优化后台高频查询性能

backend/internal/modules/chat/admin_counts_cache.go

@@ -0,0 +1,43 @@
+package chat
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+const adminChatCountsCacheTTL = 5 * time.Second
+
+func (r *Repository) adminChatCountsCacheKey(principal Principal, filter, stage, keyword string) string {
+	sum := sha256.Sum256([]byte(keyword))
+	return fmt.Sprintf("admin-chat:counts:v2:%s:%d:%s:%s:%s", principal.Type, principal.ID, filter, stage, hex.EncodeToString(sum[:8]))
+}
+
+func (r *Repository) loadAdminChatCountsCache(ctx context.Context, principal Principal, filter, stage, keyword string) *AdminConversationCountsDTO {
+	if r.redis == nil {
+		return nil
+	}
+	raw, err := r.redis.Get(ctx, r.adminChatCountsCacheKey(principal, filter, stage, keyword)).Bytes()
+	if err != nil {
+		return nil
+	}
+	var value AdminConversationCountsDTO
+	if err := json.Unmarshal(raw, &value); err != nil {
+		return nil
+	}
+	return &value
+}
+
+func (r *Repository) storeAdminChatCountsCache(ctx context.Context, principal Principal, filter, stage, keyword string, value *AdminConversationCountsDTO) {
+	if r.redis == nil || value == nil {
+		return
+	}
+	raw, err := json.Marshal(value)
+	if err != nil {
+		return
+	}
+	_ = r.redis.Set(ctx, r.adminChatCountsCacheKey(principal, filter, stage, keyword), raw, adminChatCountsCacheTTL).Err()
+}