Create required workflow context

Initially, the workflow context record did not seem all that important,
but as turns out during further testing, it should contain 'is_transaction' = 1.

sql/changes/1.11/workflow-for-aa-transactions.sql

@@ -15,6 +15,15 @@ new_workflow AS (
          now() as last_update
     FROM aa_transactions
   RETURNING workflow_id, state, last_update
+),
+new_context AS (
+  INSERT INTO workflow_context
+  SELECT workflow_id, jsonb_build_object( 'is_transaction', 1,
+                                         'transdate', transdate,
+                                         'table_name', table_name)
+    FROM new_workflow
+           JOIN aa_transactions USING (workflow_id)
+  RETURNING workflow_id
 )
     INSERT INTO workflow_history
 SELECT nextval('workflow_History_seq') as workflow_hist_id,
@@ -24,4 +33,4 @@ SELECT nextval('workflow_History_seq') as workflow_hist_id,
        state,
        '<upgrade>' as workflow_user,
        last_update as history_date
-  FROM new_workflow;
+  FROM new_context JOIN new_workflow USING (workflow_id);