Go: fix forgetting policy validation and fix memory update diff checks (#14976)

### What problem does this PR solve?

 fix forgetting policy validation and fix memory update diff checks

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

internal/service/memory.go

@@ -499,7 +499,7 @@ func (s *MemoryService) UpdateMemory(tenantID string, memoryID string, req *Upda
 	}
 
 	if req.ForgettingPolicy != nil {
-		fp := ForgettingPolicy(strings.ToLower(*req.ForgettingPolicy))
+		fp := ForgettingPolicy(strings.ToUpper(strings.TrimSpace(*req.ForgettingPolicy)))
 		if !validForgettingPolicies[fp] {
 			return nil, fmt.Errorf("forgetting policy '%s' is not supported", *req.ForgettingPolicy)
 		}
@@ -544,6 +544,108 @@ func (s *MemoryService) UpdateMemory(tenantID string, memoryID string, req *Upda
 		return formatRetDataFromMemory(currentMemory), nil
 	}
 
+	currentMemoryTypes := dao.GetMemoryTypeHuman(currentMemory.MemoryType)
+	normalizedCurrentMemoryTypes := normalizeMemoryTypes(currentMemoryTypes)
+
+	filteredUpdateDict := make(map[string]interface{}, len(updateDict))
+	for field, value := range updateDict {
+		switch field {
+		case "name":
+			currentName := strings.TrimSpace(currentMemory.Name)
+			requestName := strings.TrimSpace(fmt.Sprint(value))
+			if currentName != requestName {
+				filteredUpdateDict[field] = value
+			}
+		case "permissions":
+			currentPermissions := strings.ToLower(strings.TrimSpace(currentMemory.Permissions))
+			requestPermissions := strings.ToLower(strings.TrimSpace(fmt.Sprint(value)))
+			if currentPermissions != requestPermissions {
+				filteredUpdateDict[field] = value
+			}
+		case "llm_id":
+			currentLLMID := strings.TrimSpace(currentMemory.LLMID)
+			requestLLMID := strings.TrimSpace(fmt.Sprint(value))
+			if currentLLMID != requestLLMID {
+				filteredUpdateDict[field] = value
+			}
+		case "embd_id":
+			currentEmbdID := strings.TrimSpace(currentMemory.EmbdID)
+			requestEmbdID := strings.TrimSpace(fmt.Sprint(value))
+			if currentEmbdID != requestEmbdID {
+				filteredUpdateDict[field] = value
+			}
+		case "tenant_llm_id":
+			if currentMemory.TenantLLMID == nil || *currentMemory.TenantLLMID != value.(int64) {
+				filteredUpdateDict[field] = value
+			}
+		case "tenant_embd_id":
+			if currentMemory.TenantEmbdID == nil || *currentMemory.TenantEmbdID != value.(int64) {
+				filteredUpdateDict[field] = value
+			}
+		case "memory_type":
+			if types, ok := value.([]string); ok {
+				if !sameStringSet(normalizedCurrentMemoryTypes, normalizeMemoryTypes(types)) {
+					filteredUpdateDict[field] = value
+				}
+			} else {
+				filteredUpdateDict[field] = value
+			}
+		case "memory_size":
+			if currentMemory.MemorySize != value.(int64) {
+				filteredUpdateDict[field] = value
+			}
+		case "forgetting_policy":
+			currentForgettingPolicy := strings.ToUpper(strings.TrimSpace(currentMemory.ForgettingPolicy))
+			requestForgettingPolicy := strings.ToUpper(strings.TrimSpace(fmt.Sprint(value)))
+			if currentForgettingPolicy != requestForgettingPolicy {
+				filteredUpdateDict[field] = value
+			}
+		case "temperature":
+			if currentMemory.Temperature != value.(float64) {
+				filteredUpdateDict[field] = value
+			}
+		case "avatar":
+			currentAvatar := ""
+			if currentMemory.Avatar != nil {
+				currentAvatar = *currentMemory.Avatar
+			}
+			if currentAvatar != fmt.Sprint(value) {
+				filteredUpdateDict[field] = value
+			}
+		case "description":
+			currentDescription := ""
+			if currentMemory.Description != nil {
+				currentDescription = *currentMemory.Description
+			}
+			if currentDescription != fmt.Sprint(value) {
+				filteredUpdateDict[field] = value
+			}
+		case "system_prompt":
+			currentSystemPrompt := ""
+			if currentMemory.SystemPrompt != nil {
+				currentSystemPrompt = *currentMemory.SystemPrompt
+			}
+			if currentSystemPrompt != fmt.Sprint(value) {
+				filteredUpdateDict[field] = value
+			}
+		case "user_prompt":
+			currentUserPrompt := ""
+			if currentMemory.UserPrompt != nil {
+				currentUserPrompt = *currentMemory.UserPrompt
+			}
+			if currentUserPrompt != fmt.Sprint(value) {
+				filteredUpdateDict[field] = value
+			}
+		default:
+			filteredUpdateDict[field] = value
+		}
+	}
+	updateDict = filteredUpdateDict
+
+	if len(updateDict) == 0 {
+		return formatRetDataFromMemory(currentMemory), nil
+	}
+
 	memorySize := currentMemory.MemorySize
 	notAllowedUpdate := []string{}
 	for _, f := range []string{"tenant_embd_id", "embd_id", "memory_type"} {
@@ -581,6 +683,45 @@ func (s *MemoryService) UpdateMemory(tenantID string, memoryID string, req *Upda
 	return formatRetDataFromMemory(updatedMemory), nil
 }
 
+func normalizeMemoryTypes(memoryTypes []string) []string {
+	normalized := make([]string, 0, len(memoryTypes))
+	seen := make(map[string]struct{}, len(memoryTypes))
+	for _, mt := range memoryTypes {
+		mt = strings.ToLower(strings.TrimSpace(mt))
+		if mt == "" {
+			continue
+		}
+		if _, exists := seen[mt]; exists {
+			continue
+		}
+		seen[mt] = struct{}{}
+		normalized = append(normalized, mt)
+	}
+	return normalized
+}
+
+func sameStringSet(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	counts := make(map[string]int, len(a))
+	for _, item := range a {
+		counts[item]++
+	}
+	for _, item := range b {
+		counts[item]--
+		if counts[item] < 0 {
+			return false
+		}
+	}
+	for _, count := range counts {
+		if count != 0 {
+			return false
+		}
+	}
+	return true
+}
+
 // DeleteMemory deletes a memory by ID
 // It also deletes associated message indexes before removing the memory record
 //