diff --git a/vendor/github.com/opencord/voltha-lib-go/v2/pkg/db/model/proxy.go b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/db/model/proxy.go
new file mode 100644
index 0000000..b5378fe
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/db/model/proxy.go
@@ -0,0 +1,598 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package model
+
+import (
+	"context"
+	"crypto/md5"
+	"errors"
+	"fmt"
+	"github.com/google/uuid"
+	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	"reflect"
+	"runtime"
+	"strings"
+	"sync"
+)
+
+// OperationContext holds details on the information used during an operation
+type OperationContext struct {
+	Path      string
+	Data      interface{}
+	FieldName string
+	ChildKey  string
+}
+
+// NewOperationContext instantiates a new OperationContext structure
+func NewOperationContext(path string, data interface{}, fieldName string, childKey string) *OperationContext {
+	oc := &OperationContext{
+		Path:      path,
+		Data:      data,
+		FieldName: fieldName,
+		ChildKey:  childKey,
+	}
+	return oc
+}
+
+// Update applies new data to the context structure
+func (oc *OperationContext) Update(data interface{}) *OperationContext {
+	oc.Data = data
+	return oc
+}
+
+// Proxy holds the information for a specific location with the data model
+type Proxy struct {
+	mutex      sync.RWMutex
+	Root       *root
+	Node       *node
+	ParentNode *node
+	Path       string
+	FullPath   string
+	Exclusive  bool
+	Callbacks  map[CallbackType]map[string]*CallbackTuple
+	operation  ProxyOperation
+}
+
+// NewProxy instantiates a new proxy to a specific location
+func NewProxy(root *root, node *node, parentNode *node, path string, fullPath string, exclusive bool) *Proxy {
+	callbacks := make(map[CallbackType]map[string]*CallbackTuple)
+	if fullPath == "/" {
+		fullPath = ""
+	}
+	p := &Proxy{
+		Root:       root,
+		Node:       node,
+		ParentNode: parentNode,
+		Exclusive:  exclusive,
+		Path:       path,
+		FullPath:   fullPath,
+		Callbacks:  callbacks,
+	}
+	return p
+}
+
+// GetRoot returns the root attribute of the proxy
+func (p *Proxy) GetRoot() *root {
+	return p.Root
+}
+
+// getPath returns the path attribute of the proxy
+func (p *Proxy) getPath() string {
+	return p.Path
+}
+
+// getFullPath returns the full path attribute of the proxy
+func (p *Proxy) getFullPath() string {
+	return p.FullPath
+}
+
+// getCallbacks returns the full list of callbacks associated to the proxy
+func (p *Proxy) getCallbacks(callbackType CallbackType) map[string]*CallbackTuple {
+	p.mutex.RLock()
+	defer p.mutex.RUnlock()
+
+	if p != nil {
+		if cb, exists := p.Callbacks[callbackType]; exists {
+			return cb
+		}
+	} else {
+		log.Debugw("proxy-is-nil", log.Fields{"callback-type": callbackType.String()})
+	}
+	return nil
+}
+
+// getCallback returns a specific callback matching the type and function hash
+func (p *Proxy) getCallback(callbackType CallbackType, funcHash string) *CallbackTuple {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+	if tuple, exists := p.Callbacks[callbackType][funcHash]; exists {
+		return tuple
+	}
+	return nil
+}
+
+// setCallbacks applies a callbacks list to a type
+func (p *Proxy) setCallbacks(callbackType CallbackType, callbacks map[string]*CallbackTuple) {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+	p.Callbacks[callbackType] = callbacks
+}
+
+// setCallback applies a callback to a type and hash value
+func (p *Proxy) setCallback(callbackType CallbackType, funcHash string, tuple *CallbackTuple) {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+	p.Callbacks[callbackType][funcHash] = tuple
+}
+
+// DeleteCallback removes a callback matching the type and hash
+func (p *Proxy) DeleteCallback(callbackType CallbackType, funcHash string) {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+	delete(p.Callbacks[callbackType], funcHash)
+}
+
+// CallbackType is an enumerated value to express when a callback should be executed
+type ProxyOperation uint8
+
+// Enumerated list of callback types
+const (
+	PROXY_NONE ProxyOperation = iota
+	PROXY_GET
+	PROXY_LIST
+	PROXY_ADD
+	PROXY_UPDATE
+	PROXY_REMOVE
+	PROXY_CREATE
+	PROXY_WATCH
+)
+
+var proxyOperationTypes = []string{
+	"PROXY_NONE",
+	"PROXY_GET",
+	"PROXY_LIST",
+	"PROXY_ADD",
+	"PROXY_UPDATE",
+	"PROXY_REMOVE",
+	"PROXY_CREATE",
+	"PROXY_WATCH",
+}
+
+func (t ProxyOperation) String() string {
+	return proxyOperationTypes[t]
+}
+
+func (p *Proxy) GetOperation() ProxyOperation {
+	p.mutex.RLock()
+	defer p.mutex.RUnlock()
+	return p.operation
+}
+
+func (p *Proxy) SetOperation(operation ProxyOperation) {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+	p.operation = operation
+}
+
+// parseForControlledPath verifies if a proxy path matches a pattern
+// for locations that need to be access controlled.
+func (p *Proxy) parseForControlledPath(path string) (pathLock string, controlled bool) {
+	// TODO: Add other path prefixes that may need control
+	if strings.HasPrefix(path, "/devices") ||
+		strings.HasPrefix(path, "/logical_devices") ||
+		strings.HasPrefix(path, "/adapters") {
+
+		split := strings.SplitN(path, "/", -1)
+		switch len(split) {
+		case 2:
+			controlled = false
+			pathLock = ""
+			break
+		case 3:
+			fallthrough
+		default:
+			pathLock = fmt.Sprintf("%s/%s", split[1], split[2])
+			controlled = true
+		}
+	}
+	return pathLock, controlled
+}
+
+// List will retrieve information from the data model at the specified path location
+// A list operation will force access to persistence storage
+func (p *Proxy) List(ctx context.Context, path string, depth int, deep bool, txid string) interface{} {
+	var effectivePath string
+	if path == "/" {
+		effectivePath = p.getFullPath()
+	} else {
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_LIST)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-list", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	rv := p.GetRoot().List(ctx, path, "", depth, deep, txid)
+
+	return rv
+}
+
+// Get will retrieve information from the data model at the specified path location
+func (p *Proxy) Get(ctx context.Context, path string, depth int, deep bool, txid string) interface{} {
+	var effectivePath string
+	if path == "/" {
+		effectivePath = p.getFullPath()
+	} else {
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_GET)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-get", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	rv := p.GetRoot().Get(ctx, path, "", depth, deep, txid)
+
+	return rv
+}
+
+// Update will modify information in the data model at the specified location with the provided data
+func (p *Proxy) Update(ctx context.Context, path string, data interface{}, strict bool, txid string) interface{} {
+	if !strings.HasPrefix(path, "/") {
+		log.Errorf("invalid path: %s", path)
+		return nil
+	}
+	var fullPath string
+	var effectivePath string
+	if path == "/" {
+		fullPath = p.getPath()
+		effectivePath = p.getFullPath()
+	} else {
+		fullPath = p.getPath() + path
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_UPDATE)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-update", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"full":       fullPath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	if p.GetRoot().KvStore != nil {
+		p.GetRoot().KvStore.Client.Reserve(pathLock+"_", uuid.New().String(), ReservationTTL)
+		defer p.GetRoot().KvStore.Client.ReleaseReservation(pathLock + "_")
+	}
+
+	result := p.GetRoot().Update(ctx, fullPath, data, strict, txid, nil)
+
+	if result != nil {
+		return result.GetData()
+	}
+
+	return nil
+}
+
+// AddWithID will insert new data at specified location.
+// This method also allows the user to specify the ID of the data entry to ensure
+// that access control is active while inserting the information.
+func (p *Proxy) AddWithID(ctx context.Context, path string, id string, data interface{}, txid string) interface{} {
+	if !strings.HasPrefix(path, "/") {
+		log.Errorf("invalid path: %s", path)
+		return nil
+	}
+	var fullPath string
+	var effectivePath string
+	if path == "/" {
+		fullPath = p.getPath()
+		effectivePath = p.getFullPath()
+	} else {
+		fullPath = p.getPath() + path
+		effectivePath = p.getFullPath() + path + "/" + id
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_ADD)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-add-with-id", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"full":       fullPath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	if p.GetRoot().KvStore != nil {
+		p.GetRoot().KvStore.Client.Reserve(pathLock+"_", uuid.New().String(), ReservationTTL)
+		defer p.GetRoot().KvStore.Client.ReleaseReservation(pathLock + "_")
+	}
+
+	result := p.GetRoot().Add(ctx, fullPath, data, txid, nil)
+
+	if result != nil {
+		return result.GetData()
+	}
+
+	return nil
+}
+
+// Add will insert new data at specified location.
+func (p *Proxy) Add(ctx context.Context, path string, data interface{}, txid string) interface{} {
+	if !strings.HasPrefix(path, "/") {
+		log.Errorf("invalid path: %s", path)
+		return nil
+	}
+	var fullPath string
+	var effectivePath string
+	if path == "/" {
+		fullPath = p.getPath()
+		effectivePath = p.getFullPath()
+	} else {
+		fullPath = p.getPath() + path
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_ADD)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-add", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"full":       fullPath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	if p.GetRoot().KvStore != nil {
+		p.GetRoot().KvStore.Client.Reserve(pathLock+"_", uuid.New().String(), ReservationTTL)
+		defer p.GetRoot().KvStore.Client.ReleaseReservation(pathLock + "_")
+	}
+
+	result := p.GetRoot().Add(ctx, fullPath, data, txid, nil)
+
+	if result != nil {
+		return result.GetData()
+	}
+
+	return nil
+}
+
+// Remove will delete an entry at the specified location
+func (p *Proxy) Remove(ctx context.Context, path string, txid string) interface{} {
+	if !strings.HasPrefix(path, "/") {
+		log.Errorf("invalid path: %s", path)
+		return nil
+	}
+	var fullPath string
+	var effectivePath string
+	if path == "/" {
+		fullPath = p.getPath()
+		effectivePath = p.getFullPath()
+	} else {
+		fullPath = p.getPath() + path
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_REMOVE)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-remove", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"full":       fullPath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	if p.GetRoot().KvStore != nil {
+		p.GetRoot().KvStore.Client.Reserve(pathLock+"_", uuid.New().String(), ReservationTTL)
+		defer p.GetRoot().KvStore.Client.ReleaseReservation(pathLock + "_")
+	}
+
+	result := p.GetRoot().Remove(ctx, fullPath, txid, nil)
+
+	if result != nil {
+		return result.GetData()
+	}
+
+	return nil
+}
+
+// CreateProxy to interact with specific path directly
+func (p *Proxy) CreateProxy(ctx context.Context, path string, exclusive bool) *Proxy {
+	if !strings.HasPrefix(path, "/") {
+		log.Errorf("invalid path: %s", path)
+		return nil
+	}
+
+	var fullPath string
+	var effectivePath string
+	if path == "/" {
+		fullPath = p.getPath()
+		effectivePath = p.getFullPath()
+	} else {
+		fullPath = p.getPath() + path
+		effectivePath = p.getFullPath() + path
+	}
+
+	pathLock, controlled := p.parseForControlledPath(effectivePath)
+
+	p.SetOperation(PROXY_CREATE)
+	defer p.SetOperation(PROXY_NONE)
+
+	log.Debugw("proxy-create", log.Fields{
+		"path":       path,
+		"effective":  effectivePath,
+		"full":       fullPath,
+		"pathLock":   pathLock,
+		"controlled": controlled,
+		"operation":  p.GetOperation(),
+	})
+
+	if p.GetRoot().KvStore != nil {
+		p.GetRoot().KvStore.Client.Reserve(pathLock+"_", uuid.New().String(), ReservationTTL)
+		defer p.GetRoot().KvStore.Client.ReleaseReservation(pathLock + "_")
+	}
+
+	return p.GetRoot().CreateProxy(ctx, fullPath, exclusive)
+}
+
+// OpenTransaction creates a new transaction branch to isolate operations made to the data model
+func (p *Proxy) OpenTransaction() *Transaction {
+	txid := p.GetRoot().MakeTxBranch()
+	return NewTransaction(p, txid)
+}
+
+// commitTransaction will apply and merge modifications made in the transaction branch to the data model
+func (p *Proxy) commitTransaction(txid string) {
+	p.GetRoot().FoldTxBranch(txid)
+}
+
+// cancelTransaction will terminate a transaction branch along will all changes within it
+func (p *Proxy) cancelTransaction(txid string) {
+	p.GetRoot().DeleteTxBranch(txid)
+}
+
+// CallbackFunction is a type used to define callback functions
+type CallbackFunction func(args ...interface{}) interface{}
+
+// CallbackTuple holds the function and arguments details of a callback
+type CallbackTuple struct {
+	callback CallbackFunction
+	args     []interface{}
+}
+
+// Execute will process the a callback with its provided arguments
+func (tuple *CallbackTuple) Execute(contextArgs []interface{}) interface{} {
+	args := []interface{}{}
+
+	for _, ta := range tuple.args {
+		args = append(args, ta)
+	}
+
+	if contextArgs != nil {
+		for _, ca := range contextArgs {
+			args = append(args, ca)
+		}
+	}
+
+	return tuple.callback(args...)
+}
+
+// RegisterCallback associates a callback to the proxy
+func (p *Proxy) RegisterCallback(callbackType CallbackType, callback CallbackFunction, args ...interface{}) {
+	if p.getCallbacks(callbackType) == nil {
+		p.setCallbacks(callbackType, make(map[string]*CallbackTuple))
+	}
+	funcName := runtime.FuncForPC(reflect.ValueOf(callback).Pointer()).Name()
+	log.Debugf("value of function: %s", funcName)
+	funcHash := fmt.Sprintf("%x", md5.Sum([]byte(funcName)))[:12]
+
+	p.setCallback(callbackType, funcHash, &CallbackTuple{callback, args})
+}
+
+// UnregisterCallback removes references to a callback within a proxy
+func (p *Proxy) UnregisterCallback(callbackType CallbackType, callback CallbackFunction, args ...interface{}) {
+	if p.getCallbacks(callbackType) == nil {
+		log.Errorf("no such callback type - %s", callbackType.String())
+		return
+	}
+
+	funcName := runtime.FuncForPC(reflect.ValueOf(callback).Pointer()).Name()
+	funcHash := fmt.Sprintf("%x", md5.Sum([]byte(funcName)))[:12]
+
+	log.Debugf("value of function: %s", funcName)
+
+	if p.getCallback(callbackType, funcHash) == nil {
+		log.Errorf("function with hash value: '%s' not registered with callback type: '%s'", funcHash, callbackType)
+		return
+	}
+
+	p.DeleteCallback(callbackType, funcHash)
+}
+
+func (p *Proxy) invoke(callback *CallbackTuple, context []interface{}) (result interface{}, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			errStr := fmt.Sprintf("callback error occurred: %+v", r)
+			err = errors.New(errStr)
+			log.Error(errStr)
+		}
+	}()
+
+	result = callback.Execute(context)
+
+	return result, err
+}
+
+// InvokeCallbacks executes all callbacks associated to a specific type
+func (p *Proxy) InvokeCallbacks(args ...interface{}) (result interface{}) {
+	callbackType := args[0].(CallbackType)
+	proceedOnError := args[1].(bool)
+	context := args[2:]
+
+	var err error
+
+	if callbacks := p.getCallbacks(callbackType); callbacks != nil {
+		p.mutex.Lock()
+		for _, callback := range callbacks {
+			if result, err = p.invoke(callback, context); err != nil {
+				if !proceedOnError {
+					log.Info("An error occurred.  Stopping callback invocation")
+					break
+				}
+				log.Info("An error occurred.  Invoking next callback")
+			}
+		}
+		p.mutex.Unlock()
+	}
+
+	return result
+}