feat: improve timeline/admin flows and ingest projection repairs

internal/api/timeline.go

@@ -47,6 +47,57 @@ func writeTimelineResponse(w http.ResponseWriter, r *http.Request, repo *timelin
 	})
 }
 
+func writeImportHistoryResponse(w http.ResponseWriter, r *http.Request, repo *timeline.EventRepository, subjectType string, subjectID string) {
+	limit := 20
+	if raw := r.URL.Query().Get("limit"); raw != "" {
+		if parsed, err := strconv.Atoi(raw); err == nil {
+			limit = parsed
+		} else {
+			writeError(w, http.StatusBadRequest, "invalid limit")
+			return
+		}
+	}
+
+	var cursor *timeline.Cursor
+	if raw := r.URL.Query().Get("cursor"); raw != "" {
+		decoded, err := timeline.DecodeCursor(raw)
+		if err != nil {
+			writeError(w, http.StatusBadRequest, "invalid cursor")
+			return
+		}
+		cursor = &decoded
+	}
+
+	var (
+		items []timeline.ImportHistoryItem
+		next  *timeline.Cursor
+		err   error
+	)
+	switch subjectType {
+	case "asset":
+		items, next, err = repo.ListAssetImportHistory(r.Context(), subjectID, limit, cursor)
+	case "component":
+		items, next, err = repo.ListComponentImportHistory(r.Context(), subjectID, limit, cursor)
+	default:
+		writeError(w, http.StatusBadRequest, "unsupported subject type")
+		return
+	}
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "list import history failed")
+		return
+	}
+
+	var nextCursor *string
+	if next != nil {
+		value := timeline.EncodeCursor(*next)
+		nextCursor = &value
+	}
+	writeJSON(w, http.StatusOK, map[string]any{
+		"items":       items,
+		"next_cursor": nextCursor,
+	})
+}
+
 func parseTimelineID(path, prefix string) string {
 	if !strings.HasPrefix(path, prefix) || !strings.HasSuffix(path, "/timeline") {
 		return ""