perf: optimize data path, indexes and frontend virtualization

- Убран latestCDNRowsBySource; expanded BIRD preview генерируется on-demand
- Batch AS meta updates; миграция perf-индексов 000012
- VirtualPrefixList для preview префиксов; метрики pipeline refresh
- PolitePause для RIPEstat после cache miss

Co-authored-by: Cursor <[email protected]>

internal/pipeline/collect_parallel.go

@@ -97,15 +97,18 @@ func collectASPrefixRows(ctx context.Context, st store.Backend, hc *http.Client,
 
 	seenPfx := make(map[string]struct{})
 	var out []store.PrefixRow
+	var metaUpdates []store.ASEntryResolveMetaUpdate
 	now := time.Now().UTC()
 	for _, r := range results {
 		if r.err != nil {
 			return nil, r.err
 		}
 		if r.metaID != "" {
-			if err := st.UpdateASEntryResolveMeta(tenantID, moduleID, r.metaID, r.holder, r.count, now); err != nil {
-				return nil, fmt.Errorf("as entry meta AS%d: %w", r.asn, err)
-			}
+			metaUpdates = append(metaUpdates, store.ASEntryResolveMetaUpdate{
+				EntryID:     r.metaID,
+				ASNName:     r.holder,
+				PrefixCount: r.count,
+			})
 		}
 		for _, row := range r.rows {
 			k := row.Prefix
@@ -116,6 +119,11 @@ func collectASPrefixRows(ctx context.Context, st store.Backend, hc *http.Client,
 			out = append(out, row)
 		}
 	}
+	if len(metaUpdates) > 0 {
+		if err := st.UpdateASEntryResolveMetaBatch(tenantID, moduleID, metaUpdates, now); err != nil {
+			return nil, fmt.Errorf("as entry meta batch: %w", err)
+		}
+	}
 	return out, nil
 }
 
@@ -150,9 +158,11 @@ func collectCDNPrefixRows(ctx context.Context, st store.Backend, hc *http.Client
 					results[idx] = srcResult{rows: cached}
 					return
 				}
-				if cached := latestCDNRowsBySource(st, tenantID)[sourceKey]; len(cached) > 0 {
-					results[idx] = srcResult{rows: cached}
-					return
+				if snap, ok, _ := st.GetModulePrefixSnapshot(tenantID, moduleID); ok && snap != nil {
+					if cached := prefixRowsForSource(snap.Prefixes, sourceKey); len(cached) > 0 {
+						results[idx] = srcResult{rows: cached}
+						return
+					}
 				}
 			}
 			rows, err := fetchCDNSourceRows(ctx, st, hc, tenantID, moduleID, mod, src, priorSnapshot, now)