send impersonator user id field to db

Author: stephschustermann

packages/server/src/AccountsServer.js

@@ -375,7 +375,10 @@ export class AccountsServer {
         return { authorized: false };
       }
 
-      const newSessionId = await this.db.createSession(impersonatedUser.id, ip, userAgent);
+      const newSessionId = await this.db.createSession(impersonatedUser.id,
+                                                       ip,
+                                                       userAgent,
+                                                       { impersonatorUserId: user.id });
       const impersonationTokens = this.createTokens(newSessionId, true);
       const impersonationResult = {
         authorized: true,

packages/server/src/DBInterface.js

@@ -33,7 +33,7 @@ export interface DBInterface {
 
   // Session related operations
   findSessionById(sessionId: string) : Promise<?SessionType>,
-  createSession(userId: string, ip: ?string, userAgent: ?string) : Promise<string>,
+  createSession(userId: string, ip: ?string, userAgent: ?string, extraData: ?string) : Promise<string>,
   updateSession(sessionId: string, ip: string, userAgent: string) : Promise<void>,
   invalidateSession(sessionId: string): Promise<void>,
   invalidateAllSessions(userId: string): Promise<void>