fix: harden provider polling recovery

src/aiTaskWorker.js

@@ -5,6 +5,7 @@ const { EventEmitter } = require("node:events");
 const { pool } = require("./db");
 const { refundTaskBillingOnFailure } = require("./billing");
 const { putObject, isOssConfigured } = require("./ossClient");
+const { withProviderPollSlot } = require("./providerPollLimiter");
 
 const taskEvents = new EventEmitter();
 taskEvents.setMaxListeners(200);
@@ -18,10 +19,12 @@ const TASK_EVENT_ORIGIN = `${process.pid}-${crypto.randomUUID()}`;
 const POLLER_OWNER_ID = `${process.pid}-${crypto.randomUUID()}`;
 const POLLER_OWNER_STALE_MS = Number(process.env.TASK_POLLER_OWNER_STALE_MS || 20_000);
 const POLLER_RECOVERY_INTERVAL_MS = Number(process.env.TASK_POLLER_RECOVERY_INTERVAL_MS || 30_000);
+const PROVIDER_POLL_REQUEST_TIMEOUT_MS = Number(process.env.TASK_PROVIDER_POLL_REQUEST_TIMEOUT_MS || 25_000);
 let taskEventListenerClient = null;
 let taskEventListenerStarting = null;
 let pollerStoreReady = null;
 let pollerRecoveryTimer = null;
+let staleTaskCleanupStartupTimer = null;
 
 function normalizeTaskProgress(value) {
   const numeric = Number(value);
@@ -152,6 +155,14 @@ async function clearPollerState(taskDbId) {
   await pool.query("DELETE FROM generation_task_pollers WHERE task_id = $1", [taskDbId]);
 }
 
+async function orphanOwnedPollerState() {
+  await ensureTaskPollerStore();
+  await pool.query(
+    "UPDATE generation_task_pollers SET owner_id = NULL, owner_heartbeat_at = NULL, updated_at = NOW() WHERE owner_id = $1",
+    [POLLER_OWNER_ID],
+  );
+}
+
 async function getPersistedLeaseToken(taskDbId) {
   await ensureTaskPollerStore();
   const { rows } = await pool.query(
@@ -280,6 +291,12 @@ async function updateTaskInDb(taskId, updates) {
     });
   }
 
+  if (nextUpdates.status === "completed") {
+    await markTaskBillingAccepted(taskId).catch((err) => {
+      console.error(`[aiTaskWorker] billing accept error for task ${taskId}:`, err.message);
+    });
+  }
+
   if (nextUpdates.status === "failed") {
     await refundTaskBillingOnFailure(taskId).catch((err) => {
       console.error(`[aiTaskWorker] refund error for task ${taskId}:`, err.message);
@@ -287,6 +304,13 @@ async function updateTaskInDb(taskId, updates) {
   }
 }
 
+async function markTaskBillingAccepted(taskId) {
+  await pool.query(
+    "UPDATE credit_ledger SET status = 'charged', updated_at = NOW() WHERE task_id = $1 AND status = 'reserved'",
+    [taskId],
+  );
+}
+
 function persistTaskResultUrlToOssInBackground(task) {
   if (!task?.id || !task?.result_url) return;
 
@@ -641,9 +665,22 @@ function extractErrorMessage(json, fallback) {
 }
 
 async function fetchJson(url, headers) {
-  const res = await fetch(url, { method: "GET", headers });
-  if (!res.ok) return { ok: false, json: null };
-  return { ok: true, json: await res.json() };
+  const controller = new AbortController();
+  const timeoutMs = Number.isFinite(PROVIDER_POLL_REQUEST_TIMEOUT_MS) && PROVIDER_POLL_REQUEST_TIMEOUT_MS > 0
+    ? PROVIDER_POLL_REQUEST_TIMEOUT_MS
+    : 25_000;
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+  timer.unref?.();
+
+  try {
+    const res = await fetch(url, { method: "GET", headers, signal: controller.signal });
+    if (!res.ok) return { ok: false, json: null };
+    return { ok: true, json: await res.json() };
+  } catch (err) {
+    return { ok: false, json: null, error: err };
+  } finally {
+    clearTimeout(timer);
+  }
 }
 
 async function pollGrsaiImage(_taskId, providerTaskId, apiKey, baseUrl, resultEndpoint) {
@@ -813,26 +850,31 @@ function startPolling(taskDbId, { providerTaskId, apiKey, type, providerConfig,
   }
 
   let attempts = 0;
+  let polling = false;
+  let skippedPolls = 0;
   const maxPollAttempts = getMaxPollAttempts(type, providerConfig);
   const interval = setInterval(async () => {
-    attempts++;
-    if (attempts > maxPollAttempts) {
-      clearInterval(interval);
-      activePollers.delete(taskDbId);
-      if (leaseToken && keyManager) await keyManager.releaseKey(leaseToken).catch(() => {});
-      if (typeof onTaskFailed === "function") {
-        const handled = await onTaskFailed("Task timed out").catch((fallbackErr) => {
-          console.error(`[aiTaskWorker] fallback error for task ${taskDbId}:`, fallbackErr.message);
-          return false;
-        });
-        if (handled) return;
-      }
-      await updateTaskInDb(taskDbId, { status: "failed", error: "Task timed out" });
-      await clearPollerState(taskDbId).catch(() => {});
-      return;
-    }
+    if (polling) return;
+    polling = true;
 
     try {
+      if (attempts >= maxPollAttempts) {
+        clearInterval(interval);
+        activePollers.delete(taskDbId);
+        if (leaseToken && keyManager) await keyManager.releaseKey(leaseToken).catch(() => {});
+        if (typeof onTaskFailed === "function") {
+          await clearPollerState(taskDbId).catch(() => {});
+          const handled = await onTaskFailed("Task timed out").catch((fallbackErr) => {
+            console.error(`[aiTaskWorker] fallback error for task ${taskDbId}:`, fallbackErr.message);
+            return false;
+          });
+          if (handled) return;
+        }
+        await updateTaskInDb(taskDbId, { status: "failed", error: "Task timed out" });
+        await clearPollerState(taskDbId).catch(() => {});
+        return;
+      }
+
       // Check if task was cancelled by user
       const { rows: [taskRow] } = await pool.query("SELECT status FROM generation_tasks WHERE id = $1", [taskDbId]);
       if (!taskRow || taskRow.status === "cancelled") {
@@ -844,15 +886,29 @@ function startPolling(taskDbId, { providerTaskId, apiKey, type, providerConfig,
       }
       await refreshPollerHeartbeat(taskDbId).catch(() => {});
 
-      let result;
-      if (type === "image") {
-        if (providerConfig.transport === "dashscope-image") {
-          result = await pollDashscopeImage(taskDbId, providerTaskId, apiKey);
-        } else {
-          result = await pollGrsaiImage(taskDbId, providerTaskId, apiKey, providerConfig.baseUrl, providerConfig.resultEndpoint || "/result");
+      const pollOutcome = await withProviderPollSlot(taskDbId, async () => {
+        attempts++;
+        if (type === "image") {
+          if (providerConfig.transport === "dashscope-image") {
+            return pollDashscopeImage(taskDbId, providerTaskId, apiKey);
+          }
+          return pollGrsaiImage(taskDbId, providerTaskId, apiKey, providerConfig.baseUrl, providerConfig.resultEndpoint || "/result");
         }
-      } else {
-        result = await pollVideoTask(taskDbId, providerTaskId, apiKey, providerConfig);
+        return pollVideoTask(taskDbId, providerTaskId, apiKey, providerConfig);
+      });
+
+      if (!pollOutcome.acquired) {
+        skippedPolls++;
+        if (skippedPolls % 20 === 0) {
+          console.info(`[aiTaskWorker] task ${taskDbId} waiting for provider poll slot (skipped=${skippedPolls})`);
+        }
+        return;
+      }
+
+      skippedPolls = 0;
+      const result = pollOutcome.value;
+      if (!result) {
+        return;
       }
 
       if (result.status === "completed" || result.status === "failed") {
@@ -860,6 +916,7 @@ function startPolling(taskDbId, { providerTaskId, apiKey, type, providerConfig,
         activePollers.delete(taskDbId);
         if (leaseToken && keyManager) await keyManager.releaseKey(leaseToken).catch(() => {});
         if (result.status === "failed" && typeof onTaskFailed === "function") {
+          await clearPollerState(taskDbId).catch(() => {});
           const handled = await onTaskFailed(result.error || "Task failed").catch((fallbackErr) => {
             console.error(`[aiTaskWorker] fallback error for task ${taskDbId}:`, fallbackErr.message);
             return false;
@@ -874,6 +931,8 @@ function startPolling(taskDbId, { providerTaskId, apiKey, type, providerConfig,
       }
     } catch (err) {
       console.error(`[aiTaskWorker] poll error for task ${taskDbId}:`, err.message);
+    } finally {
+      polling = false;
     }
   }, POLL_INTERVAL_MS);
 
@@ -921,7 +980,7 @@ async function recoverRunnablePollers() {
   const staleInterval = `${Math.max(5, Math.ceil(POLLER_OWNER_STALE_MS / 1000))} seconds`;
   const { rows } = await pool.query(
     `
-    SELECT p.task_id
+    SELECT p.task_id, p.updated_at
     FROM generation_task_pollers p
     JOIN generation_tasks t ON t.id = p.task_id
     WHERE t.status IN ('pending', 'running')
@@ -944,6 +1003,7 @@ async function recoverRunnablePollers() {
     const apiKey = await getLeaseKey(poller.lease_token);
     if (apiKey == null) {
       console.warn(`[aiTaskWorker] cannot recover task ${taskId}: active lease not found`);
+      await releaseUnrecoverableTask(taskId, "任务执行状态已失效，已自动释放");
       continue;
     }
 
@@ -955,11 +1015,51 @@ async function recoverRunnablePollers() {
       providerConfig: parseProviderConfig(poller.provider_config_json),
       leaseToken: poller.lease_token,
       keyManager: require("./keyManager"),
+      onTaskFailed: async (failureMessage) => {
+        await updateTaskInDb(taskId, { status: "failed", error: failureMessage || "Task failed" });
+        return true;
+      },
       skipPersist: true,
     });
   }
 }
 
+async function releaseUnrecoverableTask(taskId, message) {
+  const { rows } = await pool.query(
+    `
+    UPDATE generation_tasks t
+    SET status = 'failed', error = $2, completed_at = NOW(), updated_at = NOW()
+    FROM generation_task_pollers p
+    WHERE t.id = $1
+      AND p.task_id = t.id
+      AND p.owner_id = $3
+      AND t.status IN ('pending', 'running')
+    RETURNING t.*
+  `,
+    [taskId, message, POLLER_OWNER_ID],
+  );
+
+  const task = rows[0];
+  if (!task) return false;
+
+  const leaseToken = await getPersistedLeaseToken(taskId).catch(() => null);
+  await clearPollerState(taskId).catch(() => {});
+  if (leaseToken) {
+    await require("./keyManager").releaseKey(leaseToken).catch((err) => {
+      console.error(`[aiTaskWorker] failed to release lease for unrecoverable task ${taskId}:`, err.message);
+    });
+  }
+  await publishTaskEvent(formatTaskEvent(task));
+  await createTaskLifecycleNotification(task).catch((err) => {
+    console.error(`[aiTaskWorker] notification error for unrecoverable task ${taskId}:`, err.message);
+  });
+  await refundTaskBillingOnFailure(taskId).catch((err) => {
+    console.error(`[aiTaskWorker] refund error for unrecoverable task ${taskId}:`, err.message);
+  });
+  console.warn(`[aiTaskWorker] released unrecoverable task ${taskId}: ${message}`);
+  return true;
+}
+
 // --- Periodic stale task cleanup ---
 // Runs every 5 minutes, marks tasks stuck in 'pending'/'running' for too long as 'failed'.
 // This catches cases where the worker crashed, the provider API never responded,
@@ -971,26 +1071,32 @@ async function runStaleTaskCleanup() {
   try {
     const { rows } = await pool.query(
       `UPDATE generation_tasks
-       SET status = 'failed', error = '任务超时自动释放', updated_at = NOW()
+       SET status = 'failed', error = '任务超时自动释放', completed_at = NOW(), updated_at = NOW()
        WHERE status IN ('pending', 'running')
          AND GREATEST(updated_at, COALESCE(last_poll_at, created_at)) < NOW() - INTERVAL '10 minutes'
-       RETURNING id`,
+       RETURNING *`,
     );
     for (const row of rows) {
-      await publishTaskEvent({
-        taskId: row.id,
-        status: "failed",
-        progress: null,
-        resultUrl: null,
-        error: "任务超时自动释放",
-      });
       // Also stop any active poller for this task
       const poller = activePollers.get(row.id);
       if (poller) {
         clearInterval(poller.interval);
         activePollers.delete(row.id);
       }
+      const leaseToken = poller?.leaseToken || await getPersistedLeaseToken(row.id).catch(() => null);
       await clearPollerState(row.id).catch(() => {});
+      if (leaseToken) {
+        await require("./keyManager").releaseKey(leaseToken).catch((err) => {
+          console.error(`[aiTaskWorker] failed to release lease for stale task ${row.id}:`, err.message);
+        });
+      }
+      await publishTaskEvent(formatTaskEvent(row));
+      await createTaskLifecycleNotification(row).catch((err) => {
+        console.error(`[aiTaskWorker] notification error for stale task ${row.id}:`, err.message);
+      });
+      await refundTaskBillingOnFailure(row.id).catch((err) => {
+        console.error(`[aiTaskWorker] refund error for stale task ${row.id}:`, err.message);
+      });
     }
     if (rows.length > 0) {
       console.log(`[aiTaskWorker] Cleaned up ${rows.length} stale task(s)`);
@@ -1064,10 +1170,14 @@ function startStaleTaskCleanup() {
   if (staleTaskCleanupTimer) return;
   staleTaskCleanupTimer = setInterval(runStaleTaskCleanup, STALE_TASK_CLEANUP_INTERVAL_MS);
   // Run once shortly after startup
-  setTimeout(runStaleTaskCleanup, 10_000);
+  staleTaskCleanupStartupTimer = setTimeout(runStaleTaskCleanup, 10_000);
 }
 
 function stopStaleTaskCleanup() {
+  if (staleTaskCleanupStartupTimer) {
+    clearTimeout(staleTaskCleanupStartupTimer);
+    staleTaskCleanupStartupTimer = null;
+  }
   if (staleTaskCleanupTimer) {
     clearInterval(staleTaskCleanupTimer);
     staleTaskCleanupTimer = null;
@@ -1093,9 +1203,20 @@ function stopPollerRecovery() {
   }
 }
 
+async function stopAllPollers() {
+  for (const [taskId, poller] of activePollers.entries()) {
+    clearInterval(poller.interval);
+    activePollers.delete(taskId);
+  }
+  await orphanOwnedPollerState().catch((err) => {
+    console.error("[aiTaskWorker] failed to orphan owned poller state:", err.message);
+  });
+}
+
 module.exports = {
   startPolling,
   stopPolling,
+  stopAllPollers,
   cancelTaskRuntimeState,
   updateTaskInDb,
   getActiveCount,

src/index.js

@@ -3,8 +3,17 @@ const express = require('express')
 const rateLimit = require('express-rate-limit')
 const cors = require('cors')
 const helmet = require('helmet')
-const { startSettlementWorker } = require('./settlementWorker')
-const { startProviderHealthMonitor } = require('./providerHealthMonitor')
+const { startSettlementWorker, stopSettlementWorker } = require('./settlementWorker')
+const { startProviderHealthMonitor, stopProviderHealthMonitor } = require('./providerHealthMonitor')
+const {
+  startStaleTaskCleanup,
+  startTaskEventListener,
+  startPollerRecovery,
+  stopStaleTaskCleanup,
+  stopTaskEventListener,
+  stopPollerRecovery,
+  stopAllPollers,
+} = require('./aiTaskWorker')
 const { ensureDatabase } = require('./dbSetup')
 const { assertRuntimeSecurityConfig } = require('./securityConfig')
 const { loadPriceCache } = require('./pricing')
@@ -17,6 +26,7 @@ const PORT = Number(process.env.PORT) || 3600
 const HOST = process.env.HOST || '0.0.0.0'
 const IS_PRODUCTION = process.env.NODE_ENV === 'production'
 let server = null
+let staleLeaseCleanupTimer = null
 
 // CORS: in production, require explicit allowlist; in dev, allow all with credentials
 function buildCorsOptions() {
@@ -133,18 +143,18 @@ async function main() {
 
   // Periodic stale lease cleanup (every 5 min)
   const { cleanStaleLeases } = require('./keyManager')
-  setInterval(() => {
+  staleLeaseCleanupTimer = setInterval(() => {
     cleanStaleLeases().then((cleaned) => {
       if (cleaned > 0) console.log(`[cleanup] Released ${cleaned} stale lease(s)`)
     }).catch((err) => {
       console.error('[cleanup] error:', err)
     })
   }, 5 * 60 * 1000)
+  if (staleLeaseCleanupTimer.unref) staleLeaseCleanupTimer.unref()
 
   startSettlementWorker()
   startProviderHealthMonitor()
 
-  const { startStaleTaskCleanup, startTaskEventListener, startPollerRecovery } = require('./aiTaskWorker')
   await startTaskEventListener()
   startPollerRecovery()
   startStaleTaskCleanup()
@@ -175,32 +185,47 @@ process.on('uncaughtException', (err) => {
 // ── Graceful shutdown ───────────────────────────────────────────────────
 let shuttingDown = false
 
-function gracefulShutdown(signal) {
+async function shutdownRuntimeState() {
+  if (staleLeaseCleanupTimer) {
+    clearInterval(staleLeaseCleanupTimer)
+    staleLeaseCleanupTimer = null
+  }
+  stopSettlementWorker()
+  stopProviderHealthMonitor()
+  stopPollerRecovery()
+  stopStaleTaskCleanup()
+  await Promise.allSettled([stopTaskEventListener(), stopAllPollers()])
+}
+
+function closeServer() {
+  if (!server || !server.listening) return Promise.resolve()
+  return new Promise((resolve) => {
+    server.close(() => {
+      console.log('[shutdown] Server closed, cleaning up...')
+      resolve()
+    })
+  })
+}
+
+async function gracefulShutdown(signal) {
   if (shuttingDown) return
   shuttingDown = true
   console.log('[shutdown] Received ' + signal + ', draining connections...')
 
-  if (server && server.listening) {
-    server.close(() => {
-      console.log('[shutdown] Server closed, cleaning up...')
-      const { stopProviderHealthMonitor } = require('./providerHealthMonitor')
-      stopProviderHealthMonitor()
-      const { stopTaskEventListener, stopPollerRecovery } = require('./aiTaskWorker')
-      stopPollerRecovery()
-      void stopTaskEventListener()
-      const { pool } = require('./db')
-      pool.end().then(() => {
-        console.log('[shutdown] Database pool closed')
-        process.exit(0)
-      }).catch(() => process.exit(0))
-    })
+  setTimeout(() => {
+    console.error('[shutdown] Forced exit after timeout')
+    process.exit(1)
+  }, 15000).unref()
 
-    // Force exit after timeout
-    setTimeout(() => {
-      console.error('[shutdown] Forced exit after timeout')
-      process.exit(1)
-    }, 15000).unref()
-  } else {
+  try {
+    await shutdownRuntimeState()
+    await closeServer()
+    const { pool } = require('./db')
+    await pool.end()
+    console.log('[shutdown] Database pool closed')
+    process.exit(0)
+  } catch (err) {
+    console.error('[shutdown] error:', err)
     process.exit(0)
   }
 }

src/keyManager.js

@@ -284,7 +284,7 @@ async function releaseLeaseInternal(leaseToken, user, options = {}) {
     const { rows } = await client.query(
       `
       WITH candidate AS (
-        SELECT l.id, l.key_id, k.provider
+        SELECT l.id, l.key_id, l.user_id, l.enterprise_id, k.provider
         FROM key_leases l
         JOIN api_keys k ON k.id = l.key_id
         WHERE l.lease_token = $1 AND l.released_at IS NULL
@@ -297,7 +297,7 @@ async function releaseLeaseInternal(leaseToken, user, options = {}) {
         WHERE id = (SELECT id FROM candidate)
         RETURNING id, key_id
       )
-      SELECT r.id, r.key_id, c.provider
+      SELECT r.id, r.key_id, c.user_id AS lease_user_id, c.enterprise_id AS lease_enterprise_id, c.provider
       FROM released r
       JOIN candidate c ON c.key_id = r.key_id
     `,
@@ -339,7 +339,13 @@ async function releaseLeaseInternal(leaseToken, user, options = {}) {
       INSERT INTO usage_logs (user_id, enterprise_id, provider, key_id, action)
       VALUES ($1, $2, (SELECT provider FROM api_keys WHERE id = $3), $4, $5)
     `,
-      [userId, enterpriseId, lease.key_id, lease.key_id, "release"],
+      [
+        userId || lease.lease_user_id,
+        enterpriseId || lease.lease_enterprise_id,
+        lease.key_id,
+        lease.key_id,
+        "release",
+      ],
     );
 
     return {

src/providerPollLimiter.js

@@ -0,0 +1,120 @@
+"use strict";
+
+const crypto = require("node:crypto");
+const { pool } = require("./db");
+
+const DEFAULT_MAX_CONCURRENCY = 8;
+const DEFAULT_SLOT_TTL_MS = 30_000;
+const POLL_SCOPE = "generation-provider-poll:global";
+const OWNER_ID = `${process.pid}-${crypto.randomUUID()}`;
+
+let storeReady = null;
+
+function normalizePositiveInteger(value, fallback) {
+  const numeric = Number(value);
+  if (!Number.isFinite(numeric) || numeric <= 0) return fallback;
+  return Math.max(1, Math.trunc(numeric));
+}
+
+function getMaxConcurrency() {
+  return normalizePositiveInteger(process.env.TASK_PROVIDER_POLL_MAX_CONCURRENCY, DEFAULT_MAX_CONCURRENCY);
+}
+
+function getSlotTtlInterval() {
+  const ttlMs = normalizePositiveInteger(process.env.TASK_PROVIDER_POLL_SLOT_TTL_MS, DEFAULT_SLOT_TTL_MS);
+  return `${Math.max(1, Math.ceil(ttlMs / 1000))} seconds`;
+}
+
+async function ensureProviderPollLimiterStore() {
+  if (storeReady) return storeReady;
+  storeReady = pool.query(`
+    CREATE TABLE IF NOT EXISTS generation_provider_poll_slots (
+      scope TEXT NOT NULL,
+      slot_no INTEGER NOT NULL,
+      owner_id TEXT NOT NULL,
+      task_id INTEGER,
+      expires_at TIMESTAMPTZ NOT NULL,
+      acquired_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+      updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+      PRIMARY KEY (scope, slot_no)
+    );
+    CREATE INDEX IF NOT EXISTS idx_generation_provider_poll_slots_expires
+      ON generation_provider_poll_slots(expires_at);
+  `).catch((err) => {
+    storeReady = null;
+    throw err;
+  });
+  return storeReady;
+}
+
+async function acquireProviderPollSlot(taskId, options = {}) {
+  await ensureProviderPollLimiterStore();
+
+  const scope = options.scope || POLL_SCOPE;
+  const maxConcurrency = normalizePositiveInteger(options.maxConcurrency, getMaxConcurrency());
+  const ttlInterval = options.ttlInterval || getSlotTtlInterval();
+  const { rows } = await pool.query(
+    `
+    WITH candidate AS (
+      SELECT s.slot_no
+      FROM generate_series(1, $2::integer) AS s(slot_no)
+      LEFT JOIN generation_provider_poll_slots l
+        ON l.scope = $1 AND l.slot_no = s.slot_no
+      WHERE l.scope IS NULL OR l.expires_at < NOW()
+      ORDER BY s.slot_no ASC
+      LIMIT 1
+    ),
+    claimed AS (
+      INSERT INTO generation_provider_poll_slots (
+        scope, slot_no, owner_id, task_id, expires_at, acquired_at, updated_at
+      )
+      SELECT $1, slot_no, $3, $4, NOW() + ($5::text)::interval, NOW(), NOW()
+      FROM candidate
+      ON CONFLICT (scope, slot_no) DO UPDATE SET
+        owner_id = EXCLUDED.owner_id,
+        task_id = EXCLUDED.task_id,
+        expires_at = EXCLUDED.expires_at,
+        acquired_at = NOW(),
+        updated_at = NOW()
+      WHERE generation_provider_poll_slots.expires_at < NOW()
+      RETURNING scope, slot_no
+    )
+    SELECT scope, slot_no FROM claimed
+  `,
+    [scope, maxConcurrency, OWNER_ID, taskId || null, ttlInterval],
+  );
+
+  const slot = rows[0];
+  return slot ? { scope: slot.scope, slotNo: slot.slot_no, ownerId: OWNER_ID } : null;
+}
+
+async function releaseProviderPollSlot(slot) {
+  if (!slot?.scope || !slot?.slotNo) return;
+  await ensureProviderPollLimiterStore();
+  await pool.query(
+    "DELETE FROM generation_provider_poll_slots WHERE scope = $1 AND slot_no = $2 AND owner_id = $3",
+    [slot.scope, slot.slotNo, slot.ownerId || OWNER_ID],
+  );
+}
+
+async function withProviderPollSlot(taskId, fn, options = {}) {
+  const slot = await acquireProviderPollSlot(taskId, options);
+  if (!slot) return { acquired: false, value: undefined };
+
+  try {
+    return { acquired: true, value: await fn() };
+  } finally {
+    await releaseProviderPollSlot(slot).catch((err) => {
+      console.error(`[providerPollLimiter] failed to release poll slot ${slot.scope}:${slot.slotNo}:`, err.message);
+    });
+  }
+}
+
+module.exports = {
+  acquireProviderPollSlot,
+  ensureProviderPollLimiterStore,
+  getMaxConcurrency,
+  normalizePositiveInteger,
+  releaseProviderPollSlot,
+  withProviderPollSlot,
+};

src/routes/ai.js

@@ -1072,6 +1072,16 @@ function registerAiRoutes(router) {
           error.costCents = billingResult.costCents;
           throw error;
         }
+        if (billingResult.costCents > 0) {
+          await client.query(
+            "UPDATE generation_tasks SET cost_cents = $1, billing_target = $2, billing_refunded = 0, updated_at = NOW() WHERE id = $3",
+            [
+              billingResult.costCents,
+              billingResult.deductionType === "enterprise_image_flat" ? "enterprise_image" : "user",
+              nextTaskRow.id,
+            ],
+          );
+        }
         return { taskRow: nextTaskRow, imageBilling: billingResult };
       });
       const preauth = { authorized: true, estimatedCostCents: 0, billingMode: imageBilling.deductionType };
@@ -1086,9 +1096,11 @@ function registerAiRoutes(router) {
         },
         providerDebug: buildImageProviderDebug(model),
       });
-      submitImageWithProviderFallback(taskRow.id, providerCandidates, req.user, preauth, params).catch((err) => {
+      submitImageWithProviderFallback(taskRow.id, providerCandidates, req.user, preauth, params).catch(async (err) => {
         console.error("[ai/image] submit error:", err.message);
-        updateTaskInDb(taskRow.id, { status: "failed", error: err.message });
+        await updateTaskInDb(taskRow.id, { status: "failed", error: err.message }).catch((updateErr) => {
+          console.error(`[ai/image] failed to persist task ${taskRow.id} failure:`, updateErr.message);
+        });
       });
     } catch (err) {
       console.error("[ai/image] error:", err.message);
@@ -1200,6 +1212,10 @@ function registerAiRoutes(router) {
             ...enterpriseBilling,
             taskId: nextTaskRow.id,
           });
+          await client.query(
+            "UPDATE generation_tasks SET cost_cents = $1, billing_target = 'enterprise_video', billing_refunded = 0, updated_at = NOW() WHERE id = $2",
+            [nextBilling.amountCents, nextTaskRow.id],
+          );
           return { taskRow: nextTaskRow, reservedBilling: nextBilling, regularBilling: null };
         }
         // Regular user: deduct from personal balance
@@ -1222,6 +1238,10 @@ function registerAiRoutes(router) {
           "INSERT INTO transactions (user_id, type, amount_cents, balance_after_cents, description) VALUES ($1, 'deduct', $2, $3, $4)",
           [req.user.id, -costCents, deducted.balance_cents, `视频生成扣费 ${credits} 积分`],
         );
+        await client.query(
+          "UPDATE generation_tasks SET cost_cents = $1, billing_target = 'user', billing_refunded = 0, updated_at = NOW() WHERE id = $2",
+          [costCents, nextTaskRow.id],
+        );
         return { taskRow: nextTaskRow, reservedBilling: null, regularBilling: { costCents, balanceAfterCents: deducted.balance_cents, credits } };
       });