tenant policies on server startup");
+        return tenantService.getDefaultTenant().flatMap(tenant -> {
+            if (CollectionUtils.isNullOrEmpty(tenant.getPolicyMap())) {
+                tenant.setPolicyMap(policySetToMap(tenant.getPolicies()));
+                return tenantService.save(tenant);
+            }
+            return Mono.just(tenant);
+        });
+    }
+
+    @Override
+    public void onApplicationEvent(ApplicationStartedEvent event) {
+        cleanupAndUpdateRefreshDefaultTenantPolicies().block();
+    }
+}