fix(backend-pg): userID is nullable

backend/pkg/db/cache/messages_common.go

@@ -36,7 +36,7 @@ func (c *PGCache) InsertUserID(sessionID uint64, userID *IOSUserID) error {
 	if err != nil {
 		return err
 	}
-	session.UserID = userID.Value
+	session.UserID = &userID.Value
 	return nil
 }
 

backend/pkg/db/cache/messages_web.go

@@ -29,7 +29,7 @@ func (c *PGCache) InsertWebSessionStart(sessionID uint64, s *SessionStart) error
 		UserDeviceType:       s.UserDeviceType,
 		UserDeviceMemorySize: s.UserDeviceMemorySize,
 		UserDeviceHeapSize:   s.UserDeviceHeapSize,
-		UserID:               s.UserID,
+		UserID: 							&s.UserID,
 	}
 	if err := c.Conn.InsertSessionStart(sessionID, c.sessions[sessionID]); err != nil {
 		c.sessions[sessionID] = nil

backend/pkg/db/types/session.go

@@ -16,7 +16,8 @@ type Session struct {
 	PagesCount      int
 	EventsCount     int
 	ErrorsCount     int
-	UserID          string // pointer??
+
+	UserID          *string // pointer??
 	UserAnonymousID *string
 	Metadata1       *string
 	Metadata2       *string