feat: get impersonation token implementation

sql/migrations/000001_init.up.sql

@@ -33,8 +33,6 @@ CREATE TABLE users (
     last_login          timestamptz
 );
 
-
-
 CREATE TABLE studios (
     id                  bigint              GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
     studio_name         text                NOT NULL UNIQUE,
@@ -106,7 +104,8 @@ CREATE TABLE signals (
 
 CREATE TABLE external_services (
     id                  bigint              GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-    name                text                UNIQUE NOT NULL
+    name                text                UNIQUE NOT NULL,
+    auth_token          text
 );
 
 CREATE TABLE external_ids (