feat(doctor): add system diagnostics feature

locales/de.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "Systemdiagnose",
+        "title": "Doktor",
+        "buttonTitle": "Diagnose und häufige Fehlerbehebungen ausführen",
+        "loading": "Umgebung wird geprüft...",
+        "footer": "Exportiere ein Diagnosepaket, falls das Problem nach der Reparatur weiterhin besteht.",
+        "summary": {
+            "idle": "Führe eine Überprüfung von Einstellungen, Cache-Integrität und UI-Konsistenz durch.",
+            "ok": "Keine aktiven Probleme wurden in der aktuellen Umgebung gefunden.",
+            "warning": "{count} Problem(e) wurden gefunden. Die meisten lassen sich direkt über dieses Panel beheben.",
+            "error": "Bevor die App vollständig fehlerfrei ist, müssen {count} Problem(e) behoben werden."
+        },
+        "status": {
+            "ok": "Gesund",
+            "warning": "Handlungsbedarf",
+            "error": "Aktion erforderlich"
+        },
+        "actions": {
+            "runAgain": "Erneut ausführen",
+            "exportBundle": "Paket exportieren"
+        },
+        "toast": {
+            "loadFailed": "Diagnose konnte nicht geladen werden: {message}",
+            "repairSuccess": "Cache-Neuaufbau abgeschlossen.",
+            "repairFailed": "Cache-Neuaufbau fehlgeschlagen: {message}",
+            "exportSuccess": "Diagnosepaket exportiert.",
+            "exportFailed": "Export des Diagnosepakets fehlgeschlagen: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "Anwendungs-Update erkannt",

locales/en.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "System diagnostics",
+        "title": "Doctor",
+        "buttonTitle": "Run diagnostics and common fixes",
+        "loading": "Checking environment...",
+        "footer": "Export a diagnostics bundle if the issue still persists after repair.",
+        "summary": {
+            "idle": "Run a health check for settings, cache integrity, and UI consistency.",
+            "ok": "No active issues were found in the current environment.",
+            "warning": "{count} issue(s) were found. Most can be fixed directly from this panel.",
+            "error": "{count} issue(s) need attention before the app is fully healthy."
+        },
+        "status": {
+            "ok": "Healthy",
+            "warning": "Needs Attention",
+            "error": "Action Required"
+        },
+        "actions": {
+            "runAgain": "Run Again",
+            "exportBundle": "Export Bundle"
+        },
+        "toast": {
+            "loadFailed": "Failed to load diagnostics: {message}",
+            "repairSuccess": "Cache rebuild completed.",
+            "repairFailed": "Cache rebuild failed: {message}",
+            "exportSuccess": "Diagnostics bundle exported.",
+            "exportFailed": "Failed to export diagnostics bundle: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "Application Update Detected",

locales/es.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "Diagnósticos del sistema",
+        "title": "Doctor",
+        "buttonTitle": "Ejecutar diagnósticos y correcciones comunes",
+        "loading": "Comprobando el entorno...",
+        "footer": "Exporta un paquete de diagnóstico si el problema persiste después de la reparación.",
+        "summary": {
+            "idle": "Ejecuta una comprobación del estado de la configuración, la integridad de la caché y la coherencia de la interfaz.",
+            "ok": "No se encontraron problemas activos en el entorno actual.",
+            "warning": "Se encontraron {count} problema(s). La mayoría se puede solucionar directamente desde este panel.",
+            "error": "Se encontraron {count} problema(s). Deben atenderse antes de que la aplicación esté completamente saludable."
+        },
+        "status": {
+            "ok": "Saludable",
+            "warning": "Requiere atención",
+            "error": "Se requiere acción"
+        },
+        "actions": {
+            "runAgain": "Ejecutar de nuevo",
+            "exportBundle": "Exportar paquete"
+        },
+        "toast": {
+            "loadFailed": "Error al cargar los diagnósticos: {message}",
+            "repairSuccess": "Reconstrucción de caché completada.",
+            "repairFailed": "Error al reconstruir la caché: {message}",
+            "exportSuccess": "Paquete de diagnósticos exportado.",
+            "exportFailed": "Error al exportar el paquete de diagnósticos: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "Actualización de la aplicación detectada",

locales/fr.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "Diagnostics système",
+        "title": "Docteur",
+        "buttonTitle": "Lancer les diagnostics et les corrections courantes",
+        "loading": "Vérification de l'environnement...",
+        "footer": "Exportez un lot de diagnostic si le problème persiste après la réparation.",
+        "summary": {
+            "idle": "Lancez une vérification de l'état des paramètres, de l'intégrité du cache et de la cohérence de l'interface.",
+            "ok": "Aucun problème actif n'a été trouvé dans l'environnement actuel.",
+            "warning": "{count} problème(s) ont été trouvés. La plupart peuvent être corrigés directement depuis ce panneau.",
+            "error": "{count} problème(s) nécessitent une attention avant que l'application soit entièrement saine."
+        },
+        "status": {
+            "ok": "Sain",
+            "warning": "Nécessite une attention",
+            "error": "Action requise"
+        },
+        "actions": {
+            "runAgain": "Relancer",
+            "exportBundle": "Exporter le lot"
+        },
+        "toast": {
+            "loadFailed": "Échec du chargement des diagnostics : {message}",
+            "repairSuccess": "Reconstruction du cache terminée.",
+            "repairFailed": "Échec de la reconstruction du cache : {message}",
+            "exportSuccess": "Lot de diagnostics exporté.",
+            "exportFailed": "Échec de l'export du lot de diagnostics : {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "Mise à jour de l'application détectée",

locales/he.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "אבחון מערכת",
+        "title": "דוקטור",
+        "buttonTitle": "הפעלת אבחון ותיקונים נפוצים",
+        "loading": "בודק את הסביבה...",
+        "footer": "ייצא חבילת אבחון אם הבעיה עדיין נמשכת לאחר התיקון.",
+        "summary": {
+            "idle": "הרץ בדיקת תקינות עבור הגדרות, שלמות המטמון ועקביות הממשק.",
+            "ok": "לא נמצאו בעיות פעילות בסביבה הנוכחית.",
+            "warning": "נמצאה/נמצאו {count} בעיה/בעיות. את רובן אפשר לתקן ישירות מלוח זה.",
+            "error": "יש לטפל ב-{count} בעיה/בעיות לפני שהאפליקציה תהיה תקינה לחלוטין."
+        },
+        "status": {
+            "ok": "תקין",
+            "warning": "דורש תשומת לב",
+            "error": "נדרשת פעולה"
+        },
+        "actions": {
+            "runAgain": "הפעל שוב",
+            "exportBundle": "ייצוא חבילה"
+        },
+        "toast": {
+            "loadFailed": "טעינת האבחון נכשלה: {message}",
+            "repairSuccess": "בניית המטמון מחדש הושלמה.",
+            "repairFailed": "בניית המטמון מחדש נכשלה: {message}",
+            "exportSuccess": "חבילת האבחון יוצאה.",
+            "exportFailed": "ייצוא חבילת האבחון נכשל: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "זוהה עדכון יישום",

locales/ja.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "システム診断",
+        "title": "ドクター",
+        "buttonTitle": "診断と一般的な修復を実行",
+        "loading": "環境を確認中...",
+        "footer": "修復後も問題が続く場合は、診断パッケージをエクスポートしてください。",
+        "summary": {
+            "idle": "設定、キャッシュ整合性、UI の一貫性をヘルスチェックします。",
+            "ok": "現在の環境でアクティブな問題は見つかりませんでした。",
+            "warning": "{count} 件の問題が見つかりました。ほとんどはこのパネルから直接修復できます。",
+            "error": "アプリが完全に正常になる前に、{count} 件の問題に対処する必要があります。"
+        },
+        "status": {
+            "ok": "正常",
+            "warning": "要注意",
+            "error": "対応が必要"
+        },
+        "actions": {
+            "runAgain": "再実行",
+            "exportBundle": "パッケージをエクスポート"
+        },
+        "toast": {
+            "loadFailed": "診断の読み込みに失敗しました: {message}",
+            "repairSuccess": "キャッシュの再構築が完了しました。",
+            "repairFailed": "キャッシュの再構築に失敗しました: {message}",
+            "exportSuccess": "診断パッケージをエクスポートしました。",
+            "exportFailed": "診断パッケージのエクスポートに失敗しました: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "アプリケーション更新が検出されました",

locales/ko.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "시스템 진단",
+        "title": "닥터",
+        "buttonTitle": "진단 및 일반적인 수정 실행",
+        "loading": "환경을 확인하는 중...",
+        "footer": "수리 후에도 문제가 계속되면 진단 번들을 내보내세요.",
+        "summary": {
+            "idle": "설정, 캐시 무결성, UI 일관성에 대한 상태 검사를 실행합니다.",
+            "ok": "현재 환경에서 활성 문제를 찾지 못했습니다.",
+            "warning": "{count}개의 문제가 발견되었습니다. 대부분은 이 패널에서 바로 해결할 수 있습니다.",
+            "error": "앱이 완전히 정상 상태가 되기 전에 {count}개의 문제를 처리해야 합니다."
+        },
+        "status": {
+            "ok": "정상",
+            "warning": "주의 필요",
+            "error": "조치 필요"
+        },
+        "actions": {
+            "runAgain": "다시 실행",
+            "exportBundle": "번들 내보내기"
+        },
+        "toast": {
+            "loadFailed": "진단 로드 실패: {message}",
+            "repairSuccess": "캐시 재구성이 완료되었습니다.",
+            "repairFailed": "캐시 재구성 실패: {message}",
+            "exportSuccess": "진단 번들이 내보내졌습니다.",
+            "exportFailed": "진단 번들 내보내기 실패: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "애플리케이션 업데이트 감지",

locales/ru.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "Системная диагностика",
+        "title": "Доктор",
+        "buttonTitle": "Запустить диагностику и обычные исправления",
+        "loading": "Проверка окружения...",
+        "footer": "Экспортируйте диагностический пакет, если проблема сохраняется после исправления.",
+        "summary": {
+            "idle": "Выполнить проверку настроек, целостности кэша и согласованности интерфейса.",
+            "ok": "В текущем окружении активных проблем не обнаружено.",
+            "warning": "Обнаружено {count} проблем(ы). Большинство можно исправить прямо из этой панели.",
+            "error": "Перед тем как приложение станет полностью исправным, нужно устранить {count} проблем(ы)."
+        },
+        "status": {
+            "ok": "Исправно",
+            "warning": "Требует внимания",
+            "error": "Требуется действие"
+        },
+        "actions": {
+            "runAgain": "Запустить снова",
+            "exportBundle": "Экспортировать пакет"
+        },
+        "toast": {
+            "loadFailed": "Не удалось загрузить диагностику: {message}",
+            "repairSuccess": "Перестройка кэша завершена.",
+            "repairFailed": "Не удалось перестроить кэш: {message}",
+            "exportSuccess": "Диагностический пакет экспортирован.",
+            "exportFailed": "Не удалось экспортировать диагностический пакет: {message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "Обнаружено обновление приложения",

locales/zh-CN.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "系统诊断",
+        "title": "医生",
+        "buttonTitle": "运行诊断并尝试修复常见问题",
+        "loading": "正在检查当前环境...",
+        "footer": "如果修复后问题仍然存在，可以导出诊断包进一步排查。",
+        "summary": {
+            "idle": "检查设置、缓存健康状况和前后端 UI 版本是否一致。",
+            "ok": "当前环境未发现活动问题。",
+            "warning": "发现 {count} 个问题，大多数可以直接在这里处理。",
+            "error": "发现 {count} 个需要尽快处理的问题。"
+        },
+        "status": {
+            "ok": "健康",
+            "warning": "需要关注",
+            "error": "需要处理"
+        },
+        "actions": {
+            "runAgain": "重新检查",
+            "exportBundle": "导出诊断包"
+        },
+        "toast": {
+            "loadFailed": "加载诊断结果失败：{message}",
+            "repairSuccess": "缓存重建完成。",
+            "repairFailed": "缓存重建失败：{message}",
+            "exportSuccess": "诊断包已导出。",
+            "exportFailed": "导出诊断包失败：{message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "检测到应用更新",

locales/zh-TW.json

@@ -1806,6 +1806,35 @@
             "moveFailed": "Failed to move item: {message}"
         }
     },
+    "doctor": {
+        "kicker": "系統診斷",
+        "title": "醫生",
+        "buttonTitle": "執行診斷與常見修復",
+        "loading": "正在檢查環境...",
+        "footer": "如果修復後問題仍然存在，請匯出診斷套件。",
+        "summary": {
+            "idle": "針對設定、快取完整性與 UI 一致性執行健康檢查。",
+            "ok": "目前環境中未發現任何活動中的問題。",
+            "warning": "找到 {count} 個問題。大多可以直接在此面板修復。",
+            "error": "應先處理 {count} 個問題，應用程式才能完全正常。"
+        },
+        "status": {
+            "ok": "健康",
+            "warning": "需要注意",
+            "error": "需要處理"
+        },
+        "actions": {
+            "runAgain": "重新執行",
+            "exportBundle": "匯出套件"
+        },
+        "toast": {
+            "loadFailed": "載入診斷失敗：{message}",
+            "repairSuccess": "快取重建完成。",
+            "repairFailed": "快取重建失敗：{message}",
+            "exportSuccess": "診斷套件已匯出。",
+            "exportFailed": "匯出診斷套件失敗：{message}"
+        }
+    },
     "banners": {
         "versionMismatch": {
             "title": "偵測到應用程式更新",

py/routes/handlers/misc_handlers.py

@@ -10,15 +10,19 @@ from __future__ import annotations
 
 import asyncio
 import contextlib
+import io
 import json
 import logging
 import os
+import platform
+import re
 import subprocess
 import sys
 import tempfile
 import zipfile
 from dataclasses import dataclass
-from typing import Awaitable, Callable, Dict, Mapping, Protocol
+from datetime import datetime, timezone
+from typing import Any, Awaitable, Callable, Dict, Mapping, Protocol, Sequence
 
 from aiohttp import web
 
@@ -32,6 +36,7 @@ from ...services.settings_manager import get_settings_manager
 from ...services.websocket_manager import ws_manager
 from ...services.downloader import get_downloader
 from ...services.errors import ResourceNotFoundError
+from ...services.cache_health_monitor import CacheHealthMonitor, CacheHealthStatus
 from ...utils.constants import (
     CIVITAI_USER_MODEL_TYPES,
     DEFAULT_NODE_COLOR,
@@ -42,12 +47,321 @@ from ...utils.constants import (
 from ...utils.civitai_utils import rewrite_preview_url
 from ...utils.example_images_paths import is_valid_example_images_root
 from ...utils.lora_metadata import extract_trained_words
+from ...utils.session_logging import get_standalone_session_log_snapshot
 from ...utils.usage_stats import UsageStats
 from .base_model_handlers import BaseModelHandlerSet
 
 logger = logging.getLogger(__name__)
 
 
+def _get_project_root() -> str:
+    current_file = os.path.abspath(__file__)
+    return os.path.dirname(
+        os.path.dirname(os.path.dirname(os.path.dirname(current_file)))
+    )
+
+
+def _get_app_version_string() -> str:
+    version = "1.0.0"
+    short_hash = "stable"
+    try:
+        import toml
+
+        root_dir = _get_project_root()
+        pyproject_path = os.path.join(root_dir, "pyproject.toml")
+
+        if os.path.exists(pyproject_path):
+            with open(pyproject_path, "r", encoding="utf-8") as handle:
+                data = toml.load(handle)
+                version = (
+                    data.get("project", {}).get("version", "1.0.0").replace("v", "")
+                )
+
+        git_dir = os.path.join(root_dir, ".git")
+        if os.path.exists(git_dir):
+            try:
+                import git
+
+                repo = git.Repo(root_dir)
+                short_hash = repo.head.commit.hexsha[:7]
+            except Exception:
+                pass
+    except Exception as exc:  # pragma: no cover - defensive logging
+        logger.debug("Failed to resolve app version for doctor diagnostics: %s", exc)
+
+    return f"{version}-{short_hash}"
+
+
+def _sanitize_sensitive_data(payload: Any) -> Any:
+    sensitive_markers = (
+        "api_key",
+        "apikey",
+        "token",
+        "password",
+        "secret",
+        "authorization",
+    )
+
+    if isinstance(payload, dict):
+        sanitized: dict[str, Any] = {}
+        for key, value in payload.items():
+            normalized_key = str(key).lower()
+            if any(marker in normalized_key for marker in sensitive_markers):
+                if isinstance(value, str) and value:
+                    sanitized[key] = f"{value[:4]}***{value[-2:]}" if len(value) > 6 else "***"
+                else:
+                    sanitized[key] = "***"
+            else:
+                sanitized[key] = _sanitize_sensitive_data(value)
+        return sanitized
+
+    if isinstance(payload, list):
+        return [_sanitize_sensitive_data(item) for item in payload]
+
+    if isinstance(payload, str):
+        return _sanitize_sensitive_text(payload)
+
+    return payload
+
+
+def _sanitize_sensitive_text(value: str) -> str:
+    if not value:
+        return value
+
+    redacted = value
+    patterns = (
+        (
+            r'(?i)("authorization"\s*:\s*")Bearer\s+([^"]+)(")',
+            r'\1Bearer ***\3',
+        ),
+        (
+            r'(?i)("x[-_]?api[-_]?key"\s*:\s*")([^"]+)(")',
+            r'\1***\3',
+        ),
+        (
+            r'(?i)("api[_-]?key"\s*:\s*")([^"]+)(")',
+            r'\1***\3',
+        ),
+        (
+            r'(?i)("token"\s*:\s*")([^"]+)(")',
+            r'\1***\3',
+        ),
+        (
+            r'(?i)("password"\s*:\s*")([^"]+)(")',
+            r'\1***\3',
+        ),
+        (
+            r'(?i)("secret"\s*:\s*")([^"]+)(")',
+            r'\1***\3',
+        ),
+        (
+            r"(?i)\b(authorization\s*[:=]\s*bearer\s+)([A-Za-z0-9._\-+/=]+)",
+            r"\1***",
+        ),
+        (
+            r"(?i)\b(x[-_]?api[-_]?key\s*[:=]\s*)([^\s,;]+)",
+            r"\1***",
+        ),
+        (
+            r"(?i)\b(api[_-]?key\s*[:=]\s*)([^\s,;]+)",
+            r"\1***",
+        ),
+        (
+            r"(?i)\b(token\s*[:=]\s*)([^\s,;]+)",
+            r"\1***",
+        ),
+        (
+            r"(?i)\b(password\s*[:=]\s*)([^\s,;]+)",
+            r"\1***",
+        ),
+        (
+            r"(?i)\b(secret\s*[:=]\s*)([^\s,;]+)",
+            r"\1***",
+        ),
+    )
+
+    import re
+
+    for pattern, replacement in patterns:
+        redacted = re.sub(pattern, replacement, redacted)
+
+    return redacted
+
+
+def _read_log_file_tail(path: str, max_bytes: int = 64 * 1024) -> str:
+    if not path or not os.path.isfile(path):
+        return ""
+
+    with open(path, "rb") as handle:
+        handle.seek(0, os.SEEK_END)
+        file_size = handle.tell()
+        handle.seek(max(file_size - max_bytes, 0))
+        payload = handle.read()
+
+    return payload.decode("utf-8", errors="replace")
+
+
+def _read_text_file_head(path: str, max_bytes: int = 8 * 1024) -> str:
+    if not path or not os.path.isfile(path):
+        return ""
+
+    with open(path, "rb") as handle:
+        payload = handle.read(max_bytes)
+
+    return payload.decode("utf-8", errors="replace")
+
+
+def _extract_startup_marker(text: str, label: str) -> str | None:
+    if not text:
+        return None
+
+    pattern = re.compile(rf"{re.escape(label)}\s*:\s*([^\r\n]+)")
+    match = pattern.search(text)
+    if not match:
+        return None
+
+    return match.group(1).strip()
+
+
+def _format_comfyui_log_entries(entries: Sequence[Mapping[str, Any]] | None) -> str:
+    if not entries:
+        return ""
+
+    rendered: list[str] = []
+    for entry in entries:
+        timestamp = str(entry.get("t", "")).strip()
+        message = str(entry.get("m", ""))
+        if not message:
+            continue
+
+        if timestamp:
+            rendered.append(f"{timestamp} - {message}")
+        else:
+            rendered.append(message)
+
+    if not rendered:
+        return ""
+
+    text = "".join(rendered)
+    if text.endswith("\n"):
+        return text
+    return f"{text}\n"
+
+
+def _get_embedded_comfyui_log_path() -> str:
+    return os.path.abspath(
+        os.path.join(_get_project_root(), "..", "..", "user", "comfyui.log")
+    )
+
+
+def _collect_comfyui_session_logs(
+    *,
+    log_entries: Sequence[Mapping[str, Any]] | None = None,
+    log_file_path: str | None = None,
+) -> dict[str, Any]:
+    if log_entries is None:
+        try:
+            import app.logger as comfy_logger
+
+            log_entries = list(comfy_logger.get_logs() or [])
+        except Exception as exc:  # pragma: no cover - environment dependent
+            logger.debug("Failed to read ComfyUI in-memory logs: %s", exc)
+            log_entries = []
+
+    session_log_text = _format_comfyui_log_entries(log_entries)
+    session_started_at = _extract_startup_marker(
+        session_log_text, "** ComfyUI startup time"
+    )
+    if not session_started_at and log_entries:
+        session_started_at = str(log_entries[0].get("t", "")).strip() or None
+
+    resolved_log_path = os.path.abspath(log_file_path or _get_embedded_comfyui_log_path())
+    persisted_log_text = ""
+    notes: list[str] = []
+
+    if os.path.isfile(resolved_log_path):
+        head_text = _read_text_file_head(resolved_log_path)
+        file_started_at = _extract_startup_marker(head_text, "** ComfyUI startup time")
+        if session_started_at and file_started_at and file_started_at == session_started_at:
+            persisted_log_text = _read_log_file_tail(resolved_log_path)
+        elif session_started_at and file_started_at and file_started_at != session_started_at:
+            notes.append(
+                "Persistent ComfyUI log file does not match the current process session."
+            )
+        elif not session_started_at and file_started_at:
+            persisted_log_text = _read_log_file_tail(resolved_log_path)
+            session_started_at = file_started_at
+        else:
+            notes.append(
+                "Persistent ComfyUI log file is missing a startup marker and was not trusted as the current session log."
+            )
+    else:
+        notes.append("Persistent ComfyUI log file was not found.")
+
+    source_method = "comfyui_in_memory"
+    if persisted_log_text:
+        source_method = "comfyui_in_memory+current_log_file"
+    elif not session_log_text:
+        source_method = "unavailable"
+
+    return {
+        "mode": "comfyui",
+        "session_started_at": session_started_at,
+        "session_log_text": session_log_text,
+        "persistent_log_path": resolved_log_path,
+        "persistent_log_text": persisted_log_text,
+        "source_method": source_method,
+        "notes": notes,
+    }
+
+
+def _collect_standalone_session_logs(
+    *, snapshot: Mapping[str, Any] | None = None
+) -> dict[str, Any]:
+    snapshot = snapshot or get_standalone_session_log_snapshot()
+
+    if not snapshot:
+        return {
+            "mode": "standalone",
+            "session_started_at": None,
+            "session_log_text": "",
+            "persistent_log_path": None,
+            "persistent_log_text": "",
+            "source_method": "unavailable",
+            "session_id": None,
+            "notes": ["Standalone session logging was not initialized."],
+        }
+
+    log_file_path = snapshot.get("log_file_path")
+    persisted_log_text = _read_log_file_tail(log_file_path) if log_file_path else ""
+    session_log_text = str(snapshot.get("in_memory_text") or "")
+    source_method = "standalone_memory"
+    if persisted_log_text:
+        source_method = "standalone_session_file"
+    elif session_log_text:
+        source_method = "standalone_memory"
+    else:
+        source_method = "unavailable"
+
+    return {
+        "mode": "standalone",
+        "session_started_at": snapshot.get("started_at"),
+        "session_log_text": session_log_text,
+        "persistent_log_path": log_file_path,
+        "persistent_log_text": persisted_log_text,
+        "source_method": source_method,
+        "session_id": snapshot.get("session_id"),
+        "notes": [],
+    }
+
+
+def _collect_backend_session_logs() -> dict[str, Any]:
+    standalone_mode = os.environ.get("LORA_MANAGER_STANDALONE", "0") == "1"
+    if standalone_mode:
+        return _collect_standalone_session_logs()
+    return _collect_comfyui_session_logs()
+
+
 def _is_wsl() -> bool:
     """Check if running in WSL environment."""
     try:
@@ -272,6 +586,388 @@ class SupportersHandler:
             return web.json_response({"success": False, "error": str(exc)}, status=500)
 
 
+class DoctorHandler:
+    """Run environment diagnostics and export a support bundle."""
+
+    def __init__(
+        self,
+        *,
+        settings_service=None,
+        civitai_client_factory: Callable[[], Awaitable[Any]] = ServiceRegistry.get_civitai_client,
+        scanner_factories: Sequence[tuple[str, str, Callable[[], Awaitable[Any]]]] | None = None,
+        app_version_getter: Callable[[], str] = _get_app_version_string,
+    ) -> None:
+        self._settings = settings_service or get_settings_manager()
+        self._civitai_client_factory = civitai_client_factory
+        self._scanner_factories = tuple(
+            scanner_factories
+            or (
+                ("lora", "LoRAs", ServiceRegistry.get_lora_scanner),
+                ("checkpoint", "Checkpoints", ServiceRegistry.get_checkpoint_scanner),
+                ("embedding", "Embeddings", ServiceRegistry.get_embedding_scanner),
+            )
+        )
+        self._app_version_getter = app_version_getter
+
+    async def get_doctor_diagnostics(self, request: web.Request) -> web.Response:
+        try:
+            client_version = (request.query.get("clientVersion") or "").strip()
+            app_version = self._app_version_getter()
+            diagnostics = [
+                await self._check_civitai_api_key(),
+                await self._check_cache_health(),
+                self._check_ui_version(client_version, app_version),
+            ]
+
+            issue_count = sum(
+                1 for item in diagnostics if item.get("status") in {"warning", "error"}
+            )
+            error_count = sum(1 for item in diagnostics if item.get("status") == "error")
+            warning_count = sum(
+                1 for item in diagnostics if item.get("status") == "warning"
+            )
+
+            overall_status = "ok"
+            if error_count:
+                overall_status = "error"
+            elif warning_count:
+                overall_status = "warning"
+
+            return web.json_response(
+                {
+                    "success": True,
+                    "app_version": app_version,
+                    "summary": {
+                        "status": overall_status,
+                        "issue_count": issue_count,
+                        "warning_count": warning_count,
+                        "error_count": error_count,
+                        "checked_at": datetime.now(timezone.utc).isoformat(),
+                    },
+                    "diagnostics": diagnostics,
+                }
+            )
+        except Exception as exc:  # pragma: no cover - defensive logging
+            logger.error("Error building doctor diagnostics: %s", exc, exc_info=True)
+            return web.json_response({"success": False, "error": str(exc)}, status=500)
+
+    async def repair_doctor_cache(self, request: web.Request) -> web.Response:
+        repaired: list[dict[str, Any]] = []
+        failures: list[dict[str, str]] = []
+
+        for model_type, label, factory in self._scanner_factories:
+            try:
+                scanner = await factory()
+                await scanner.get_cached_data(force_refresh=True, rebuild_cache=True)
+                repaired.append({"model_type": model_type, "label": label})
+            except Exception as exc:  # pragma: no cover - defensive logging
+                logger.error("Doctor cache rebuild failed for %s: %s", model_type, exc, exc_info=True)
+                failures.append(
+                    {
+                        "model_type": model_type,
+                        "label": label,
+                        "error": str(exc),
+                    }
+                )
+
+        status = 200 if not failures else 500
+        return web.json_response(
+            {
+                "success": not failures,
+                "repaired": repaired,
+                "failures": failures,
+            },
+            status=status,
+        )
+
+    async def export_doctor_bundle(self, request: web.Request) -> web.Response:
+        try:
+            payload = await request.json()
+        except Exception:
+            payload = {}
+
+        try:
+            archive_bytes = self._build_support_bundle(payload)
+            timestamp = datetime.now(timezone.utc).strftime("%Y%m%d-%H%M%S")
+            headers = {
+                "Content-Type": "application/zip",
+                "Content-Disposition": f'attachment; filename="lora-manager-doctor-{timestamp}.zip"',
+            }
+            return web.Response(body=archive_bytes, headers=headers)
+        except Exception as exc:  # pragma: no cover - defensive logging
+            logger.error("Error exporting doctor bundle: %s", exc, exc_info=True)
+            return web.json_response({"success": False, "error": str(exc)}, status=500)
+
+    async def _check_civitai_api_key(self) -> dict[str, Any]:
+        api_key = (self._settings.get("civitai_api_key", "") or "").strip()
+        if not api_key:
+            return {
+                "id": "civitai_api_key",
+                "title": "Civitai API Key",
+                "status": "warning",
+                "summary": "Civitai API key is not configured.",
+                "details": [
+                    "Downloads and authenticated Civitai requests may fail until a valid API key is saved."
+                ],
+                "actions": [{"id": "open-settings", "label": "Open Settings"}],
+            }
+
+        obvious_placeholders = {"your_api_key", "changeme", "placeholder", "none"}
+        if api_key.lower() in obvious_placeholders:
+            return {
+                "id": "civitai_api_key",
+                "title": "Civitai API Key",
+                "status": "error",
+                "summary": "Civitai API key looks like a placeholder value.",
+                "details": ["Replace the placeholder with a real key from your Civitai account settings."],
+                "actions": [{"id": "open-settings", "label": "Open Settings"}],
+            }
+
+        try:
+            client = await self._civitai_client_factory()
+            success, result = await client._make_request(  # noqa: SLF001 - internal diagnostic probe
+                "GET",
+                f"{client.base_url}/models",
+                use_auth=True,
+                params={"limit": 1},
+            )
+            if success:
+                return {
+                    "id": "civitai_api_key",
+                    "title": "Civitai API Key",
+                    "status": "ok",
+                    "summary": "Civitai API key is configured and accepted.",
+                    "details": [],
+                    "actions": [{"id": "open-settings", "label": "Open Settings"}],
+                }
+
+            error_text = str(result)
+            lowered = error_text.lower()
+            if any(token in lowered for token in ("401", "403", "unauthorized", "forbidden", "invalid")):
+                return {
+                    "id": "civitai_api_key",
+                    "title": "Civitai API Key",
+                    "status": "error",
+                    "summary": "Configured Civitai API key was rejected.",
+                    "details": [error_text],
+                    "actions": [{"id": "open-settings", "label": "Open Settings"}],
+                }
+
+            return {
+                "id": "civitai_api_key",
+                "title": "Civitai API Key",
+                "status": "warning",
+                "summary": "Unable to confirm whether the Civitai API key is valid.",
+                "details": [error_text],
+                "actions": [{"id": "open-settings", "label": "Open Settings"}],
+            }
+        except Exception as exc:  # pragma: no cover - network/path dependent
+            logger.warning("Doctor API key validation failed: %s", exc)
+            return {
+                "id": "civitai_api_key",
+                "title": "Civitai API Key",
+                "status": "warning",
+                "summary": "Could not validate the Civitai API key right now.",
+                "details": [str(exc)],
+                "actions": [{"id": "open-settings", "label": "Open Settings"}],
+            }
+
+    async def _check_cache_health(self) -> dict[str, Any]:
+        details: list[dict[str, Any]] = []
+        overall_status = "ok"
+        summary = "All model caches look healthy."
+
+        for model_type, label, factory in self._scanner_factories:
+            try:
+                scanner = await factory()
+                persisted = None
+                persistent_cache = getattr(scanner, "_persistent_cache", None)
+                if persistent_cache and hasattr(persistent_cache, "load_cache"):
+                    loop = asyncio.get_event_loop()
+                    persisted = await loop.run_in_executor(
+                        None,
+                        persistent_cache.load_cache,
+                        getattr(scanner, "model_type", model_type),
+                    )
+
+                raw_data = list(getattr(persisted, "raw_data", None) or [])
+                if not raw_data:
+                    cache = await scanner.get_cached_data(force_refresh=False)
+                    raw_data = list(getattr(cache, "raw_data", None) or [])
+
+                report = CacheHealthMonitor().check_health(raw_data, auto_repair=False)
+                report_status = "ok"
+                if report.status == CacheHealthStatus.CORRUPTED:
+                    report_status = "error"
+                elif report.status != CacheHealthStatus.HEALTHY:
+                    report_status = "warning"
+
+                details.append(
+                    {
+                        "model_type": model_type,
+                        "label": label,
+                        "status": report_status,
+                        "message": report.message,
+                        "total_entries": report.total_entries,
+                        "invalid_entries": report.invalid_entries,
+                        "repaired_entries": report.repaired_entries,
+                        "corruption_rate": f"{report.corruption_rate:.1%}",
+                    }
+                )
+
+                if report_status == "error":
+                    overall_status = "error"
+                elif report_status == "warning" and overall_status == "ok":
+                    overall_status = "warning"
+            except Exception as exc:  # pragma: no cover - defensive logging
+                logger.error("Doctor cache health check failed for %s: %s", model_type, exc, exc_info=True)
+                details.append(
+                    {
+                        "model_type": model_type,
+                        "label": label,
+                        "status": "error",
+                        "message": str(exc),
+                    }
+                )
+                overall_status = "error"
+
+        if overall_status == "warning":
+            summary = "One or more model caches contain invalid entries."
+        elif overall_status == "error":
+            summary = "One or more model caches are corrupted or unavailable."
+
+        return {
+            "id": "cache_health",
+            "title": "Model Cache Health",
+            "status": overall_status,
+            "summary": summary,
+            "details": details,
+            "actions": [{"id": "repair-cache", "label": "Rebuild Cache"}],
+        }
+
+    def _check_ui_version(self, client_version: str, app_version: str) -> dict[str, Any]:
+        if client_version and client_version != app_version:
+            return {
+                "id": "ui_version",
+                "title": "UI Version",
+                "status": "warning",
+                "summary": "Browser is running an older UI bundle than the backend expects.",
+                "details": [
+                    {
+                        "client_version": client_version,
+                        "server_version": app_version,
+                    }
+                ],
+                "actions": [{"id": "reload-page", "label": "Reload UI"}],
+            }
+
+        return {
+            "id": "ui_version",
+            "title": "UI Version",
+            "status": "ok",
+            "summary": "Browser UI bundle matches the backend version.",
+            "details": [
+                {
+                    "client_version": client_version or app_version,
+                    "server_version": app_version,
+                }
+            ],
+            "actions": [{"id": "reload-page", "label": "Reload UI"}],
+        }
+
+    def _collect_backend_session_logs(self) -> dict[str, Any]:
+        return _collect_backend_session_logs()
+
+    def _build_support_bundle(self, payload: dict[str, Any]) -> bytes:
+        diagnostics = payload.get("diagnostics") or []
+        frontend_logs = payload.get("frontend_logs") or []
+        client_context = payload.get("client_context") or {}
+
+        app_version = self._app_version_getter()
+        settings_snapshot = _sanitize_sensitive_data(
+            getattr(self._settings, "settings", {}) or {}
+        )
+        startup_messages_getter = getattr(self._settings, "get_startup_messages", None)
+        startup_messages = (
+            list(startup_messages_getter()) if callable(startup_messages_getter) else []
+        )
+
+        environment = {
+            "app_version": app_version,
+            "python_version": sys.version,
+            "platform": platform.platform(),
+            "cwd": os.getcwd(),
+            "standalone_mode": os.environ.get("LORA_MANAGER_STANDALONE", "0") == "1",
+            "settings_file": getattr(self._settings, "settings_file", None),
+            "exported_at": datetime.now(timezone.utc).isoformat(),
+            "client_context": client_context,
+        }
+        backend_logs = self._collect_backend_session_logs()
+        backend_session_text = _sanitize_sensitive_text(
+            str(backend_logs.get("session_log_text") or "")
+        )
+        backend_persisted_text = _sanitize_sensitive_text(
+            str(backend_logs.get("persistent_log_text") or "")
+        )
+        if not backend_session_text and backend_persisted_text:
+            backend_session_text = backend_persisted_text
+        if not backend_session_text:
+            backend_session_text = "No current backend session logs were available.\n"
+
+        buffer = io.BytesIO()
+        with zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED) as archive:
+            archive.writestr(
+                "doctor-report.json",
+                json.dumps(
+                    {
+                        "app_version": app_version,
+                        "diagnostics": diagnostics,
+                        "summary": payload.get("summary"),
+                    },
+                    indent=2,
+                    ensure_ascii=False,
+                ),
+            )
+            archive.writestr(
+                "settings-sanitized.json",
+                json.dumps(settings_snapshot, indent=2, ensure_ascii=False),
+            )
+            archive.writestr(
+                "startup-messages.json",
+                json.dumps(startup_messages, indent=2, ensure_ascii=False),
+            )
+            archive.writestr(
+                "environment.json",
+                json.dumps(environment, indent=2, ensure_ascii=False),
+            )
+            archive.writestr(
+                "frontend-console.json",
+                json.dumps(_sanitize_sensitive_data(frontend_logs), indent=2, ensure_ascii=False),
+            )
+            archive.writestr("backend-logs.txt", backend_session_text)
+            archive.writestr(
+                "backend-log-source.json",
+                json.dumps(
+                    _sanitize_sensitive_data(
+                        {
+                            "mode": backend_logs.get("mode"),
+                            "source_method": backend_logs.get("source_method"),
+                            "session_started_at": backend_logs.get("session_started_at"),
+                            "session_id": backend_logs.get("session_id"),
+                            "persistent_log_path": backend_logs.get("persistent_log_path"),
+                            "notes": backend_logs.get("notes") or [],
+                        }
+                    ),
+                    indent=2,
+                    ensure_ascii=False,
+                ),
+            )
+            if backend_persisted_text:
+                archive.writestr("backend-session-file-tail.txt", backend_persisted_text)
+
+        return buffer.getvalue()
+
+
 class ExampleWorkflowsHandler:
     """Handler for example workflow templates."""
 
@@ -2022,6 +2718,7 @@ class MiscHandlerSet:
         filesystem: FileSystemHandler,
         custom_words: CustomWordsHandler,
         supporters: SupportersHandler,
+        doctor: DoctorHandler,
         example_workflows: ExampleWorkflowsHandler,
         base_model: BaseModelHandlerSet,
     ) -> None:
@@ -2038,6 +2735,7 @@ class MiscHandlerSet:
         self.filesystem = filesystem
         self.custom_words = custom_words
         self.supporters = supporters
+        self.doctor = doctor
         self.example_workflows = example_workflows
         self.base_model = base_model
 
@@ -2048,6 +2746,9 @@ class MiscHandlerSet:
             "health_check": self.health.health_check,
             "get_settings": self.settings.get_settings,
             "update_settings": self.settings.update_settings,
+            "get_doctor_diagnostics": self.doctor.get_doctor_diagnostics,
+            "repair_doctor_cache": self.doctor.repair_doctor_cache,
+            "export_doctor_bundle": self.doctor.export_doctor_bundle,
             "get_priority_tags": self.settings.get_priority_tags,
             "get_settings_libraries": self.settings.get_libraries,
             "activate_library": self.settings.activate_library,

py/routes/misc_route_registrar.py

@@ -22,6 +22,9 @@ class RouteDefinition:
 MISC_ROUTE_DEFINITIONS: tuple[RouteDefinition, ...] = (
     RouteDefinition("GET", "/api/lm/settings", "get_settings"),
     RouteDefinition("POST", "/api/lm/settings", "update_settings"),
+    RouteDefinition("GET", "/api/lm/doctor/diagnostics", "get_doctor_diagnostics"),
+    RouteDefinition("POST", "/api/lm/doctor/repair-cache", "repair_doctor_cache"),
+    RouteDefinition("POST", "/api/lm/doctor/export-bundle", "export_doctor_bundle"),
     RouteDefinition("GET", "/api/lm/priority-tags", "get_priority_tags"),
     RouteDefinition("GET", "/api/lm/settings/libraries", "get_settings_libraries"),
     RouteDefinition("POST", "/api/lm/settings/libraries/activate", "activate_library"),

py/routes/misc_routes.py

@@ -19,6 +19,7 @@ from ..services.downloader import get_downloader
 from ..utils.usage_stats import UsageStats
 from .handlers.misc_handlers import (
     CustomWordsHandler,
+    DoctorHandler,
     ExampleWorkflowsHandler,
     FileSystemHandler,
     HealthCheckHandler,
@@ -130,6 +131,7 @@ class MiscRoutes:
         )
         custom_words = CustomWordsHandler()
         supporters = SupportersHandler()
+        doctor = DoctorHandler(settings_service=self._settings)
         example_workflows = ExampleWorkflowsHandler()
         base_model = BaseModelHandlerSet()
 
@@ -147,6 +149,7 @@ class MiscRoutes:
             filesystem=filesystem,
             custom_words=custom_words,
             supporters=supporters,
+            doctor=doctor,
             example_workflows=example_workflows,
             base_model=base_model,
         )

py/utils/session_logging.py

@@ -0,0 +1,136 @@
+from __future__ import annotations
+
+import logging
+import os
+import threading
+import uuid
+from collections import deque
+from dataclasses import dataclass
+from datetime import datetime, timezone
+from typing import Any
+
+
+LOG_FORMAT = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+_SESSION_HANDLER_NAME = "lora_manager_standalone_session_memory"
+_FILE_HANDLER_NAME = "lora_manager_standalone_session_file"
+_session_state: "StandaloneSessionLogState | None" = None
+_session_lock = threading.Lock()
+
+
+@dataclass
+class StandaloneSessionLogState:
+    started_at: str
+    session_id: str
+    log_file_path: str | None
+    memory_handler: "StandaloneSessionMemoryHandler"
+
+
+class StandaloneSessionMemoryHandler(logging.Handler):
+    def __init__(self, capacity: int = 4000) -> None:
+        super().__init__()
+        self._entries: deque[str] = deque(maxlen=capacity)
+        self._lock = threading.Lock()
+
+    def emit(self, record: logging.LogRecord) -> None:
+        try:
+            rendered = self.format(record)
+        except Exception:
+            rendered = record.getMessage()
+
+        with self._lock:
+            self._entries.append(rendered)
+
+    def render(self, max_lines: int | None = None) -> str:
+        with self._lock:
+            entries = list(self._entries)
+
+        if max_lines is not None and max_lines > 0:
+            entries = entries[-max_lines:]
+
+        if not entries:
+            return ""
+
+        return "\n".join(entries) + "\n"
+
+
+def _build_log_file_path(settings_file: str | None, started_at: datetime) -> str | None:
+    if not settings_file:
+        return None
+
+    settings_dir = os.path.dirname(os.path.abspath(settings_file))
+    log_dir = os.path.join(settings_dir, "logs")
+    os.makedirs(log_dir, exist_ok=True)
+    timestamp = started_at.strftime("%Y%m%dT%H%M%SZ")
+    return os.path.join(log_dir, f"standalone-session-{timestamp}.log")
+
+
+def setup_standalone_session_logging(settings_file: str | None) -> StandaloneSessionLogState:
+    global _session_state
+
+    with _session_lock:
+        if _session_state is not None:
+            return _session_state
+
+        started_dt = datetime.now(timezone.utc)
+        started_at = started_dt.replace(microsecond=0).isoformat()
+        session_id = f"{started_dt.strftime('%Y%m%dT%H%M%SZ')}-{uuid.uuid4().hex[:8]}"
+        formatter = logging.Formatter(LOG_FORMAT)
+        root_logger = logging.getLogger()
+        if root_logger.level > logging.INFO:
+            root_logger.setLevel(logging.INFO)
+
+        memory_handler = StandaloneSessionMemoryHandler()
+        memory_handler.set_name(_SESSION_HANDLER_NAME)
+        memory_handler.setFormatter(formatter)
+        root_logger.addHandler(memory_handler)
+
+        log_file_path = _build_log_file_path(settings_file, started_dt)
+        if log_file_path:
+            file_handler = logging.FileHandler(log_file_path, encoding="utf-8")
+            file_handler.set_name(_FILE_HANDLER_NAME)
+            file_handler.setFormatter(formatter)
+            root_logger.addHandler(file_handler)
+
+        _session_state = StandaloneSessionLogState(
+            started_at=started_at,
+            session_id=session_id,
+            log_file_path=log_file_path,
+            memory_handler=memory_handler,
+        )
+
+    logger = logging.getLogger("lora-manager-standalone")
+    logger.info("LoRA Manager standalone startup time: %s", started_at)
+    logger.info("LoRA Manager standalone session id: %s", session_id)
+    if log_file_path:
+        logger.info("LoRA Manager standalone session log path: %s", log_file_path)
+
+    return _session_state
+
+
+def get_standalone_session_log_snapshot(max_lines: int = 2000) -> dict[str, Any] | None:
+    state = _session_state
+    if state is None:
+        return None
+
+    return {
+        "started_at": state.started_at,
+        "session_id": state.session_id,
+        "log_file_path": state.log_file_path,
+        "in_memory_text": state.memory_handler.render(max_lines=max_lines),
+    }
+
+
+def reset_standalone_session_logging_for_tests() -> None:
+    global _session_state
+
+    with _session_lock:
+        root_logger = logging.getLogger()
+        handlers_to_remove = [
+            handler
+            for handler in root_logger.handlers
+            if handler.get_name() in {_SESSION_HANDLER_NAME, _FILE_HANDLER_NAME}
+        ]
+        for handler in handlers_to_remove:
+            root_logger.removeHandler(handler)
+            handler.close()
+        _session_state = None

standalone.py

@@ -113,6 +113,8 @@ import asyncio
 import logging
 from aiohttp import web
 
+from py.utils.session_logging import setup_standalone_session_logging
+
 # Increase allowable header size to align with in-ComfyUI configuration.
 HEADER_SIZE_LIMIT = 16384
 
@@ -125,6 +127,8 @@ logger = logging.getLogger("lora-manager-standalone")
 # Configure aiohttp access logger to be less verbose
 logging.getLogger("aiohttp.access").setLevel(logging.WARNING)
 
+setup_standalone_session_logging(ensure_settings_file(logger))
+
 
 # Add specific suppression for connection reset errors
 class ConnectionResetFilter(logging.Filter):

static/css/components/modal/doctor-modal.css

@@ -0,0 +1,278 @@
+.doctor-trigger {
+    min-width: 120px;
+    position: relative;
+    border-color: color-mix(in srgb, var(--lora-accent) 24%, var(--border-color));
+}
+
+.doctor-trigger i {
+    color: var(--lora-accent);
+}
+
+.doctor-status-badge {
+    min-width: 18px;
+    height: 18px;
+    padding: 0 5px;
+    border-radius: 999px;
+    background: var(--lora-error);
+    color: #fff;
+    font-size: 11px;
+    line-height: 18px;
+    font-weight: 700;
+}
+
+.doctor-status-badge.hidden {
+    display: none;
+}
+
+.doctor-modal {
+    width: min(960px, 92vw);
+    max-width: 960px;
+}
+
+.doctor-shell {
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-3);
+    padding-top: var(--space-2);
+}
+
+.doctor-hero {
+    display: flex;
+    justify-content: space-between;
+    gap: var(--space-3);
+    align-items: flex-start;
+    margin-top: var(--space-2);
+    padding: var(--space-3);
+    border-radius: var(--border-radius-sm);
+    border: 1px solid var(--lora-border);
+    background: rgba(0, 0, 0, 0.03);
+    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
+}
+
+.doctor-kicker {
+    display: inline-block;
+    font-size: 0.75rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    color: var(--lora-accent);
+    margin-bottom: 6px;
+}
+
+.doctor-hero h2 {
+    margin: 0 0 8px;
+}
+
+.doctor-hero p {
+    margin: 0;
+    color: var(--text-color);
+    opacity: 0.88;
+}
+
+.doctor-summary-badge {
+    display: inline-flex;
+    align-items: center;
+    gap: 8px;
+    border-radius: 999px;
+    padding: 8px 12px;
+    font-weight: 700;
+    white-space: nowrap;
+    border: 1px solid transparent;
+}
+
+.doctor-status-ok {
+    background: color-mix(in oklch, var(--lora-success) 14%, transparent);
+    border-color: color-mix(in oklch, var(--lora-success) 28%, transparent);
+    color: color-mix(in oklch, var(--lora-success) 72%, var(--text-color));
+}
+
+.doctor-status-warning {
+    background: color-mix(in oklch, var(--lora-warning) 16%, transparent);
+    border-color: color-mix(in oklch, var(--lora-warning) 30%, transparent);
+    color: color-mix(in oklch, var(--lora-warning) 70%, var(--text-color));
+}
+
+.doctor-status-error {
+    background: color-mix(in oklch, var(--lora-error) 16%, transparent);
+    border-color: color-mix(in oklch, var(--lora-error) 30%, transparent);
+    color: color-mix(in oklch, var(--lora-error) 68%, var(--text-color));
+}
+
+.doctor-loading-state {
+    display: inline-flex;
+    align-items: center;
+    gap: 10px;
+    padding: 12px 16px;
+    min-height: 22px;
+    border-radius: var(--border-radius-sm);
+    background: var(--lora-surface);
+    border: 1px solid var(--lora-border);
+    visibility: hidden;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.18s ease, visibility 0.18s ease;
+}
+
+.doctor-loading-state.visible {
+    visibility: visible;
+    opacity: 1;
+}
+
+.doctor-issues-list {
+    display: grid;
+    gap: var(--space-2);
+}
+
+.doctor-issue-card {
+    border: 1px solid rgba(0, 0, 0, 0.1);
+    background: rgba(0, 0, 0, 0.03);
+    border-radius: var(--border-radius-sm);
+    padding: var(--space-3);
+    box-shadow: none;
+}
+
+.doctor-issue-card[data-status="warning"] {
+    border-color: color-mix(in oklch, var(--lora-warning) 32%, var(--lora-border));
+}
+
+.doctor-issue-card[data-status="error"] {
+    border-color: color-mix(in oklch, var(--lora-error) 28%, var(--lora-border));
+}
+
+.doctor-issue-header {
+    display: flex;
+    justify-content: space-between;
+    gap: var(--space-2);
+    align-items: flex-start;
+}
+
+.doctor-issue-header h3 {
+    margin: 0 0 6px;
+    font-size: 1rem;
+}
+
+.doctor-issue-summary {
+    margin: 0;
+    color: var(--text-color);
+    opacity: 0.92;
+}
+
+.doctor-issue-tag {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    border-radius: 999px;
+    padding: 6px 10px;
+    font-size: 0.8rem;
+    font-weight: 700;
+}
+
+.doctor-issue-card[data-status="ok"] .doctor-issue-tag {
+    background: color-mix(in oklch, var(--lora-success) 14%, transparent);
+    color: color-mix(in oklch, var(--lora-success) 72%, var(--text-color));
+}
+
+.doctor-issue-card[data-status="warning"] .doctor-issue-tag {
+    background: color-mix(in oklch, var(--lora-warning) 16%, transparent);
+    color: color-mix(in oklch, var(--lora-warning) 70%, var(--text-color));
+}
+
+.doctor-issue-card[data-status="error"] .doctor-issue-tag {
+    background: color-mix(in oklch, var(--lora-error) 16%, transparent);
+    color: color-mix(in oklch, var(--lora-error) 68%, var(--text-color));
+}
+
+.doctor-issue-details {
+    margin: 14px 0 0;
+    padding-left: 18px;
+    color: var(--text-color);
+}
+
+.doctor-issue-details li + li {
+    margin-top: 8px;
+}
+
+.doctor-issue-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin-top: 16px;
+}
+
+.doctor-inline-detail-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
+    gap: 10px;
+    margin-top: 14px;
+}
+
+.doctor-inline-detail {
+    padding: 10px 12px;
+    border-radius: var(--border-radius-xs);
+    background: var(--lora-surface);
+    border: 1px solid var(--lora-border);
+}
+
+.doctor-inline-detail strong {
+    display: block;
+    margin-bottom: 4px;
+    font-size: 0.82rem;
+}
+
+.doctor-footer {
+    display: flex;
+    justify-content: space-between;
+    gap: var(--space-2);
+    align-items: center;
+    padding-top: var(--space-1);
+}
+
+.doctor-footer-note {
+    color: var(--text-color);
+    opacity: 0.82;
+}
+
+.doctor-footer-actions {
+    display: flex;
+    gap: 10px;
+}
+
+[data-theme="dark"] .doctor-hero,
+[data-theme="dark"] .doctor-issue-card {
+    background: rgba(255, 255, 255, 0.03);
+    border-color: var(--lora-border);
+    box-shadow: none;
+}
+
+@media (max-width: 760px) {
+    .doctor-trigger {
+        min-width: auto;
+        padding-inline: 10px;
+    }
+
+    .doctor-trigger span:not(.doctor-status-badge) {
+        display: none;
+    }
+
+    .doctor-hero,
+    .doctor-footer {
+        flex-direction: column;
+        align-items: stretch;
+    }
+
+    .doctor-hero {
+        padding-right: var(--space-3);
+    }
+
+    .doctor-summary-badge {
+        align-self: flex-start;
+    }
+
+    .doctor-footer-actions {
+        width: 100%;
+    }
+
+    .doctor-footer-actions button {
+        flex: 1;
+    }
+}

static/css/style.css

@@ -12,6 +12,7 @@
 @import 'components/modal/delete-modal.css';
 @import 'components/modal/update-modal.css';
 @import 'components/modal/settings-modal.css';
+@import 'components/modal/doctor-modal.css';
 @import 'components/modal/help-modal.css';
 @import 'components/modal/relink-civitai-modal.css';
 @import 'components/modal/example-access-modal.css';

static/js/core.js

@@ -9,6 +9,7 @@ import { moveManager } from './managers/MoveManager.js';
 import { bulkManager } from './managers/BulkManager.js';
 import { ExampleImagesManager } from './managers/ExampleImagesManager.js';
 import { helpManager } from './managers/HelpManager.js';
+import { doctorManager } from './managers/DoctorManager.js';
 import { bannerService } from './managers/BannerService.js';
 import { initTheme, initBackToTop } from './utils/uiHelpers.js';
 import { initializeInfiniteScroll } from './utils/infiniteScroll.js';
@@ -58,6 +59,7 @@ export class AppCore {
         const exampleImagesManager = new ExampleImagesManager();
         window.exampleImagesManager = exampleImagesManager;
         window.helpManager = helpManager;
+        window.doctorManager = doctorManager;
         window.moveManager = moveManager;
         window.bulkManager = bulkManager;
         
@@ -77,6 +79,7 @@ export class AppCore {
         exampleImagesManager.initialize();
         // Initialize the help manager
         helpManager.initialize();
+        doctorManager.initialize();
 
         const cardInfoDisplay = state.global.settings.card_info_display || 'always';
         document.body.classList.toggle('hover-reveal', cardInfoDisplay === 'hover');

static/js/managers/DoctorManager.js

@@ -0,0 +1,387 @@
+import { modalManager } from './ModalManager.js';
+import { showToast } from '../utils/uiHelpers.js';
+import { translate } from '../utils/i18nHelpers.js';
+import { escapeHtml } from '../components/shared/utils.js';
+
+const MAX_CONSOLE_ENTRIES = 200;
+
+function stringifyConsoleArg(value) {
+    if (typeof value === 'string') {
+        return value;
+    }
+
+    try {
+        return JSON.stringify(value);
+    } catch (_error) {
+        return String(value);
+    }
+}
+
+export class DoctorManager {
+    constructor() {
+        this.initialized = false;
+        this.lastDiagnostics = null;
+        this.consoleEntries = [];
+    }
+
+    initialize() {
+        if (this.initialized) {
+            return;
+        }
+
+        this.triggerButton = document.getElementById('doctorTriggerBtn');
+        this.badge = document.getElementById('doctorStatusBadge');
+        this.modal = document.getElementById('doctorModal');
+        this.issuesList = document.getElementById('doctorIssuesList');
+        this.summaryText = document.getElementById('doctorSummaryText');
+        this.summaryBadge = document.getElementById('doctorSummaryBadge');
+        this.loadingState = document.getElementById('doctorLoadingState');
+        this.refreshButton = document.getElementById('doctorRefreshBtn');
+        this.exportButton = document.getElementById('doctorExportBtn');
+
+        this.installConsoleCapture();
+        this.bindEvents();
+        this.initialized = true;
+    }
+
+    bindEvents() {
+        if (this.triggerButton) {
+            this.triggerButton.addEventListener('click', async () => {
+                modalManager.showModal('doctorModal');
+                await this.refreshDiagnostics();
+            });
+        }
+
+        if (this.refreshButton) {
+            this.refreshButton.addEventListener('click', async () => {
+                await this.refreshDiagnostics();
+            });
+        }
+
+        if (this.exportButton) {
+            this.exportButton.addEventListener('click', async () => {
+                await this.exportBundle();
+            });
+        }
+    }
+
+    installConsoleCapture() {
+        if (window.__lmDoctorConsolePatched) {
+            this.consoleEntries = window.__lmDoctorConsoleEntries || [];
+            return;
+        }
+
+        const originalConsole = {};
+        const levels = ['log', 'info', 'warn', 'error', 'debug'];
+        window.__lmDoctorConsoleEntries = this.consoleEntries;
+
+        levels.forEach((level) => {
+            const original = console[level]?.bind(console);
+            originalConsole[level] = original;
+
+            console[level] = (...args) => {
+                this.consoleEntries.push({
+                    level,
+                    timestamp: new Date().toISOString(),
+                    message: args.map(stringifyConsoleArg).join(' '),
+                });
+
+                if (this.consoleEntries.length > MAX_CONSOLE_ENTRIES) {
+                    this.consoleEntries.splice(0, this.consoleEntries.length - MAX_CONSOLE_ENTRIES);
+                }
+
+                if (original) {
+                    original(...args);
+                }
+            };
+        });
+
+        window.__lmDoctorConsolePatched = true;
+    }
+
+    getClientVersion() {
+        return document.body?.dataset?.appVersion || '';
+    }
+
+    setLoading(isLoading) {
+        if (this.loadingState) {
+            this.loadingState.classList.toggle('visible', isLoading);
+        }
+        if (this.refreshButton) {
+            this.refreshButton.disabled = isLoading;
+        }
+        if (this.exportButton) {
+            this.exportButton.disabled = isLoading;
+        }
+    }
+
+    async refreshDiagnostics({ silent = false } = {}) {
+        this.setLoading(true);
+        try {
+            const clientVersion = encodeURIComponent(this.getClientVersion());
+            const response = await fetch(`/api/lm/doctor/diagnostics?clientVersion=${clientVersion}`);
+            const payload = await response.json();
+
+            if (!response.ok || payload.success === false) {
+                throw new Error(payload.error || 'Failed to load doctor diagnostics');
+            }
+
+            this.lastDiagnostics = payload;
+            this.updateTriggerState(payload.summary);
+            this.renderDiagnostics(payload);
+        } catch (error) {
+            console.error('Doctor diagnostics failed:', error);
+            if (!silent) {
+                showToast('doctor.toast.loadFailed', { message: error.message }, 'error');
+            }
+        } finally {
+            this.setLoading(false);
+        }
+    }
+
+    updateTriggerState(summary = {}) {
+        if (!this.badge || !this.triggerButton) {
+            return;
+        }
+
+        const issueCount = Number(summary.issue_count || 0);
+        this.badge.textContent = issueCount > 9 ? '9+' : String(issueCount);
+        this.badge.classList.toggle('hidden', issueCount === 0);
+
+        this.triggerButton.classList.remove('doctor-status-warning', 'doctor-status-error');
+        if (summary.status === 'error') {
+            this.triggerButton.classList.add('doctor-status-error');
+        } else if (summary.status === 'warning') {
+            this.triggerButton.classList.add('doctor-status-warning');
+        }
+    }
+
+    renderDiagnostics(payload) {
+        if (!this.modal || !this.issuesList || !this.summaryText || !this.summaryBadge) {
+            return;
+        }
+
+        const { summary = {}, diagnostics = [] } = payload;
+        this.summaryText.textContent = this.getSummaryText(summary);
+        this.summaryBadge.className = `doctor-summary-badge ${this.getStatusClass(summary.status)}`;
+        this.summaryBadge.innerHTML = `
+            <i class="fas ${summary.status === 'error' ? 'fa-triangle-exclamation' : summary.status === 'warning' ? 'fa-stethoscope' : 'fa-heartbeat'}"></i>
+            <span>${escapeHtml(this.getStatusLabel(summary.status))}</span>
+        `;
+
+        this.issuesList.innerHTML = diagnostics.map((item) => this.renderIssueCard(item)).join('');
+        this.attachIssueActions();
+    }
+
+    getSummaryText(summary) {
+        if (summary.status === 'error') {
+            return translate(
+                'doctor.summary.error',
+                { count: summary.issue_count || 0 },
+                `${summary.issue_count || 0} issue(s) need attention before the app is fully healthy.`
+            );
+        }
+
+        if (summary.status === 'warning') {
+            return translate(
+                'doctor.summary.warning',
+                { count: summary.issue_count || 0 },
+                `${summary.issue_count || 0} issue(s) were found. Most can be fixed directly from this panel.`
+            );
+        }
+
+        return translate(
+            'doctor.summary.ok',
+            {},
+            'No active issues were found in the current environment.'
+        );
+    }
+
+    getStatusClass(status) {
+        if (status === 'error') {
+            return 'doctor-status-error';
+        }
+        if (status === 'warning') {
+            return 'doctor-status-warning';
+        }
+        return 'doctor-status-ok';
+    }
+
+    getStatusLabel(status) {
+        return translate(`doctor.status.${status || 'ok'}`, {}, status || 'ok');
+    }
+
+    renderIssueCard(item) {
+        const status = item.status || 'ok';
+        const tagLabel = this.getStatusLabel(status);
+        const details = Array.isArray(item.details) ? item.details : [];
+        const listItems = details
+            .filter((detail) => typeof detail === 'string')
+            .map((detail) => `<li>${escapeHtml(detail)}</li>`)
+            .join('');
+        const inlineDetails = details
+            .filter((detail) => detail && typeof detail === 'object')
+            .map((detail) => this.renderInlineDetail(detail))
+            .join('');
+        const actions = (item.actions || [])
+            .map((action) => `
+                <button class="${action.id === 'repair-cache' || action.id === 'reload-page' ? 'primary-btn' : 'secondary-btn'}" data-doctor-action="${escapeHtml(action.id)}">
+                    ${escapeHtml(action.label)}
+                </button>
+            `)
+            .join('');
+
+        return `
+            <section class="doctor-issue-card" data-status="${escapeHtml(status)}" data-issue-id="${escapeHtml(item.id || '')}">
+                <div class="doctor-issue-header">
+                    <div>
+                        <h3>${escapeHtml(item.title || '')}</h3>
+                        <p class="doctor-issue-summary">${escapeHtml(item.summary || '')}</p>
+                    </div>
+                    <span class="doctor-issue-tag">${escapeHtml(tagLabel)}</span>
+                </div>
+                ${inlineDetails ? `<div class="doctor-inline-detail-grid">${inlineDetails}</div>` : ''}
+                ${listItems ? `<ul class="doctor-issue-details">${listItems}</ul>` : ''}
+                ${actions ? `<div class="doctor-issue-actions">${actions}</div>` : ''}
+            </section>
+        `;
+    }
+
+    renderInlineDetail(detail) {
+        if (detail.client_version || detail.server_version) {
+            return `
+                <div class="doctor-inline-detail">
+                    <strong>${escapeHtml(translate('common.status.version', {}, 'Version'))}</strong>
+                    <div>${escapeHtml(`Client: ${detail.client_version || 'unknown'}`)}</div>
+                    <div>${escapeHtml(`Server: ${detail.server_version || 'unknown'}`)}</div>
+                </div>
+            `;
+        }
+
+        const label = detail.label || detail.model_type || detail.client_version || detail.server_version || 'Detail';
+        const message = detail.message
+            || detail.corruption_rate
+            || detail.server_version
+            || detail.client_version
+            || '';
+
+        if (detail.model_type) {
+            return `
+                <div class="doctor-inline-detail">
+                    <strong>${escapeHtml(detail.label || detail.model_type)}</strong>
+                    <div>${escapeHtml(detail.message || '')}</div>
+                    ${detail.corruption_rate ? `<div>${escapeHtml(detail.corruption_rate)} invalid</div>` : ''}
+                </div>
+            `;
+        }
+
+        return `
+            <div class="doctor-inline-detail">
+                <strong>${escapeHtml(label)}</strong>
+                <div>${escapeHtml(message)}</div>
+            </div>
+        `;
+    }
+
+    attachIssueActions() {
+        this.issuesList.querySelectorAll('[data-doctor-action]').forEach((button) => {
+            button.addEventListener('click', async (event) => {
+                const action = event.currentTarget.dataset.doctorAction;
+                await this.handleAction(action);
+            });
+        });
+    }
+
+    async handleAction(action) {
+        switch (action) {
+            case 'open-settings':
+                modalManager.showModal('settingsModal');
+                window.setTimeout(() => {
+                    const input = document.getElementById('civitaiApiKey');
+                    if (input) {
+                        input.focus();
+                        input.scrollIntoView({ behavior: 'smooth', block: 'center' });
+                    }
+                }, 100);
+                break;
+            case 'repair-cache':
+                await this.repairCache();
+                break;
+            case 'reload-page':
+                window.location.reload();
+                break;
+            default:
+                break;
+        }
+    }
+
+    async repairCache() {
+        try {
+            this.setLoading(true);
+            const response = await fetch('/api/lm/doctor/repair-cache', { method: 'POST' });
+            const payload = await response.json();
+
+            if (!response.ok || payload.success === false) {
+                throw new Error(payload.error || translate('doctor.toast.repairFailed', {}, 'Cache rebuild failed.'));
+            }
+
+            showToast('doctor.toast.repairSuccess', {}, 'success');
+            await this.refreshDiagnostics({ silent: true });
+        } catch (error) {
+            console.error('Doctor cache repair failed:', error);
+            showToast('doctor.toast.repairFailed', { message: error.message }, 'error');
+        } finally {
+            this.setLoading(false);
+        }
+    }
+
+    async exportBundle() {
+        try {
+            this.setLoading(true);
+            const response = await fetch('/api/lm/doctor/export-bundle', {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({
+                    summary: this.lastDiagnostics?.summary || null,
+                    diagnostics: this.lastDiagnostics?.diagnostics || [],
+                    frontend_logs: this.consoleEntries,
+                    client_context: {
+                        url: window.location.href,
+                        user_agent: navigator.userAgent,
+                        language: navigator.language,
+                        app_version: this.getClientVersion(),
+                    },
+                }),
+            });
+
+            if (!response.ok) {
+                const payload = await response.json().catch(() => ({}));
+                throw new Error(payload.error || 'Failed to export diagnostics bundle');
+            }
+
+            const blob = await response.blob();
+            const disposition = response.headers.get('Content-Disposition') || '';
+            const match = disposition.match(/filename=\"([^\"]+)\"/);
+            const filename = match?.[1] || 'lora-manager-doctor.zip';
+            const url = URL.createObjectURL(blob);
+            const anchor = document.createElement('a');
+            anchor.href = url;
+            anchor.download = filename;
+            document.body.appendChild(anchor);
+            anchor.click();
+            anchor.remove();
+            URL.revokeObjectURL(url);
+
+            showToast('doctor.toast.exportSuccess', {}, 'success');
+        } catch (error) {
+            console.error('Doctor export failed:', error);
+            showToast('doctor.toast.exportFailed', { message: error.message }, 'error');
+        } finally {
+            this.setLoading(false);
+        }
+    }
+}
+
+export const doctorManager = new DoctorManager();

static/js/managers/ModalManager.js

@@ -84,6 +84,18 @@ export class ModalManager {
             });
         }
 
+        const doctorModal = document.getElementById('doctorModal');
+        if (doctorModal) {
+            this.registerModal('doctorModal', {
+                element: doctorModal,
+                onClose: () => {
+                    this.getModal('doctorModal').element.style.display = 'none';
+                    document.body.classList.remove('modal-open');
+                },
+                closeOnOutsideClick: true
+            });
+        }
+
         // Add moveModal registration
         const moveModal = document.getElementById('moveModal');
         if (moveModal) {

templates/base.html

@@ -62,7 +62,7 @@
 </head>
 
 {% set page_id = self.page_id() %}
-<body data-page="{{ page_id }}">
+<body data-page="{{ page_id }}" data-app-version="{{ version }}">
     <!-- Header is always visible, even during initialization -->
     {% include 'components/header.html' %}
 

templates/components/controls.html

@@ -84,6 +84,13 @@
         </div>
         
         <div class="controls-right">
+            <div class="control-group doctor-control-group">
+                <button id="doctorTriggerBtn" class="doctor-trigger" title="{{ t('doctor.buttonTitle', default='Run diagnostics and common fixes') }}">
+                    <i class="fas fa-stethoscope"></i>
+                    <span>{{ t('doctor.title', default='Doctor') }}</span>
+                    <span id="doctorStatusBadge" class="doctor-status-badge hidden" aria-hidden="true"></span>
+                </button>
+            </div>
             <div class="keyboard-nav-hint tooltip">
                 <i class="fas fa-keyboard"></i>
                 <span class="tooltiptext">

templates/components/modals.html

@@ -3,6 +3,7 @@
 
 {% include 'components/modals/confirm_modals.html' %}
 {% include 'components/modals/settings_modal.html' %}
+{% include 'components/modals/doctor_modal.html' %}
 {% include 'components/modals/support_modal.html' %}
 {% include 'components/modals/update_modal.html' %}
 {% include 'components/modals/help_modal.html' %}

templates/components/modals/doctor_modal.html

@@ -0,0 +1,40 @@
+<div id="doctorModal" class="modal">
+    <div class="modal-content doctor-modal">
+        <button class="close" onclick="modalManager.closeModal('doctorModal')">&times;</button>
+
+        <div class="doctor-shell">
+            <div class="doctor-hero">
+                <div class="doctor-hero-copy">
+                    <span class="doctor-kicker">{{ t('doctor.kicker', default='System diagnostics') }}</span>
+                    <h2>{{ t('doctor.title', default='Doctor') }}</h2>
+                    <p id="doctorSummaryText">{{ t('doctor.summary.idle', default='Run a health check for settings, cache integrity, and UI consistency.') }}</p>
+                </div>
+                <div id="doctorSummaryBadge" class="doctor-summary-badge doctor-status-ok">
+                    <i class="fas fa-heartbeat"></i>
+                    <span>{{ t('doctor.status.ok', default='Healthy') }}</span>
+                </div>
+            </div>
+
+            <div id="doctorLoadingState" class="doctor-loading-state">
+                <i class="fas fa-spinner fa-spin"></i>
+                <span>{{ t('doctor.loading', default='Checking environment...') }}</span>
+            </div>
+
+            <div id="doctorIssuesList" class="doctor-issues-list"></div>
+
+            <div class="doctor-footer">
+                <div class="doctor-footer-note">{{ t('doctor.footer', default='Export a diagnostics bundle if the issues remain after repair.') }}</div>
+                <div class="doctor-footer-actions">
+                    <button id="doctorRefreshBtn" class="secondary-btn">
+                        <i class="fas fa-sync-alt"></i>
+                        <span>{{ t('doctor.actions.runAgain', default='Run Again') }}</span>
+                    </button>
+                    <button id="doctorExportBtn" class="primary-btn">
+                        <i class="fas fa-file-export"></i>
+                        <span>{{ t('doctor.actions.exportBundle', default='Export Bundle') }}</span>
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>

templates/recipes.html

@@ -120,6 +120,13 @@
         </div>
 
         <div class="controls-right">
+            <div class="control-group doctor-control-group">
+                <button id="doctorTriggerBtn" class="doctor-trigger" title="{{ t('doctor.buttonTitle', default='Run diagnostics and common fixes') }}">
+                    <i class="fas fa-stethoscope"></i>
+                    <span>{{ t('doctor.title', default='Doctor') }}</span>
+                    <span id="doctorStatusBadge" class="doctor-status-badge hidden" aria-hidden="true"></span>
+                </button>
+            </div>
             <div class="keyboard-nav-hint tooltip">
                 <i class="fas fa-keyboard"></i>
                 <span class="tooltiptext">

tests/frontend/core/appCore.test.js

@@ -50,6 +50,12 @@ vi.mock('../../../static/js/managers/HelpManager.js', () => ({
   },
 }));
 
+vi.mock('../../../static/js/managers/DoctorManager.js', () => ({
+  doctorManager: {
+    initialize: vi.fn(),
+  },
+}));
+
 vi.mock('../../../static/js/managers/BannerService.js', () => ({
   bannerService: {
     initialize: vi.fn(),
@@ -103,6 +109,7 @@ import { moveManager } from '../../../static/js/managers/MoveManager.js';
 import { bulkManager } from '../../../static/js/managers/BulkManager.js';
 import { ExampleImagesManager } from '../../../static/js/managers/ExampleImagesManager.js';
 import { helpManager } from '../../../static/js/managers/HelpManager.js';
+import { doctorManager } from '../../../static/js/managers/DoctorManager.js';
 import { bannerService } from '../../../static/js/managers/BannerService.js';
 import { initTheme, initBackToTop } from '../../../static/js/utils/uiHelpers.js';
 import { onboardingManager } from '../../../static/js/managers/OnboardingManager.js';
@@ -187,6 +194,7 @@ describe('AppCore initialization flow', () => {
     delete window.helpManager;
     delete window.moveManager;
     delete window.bulkManager;
+    delete window.doctorManager;
     delete window.headerManager;
     delete window.i18n;
     delete window.pageContextMenu;
@@ -214,6 +222,7 @@ describe('AppCore initialization flow', () => {
     expect(bannerService.initialize).toHaveBeenCalledTimes(1);
     expect(window.modalManager).toBe(modalManager);
     expect(window.settingsManager).toBe(settingsManager);
+    expect(window.doctorManager).toBe(doctorManager);
     expect(window.moveManager).toBe(moveManager);
     expect(window.bulkManager).toBe(bulkManager);
     expect(HeaderManager).toHaveBeenCalledTimes(1);
@@ -227,6 +236,7 @@ describe('AppCore initialization flow', () => {
     expect(window.exampleImagesManager).toBe(exampleImagesManagerInstance);
     expect(exampleImagesManagerInitialize).toHaveBeenCalledTimes(1);
     expect(helpManager.initialize).toHaveBeenCalledTimes(1);
+    expect(doctorManager.initialize).toHaveBeenCalledTimes(1);
     expect(document.body.classList.contains('hover-reveal')).toBe(true);
     expect(initializeEventManagement).toHaveBeenCalledTimes(1);
     expect(onboardingManager.start).not.toHaveBeenCalled();

tests/frontend/managers/DoctorManager.test.js

@@ -0,0 +1,56 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { mountMarkup, resetDom } from '../utils/domFixtures.js';
+
+vi.mock('../../../static/js/managers/ModalManager.js', () => ({
+  modalManager: {
+    showModal: vi.fn(),
+  },
+}));
+
+vi.mock('../../../static/js/utils/uiHelpers.js', () => ({
+  showToast: vi.fn(),
+}));
+
+vi.mock('../../../static/js/utils/i18nHelpers.js', () => ({
+  translate: vi.fn((key, _params, fallback) => fallback || key),
+}));
+
+vi.mock('../../../static/js/components/shared/utils.js', () => ({
+  escapeHtml: vi.fn((value) => String(value)),
+}));
+
+import { DoctorManager } from '../../../static/js/managers/DoctorManager.js';
+
+function renderDoctorFixture() {
+  mountMarkup(`
+    <button id="doctorTriggerBtn"></button>
+    <span id="doctorStatusBadge" class="hidden"></span>
+    <div id="doctorModal"></div>
+    <div id="doctorIssuesList"></div>
+    <div id="doctorSummaryText"></div>
+    <div id="doctorSummaryBadge"></div>
+    <div id="doctorLoadingState"></div>
+    <button id="doctorRefreshBtn"></button>
+    <button id="doctorExportBtn"></button>
+  `);
+  document.body.dataset.appVersion = '1.2.3-test';
+}
+
+describe('DoctorManager', () => {
+  beforeEach(() => {
+    resetDom();
+    vi.clearAllMocks();
+    delete window.__lmDoctorConsolePatched;
+    delete window.__lmDoctorConsoleEntries;
+  });
+
+  it('does not run diagnostics during initialize', () => {
+    renderDoctorFixture();
+    const manager = new DoctorManager();
+    const refreshSpy = vi.spyOn(manager, 'refreshDiagnostics').mockResolvedValue(undefined);
+
+    manager.initialize();
+
+    expect(refreshSpy).not.toHaveBeenCalled();
+  });
+});

tests/routes/test_misc_routes.py

@@ -1,6 +1,9 @@
+import io
 import json
+import logging
 import os
 import subprocess
+import zipfile
 from types import SimpleNamespace
 from unittest.mock import patch, MagicMock
 
@@ -9,6 +12,7 @@ from aiohttp import web
 
 from py.routes.handlers.misc_handlers import (
     BackupHandler,
+    DoctorHandler,
     FileSystemHandler,
     LoraCodeHandler,
     ModelLibraryHandler,
@@ -16,10 +20,15 @@ from py.routes.handlers.misc_handlers import (
     NodeRegistryHandler,
     ServiceRegistryAdapter,
     SettingsHandler,
+    _collect_comfyui_session_logs,
     _is_wsl,
     _wsl_to_windows_path,
     _is_docker,
 )
+from py.utils.session_logging import (
+    reset_standalone_session_logging_for_tests,
+    setup_standalone_session_logging,
+)
 from py.routes.misc_route_registrar import MISC_ROUTE_DEFINITIONS, MiscRouteRegistrar
 from py.routes.misc_routes import MiscRoutes
 
@@ -37,6 +46,7 @@ class FakeRequest:
 class DummySettings:
     def __init__(self, data=None):
         self.data = data or {}
+        self.settings = self.data
 
     def get(self, key, default=None):
         return self.data.get(key, default)
@@ -67,6 +77,31 @@ async def dummy_downloader_factory():
     return DummyDownloader()
 
 
+class DummyDoctorScanner:
+    def __init__(self, *, model_type='lora', raw_data=None, rebuild_error=None):
+        self.model_type = model_type
+        self._raw_data = list(raw_data or [])
+        self._rebuild_error = rebuild_error
+        self._persistent_cache = SimpleNamespace(
+            load_cache=lambda _model_type: SimpleNamespace(raw_data=list(self._raw_data))
+        )
+
+    async def get_cached_data(self, force_refresh=False, rebuild_cache=False):
+        if rebuild_cache and self._rebuild_error:
+            raise self._rebuild_error
+        return SimpleNamespace(raw_data=list(self._raw_data))
+
+
+class DummyCivitaiClient:
+    def __init__(self, *, success=True, result=None):
+        self.base_url = 'https://civitai.com/api/v1'
+        self._success = success
+        self._result = result if result is not None else {'items': []}
+
+    async def _make_request(self, *_args, **_kwargs):
+        return self._success, self._result
+
+
 @pytest.mark.asyncio
 async def test_get_settings_excludes_no_sync_keys():
     """Verify that settings in _NO_SYNC_KEYS are not synced, but others are."""
@@ -113,6 +148,257 @@ async def test_update_settings_rejects_missing_example_path(tmp_path):
     assert "Path does not exist" in payload["error"]
 
 
+@pytest.mark.asyncio
+async def test_doctor_handler_reports_key_cache_and_ui_issues():
+    settings_service = DummySettings({"civitai_api_key": ""})
+    invalid_entry = {"file_path": "/tmp/missing.safetensors"}
+
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    async def scanner_factory():
+        return DummyDoctorScanner(model_type="lora", raw_data=[invalid_entry])
+
+    handler = DoctorHandler(
+        settings_service=settings_service,
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(("lora", "LoRAs", scanner_factory),),
+        app_version_getter=lambda: "1.2.3-server",
+    )
+
+    response = await handler.get_doctor_diagnostics(
+        FakeRequest(query={"clientVersion": "1.2.2-client"}, method="GET")
+    )
+    payload = json.loads(response.text)
+
+    assert payload["success"] is True
+    assert payload["summary"]["status"] == "error"
+    diagnostic_map = {item["id"]: item for item in payload["diagnostics"]}
+    assert diagnostic_map["civitai_api_key"]["status"] == "warning"
+    assert diagnostic_map["cache_health"]["status"] == "error"
+    assert diagnostic_map["ui_version"]["status"] == "warning"
+
+
+@pytest.mark.asyncio
+async def test_doctor_handler_can_repair_cache():
+    scanner = DummyDoctorScanner(model_type="lora", raw_data=[])
+
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    async def scanner_factory():
+        return scanner
+
+    handler = DoctorHandler(
+        settings_service=DummySettings({"civitai_api_key": "token"}),
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(("lora", "LoRAs", scanner_factory),),
+    )
+
+    response = await handler.repair_doctor_cache(FakeRequest())
+    payload = json.loads(response.text)
+
+    assert response.status == 200
+    assert payload["success"] is True
+    assert payload["repaired"] == [{"model_type": "lora", "label": "LoRAs"}]
+
+
+@pytest.mark.asyncio
+async def test_doctor_handler_exports_support_bundle():
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    handler = DoctorHandler(
+        settings_service=DummySettings({"civitai_api_key": "secret-key"}),
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(),
+        app_version_getter=lambda: "9.9.9-test",
+    )
+
+    response = await handler.export_doctor_bundle(
+        FakeRequest(
+            json_data={
+                "summary": {"status": "warning"},
+                "diagnostics": [{"id": "cache_health", "status": "warning"}],
+                "frontend_logs": [{"level": "error", "message": "boom"}],
+                "client_context": {"app_version": "9.9.8-old"},
+            }
+        )
+    )
+
+    assert response.status == 200
+    with zipfile.ZipFile(io.BytesIO(response.body), "r") as archive:
+        names = set(archive.namelist())
+        assert "doctor-report.json" in names
+        assert "settings-sanitized.json" in names
+        assert "backend-log-source.json" in names
+        settings_payload = json.loads(archive.read("settings-sanitized.json").decode("utf-8"))
+        assert settings_payload["civitai_api_key"].startswith("secr")
+
+
+@pytest.mark.asyncio
+async def test_doctor_handler_redacts_string_secrets_in_bundle():
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    handler = DoctorHandler(
+        settings_service=DummySettings({"civitai_api_key": "secret-key"}),
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(),
+        app_version_getter=lambda: "9.9.9-test",
+    )
+
+    response = await handler.export_doctor_bundle(
+        FakeRequest(
+            json_data={
+                "frontend_logs": [
+                    {
+                        "level": "error",
+                        "message": "Authorization: Bearer abcdef123456 token=xyz password=hunter2",
+                    }
+                ],
+            }
+        )
+    )
+
+    assert response.status == 200
+    with zipfile.ZipFile(io.BytesIO(response.body), "r") as archive:
+        frontend_logs = archive.read("frontend-console.json").decode("utf-8")
+        assert "abcdef123456" not in frontend_logs
+        assert "hunter2" not in frontend_logs
+        assert "Bearer ***" in frontend_logs
+        backend_logs = archive.read("backend-logs.txt").decode("utf-8")
+        assert "hunter2" not in backend_logs
+
+
+@pytest.mark.asyncio
+async def test_doctor_handler_redacts_json_shaped_string_secrets_in_bundle():
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    handler = DoctorHandler(
+        settings_service=DummySettings({"civitai_api_key": "secret-key"}),
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(),
+        app_version_getter=lambda: "9.9.9-test",
+    )
+    handler._collect_backend_session_logs = lambda: {
+        "mode": "standalone",
+        "source_method": "standalone_memory",
+        "session_started_at": "2026-04-11T10:00:00+00:00",
+        "session_id": "session-123",
+        "persistent_log_path": None,
+        "persistent_log_text": "",
+        "session_log_text": '{"token":"abcd1234","authorization":"Bearer qwerty","password":"hunter2"}\n',
+        "notes": [],
+    }
+
+    response = await handler.export_doctor_bundle(
+        FakeRequest(
+            json_data={
+                "frontend_logs": [
+                    {
+                        "level": "error",
+                        "message": '{"token":"abcd1234","authorization":"Bearer qwerty","password":"hunter2"}',
+                    }
+                ],
+            }
+        )
+    )
+
+    assert response.status == 200
+    with zipfile.ZipFile(io.BytesIO(response.body), "r") as archive:
+        frontend_logs = archive.read("frontend-console.json").decode("utf-8")
+        backend_logs = archive.read("backend-logs.txt").decode("utf-8")
+
+        assert '"token":"abcd1234"' not in frontend_logs
+        assert '"password":"hunter2"' not in frontend_logs
+        assert 'Bearer qwerty' not in frontend_logs
+        assert '\\"token\\":\\"***\\"' in frontend_logs
+        assert '\\"password\\":\\"***\\"' in frontend_logs
+        assert 'Bearer ***' in frontend_logs
+
+        assert '"token":"abcd1234"' not in backend_logs
+        assert '"password":"hunter2"' not in backend_logs
+        assert 'Bearer qwerty' not in backend_logs
+
+
+@pytest.mark.asyncio
+async def test_doctor_handler_exports_backend_session_logs_from_helper():
+    async def civitai_factory():
+        return DummyCivitaiClient()
+
+    handler = DoctorHandler(
+        settings_service=DummySettings({"civitai_api_key": "secret-key"}),
+        civitai_client_factory=civitai_factory,
+        scanner_factories=(),
+        app_version_getter=lambda: "9.9.9-test",
+    )
+    handler._collect_backend_session_logs = lambda: {
+        "mode": "standalone",
+        "source_method": "standalone_session_file",
+        "session_started_at": "2026-04-11T10:00:00+00:00",
+        "session_id": "session-123",
+        "persistent_log_path": "/tmp/standalone.log",
+        "persistent_log_text": "token=abcd1234\n",
+        "session_log_text": "Authorization: Bearer supersecret\n",
+        "notes": [],
+    }
+
+    response = await handler.export_doctor_bundle(FakeRequest(json_data={}))
+
+    assert response.status == 200
+    with zipfile.ZipFile(io.BytesIO(response.body), "r") as archive:
+        backend_logs = archive.read("backend-logs.txt").decode("utf-8")
+        backend_source = json.loads(
+            archive.read("backend-log-source.json").decode("utf-8")
+        )
+
+        assert "supersecret" not in backend_logs
+        assert backend_source["source_method"] == "standalone_session_file"
+        assert backend_source["session_id"] == "session-123"
+
+
+def test_collect_comfyui_session_logs_only_uses_matching_current_session_file(tmp_path):
+    log_file = tmp_path / "comfyui.log"
+    log_file.write_text(
+        "** ComfyUI startup time: 2026-04-11 12:00:00.000\n"
+        "[2026-04-11 12:00:01.000] file log line\n",
+        encoding="utf-8",
+    )
+
+    result = _collect_comfyui_session_logs(
+        log_entries=[
+            {
+                "t": "2026-04-11 12:05:00.000",
+                "m": "** ComfyUI startup time: 2026-04-11 12:05:00.000\n",
+            },
+            {"t": "2026-04-11 12:05:01.000", "m": "current session line\n"},
+        ],
+        log_file_path=str(log_file),
+    )
+
+    assert result["persistent_log_text"] == ""
+    assert any("does not match" in note for note in result["notes"])
+
+
+def test_setup_standalone_session_logging_creates_current_session_file(tmp_path):
+    reset_standalone_session_logging_for_tests()
+    settings_file = tmp_path / "settings.json"
+    settings_file.write_text("{}", encoding="utf-8")
+
+    state = setup_standalone_session_logging(str(settings_file))
+    logger = logging.getLogger("lora-manager-standalone-test")
+    logger.info("standalone current session line")
+
+    assert state.log_file_path is not None
+    assert os.path.isfile(state.log_file_path)
+    with open(state.log_file_path, "r", encoding="utf-8") as handle:
+        payload = handle.read()
+
+    assert "LoRA Manager standalone startup time:" in payload
+
+
 class DummyBackupService:
     def __init__(self):
         self.restore_calls = []