diff --git a/.gitignore b/.gitignore
index c9064be..9580abc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,7 +41,7 @@ build/
 
 temp/
 
-datasets
+ml_new/datasets/
 
 mutagen.yml
 
diff --git a/.idea/data_source_mapping.xml b/.idea/data_source_mapping.xml
index 7bc8724..7ba958c 100644
--- a/.idea/data_source_mapping.xml
+++ b/.idea/data_source_mapping.xml
@@ -4,6 +4,7 @@
     <file url="file://$PROJECT_DIR$/packages/crawler/db/snapshot.ts" value="0d2dd3d3-bd27-4e5f-b0fa-ff14fb2a6bef" />
     <file url="file://$PROJECT_DIR$/packages/crawler/mq/task/removeAllTimeoutSchedules.ts" value="0d2dd3d3-bd27-4e5f-b0fa-ff14fb2a6bef" />
     <file url="file://$PROJECT_DIR$/queries/schedule_count.sql" value="0d2dd3d3-bd27-4e5f-b0fa-ff14fb2a6bef" />
+    <file url="file://$PROJECT_DIR$/queries/schedule_window.sql" value="0d2dd3d3-bd27-4e5f-b0fa-ff14fb2a6bef" />
     <file url="file://$PROJECT_DIR$/queries/snapshots_count.sql" value="0d2dd3d3-bd27-4e5f-b0fa-ff14fb2a6bef" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/sqldialects.xml b/.idea/sqldialects.xml
index bf5df38..01b4ad0 100644
--- a/.idea/sqldialects.xml
+++ b/.idea/sqldialects.xml
@@ -2,6 +2,7 @@
 <project version="4">
   <component name="SqlDialectMappings">
     <file url="file://$PROJECT_DIR$/queries/schedule_count.sql" dialect="PostgreSQL" />
+    <file url="file://$PROJECT_DIR$/queries/schedule_window.sql" dialect="PostgreSQL" />
     <file url="file://$PROJECT_DIR$/queries/snapshots_count.sql" dialect="PostgreSQL" />
     <file url="PROJECT" dialect="PostgreSQL" />
   </component>
diff --git a/packages/core/net/delegate.ts b/packages/core/net/delegate.ts
index b48cfb9..ae01cd8 100644
--- a/packages/core/net/delegate.ts
+++ b/packages/core/net/delegate.ts
@@ -14,7 +14,12 @@ import * as OpenApi from "@alicloud/openapi-client";
 import Stream from "@alicloud/darabonba-stream";
 import * as Util from "@alicloud/tea-util";
 import { Readable } from "stream";
-import { ipProxyCounter, ipProxyErrorCounter } from "crawler/metrics";
+import {
+	aliFCCounter,
+	aliFCErrorCounter,
+	ipProxyCounter,
+	ipProxyErrorCounter
+} from "crawler/metrics";
 
 type ProxyType = "native" | "alicloud-fc" | "ip-proxy";
 
@@ -425,7 +430,14 @@ export class NetworkDelegate<const C extends NetworkConfig> {
 						"ALICLOUD_PROXY_ERR"
 					);
 				}
-				return await this.alicloudFcRequest<R>(url, proxy.data);
+				try {
+					return await this.alicloudFcRequest<R>(url, proxy.data);
+				} catch (e) {
+					aliFCErrorCounter.add(1);
+					throw e;
+				} finally {
+					aliFCCounter.add(1);
+				}
 			case "ip-proxy":
 				if (!isIpProxy(proxy)) {
 					throw new NetSchedulerError(
@@ -526,7 +538,7 @@ export class NetworkDelegate<const C extends NetworkConfig> {
 		}
 
 		const ipPool = this.ipPools[proxyName];
-		const maxRetries = 3;
+		const maxRetries = 5;
 
 		let lastError: Error | null = null;
 
@@ -691,12 +703,10 @@ const config = {
 		snapshotVideo: {
 			provider: "bilibili",
 			proxies: ["ip_proxy_pool"],
-			limiters: bili_normal
 		},
 		bulkSnapshot: {
 			provider: "bilibili",
 			proxies: ["ip_proxy_pool"],
-			limiters: bili_strict
 		}
 	}
 } as const satisfies NetworkConfig;
diff --git a/packages/crawler/metrics/index.ts b/packages/crawler/metrics/index.ts
index 8e20b56..af9432e 100644
--- a/packages/crawler/metrics/index.ts
+++ b/packages/crawler/metrics/index.ts
@@ -25,6 +25,14 @@ export const ipProxyErrorCounter = anotherMeter.createCounter("ip_proxy_error_co
 	description: "Number of errors thrown by IP proxy"
 });
 
+export const aliFCCounter = anotherMeter.createCounter("ali_fc_count", {
+	description: "Number of requests using Ali FC"
+});
+
+export const aliFCErrorCounter = anotherMeter.createCounter("ali_fc_error_count", {
+	description: "Number of errors thrown by Ali FC"
+});
+
 export const jobCounter = meter.createCounter("job_count", {
 	description: "Number of executed BullMQ jobs"
 });
diff --git a/queries/schedule_window.sql b/queries/schedule_window.sql
new file mode 100644
index 0000000..c4c7163
--- /dev/null
+++ b/queries/schedule_window.sql
@@ -0,0 +1,9 @@
+SET TIME ZONE 'Asia/Shanghai';
+SELECT
+    date_trunc('hour', started_at) +
+    (EXTRACT(minute FROM started_at)::int / 5 * INTERVAL '5 minutes') AS window_start,
+    COUNT(*) AS count
+FROM snapshot_schedule
+WHERE started_at >= NOW() - INTERVAL '1 hours' AND status != 'completed' AND started_at <= NOW() + INTERVAL '14 days'
+GROUP BY 1
+ORDER BY window_start
\ No newline at end of file