diff --git a/backend/crates/gateway-core/src/provider_ports.rs b/backend/crates/gateway-core/src/provider_ports.rs
index 8b9bfb594..6255fba9b 100644
--- a/backend/crates/gateway-core/src/provider_ports.rs
+++ b/backend/crates/gateway-core/src/provider_ports.rs
@@ -936,7 +936,7 @@ fn invalid_refresh_policy(operation: &'static str) -> ProviderStoreError {
 }
 
 pub trait ProviderRuntimePolicyPort: Send + Sync {
-    /// 原子领取每日时间槽，跨进程重启与重复本地时刻保持幂等。
+    /// 原子推进预热执行游标，重启或时钟回拨后不重复领取已消费的时刻。
     fn claim_warmup_slot<'a>(
         &'a self,
         _timezone: crate::time::DeploymentTimeZone,
diff --git a/backend/crates/gateway-store/src/postgres/runtime_settings.rs b/backend/crates/gateway-store/src/postgres/runtime_settings.rs
index 2e568dd00..922171f4e 100644
--- a/backend/crates/gateway-store/src/postgres/runtime_settings.rs
+++ b/backend/crates/gateway-store/src/postgres/runtime_settings.rs
@@ -289,25 +289,20 @@ impl ProviderRuntimePolicyPort for PgRuntimeSettingsRepository {
         slot: chrono::NaiveDateTime,
     ) -> futures::future::BoxFuture<'a, Result<bool, ProviderStoreError>> {
         Box::pin(async move {
-            let mut transaction = self
-                .pool
-                .begin()
-                .await
-                .map_err(|_| provider_unavailable("claim warmup slot"))?;
-            // 去重只需覆盖近期开关、重启与回拨，保留七天后由下一次领取回收。
-            sqlx::query(
-                "delete from account_warmup_slots where claimed_at < now() - interval '7 days'",
+            let slot = timezone.resolve_local(slot).ok_or_else(|| {
+                ProviderStoreError::new(ProviderStoreErrorKind::InvalidData, "resolve warmup slot")
+            })?;
+            // 执行游标只向前推进；设置保存不覆盖它，领取也不发布新的配置版本。
+            let claimed = sqlx::query(
+                "update runtime_settings set account_warmup_cursor = $1
+                 where id = 1 and (account_warmup_cursor is null or account_warmup_cursor < $1)",
             )
-            .execute(&mut *transaction)
+            .bind(slot)
+            .execute(&self.pool)
             .await
-            .map_err(|_| provider_unavailable("cleanup warmup slots"))?;
-            let claimed = sqlx::query("insert into account_warmup_slots (timezone, local_slot) values ($1, $2) on conflict do nothing")
-                .bind(timezone.name()).bind(slot).execute(&mut *transaction).await
-                .map_err(|_| provider_unavailable("claim warmup slot"))?.rows_affected() == 1;
-            transaction
-                .commit()
-                .await
-                .map_err(|_| provider_unavailable("commit warmup slot"))?;
+            .map_err(|_| provider_unavailable("claim warmup slot"))?
+            .rows_affected()
+                == 1;
             Ok(claimed)
         })
     }
diff --git a/backend/crates/gateway-store/tests/postgres/mod.rs b/backend/crates/gateway-store/tests/postgres/mod.rs
index eac173a9c..e8773f573 100644
--- a/backend/crates/gateway-store/tests/postgres/mod.rs
+++ b/backend/crates/gateway-store/tests/postgres/mod.rs
@@ -234,7 +234,6 @@ async fn connect_and_migrate_should_apply_all_migrations_once_and_reopen_cleanly
             "_sqlx_migrations",
             "account_group_accounts",
             "account_groups",
-            "account_warmup_slots",
             "admin_audit_events",
             "admin_users",
             "authorization_receipts",
diff --git a/backend/crates/gateway-store/tests/postgres/runtime_settings.rs b/backend/crates/gateway-store/tests/postgres/runtime_settings.rs
index 31db79e8d..59c0c9b45 100644
--- a/backend/crates/gateway-store/tests/postgres/runtime_settings.rs
+++ b/backend/crates/gateway-store/tests/postgres/runtime_settings.rs
@@ -904,9 +904,9 @@ async fn control_plane_replacement_commits_one_writer_per_revision_and_preserves
 }
 
 #[tokio::test]
-async fn warmup_slots_survive_restart_and_serialize_competing_claims() {
+async fn warmup_cursor_survives_restart_and_settings_updates_without_rewinding() {
     use gateway_core::{provider_ports::ProviderRuntimePolicyPort, time::DeploymentTimeZone};
-    let Some(database) = TestDatabase::create("warmup_slots").await else {
+    let Some(database) = TestDatabase::create("warmup_cursor").await else {
         return;
     };
     let zone = DeploymentTimeZone::default();
@@ -917,11 +917,15 @@ async fn warmup_slots_survive_restart_and_serialize_competing_claims() {
         .unwrap();
     let first = PgRuntimeSettingsRepository::new(database.pool.clone());
     let second = PgRuntimeSettingsRepository::new(database.pool.clone());
+    let before = first.load_runtime_settings().await.unwrap();
     let (a, b) = tokio::join!(
         first.claim_warmup_slot(zone, slot),
         second.claim_warmup_slot(zone, slot)
     );
-    assert_ne!(a.unwrap(), b.unwrap(), "one leader claims the local minute");
+    assert_ne!(a.unwrap(), b.unwrap(), "the local minute is claimed once");
+    let after = first.load_runtime_settings().await.unwrap();
+    assert_eq!(after.config_revision, before.config_revision);
+    assert_eq!(after.updated_at, before.updated_at);
     let restarted = PgRuntimeSettingsRepository::new(database.pool.clone());
     assert!(!restarted.claim_warmup_slot(zone, slot).await.unwrap());
     assert!(
@@ -934,15 +938,104 @@ async fn warmup_slots_survive_restart_and_serialize_competing_claims() {
         !restarted.claim_warmup_slot(zone, slot).await.unwrap(),
         "another slot cannot erase prior deduplication"
     );
-    sqlx::query("update account_warmup_slots set claimed_at = now() - interval '8 days'")
-        .execute(&database.pool)
+    restarted
+        .update_runtime_settings(settings_with_margin(3600))
         .await
         .unwrap();
-    assert!(restarted.claim_warmup_slot(zone, slot).await.unwrap());
-    let count: i64 = sqlx::query_scalar("select count(*) from account_warmup_slots")
-        .fetch_one(&database.pool)
+    assert!(!restarted.claim_warmup_slot(zone, slot).await.unwrap());
+    assert!(
+        !restarted
+            .claim_warmup_slot(zone, slot - TimeDelta::hours(1))
+            .await
+            .unwrap(),
+        "clock rollback cannot replay an earlier time slot"
+    );
+    assert!(
+        restarted
+            .claim_warmup_slot(zone, slot + TimeDelta::days(1))
+            .await
+            .unwrap()
+    );
+    database.close().await;
+}
+
+#[tokio::test]
+async fn runtime_scheduling_upgrade_preserves_settings_without_a_warmup_table() {
+    let Some(database) = TestDatabase::create_through("runtime_scheduling_upgrade", 20).await
+    else {
+        return;
+    };
+    sqlx::query(
+        "update runtime_settings set rotation_strategy = 'sticky',
+         account_warmup_enabled = true, account_warmup_schedule_time = '08:00,13:00',
+         account_warmup_model = 'test-model' where id = 1",
+    )
+    .execute(&database.pool)
+    .await
+    .unwrap();
+    super::TEST_MIGRATOR.run(&database.pool).await.unwrap();
+    let warmup_table: Option<String> =
+        sqlx::query_scalar("select to_regclass('account_warmup_slots')::text")
+            .fetch_one(&database.pool)
+            .await
+            .unwrap();
+    assert!(warmup_table.is_none());
+    let cursor: Option<DateTime<Utc>> =
+        sqlx::query_scalar("select account_warmup_cursor from runtime_settings where id = 1")
+            .fetch_one(&database.pool)
+            .await
+            .unwrap();
+    assert!(cursor.is_none());
+    let settings = PgRuntimeSettingsRepository::new(database.pool.clone())
+        .load_runtime_settings()
         .await
         .unwrap();
-    assert_eq!(count, 1, "expired deduplication state is reclaimed");
+    assert_eq!(settings.rotation_strategy, "sticky");
+    assert!(settings.account_warmup_enabled);
+    assert_eq!(settings.account_warmup_schedule_time, "08:00,13:00");
+    assert_eq!(settings.account_warmup_model.as_deref(), Some("test-model"));
+    assert_eq!(settings.openai_guardian_reserved_concurrency, 0);
+    database.close().await;
+}
+
+#[tokio::test]
+async fn warmup_cursor_resolves_dst_and_deduplicates_across_timezones() {
+    use gateway_core::{provider_ports::ProviderRuntimePolicyPort, time::DeploymentTimeZone};
+    let Some(database) = TestDatabase::create("warmup_cursor_dst").await else {
+        return;
+    };
+    let repository = PgRuntimeSettingsRepository::new(database.pool.clone());
+    let zone: DeploymentTimeZone = "America/New_York".parse().unwrap();
+    let slot = chrono::NaiveDate::from_ymd_opt(2026, 11, 1)
+        .unwrap()
+        .and_hms_opt(1, 30, 0)
+        .unwrap();
+    assert!(repository.claim_warmup_slot(zone, slot).await.unwrap());
+    let cursor: DateTime<Utc> =
+        sqlx::query_scalar("select account_warmup_cursor from runtime_settings where id = 1")
+            .fetch_one(&database.pool)
+            .await
+            .unwrap();
+    assert_eq!(
+        cursor,
+        "2026-11-01T05:30:00Z".parse::<DateTime<Utc>>().unwrap()
+    );
+    assert!(!repository.claim_warmup_slot(zone, slot).await.unwrap());
+    // 回拨中的重复本地时刻取较早一次，不能误挡后一分的正常调度。
+    let next = slot + TimeDelta::minutes(1);
+    assert!(repository.claim_warmup_slot(zone, next).await.unwrap());
+    let utc: DeploymentTimeZone = "UTC".parse().unwrap();
+    assert!(
+        !repository
+            .claim_warmup_slot(utc, zone.resolve_local(next).unwrap().naive_utc())
+            .await
+            .unwrap(),
+        "changing the deployment timezone cannot reclaim the same instant"
+    );
+    let missing = chrono::NaiveDate::from_ymd_opt(2026, 3, 8)
+        .unwrap()
+        .and_hms_opt(2, 30, 0)
+        .unwrap();
+    assert!(repository.claim_warmup_slot(zone, missing).await.is_err());
     database.close().await;
 }
diff --git a/backend/crates/providers/openai/src/provider/workers.rs b/backend/crates/providers/openai/src/provider/workers.rs
index 7ede78590..adfd79d48 100644
--- a/backend/crates/providers/openai/src/provider/workers.rs
+++ b/backend/crates/providers/openai/src/provider/workers.rs
@@ -429,18 +429,6 @@ impl ScheduledTask for OpenAiWarmupTask {
                     tracing::warn!(error = %error, "OpenAI account warmup cycle failed");
                 }
             }
-            let local_after = self.timezone.local(chrono::Utc::now());
-            if local_after.date_naive() == local_now.date_naive()
-                && local_after.hour() == hour
-                && local_after.minute() == minute
-            {
-                // 持有本轮 leader lease 到时间槽结束，避免其他实例在同一分钟再次执行。
-                let hold = Duration::from_secs(u64::from(61 - local_after.second()));
-                tokio::select! {
-                    () = context.cancellation().cancelled() => return Ok(()),
-                    () = tokio::time::sleep(hold) => {}
-                }
-            }
             Ok(())
         })
     }
diff --git a/backend/migrations/.frozen-sha256 b/backend/migrations/.frozen-sha256
index 8a91c0b7b..b8d6bd210 100644
--- a/backend/migrations/.frozen-sha256
+++ b/backend/migrations/.frozen-sha256
@@ -18,5 +18,4 @@ fcfae912ddefd54551ebf8e7e733442519d2862d2977134d548ebc1e75c1dc34  0017_unlimited
 229c70296764b94fe69c3f19889e566fa290c6c44c64970efe96d7fd2a0008d5  0018_plugins.sql
 40a4d4b16e6ec2c2c659980d416b089fc170acd2255aaaf751c4a04c3790a941  0019_plugin_resources.sql
 e8c1339166ac02fb2d4a077424ee5f64f6dc20eb4d3f8ec4fcb09c0f2a0e61f6  0020_plugin_trust.sql
-338037806358b23dc8b62a39e73b04ce4173c4556383e5df19b7e8c7123924ed  0021_account_warmup_slots.sql
-3b6924605e7e70c074d409611d13f17625f98fae4e9dbe8012a6b3dc3aa1679f  0022_guardian_reserved_concurrency.sql
+22faf2646168275150b1786c0f463f9ff2ca52463a272479e4fcc6f46c8cfa37  0021_runtime_scheduling.sql
diff --git a/backend/migrations/0021_account_warmup_slots.sql b/backend/migrations/0021_account_warmup_slots.sql
deleted file mode 100644
index 46dbe6d00..000000000
--- a/backend/migrations/0021_account_warmup_slots.sql
+++ /dev/null
@@ -1,7 +0,0 @@
--- 每日预激活槽在执行前领取，进程重启与夏令时回拨不会重复发送上游请求。
-create table account_warmup_slots (
-    timezone text not null,
-    local_slot timestamp without time zone not null,
-    claimed_at timestamptz not null default now(),
-    primary key (timezone, local_slot)
-);
diff --git a/backend/migrations/0022_guardian_reserved_concurrency.sql b/backend/migrations/0021_runtime_scheduling.sql
similarity index 78%
rename from backend/migrations/0022_guardian_reserved_concurrency.sql
rename to backend/migrations/0021_runtime_scheduling.sql
index c0e8df9d9..0457216f9 100644
--- a/backend/migrations/0022_guardian_reserved_concurrency.sql
+++ b/backend/migrations/0021_runtime_scheduling.sql
@@ -1,3 +1,4 @@
 alter table runtime_settings
+  add column account_warmup_cursor timestamptz,
   add column openai_guardian_reserved_concurrency bigint not null default 0
     check (openai_guardian_reserved_concurrency between 0 and 4294967295);
diff --git a/docs/api.md b/docs/api.md
index dc9f0c2d2..bb298647b 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -1244,7 +1244,7 @@ accountWarmupModel
 定时账号预热默认关闭。`accountWarmupScheduleTime` 使用部署时区中的 `HH:MM`，
 多个时段以逗号分隔，默认 `08:00`；`accountWarmupModel` 默认 `null`，开启前必须显式选择模型。
 任务面向可用的 OpenAI OAuth 账号，跳过周额度耗尽及五小时窗口距离重置仍超过 30 分钟的账号。
-不存在的本地时刻跳过，重复时刻只执行较早一次；同一本地分钟的去重跨进程重启保留。
+不存在的本地时刻跳过，重复时刻只执行较早一次；执行进度跨重启保留，时钟回拨不补跑已领取时刻之前的时段。
 只有收到响应成功终态才记为预热成功；预热不计入客户端业务用量
 
 `requestLocationEnabled` 是必填布尔值，默认 `false`：关闭时不覆盖客户端原有位置和时区；开启时使用已保存的
diff --git a/docs/architecture.md b/docs/architecture.md
index ae6b5361e..6c40f48f1 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -772,7 +772,8 @@ Worker 由各 Bundle 贡献、由 Host 统一监督：
 - Provider：credential refresh、quota/catalog 健康、账号预热和官方版本/etag 检查
 
 预热与备份按部署时区解释本地时刻，缺失时刻跳过、重复时刻取较早一次。
-预热由 Store 持久领取本地分钟，防止多个时间槽、回拨或重启丢失去重状态；取消仍沿既有 worker lease 生命周期释放。
+预热由 Store 在运行设置记录中持久化 UTC 执行游标，只领取晚于游标的时刻，重启或回拨不重复执行历史时段。
+游标独立于管理配置的替换与版本发布；取消仍沿既有 worker lease 生命周期释放。
 备份设置中的时区仅记录游标来源，切换后从当前时刻重算未来游标，不补跑旧计划。
 游标重算核对启停、Cron、来源时区及旧游标；任务入队与游标推进同事务提交，冲突时只跳过任务