diff --git a/cmd/server/main.go b/cmd/server/main.go
index 7f8d5ed..2894950 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -130,6 +130,13 @@ type messageOut struct {
 	FetchedAt          time.Time        `json:"fetched_at"`
 }
 
+type componentProbe struct {
+	Name      string `json:"name"`
+	Status    string `json:"status"`
+	LatencyMs int64  `json:"latency_ms"`
+	Error     string `json:"error,omitempty"`
+}
+
 func main() {
 	cfg := loadConfig()
 	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
@@ -186,6 +193,10 @@ func (a *app) serveHTTP(w http.ResponseWriter, r *http.Request) {
 		writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
 		return
 	}
+	if path == "/health/detail" {
+		a.handleHealthDetail(w, r)
+		return
+	}
 	if path == "/" {
 		writeJSON(w, http.StatusOK, map[string]string{"service": "monitoring-tg", "ui": "portal", "api": "go"})
 		return
@@ -245,6 +256,156 @@ func (a *app) apiPath(path string) string {
 	return path
 }
 
+func (a *app) handleHealthDetail(w http.ResponseWriter, r *http.Request) {
+	ctx, cancel := context.WithTimeout(r.Context(), 3*time.Second)
+	defer cancel()
+
+	components := []componentProbe{
+		a.probePostgres(ctx),
+		a.probeAIService(ctx),
+		a.probeClassificationQueue(ctx),
+		a.probePoller(ctx),
+		a.probeMediaStorage(ctx),
+		a.probeMediaMetadata(ctx),
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"components": components})
+}
+
+func (a *app) probePostgres(ctx context.Context) componentProbe {
+	start := time.Now()
+	if err := a.db.Ping(ctx); err != nil {
+		return componentProbe{Name: "postgres", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	return componentProbe{Name: "postgres", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+}
+
+func (a *app) probeAIService(ctx context.Context) componentProbe {
+	start := time.Now()
+	if !a.cfg.LLMEnabled {
+		return componentProbe{Name: "ai_service", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: "llm disabled"}
+	}
+	status, err := a.ai.ProvidersStatus(ctx)
+	if err != nil {
+		return componentProbe{Name: "ai_service", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	for _, provider := range status.Providers {
+		if provider.Name != "llm" {
+			continue
+		}
+		if provider.Configured && provider.OK {
+			return componentProbe{Name: "ai_service", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+		}
+		errMsg := strings.TrimSpace(provider.Error)
+		if errMsg == "" {
+			errMsg = "llm provider is not ready"
+		}
+		return componentProbe{Name: "ai_service", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: errMsg}
+	}
+	return componentProbe{Name: "ai_service", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: "llm provider not found"}
+}
+
+func (a *app) probeClassificationQueue(ctx context.Context) componentProbe {
+	start := time.Now()
+	var pending, pending24h int64
+	err := a.db.QueryRow(ctx, `
+		SELECT
+			COUNT(*)::bigint,
+			COUNT(*) FILTER (WHERE m.fetched_at >= now() - interval '24 hours')::bigint
+		FROM channels c
+		JOIN channels src ON src.id = COALESCE(c.source_channel_id, c.id)
+		JOIN messages m ON m.channel_id = src.id
+		JOIN sections s ON s.id = c.section_id
+		LEFT JOIN message_classifications mc ON mc.message_id = m.id AND mc.section_id = s.id
+		WHERE m.text IS NOT NULL
+		  AND mc.id IS NULL`,
+	).Scan(&pending, &pending24h)
+	if err != nil {
+		return componentProbe{Name: "classification_queue", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	if pending > 0 {
+		return componentProbe{
+			Name:      "classification_queue",
+			Status:    "down",
+			LatencyMs: time.Since(start).Milliseconds(),
+			Error:     "pending=" + strconv.FormatInt(pending, 10) + " pending_24h=" + strconv.FormatInt(pending24h, 10),
+		}
+	}
+	return componentProbe{Name: "classification_queue", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+}
+
+func (a *app) probePoller(ctx context.Context) componentProbe {
+	start := time.Now()
+	staleAfter := maxInt(a.cfg.PollIntervalSeconds*3, 900)
+	var active, neverPolled, stale int64
+	err := a.db.QueryRow(ctx, `
+		SELECT
+			COUNT(*)::bigint,
+			COUNT(*) FILTER (WHERE last_polled_at IS NULL)::bigint,
+			COUNT(*) FILTER (WHERE last_polled_at IS NOT NULL AND last_polled_at < now() - ($1::int * interval '1 second'))::bigint
+		FROM channels
+		WHERE is_active = true
+		  AND source_channel_id IS NULL`,
+		staleAfter,
+	).Scan(&active, &neverPolled, &stale)
+	if err != nil {
+		return componentProbe{Name: "poller", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	if active > 0 && (neverPolled > 0 || stale > 0) {
+		return componentProbe{
+			Name:      "poller",
+			Status:    "down",
+			LatencyMs: time.Since(start).Milliseconds(),
+			Error: "active=" + strconv.FormatInt(active, 10) +
+				" never_polled=" + strconv.FormatInt(neverPolled, 10) +
+				" stale=" + strconv.FormatInt(stale, 10) +
+				" stale_after_sec=" + strconv.Itoa(staleAfter),
+		}
+	}
+	return componentProbe{Name: "poller", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+}
+
+func (a *app) probeMediaStorage(ctx context.Context) componentProbe {
+	start := time.Now()
+	if a.minio == nil || a.cfg.MinioBucket == "" {
+		return componentProbe{Name: "media_storage", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: "minio not configured"}
+	}
+	exists, err := a.minio.BucketExists(ctx, a.cfg.MinioBucket)
+	if err != nil {
+		return componentProbe{Name: "media_storage", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	if !exists {
+		return componentProbe{Name: "media_storage", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: "bucket not found: " + a.cfg.MinioBucket}
+	}
+	return componentProbe{Name: "media_storage", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+}
+
+func (a *app) probeMediaMetadata(ctx context.Context) componentProbe {
+	start := time.Now()
+	var withMedia, missingFiles int64
+	err := a.db.QueryRow(ctx, `
+		SELECT
+			COUNT(*) FILTER (WHERE has_media = true)::bigint,
+			COUNT(*) FILTER (
+				WHERE has_media = true
+				  AND jsonb_array_length(COALESCE(media_files, '[]'::jsonb)) = 0
+			)::bigint
+		FROM messages`,
+	).Scan(&withMedia, &missingFiles)
+	if err != nil {
+		return componentProbe{Name: "media_metadata", Status: "down", LatencyMs: time.Since(start).Milliseconds(), Error: err.Error()}
+	}
+	if missingFiles > 0 {
+		return componentProbe{
+			Name:      "media_metadata",
+			Status:    "down",
+			LatencyMs: time.Since(start).Milliseconds(),
+			Error: "messages_with_media=" + strconv.FormatInt(withMedia, 10) +
+				" missing_media_files=" + strconv.FormatInt(missingFiles, 10),
+		}
+	}
+	return componentProbe{Name: "media_metadata", Status: "ok", LatencyMs: time.Since(start).Milliseconds()}
+}
+
 func (a *app) handleAccessMe(w http.ResponseWriter, r *http.Request) {
 	scope := readAccess(r)
 	writeJSON(w, http.StatusOK, map[string]any{