fix: settle anonymous single-file reservations

migrations/022_anonymous_single_reservations.sql

@@ -0,0 +1,20 @@
+CREATE TABLE anonymous_single_reservations (
+  task_id UUID PRIMARY KEY,
+  session_id VARCHAR(100) NOT NULL,
+  client_ip INET NOT NULL,
+  quota_date DATE NOT NULL,
+  units INTEGER NOT NULL,
+  status VARCHAR(20) NOT NULL DEFAULT 'pending',
+  refund_after TIMESTAMPTZ NOT NULL DEFAULT (NOW() + INTERVAL '15 minutes'),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  settled_at TIMESTAMPTZ,
+  CONSTRAINT anonymous_single_reservations_units_check
+    CHECK (units > 0),
+  CONSTRAINT anonymous_single_reservations_status_check
+    CHECK (status IN ('pending', 'charged', 'refund_pending', 'refunded'))
+);
+
+CREATE INDEX anonymous_single_reservations_unsettled
+  ON anonymous_single_reservations(refund_after, created_at)
+  WHERE status IN ('pending', 'refund_pending');

src/api/compress.rs

@@ -79,6 +79,10 @@ fn default_units_charged() -> i32 {
     1
 }
 
+fn metered_units(charged: bool) -> i32 {
+    i32::from(charged)
+}
+
 fn direct_response<B: IntoResponse>(
     body: B,
     format: ImageFmt,
@@ -264,14 +268,16 @@ async fn compress_json(
         }
     }
 
-    let mut anonymous_reserved = false;
+    let task_id = Uuid::new_v4();
+    let mut anonymous_reservation_date = None;
     let op: Result<CompressResponse, AppError> = (async {
         match &quota_ctx {
             QuotaContext::User(billing) => ensure_quota_available(&state, billing, 1).await?,
             QuotaContext::ApiKey(billing, _) => ensure_quota_available(&state, billing, 1).await?,
             QuotaContext::Anonymous { session_id, ip } => {
-                quota::consume_anonymous_units(&state, session_id, *ip, 1).await?;
+                anonymous_reservation_date = Some(
-                anonymous_reserved = true;
+                    quota::reserve_anonymous_single_unit(&state, task_id, session_id, *ip).await?,
+                );
             }
         }
 
@@ -299,17 +305,15 @@ async fn compress_json(
         } else {
             (saved_bytes as f64) * 100.0 / (original_size as f64)
         };
-        let charge_units = anonymous_reserved
+        let charge_units = quota::output_consumes_unit(
-            || quota::output_consumes_unit(
+            req.compression_rate,
-                req.compression_rate,
+            format_in == format_out,
-                format_in == format_out,
+            req.max_width.is_some() || req.max_height.is_some(),
-                req.max_width.is_some() || req.max_height.is_some(),
+            req.target_size_bytes.is_some(),
-                req.target_size_bytes.is_some(),
+            original_size,
-                original_size,
+            compressed_size,
-                compressed_size,
+        );
-            );
 
-        let task_id = Uuid::new_v4();
         let file_id = Uuid::new_v4();
         let retention_hours = retention.num_hours();
         let object_key =
@@ -356,6 +360,17 @@ async fn compress_json(
             return Err(err);
         }
 
+        if anonymous_reservation_date.is_some() {
+            if let Err(err) =
+                quota::finalize_anonymous_single_reservation(&state, task_id, charge_units).await
+            {
+                // The durable reservation remains visible to maintenance, so a
+                // transient Redis failure must not turn a successful image into
+                // a failed, non-idempotent request.
+                tracing::warn!(task_id = %task_id, charged = charge_units, error = %err, "anonymous single reservation finalization deferred");
+            }
+        }
+
         Ok(CompressResponse {
             task_id,
             file_id,
@@ -368,7 +383,7 @@ async fn compress_json(
             download_url: format!("/downloads/{file_id}"),
             expires_at,
             billing: BillingView {
-                units_charged: if charge_units { 1 } else { 0 },
+                units_charged: metered_units(charge_units),
             },
         })
     })
@@ -402,9 +417,11 @@ async fn compress_json(
             ))
         }
         Err(err) => {
-            if anonymous_reserved {
+            if anonymous_reservation_date.is_some() {
-                if let QuotaContext::Anonymous { session_id, ip } = &quota_ctx {
+                if let Err(refund_err) =
-                    let _ = quota::refund_anonymous_units(&state, session_id, *ip, 1).await;
+                    quota::refund_anonymous_single_reservation(&state, task_id).await
+                {
+                    tracing::warn!(task_id = %task_id, error = %refund_err, "anonymous single reservation refund deferred");
                 }
             }
             if let (Some(scope), Some(idem_key), Some(request_hash)) = (
@@ -653,7 +670,7 @@ async fn compress_direct(
             compressed_size,
             saved_bytes,
             saved_percent,
-            units_charged: if charge_units { 1 } else { 0 },
+            units_charged: metered_units(charge_units),
         };
         let response = direct_response(compressed, format_out, &idem_data);
         Ok((response, idem_data))
@@ -1137,7 +1154,9 @@ async fn record_task_and_metering(
     .map_err(|err| AppError::new(ErrorCode::Internal, "创建文件记录失败").with_source(err))?;
 
     match quota_ctx {
-        QuotaContext::Anonymous { .. } => {}
+        QuotaContext::Anonymous { .. } => {
+            quota::mark_anonymous_single_result(&mut tx, task_id, charge_units).await?;
+        }
         QuotaContext::User(billing) => {
             if charge_units {
                 charge_one_unit(
@@ -1247,4 +1266,34 @@ mod tests {
         assert_eq!(response.headers()["imageforge-saved-percent"], "37.50");
         assert_eq!(response.headers()["imageforge-units-charged"], "1");
     }
+
+    #[test]
+    fn anonymous_response_units_follow_actual_output_metering() {
+        let cases = [
+            (Some(100), true, false, false, 100, 50, 0),
+            (None, true, false, false, 100, 100, 0),
+            (None, true, false, false, 100, 50, 1),
+            (Some(100), true, true, false, 100, 50, 1),
+        ];
+        for (
+            compression_rate,
+            same_format,
+            has_resize,
+            has_target_size,
+            original_size,
+            output_size,
+            expected_units,
+        ) in cases
+        {
+            let charged = quota::output_consumes_unit(
+                compression_rate,
+                same_format,
+                has_resize,
+                has_target_size,
+                original_size,
+                output_size,
+            );
+            assert_eq!(metered_units(charged), expected_units);
+        }
+    }
 }

src/services/quota.rs

@@ -320,55 +320,257 @@ pub async fn reserve_anonymous_units(
     Ok(date)
 }
 
-pub async fn refund_anonymous_units(
+pub async fn reserve_anonymous_single_unit(
     state: &AppState,
+    task_id: Uuid,
     session_id: &str,
     ip: IpAddr,
-    units: u32,
+) -> Result<NaiveDate, AppError> {
-) -> Result<(), AppError> {
+    reserve_anonymous_single_unit_for_date(state, task_id, session_id, ip, utc8_date()).await
-    refund_anonymous_units_for_date(state, session_id, ip, utc8_date(), units).await
 }
 
-async fn refund_anonymous_units_for_date(
+async fn reserve_anonymous_single_unit_for_date(
     state: &AppState,
+    task_id: Uuid,
     session_id: &str,
     ip: IpAddr,
     date: NaiveDate,
-    units: u32,
+) -> Result<NaiveDate, AppError> {
-) -> Result<(), AppError> {
+    sqlx::query(
-    if units == 0 {
+        r#"
-        return Ok(());
+        INSERT INTO anonymous_single_reservations (
-    }
+          task_id, session_id, client_ip, quota_date, units
+        ) VALUES ($1, $2, $3::inet, $4, 1)
+        "#,
+    )
+    .bind(task_id)
+    .bind(session_id)
+    .bind(ip.to_string())
+    .bind(date)
+    .execute(&state.db)
+    .await
+    .map_err(|err| AppError::new(ErrorCode::Internal, "创建匿名单文件预留失败").with_source(err))?;
 
+    let limit = crate::services::settings::runtime_policy(state)
+        .await?
+        .rate_limits
+        .anonymous_units_per_day as i64;
     let session_key = anonymous_session_key(session_id, date);
     let ip_key = anonymous_ip_key(ip, date);
+    let reservation_key = anonymous_single_reservation_key(task_id);
+    let mut conn = state.redis.clone();
+    let script = redis::Script::new(
+        r#"
+        local limit = tonumber(ARGV[1])
+        local ttl = tonumber(ARGV[2])
+
+        if redis.call('EXISTS', KEYS[3]) == 1 then
+          return tonumber(redis.call('GET', KEYS[1]) or '0')
+        end
+
+        local session_value = tonumber(redis.call('GET', KEYS[1]) or '0')
+        local ip_value = tonumber(redis.call('GET', KEYS[2]) or '0')
+        if session_value + 1 > limit or ip_value + 1 > limit then
+          return -1
+        end
+
+        session_value = redis.call('INCRBY', KEYS[1], 1)
+        ip_value = redis.call('INCRBY', KEYS[2], 1)
+        if session_value == 1 then redis.call('EXPIRE', KEYS[1], ttl) end
+        if ip_value == 1 then redis.call('EXPIRE', KEYS[2], ttl) end
+        redis.call('SET', KEYS[3], '1', 'EX', ttl)
+        return session_value
+        "#,
+    );
+    let reserved: i64 = script
+        .key(session_key)
+        .key(ip_key)
+        .key(reservation_key)
+        .arg(limit)
+        .arg(48 * 60 * 60)
+        .invoke_async(&mut conn)
+        .await
+        .map_err(|err| {
+            // Keep the durable pending row: the script may have committed even
+            // if the response was lost, and maintenance can safely reconcile it.
+            AppError::new(ErrorCode::Internal, "匿名配额检查失败").with_source(err)
+        })?;
+    if reserved < 0 {
+        sqlx::query(
+            r#"
+            UPDATE anonymous_single_reservations
+            SET status = 'refunded', settled_at = NOW(), updated_at = NOW()
+            WHERE task_id = $1 AND status = 'pending'
+            "#,
+        )
+        .bind(task_id)
+        .execute(&state.db)
+        .await
+        .map_err(|err| {
+            AppError::new(ErrorCode::Internal, "关闭匿名单文件预留失败").with_source(err)
+        })?;
+        return Err(AppError::new(
+            ErrorCode::QuotaExceeded,
+            format!("匿名试用次数已用完（每日 {limit} 次）"),
+        ));
+    }
+    Ok(date)
+}
+
+pub async fn mark_anonymous_single_result(
+    tx: &mut sqlx::Transaction<'_, sqlx::Postgres>,
+    task_id: Uuid,
+    charged: bool,
+) -> Result<(), AppError> {
+    let status = if charged { "charged" } else { "refund_pending" };
+    let updated = sqlx::query(
+        r#"
+        UPDATE anonymous_single_reservations
+        SET status = $2,
+            settled_at = CASE WHEN $2 = 'charged' THEN NOW() ELSE settled_at END,
+            updated_at = NOW()
+        WHERE task_id = $1 AND status = 'pending'
+        "#,
+    )
+    .bind(task_id)
+    .bind(status)
+    .execute(&mut **tx)
+    .await
+    .map_err(|err| AppError::new(ErrorCode::Internal, "更新匿名单文件预留失败").with_source(err))?;
+    if updated.rows_affected() != 1 {
+        return Err(AppError::new(
+            ErrorCode::StorageUnavailable,
+            "匿名单文件预留已失效，请重试",
+        ));
+    }
+    Ok(())
+}
+
+pub async fn finalize_anonymous_single_reservation(
+    state: &AppState,
+    task_id: Uuid,
+    charged: bool,
+) -> Result<(), AppError> {
+    if charged {
+        let mut conn = state.redis.clone();
+        let _: i64 = redis::cmd("DEL")
+            .arg(anonymous_single_reservation_key(task_id))
+            .query_async(&mut conn)
+            .await
+            .map_err(|err| {
+                AppError::new(ErrorCode::Internal, "完成匿名单文件计费失败").with_source(err)
+            })?;
+        return Ok(());
+    }
+    refund_anonymous_single_reservation(state, task_id).await
+}
+
+pub async fn refund_anonymous_single_reservation(
+    state: &AppState,
+    task_id: Uuid,
+) -> Result<(), AppError> {
+    let row: Option<(String, String, NaiveDate, i32)> = sqlx::query_as(
+        r#"
+        SELECT session_id, host(client_ip), quota_date, units
+        FROM anonymous_single_reservations
+        WHERE task_id = $1
+          AND status IN ('pending', 'refund_pending', 'refunded')
+        "#,
+    )
+    .bind(task_id)
+    .fetch_optional(&state.db)
+    .await
+    .map_err(|err| AppError::new(ErrorCode::Internal, "查询匿名单文件预留失败").with_source(err))?;
+    let Some((session_id, ip, date, units)) = row else {
+        return Ok(());
+    };
+    let ip: IpAddr = ip.parse().map_err(|err| {
+        AppError::new(ErrorCode::Internal, "匿名单文件预留 IP 无效").with_source(err)
+    })?;
+    let units = u32::try_from(units).unwrap_or(0);
+    let session_key = anonymous_session_key(&session_id, date);
+    let ip_key = anonymous_ip_key(ip, date);
+    let reservation_key = anonymous_single_reservation_key(task_id);
+    let refund_key = format!("anon_quota_refund:{task_id}");
     let mut conn = state.redis.clone();
     let script = redis::Script::new(
         r#"
         local dec = tonumber(ARGV[1])
+        local ttl = tonumber(ARGV[2])
+        if redis.call('EXISTS', KEYS[4]) == 1 then return 0 end
 
-        local function refund(key)
+        if redis.call('EXISTS', KEYS[3]) == 1 then
-          local current = tonumber(redis.call('GET', key) or '0')
+          local function refund(key)
-          if current <= 0 then return 0 end
+            local current = tonumber(redis.call('GET', key) or '0')
-          return redis.call('DECRBY', key, math.min(current, dec))
+            if current <= 0 then return 0 end
+            return redis.call('DECRBY', key, math.min(current, dec))
+          end
+          refund(KEYS[1])
+          refund(KEYS[2])
+          redis.call('DEL', KEYS[3])
         end
-
+        redis.call('SET', KEYS[4], '1', 'EX', ttl)
-        refund(KEYS[1])
-        refund(KEYS[2])
         return 1
         "#,
     );
-
     let _: i64 = script
         .key(session_key)
         .key(ip_key)
+        .key(reservation_key)
+        .key(refund_key)
         .arg(units as i64)
+        .arg(48 * 60 * 60)
         .invoke_async(&mut conn)
         .await
-        .map_err(|err| AppError::new(ErrorCode::Internal, "退还匿名配额失败").with_source(err))?;
+        .map_err(|err| {
+            AppError::new(ErrorCode::Internal, "退还匿名单文件配额失败").with_source(err)
+        })?;
+    sqlx::query(
+        r#"
+        UPDATE anonymous_single_reservations
+        SET status = 'refunded', settled_at = NOW(), updated_at = NOW()
+        WHERE task_id = $1 AND status IN ('pending', 'refund_pending', 'refunded')
+        "#,
+    )
+    .bind(task_id)
+    .execute(&state.db)
+    .await
+    .map_err(|err| AppError::new(ErrorCode::Internal, "记录匿名单文件退款失败").with_source(err))?;
     Ok(())
 }
 
+pub async fn settle_stale_anonymous_single_reservations(
+    state: &AppState,
+    limit: i64,
+) -> Result<usize, AppError> {
+    let task_ids: Vec<Uuid> = sqlx::query_scalar(
+        r#"
+        SELECT task_id
+        FROM anonymous_single_reservations
+        WHERE status = 'refund_pending'
+           OR (status = 'pending' AND refund_after <= NOW())
+        ORDER BY refund_after ASC
+        LIMIT $1
+        "#,
+    )
+    .bind(limit)
+    .fetch_all(&state.db)
+    .await
+    .map_err(|err| {
+        AppError::new(ErrorCode::Internal, "查询待补偿匿名单文件预留失败").with_source(err)
+    })?;
+    let mut settled = 0;
+    for task_id in task_ids {
+        match refund_anonymous_single_reservation(state, task_id).await {
+            Ok(()) => settled += 1,
+            Err(err) => {
+                tracing::warn!(task_id = %task_id, error = %err, "anonymous single reservation refund deferred")
+            }
+        }
+    }
+    Ok(settled)
+}
+
 pub async fn refund_anonymous_reservation_once(
     state: &AppState,
     task_id: Uuid,
@@ -541,6 +743,10 @@ fn anonymous_session_key(session_id: &str, date: NaiveDate) -> String {
     format!("anon_quota:{session_id}:{}", date.format("%Y-%m-%d"))
 }
 
+fn anonymous_single_reservation_key(task_id: Uuid) -> String {
+    format!("anon_quota_reservation:{task_id}")
+}
+
 pub(crate) fn anonymous_ip_scope(ip: IpAddr) -> String {
     match ip {
         IpAddr::V4(ip) => ip.to_string(),
@@ -980,4 +1186,230 @@ mod tests {
                 .expect("delete quota settlement Redis keys");
         }
     }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+    #[ignore = "requires isolated IMAGEFORGE_TEST_DATABASE_URL and IMAGEFORGE_TEST_REDIS_URL"]
+    async fn anonymous_single_reservations_charge_actual_work_and_refund_original_date() {
+        let database_url = std::env::var("IMAGEFORGE_TEST_DATABASE_URL")
+            .expect("IMAGEFORGE_TEST_DATABASE_URL must be set");
+        assert!(
+            database_url.to_ascii_lowercase().contains("test"),
+            "refusing to run destructive integration test outside a test database"
+        );
+        let redis_url = std::env::var("IMAGEFORGE_TEST_REDIS_URL")
+            .expect("IMAGEFORGE_TEST_REDIS_URL must be set");
+        let pool = PgPoolOptions::new()
+            .max_connections(16)
+            .connect(&database_url)
+            .await
+            .expect("connect anonymous single test database");
+        sqlx::migrate!().run(&pool).await.expect("run migrations");
+        let state = build_test_state(pool.clone(), database_url, redis_url).await;
+        let marker = Uuid::new_v4().simple().to_string();
+        let current_date = utc8_date();
+        let previous_date = current_date.pred_opt().expect("previous quota date");
+        let mut cleanup = Vec::new();
+
+        async fn mark_and_finalize(
+            state: &AppState,
+            task_id: Uuid,
+            charged: bool,
+        ) -> Result<(), AppError> {
+            let mut tx = state.db.begin().await.map_err(|err| {
+                AppError::new(ErrorCode::Internal, "begin anonymous single test").with_source(err)
+            })?;
+            mark_anonymous_single_result(&mut tx, task_id, charged).await?;
+            tx.commit().await.map_err(|err| {
+                AppError::new(ErrorCode::Internal, "commit anonymous single test").with_source(err)
+            })?;
+            finalize_anonymous_single_reservation(state, task_id, charged).await
+        }
+
+        let passthrough_task = Uuid::new_v4();
+        let passthrough_session = format!("single-passthrough-{marker}");
+        let passthrough_ip: IpAddr = "198.51.100.31".parse().expect("parse passthrough IP");
+        reserve_anonymous_single_unit_for_date(
+            &state,
+            passthrough_task,
+            &passthrough_session,
+            passthrough_ip,
+            current_date,
+        )
+        .await
+        .expect("reserve passthrough unit");
+        let passthrough_charged = output_consumes_unit(Some(100), true, false, false, 100, 50);
+        assert!(!passthrough_charged);
+        mark_and_finalize(&state, passthrough_task, passthrough_charged)
+            .await
+            .expect("refund passthrough unit");
+        assert_eq!(
+            anonymous_quota_counts(&state, &passthrough_session, passthrough_ip, current_date)
+                .await,
+            (0, 0)
+        );
+        cleanup.push((
+            passthrough_task,
+            passthrough_session,
+            passthrough_ip,
+            current_date,
+        ));
+
+        let unchanged_task = Uuid::new_v4();
+        let unchanged_session = format!("single-unchanged-{marker}");
+        let unchanged_ip: IpAddr = "198.51.100.32".parse().expect("parse unchanged IP");
+        reserve_anonymous_single_unit_for_date(
+            &state,
+            unchanged_task,
+            &unchanged_session,
+            unchanged_ip,
+            current_date,
+        )
+        .await
+        .expect("reserve unchanged-output unit");
+        let unchanged_charged = output_consumes_unit(None, true, false, false, 100, 100);
+        assert!(!unchanged_charged);
+        mark_and_finalize(&state, unchanged_task, unchanged_charged)
+            .await
+            .expect("refund unchanged-output unit");
+        assert_eq!(
+            anonymous_quota_counts(&state, &unchanged_session, unchanged_ip, current_date).await,
+            (0, 0)
+        );
+        cleanup.push((
+            unchanged_task,
+            unchanged_session,
+            unchanged_ip,
+            current_date,
+        ));
+
+        let compressed_task = Uuid::new_v4();
+        let compressed_session = format!("single-compressed-{marker}");
+        let compressed_ip: IpAddr = "198.51.100.33".parse().expect("parse compressed IP");
+        reserve_anonymous_single_unit_for_date(
+            &state,
+            compressed_task,
+            &compressed_session,
+            compressed_ip,
+            current_date,
+        )
+        .await
+        .expect("reserve compressed unit");
+        let compressed_charged = output_consumes_unit(None, true, false, false, 100, 50);
+        assert!(compressed_charged);
+        mark_and_finalize(&state, compressed_task, compressed_charged)
+            .await
+            .expect("finalize compressed unit");
+        assert_eq!(
+            anonymous_quota_counts(&state, &compressed_session, compressed_ip, current_date).await,
+            (1, 1)
+        );
+        let charged_status: String = sqlx::query_scalar(
+            "SELECT status FROM anonymous_single_reservations WHERE task_id = $1",
+        )
+        .bind(compressed_task)
+        .fetch_one(&pool)
+        .await
+        .expect("query charged reservation");
+        assert_eq!(charged_status, "charged");
+        cleanup.push((
+            compressed_task,
+            compressed_session,
+            compressed_ip,
+            current_date,
+        ));
+
+        let cross_day_task = Uuid::new_v4();
+        let cross_day_session = format!("single-cross-day-{marker}");
+        let cross_day_ip: IpAddr = "198.51.100.34".parse().expect("parse cross-day IP");
+        reserve_anonymous_units(&state, &cross_day_session, cross_day_ip, 2)
+            .await
+            .expect("seed current-day quota");
+        reserve_anonymous_single_unit_for_date(
+            &state,
+            cross_day_task,
+            &cross_day_session,
+            cross_day_ip,
+            previous_date,
+        )
+        .await
+        .expect("reserve previous-day unit");
+        refund_anonymous_single_reservation(&state, cross_day_task)
+            .await
+            .expect("refund previous-day failure");
+        assert_eq!(
+            anonymous_quota_counts(&state, &cross_day_session, cross_day_ip, previous_date).await,
+            (0, 0)
+        );
+        assert_eq!(
+            anonymous_quota_counts(&state, &cross_day_session, cross_day_ip, current_date).await,
+            (2, 2),
+            "cross-day refund changed the current quota bucket"
+        );
+        cleanup.push((
+            cross_day_task,
+            cross_day_session.clone(),
+            cross_day_ip,
+            previous_date,
+        ));
+
+        let interrupted_task = Uuid::new_v4();
+        let interrupted_session = format!("single-interrupted-{marker}");
+        let interrupted_ip: IpAddr = "198.51.100.35".parse().expect("parse interrupted IP");
+        reserve_anonymous_single_unit_for_date(
+            &state,
+            interrupted_task,
+            &interrupted_session,
+            interrupted_ip,
+            current_date,
+        )
+        .await
+        .expect("reserve interrupted unit");
+        sqlx::query(
+            "UPDATE anonymous_single_reservations SET refund_after = NOW() - INTERVAL '1 second' WHERE task_id = $1",
+        )
+        .bind(interrupted_task)
+        .execute(&pool)
+        .await
+        .expect("expire interrupted reservation");
+        assert_eq!(
+            settle_stale_anonymous_single_reservations(&state, 10)
+                .await
+                .expect("settle interrupted reservation"),
+            1
+        );
+        assert_eq!(
+            anonymous_quota_counts(&state, &interrupted_session, interrupted_ip, current_date)
+                .await,
+            (0, 0)
+        );
+        cleanup.push((
+            interrupted_task,
+            interrupted_session,
+            interrupted_ip,
+            current_date,
+        ));
+
+        let mut redis = state.redis.clone();
+        for (task_id, session_id, ip, date) in cleanup {
+            sqlx::query("DELETE FROM anonymous_single_reservations WHERE task_id = $1")
+                .bind(task_id)
+                .execute(&pool)
+                .await
+                .expect("delete anonymous single reservation");
+            let _: i64 = redis::cmd("DEL")
+                .arg(anonymous_session_key(&session_id, date))
+                .arg(anonymous_ip_key(ip, date))
+                .arg(anonymous_single_reservation_key(task_id))
+                .arg(format!("anon_quota_refund:{task_id}"))
+                .query_async(&mut redis)
+                .await
+                .expect("delete anonymous single Redis keys");
+        }
+        let _: i64 = redis::cmd("DEL")
+            .arg(anonymous_session_key(&cross_day_session, current_date))
+            .arg(anonymous_ip_key(cross_day_ip, current_date))
+            .query_async(&mut redis)
+            .await
+            .expect("delete cross-day current Redis keys");
+    }
 }

src/worker/mod.rs

@@ -1715,6 +1715,7 @@ async fn charge_one_unit(
 }
 
 async fn maintenance(state: &AppState) -> Result<(), AppError> {
+    settle_stale_anonymous_single_reservations(state).await?;
     settle_finished_anonymous_reservations(state).await?;
     cleanup_expired_tasks(state).await?;
     cleanup_stale_zip_temp(state).await?;
@@ -1722,6 +1723,19 @@ async fn maintenance(state: &AppState) -> Result<(), AppError> {
     Ok(())
 }
 
+async fn settle_stale_anonymous_single_reservations(state: &AppState) -> Result<(), AppError> {
+    for _ in 0..MAX_MAINTENANCE_BATCHES {
+        let settled =
+            quota::settle_stale_anonymous_single_reservations(state, MAINTENANCE_BATCH_SIZE)
+                .await?;
+        if settled < MAINTENANCE_BATCH_SIZE as usize {
+            break;
+        }
+        tokio::task::yield_now().await;
+    }
+    Ok(())
+}
+
 async fn settle_finished_anonymous_reservations(state: &AppState) -> Result<(), AppError> {
     for _ in 0..MAX_MAINTENANCE_BATCHES {
         let task_ids: Vec<Uuid> = sqlx::query_scalar(
@@ -1816,6 +1830,16 @@ async fn cleanup_expired_records(state: &AppState) -> Result<(), AppError> {
     .execute(&state.db)
     .await;
 
+    let _ = sqlx::query(
+        r#"
+        DELETE FROM anonymous_single_reservations
+        WHERE status IN ('charged', 'refunded')
+          AND settled_at < NOW() - INTERVAL '7 days'
+        "#,
+    )
+    .execute(&state.db)
+    .await;
+
     let _ =
         sqlx::query("DELETE FROM webhook_events WHERE received_at < NOW() - INTERVAL '90 days'")
             .execute(&state.db)