diff --git a/backend/server.js b/backend/server.js
index 0405c0f..a1d8deb 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -125,7 +125,8 @@ function sendOk(res, meta) {
 }
 
 function sendError(res, status, message, code, details) {
-  return res.status(status).json({ message, code, details });
+  const requestId = res.req?.id;
+  return res.status(status).json({ code, message, details, requestId });
 }
 
 // Map UI resource -> S3 key (for history endpoints)
@@ -460,7 +461,7 @@ app.post('/api/domains', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -516,7 +517,7 @@ app.get('/api/asns', async (req, res) => {
             res.json([]);
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -607,7 +608,7 @@ app.get('/api/domains-new', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -698,7 +699,7 @@ app.get('/api/ip-ranges', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -779,7 +780,7 @@ app.get('/api/communities', async (req, res) => {
             return res.json([]);
         }
         console.error('Error reading communities from S3:', error);
-        res.status(500).send('Error reading communities from S3');
+        return sendError(res, 500, 'Error reading communities from S3', 'E_S3');
     }
 });
 
@@ -788,7 +789,7 @@ app.post('/api/communities', async (req, res) => {
     const { communities } = req.body;
 
     if (!Array.isArray(communities)) {
-        return res.status(400).send('communities must be an array');
+        return sendError(res, 400, 'communities must be an array', 'E_BAD_REQUEST');
     }
 
     // Validate entries and ensure unique values
@@ -798,10 +799,10 @@ app.post('/api/communities', async (req, res) => {
         const entry = communities[i] || {};
         const value = typeof entry.value === 'string' ? entry.value.trim() : '';
         if (!value) {
-            return res.status(400).send(`Community at index ${i} is missing required field: value`);
+            return sendError(res, 400, `Community at index ${i} is missing required field: value`, 'E_SCHEMA');
         }
         if (seen.has(value)) {
-            return res.status(400).send(`Duplicate community value at index ${i}: ${value}`);
+            return sendError(res, 400, `Duplicate community value at index ${i}: ${value}`, 'E_SCHEMA');
         }
         seen.add(value);
         normalized.push({
@@ -826,7 +827,7 @@ app.post('/api/communities', async (req, res) => {
         res.send('Communities updated successfully');
     } catch (error) {
         console.error('Error writing communities to S3:', error);
-        res.status(500).send('Error writing communities to S3');
+        return sendError(res, 500, 'Error writing communities to S3', 'E_S3');
     }
 });
 
@@ -861,7 +862,7 @@ app.get('/api/servers', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -872,14 +873,14 @@ app.post('/api/servers', async (req, res) => {
     
     // Validate servers structure
     if (!Array.isArray(servers)) {
-        return res.status(400).send('Servers must be an array');
+        return sendError(res, 400, 'Servers must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each server has required fields
     for (let i = 0; i < servers.length; i++) {
         const server = servers[i];
         if (!server.ip || !server.dns || !server.country || !server.provider || !server.tunnel) {
-            return res.status(400).send(`Server at index ${i} is missing required fields`);
+            return sendError(res, 400, `Server at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -895,7 +896,7 @@ app.post('/api/servers', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -930,7 +931,7 @@ app.get('/api/billing', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -941,14 +942,14 @@ app.post('/api/billing', async (req, res) => {
     
     // Validate billing data structure
     if (!Array.isArray(billingData)) {
-        return res.status(400).send('Billing data must be an array');
+        return sendError(res, 400, 'Billing data must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each billing item has required fields
     for (let i = 0; i < billingData.length; i++) {
         const item = billingData[i];
         if (!item.hostName || !item.country || !item.provider) {
-            return res.status(400).send(`Billing item at index ${i} is missing required fields: hostName, country, provider`);
+            return sendError(res, 400, `Billing item at index ${i} is missing required fields: hostName, country, provider`, 'E_SCHEMA');
         }
     }
 
@@ -964,7 +965,7 @@ app.post('/api/billing', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -999,7 +1000,7 @@ app.get('/api/filters', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -1010,14 +1011,14 @@ app.post('/api/filters', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1033,7 +1034,7 @@ app.post('/api/filters', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -1066,7 +1067,7 @@ app.get('/api/s3/last-modified', async (req, res) => {
         res.json(out);
     } catch (error) {
         console.error('Error fetching last modified dates from S3:', error);
-        res.status(500).send('Error fetching last modified dates from S3');
+        return sendError(res, 500, 'Error fetching last modified dates from S3', 'E_S3');
     }
 });
 
@@ -1190,7 +1191,7 @@ app.get('/api/filters/generate-config', async (req, res) => {
             res.json({ config: '// filters.json file not found' });
         } else {
             console.error(error);
-            res.status(500).send('Error generating configuration');
+            return sendError(res, 500, 'Error generating configuration', 'E_S3');
         }
     }
 });
@@ -1252,7 +1253,7 @@ app.post('/api/filters/export-config', async (req, res) => {
         res.json({ success: true, message: 'Конфигурация экспортирована в S3' });
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error exporting configuration');
+        return sendError(res, 500, 'Error exporting configuration', 'E_S3');
     }
 });
 
@@ -1286,7 +1287,7 @@ app.get('/api/server-configs', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading server configs from S3');
+            return sendError(res, 500, 'Error reading server configs from S3', 'E_S3');
         }
     }
 });
@@ -1297,14 +1298,14 @@ app.post('/api/server-configs', async (req, res) => {
     
     // Validate servers structure
     if (!Array.isArray(servers)) {
-        return res.status(400).send('Servers must be an array');
+        return sendError(res, 400, 'Servers must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each server has required fields
     for (let i = 0; i < servers.length; i++) {
         const server = servers[i];
         if (!server.id || !server.name) {
-            return res.status(400).send(`Server at index ${i} is missing required fields`);
+            return sendError(res, 400, `Server at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1320,7 +1321,7 @@ app.post('/api/server-configs', async (req, res) => {
         res.send('Server configs updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server configs to S3');
+        return sendError(res, 500, 'Error writing server configs to S3', 'E_S3');
     }
 });
 
@@ -1341,7 +1342,7 @@ app.get('/api/server-configs/:serverId', async (req, res) => {
             res.json({ config: '// Конфигурация не найдена' });
         } else {
             console.error(error);
-            res.status(500).send('Error reading server config from S3');
+            return sendError(res, 500, 'Error reading server config from S3', 'E_S3');
         }
     }
 });
@@ -1352,7 +1353,7 @@ app.post('/api/server-configs/:serverId', async (req, res) => {
     const { config } = req.body;
     
     if (!config) {
-        return res.status(400).send('Config is required');
+        return sendError(res, 400, 'Config is required', 'E_BAD_REQUEST');
     }
 
     const params = {
@@ -1367,7 +1368,7 @@ app.post('/api/server-configs/:serverId', async (req, res) => {
         res.send('Server config saved successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server config to S3');
+        return sendError(res, 500, 'Error writing server config to S3', 'E_S3');
     }
 });
 
@@ -1384,7 +1385,7 @@ app.delete('/api/server-configs/:serverId', async (req, res) => {
         res.send('Server config deleted successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error deleting server config from S3');
+        return sendError(res, 500, 'Error deleting server config from S3', 'E_S3');
     }
 });
 
@@ -1414,7 +1415,7 @@ app.delete('/api/server-configs/:serverId/complete', async (req, res) => {
         res.send('Server and all associated files deleted successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error deleting server files from S3');
+        return sendError(res, 500, 'Error deleting server files from S3', 'E_S3');
     }
 });
 
@@ -1449,7 +1450,7 @@ app.get('/api/server-filters/:serverId', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading server filters from S3');
+            return sendError(res, 500, 'Error reading server filters from S3', 'E_S3');
         }
     }
 });
@@ -1497,14 +1498,14 @@ app.post('/api/server-filters/:serverId', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1520,7 +1521,7 @@ app.post('/api/server-filters/:serverId', async (req, res) => {
         res.send('Server filters updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server filters to S3');
+        return sendError(res, 500, 'Error writing server filters to S3', 'E_S3');
     }
 });
 
@@ -1554,7 +1555,7 @@ app.get('/api/simple-filters', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading simple filters from S3');
+            return sendError(res, 500, 'Error reading simple filters from S3', 'E_S3');
         }
     }
 });
@@ -1565,14 +1566,14 @@ app.post('/api/simple-filters', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1588,7 +1589,7 @@ app.post('/api/simple-filters', async (req, res) => {
         res.send('Simple filters updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing simple filters to S3');
+        return sendError(res, 500, 'Error writing simple filters to S3', 'E_S3');
     }
 });
 
@@ -1616,7 +1617,7 @@ app.get('/api/auto-urls', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading auto URLs from S3');
+            return sendError(res, 500, 'Error reading auto URLs from S3', 'E_S3');
         }
     }
 });
@@ -1714,7 +1715,7 @@ app.post('/api/auto-urls', async (req, res) => {
         res.send('Auto URLs updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing auto URLs to S3');
+        return sendError(res, 500, 'Error writing auto URLs to S3', 'E_S3');
     }
 });
 
@@ -1745,7 +1746,7 @@ app.post('/api/auto-urls/process', async (req, res) => {
         }
         
         if (urls.length === 0) {
-            return res.status(400).send('No URLs to process');
+            return sendError(res, 400, 'No URLs to process', 'E_BAD_REQUEST');
         }
         
         // Get current IPs
@@ -1830,7 +1831,7 @@ app.post('/api/auto-urls/process', async (req, res) => {
         
     } catch (error) {
         console.error('Error processing auto URLs:', error);
-        res.status(500).send('Error processing auto URLs');
+        return sendError(res, 500, 'Error processing auto URLs', 'E_S3');
     }
 });
 
@@ -1846,8 +1847,10 @@ app.use((err, req, res, next) => {
   const status = typeof err?.status === 'number' ? err.status : 500;
   const code = err?.code || 'E_INTERNAL';
   const message = status === 500 && process.env.NODE_ENV === 'production' ? 'Internal Server Error' : (err?.message || 'Error');
-  try { console.error('error:', err); } catch {}
-  res.status(status).json({ message, code });
+  const details = err?.details;
+  const requestId = req?.id;
+  try { req.log?.error({ err, code, requestId }, 'request error'); } catch {}
+  res.status(status).json({ code, message, details, requestId });
 });
 
 app.listen(port, () => {
diff --git a/frontend/src/components/ConfirmDialog.jsx b/frontend/src/components/ConfirmDialog.jsx
index e4ad993..01ac662 100644
--- a/frontend/src/components/ConfirmDialog.jsx
+++ b/frontend/src/components/ConfirmDialog.jsx
@@ -9,9 +9,18 @@ export default function ConfirmDialog({ open, title, message, confirmText = 'П
   }, [open])
   if (!open) return null
   return (
-    <div className="modal show d-block" role="dialog" aria-modal="true" aria-labelledby="confirm-title" aria-describedby="confirm-message" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }}>
+    <div className="modal show d-block" role="dialog" aria-modal="true" aria-labelledby="confirm-title" aria-describedby="confirm-message" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }} onKeyDown={(e) => { if (e.key === 'Escape') onCancel?.() }}>
       <div className="modal-dialog" role="document">
-        <div className="modal-content" ref={ref}>
+        <div className="modal-content" ref={ref} tabIndex={-1} onKeyDown={(e) => {
+          if (e.key === 'Tab') {
+            const focusable = ref.current?.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])')
+            if (!focusable || focusable.length === 0) return
+            const first = focusable[0]
+            const last = focusable[focusable.length - 1]
+            if (e.shiftKey && document.activeElement === first) { e.preventDefault(); last.focus(); }
+            else if (!e.shiftKey && document.activeElement === last) { e.preventDefault(); first.focus(); }
+          }
+        }}>
           <div className="modal-header">
             <h5 id="confirm-title" className="modal-title">{title || 'Подтверждение'}</h5>
             <button type="button" className="btn-close" aria-label="Close" onClick={onCancel}></button>
diff --git a/frontend/src/components/ConfirmDiffModal.jsx b/frontend/src/components/ConfirmDiffModal.jsx
index 15ea0b0..020a82c 100644
--- a/frontend/src/components/ConfirmDiffModal.jsx
+++ b/frontend/src/components/ConfirmDiffModal.jsx
@@ -4,11 +4,21 @@ function ConfirmDiffModal({ show, diff, onConfirm, onClose }) {
   const removed = diff?.removed?.length || 0;
   const changed = diff?.changed?.length || 0;
   return (
-    <div className="modal show d-block" tabIndex="-1" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }}>
+    <div className="modal show d-block" role="dialog" aria-modal="true" aria-labelledby="confirm-diff-title" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }} onKeyDown={(e) => { if (e.key === 'Escape') onClose?.() }}>
       <div className="modal-dialog modal-sm modal-dialog-centered" role="document">
-        <div className="modal-content">
+        <div className="modal-content" tabIndex={-1} onKeyDown={(e) => {
+          if (e.key === 'Tab') {
+            const c = e.currentTarget
+            const focusable = c.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])')
+            if (!focusable || focusable.length === 0) return
+            const first = focusable[0]
+            const last = focusable[focusable.length - 1]
+            if (e.shiftKey && document.activeElement === first) { e.preventDefault(); last.focus(); }
+            else if (!e.shiftKey && document.activeElement === last) { e.preventDefault(); first.focus(); }
+          }
+        }}>
           <div className="modal-header">
-            <h5 className="modal-title">Подтвердить сохранение</h5>
+            <h5 id="confirm-diff-title" className="modal-title">Подтвердить сохранение</h5>
             <button type="button" className="btn-close" onClick={onClose}></button>
           </div>
           <div className="modal-body">
diff --git a/frontend/src/components/HistoryModal.jsx b/frontend/src/components/HistoryModal.jsx
index 861cf13..1a14ea6 100644
--- a/frontend/src/components/HistoryModal.jsx
+++ b/frontend/src/components/HistoryModal.jsx
@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import api from '../lib/api.js';
 import { useQuery } from '@tanstack/react-query';
+import ConfirmDialog from './ConfirmDialog.jsx';
 import { useNotify } from './NotifyProvider.jsx';
 import { IconHistory, IconRefresh, IconDeviceFloppy } from '@tabler/icons-react';
 
@@ -22,30 +23,49 @@ export default function HistoryModal({ resource, show, onClose, onRolledBack })
 
   useEffect(() => { if (show) refetch().catch(() => notify.error('Не удалось загрузить историю версий')); }, [show, resource]);
 
+  const [confirmState, setConfirmState] = useState({ open: false, onConfirm: null });
   const rollback = async (versionId) => {
     if (!versionId) return;
-    if (!confirm('Откатить к выбранной версии? Текущее содержимое будет перезаписано.')) return;
-    setLoading(true);
-    try {
-      const res = await api.post(`/history/${resource}/rollback`, { versionId });
-      notify.success('Откат выполнен');
-      onRolledBack && onRolledBack(res.data || {});
-      onClose && onClose();
-    } catch (e) {
-      notify.error('Не удалось выполнить откат');
-    } finally {
-      setLoading(false);
-    }
+    await new Promise((resolve) => {
+      setConfirmState({
+        open: true,
+        onConfirm: async () => {
+          setConfirmState({ open: false, onConfirm: null });
+          setLoading(true);
+          try {
+            const res = await api.post(`/history/${resource}/rollback`, { versionId });
+            notify.success('Откат выполнен');
+            onRolledBack && onRolledBack(res.data || {});
+            onClose && onClose();
+          } catch (e) {
+            notify.error('Не удалось выполнить откат');
+          } finally {
+            setLoading(false);
+          }
+          resolve();
+        }
+      });
+    });
   };
 
   if (!show) return null;
 
   return (
-    <div className="modal show d-block" tabIndex="-1" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }}>
+    <div className="modal show d-block" role="dialog" aria-modal="true" aria-labelledby="history-title" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }} onKeyDown={(e) => { if (e.key === 'Escape') onClose?.() }}>
       <div className="modal-dialog modal-lg modal-dialog-centered" role="document">
-        <div className="modal-content">
+        <div className="modal-content" tabIndex={-1} onKeyDown={(e) => {
+          if (e.key === 'Tab') {
+            const c = e.currentTarget
+            const focusable = c.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])')
+            if (!focusable || focusable.length === 0) return
+            const first = focusable[0]
+            const last = focusable[focusable.length - 1]
+            if (e.shiftKey && document.activeElement === first) { e.preventDefault(); last.focus(); }
+            else if (!e.shiftKey && document.activeElement === last) { e.preventDefault(); first.focus(); }
+          }
+        }}>
           <div className="modal-header">
-            <h5 className="modal-title d-flex align-items-center">
+            <h5 id="history-title" className="modal-title d-flex align-items-center">
               <IconHistory className="me-2" /> История версий
             </h5>
             <button type="button" className="btn-close" onClick={onClose}></button>
@@ -96,6 +116,14 @@ export default function HistoryModal({ resource, show, onClose, onRolledBack })
           </div>
         </div>
       </div>
+      <ConfirmDialog
+        open={confirmState.open}
+        title="Подтверждение"
+        message="Откатить к выбранной версии? Текущее содержимое будет перезаписано."
+        confirmText="Откатить"
+        onCancel={() => setConfirmState({ open: false, onConfirm: null })}
+        onConfirm={confirmState.onConfirm}
+      />
     </div>
   );
 }
diff --git a/frontend/src/components/NotifyProvider.jsx b/frontend/src/components/NotifyProvider.jsx
index 7ab34ce..108e564 100644
--- a/frontend/src/components/NotifyProvider.jsx
+++ b/frontend/src/components/NotifyProvider.jsx
@@ -37,18 +37,18 @@ export function NotifyProvider({ children }) {
     timeouts.current.set(id, t);
   }, [remove]);
 
-  const add = useCallback((type, message) => {
+  const add = useCallback((type, message, details) => {
     const text = String(message || '').trim();
     if (!text) return;
     setItems((prev) => {
       const dup = prev.find((n) => n.type === type && n.message === text);
       if (dup) {
-        const updated = prev.map((n) => n.id === dup.id ? { ...n, count: (n.count || 1) + 1, createdAt: Date.now() } : n);
+        const updated = prev.map((n) => n.id === dup.id ? { ...n, count: (n.count || 1) + 1, createdAt: Date.now(), details: details ?? n.details } : n);
         schedule(dup.id, type);
         return updated;
       }
       const id = idSeq.current++;
-      const next = [...prev, { id, type, message: text, count: 1, createdAt: Date.now() }];
+      const next = [...prev, { id, type, message: text, details, count: 1, createdAt: Date.now() }];
       schedule(id, type);
       return next;
     });
@@ -62,10 +62,10 @@ export function NotifyProvider({ children }) {
 
   const api = useMemo(() => ({
     add,
-    success: (m) => add('success', m),
-    error: (m) => add('error', m),
-    info: (m) => add('info', m),
-    warning: (m) => add('warning', m),
+    success: (m, d) => add('success', m, d),
+    error: (m, d) => add('error', m, d),
+    info: (m, d) => add('info', m, d),
+    warning: (m, d) => add('warning', m, d),
     remove,
     clear,
   }), [add, remove, clear]);
@@ -116,6 +116,12 @@ function NotifyViewport({ items, onClose }) {
               <div className="me-1 mt-1">{iconByType(n.type)}</div>
               <div className="flex-grow-1">
                 {n.message}
+                {n.details && (
+                  <details className="small mt-1">
+                    <summary>Подробнее</summary>
+                    <pre className="mb-0 mt-1" style={{ whiteSpace: 'pre-wrap' }}>{typeof n.details === 'string' ? n.details : JSON.stringify(n.details, null, 2)}</pre>
+                  </details>
+                )}
                 {n.count > 1 && (
                   <span className="badge bg-white text-body border ms-2">×{n.count}</span>
                 )}
diff --git a/frontend/src/lib/api.js b/frontend/src/lib/api.js
index 541c7da..51e2fc1 100644
--- a/frontend/src/lib/api.js
+++ b/frontend/src/lib/api.js
@@ -34,9 +34,13 @@ api.interceptors.response.use(
   (err) => {
     try {
       const status = err?.response?.status;
-      const message = err?.response?.data?.message || err?.message || 'Ошибка запроса';
+      const data = err?.response?.data || {};
+      const message = data?.message || err?.message || 'Ошибка запроса';
+      const code = data?.code;
+      const details = data?.details;
+      const requestId = data?.requestId || err?.response?.headers?.['x-request-id'] || err?.config?.headers?.['X-Request-Id'];
       if (status >= 400 && typeof window !== 'undefined' && window.notify?.error) {
-        window.notify.error(`${message} (${status ?? '—'})`);
+        window.notify.add('error', `${message}${status ? ` (${status})` : ''}${requestId ? ` • reqId=${requestId}` : ''}`, details ? { code, requestId, details } : undefined);
       }
     } catch {}
     return Promise.reject(err);