replace the view ocpp_tag_activity (steve-community#1219)

Author: goekay

src/main/resources/db/migration/V1_0_4__update.sql

@@ -0,0 +1,17 @@
+-- came with https://github.com/steve-community/steve/issues/1219
+CREATE OR REPLACE VIEW ocpp_tag_activity AS
+select `o`.*,
+       count(`t`.`id_tag`)                                                AS `active_transaction_count`,
+       case when count(`t`.`id_tag`) > 0 then 1 else 0 end                AS `in_transaction`,
+       case when `o`.`max_active_transaction_count` = 0 then 1 else 0 end AS `blocked`
+from `ocpp_tag` `o` left join `transaction` `t` on (
+    `o`.`id_tag` = `t`.`id_tag` and
+    `t`.`stop_timestamp` is null and
+    `t`.`stop_value` is null)
+group by
+    `o`.`ocpp_tag_pk`,
+    `o`.`id_tag`,
+    `o`.`parent_id_tag`,
+    `o`.`expiry_date`,
+    `o`.`max_active_transaction_count`,
+    `o`.`note`;