Add trigger that ensures row in template_redacted is created

when adding new template through a migration

migrations/versions/0296_template_redacted_fix.py

@@ -21,6 +21,32 @@ def upgrade():
         ;
     """)
 
+    op.execute("""
+        create or replace function insert_redacted()
+            returns trigger AS
+        $$
+        BEGIN
+            INSERT INTO template_redacted (template_id, redact_personalisation, updated_at, updated_by_id)
+            SELECT templates.id, FALSE, now(), templates.created_by_id
+            FROM templates
+            WHERE templates.id NOT IN (SELECT template_id FROM template_redacted WHERE template_id = templates.id);
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+    """)
+
+    op.execute("""
+        CREATE TRIGGER insert_template_redacted AFTER INSERT ON templates
+        FOR EACH ROW
+        EXECUTE PROCEDURE insert_redacted();
+    """)
+
 
 def downgrade():
-    pass
+    op.execute("""
+        drop trigger insert_template_redacted ON templates
+    """)
+
+    op.execute("""
+        drop function insert_redacted();
+    """)