Assign production plans to Graphs users

backend/db.js

@@ -792,6 +792,13 @@ const initDB = async () => {
             ALTER COLUMN updated_at SET DEFAULT CURRENT_TIMESTAMP;
         `).catch(() => {});
 
+        // A production plan is operated by a Graphs user. The ID link will let
+        // role-based assignments be added without changing historical plans.
+        await pool.query(`
+            ALTER TABLE production_plans
+            ADD COLUMN IF NOT EXISTS responsible_user_id INTEGER REFERENCES app_users(id) ON DELETE SET NULL;
+        `).catch(() => {});
+
         await pool.query(`
             ALTER TABLE stock_campaign_queue
             ALTER COLUMN created_at TYPE TIMESTAMPTZ USING created_at AT TIME ZONE 'America/Sao_Paulo',