IO-1865 Add employee external ID

hasura/metadata/tables.yaml

@@ -1955,6 +1955,7 @@
           - active
           - created_at
           - employee_number
+          - external_id
           - first_name
           - flat_rate
           - hire_date
@@ -1973,6 +1974,7 @@
           - active
           - created_at
           - employee_number
+          - external_id
           - first_name
           - flat_rate
           - hire_date
@@ -2001,6 +2003,7 @@
           - active
           - created_at
           - employee_number
+          - external_id
           - first_name
           - flat_rate
           - hire_date

hasura/migrations/1651854742243_alter_table_public_employees_add_column_external_id/down.sql

@@ -0,0 +1,4 @@
+-- Could not auto-generate a down migration.
+-- Please write an appropriate down migration for the SQL below:
+-- alter table "public"."employees" add column "external_id" text
+--  null;

hasura/migrations/1651854742243_alter_table_public_employees_add_column_external_id/up.sql

@@ -0,0 +1,2 @@
+alter table "public"."employees" add column "external_id" text
+ null;