Update GetExecution SQL query to include database_id and database_pg_version

internal/service/executions/get_execution.sql

@@ -1,6 +1,7 @@
 -- name: ExecutionsServiceGetExecution :one
 SELECT
   executions.*,
+  databases.id AS database_id,
   databases.pg_version AS database_pg_version
 FROM executions
 INNER JOIN backups ON backups.id = executions.backup_id