diff --git a/internal/storage/bucket/migrations/18-transactions-fill-inserted-at/up.sql b/internal/storage/bucket/migrations/18-transactions-fill-inserted-at/up.sql
index c87d6ec9a..440a588e9 100644
--- a/internal/storage/bucket/migrations/18-transactions-fill-inserted-at/up.sql
+++ b/internal/storage/bucket/migrations/18-transactions-fill-inserted-at/up.sql
@@ -1,12 +1,21 @@
 do $$
 	declare
+		_ledger record;
+		_vsql text;
 		_batch_size integer := 1000;
 		_date timestamp without time zone;
 		_count integer := 0;
 	begin
-		--todo: take explicit advisory lock to avoid concurrent migrations when the service is killed
 		set search_path = '{{.Schema}}';
 
+		-- cannot disable triggers at session level on Azure Postgres with no superuser privileges.
+		-- so we modify the trigger acting on transaction update to be triggered only if the metadata column is updated.
+		-- by the way, it's a good move to not trigger the update_transaction_metadata_history function on every update if not necessary.
+		for _ledger in select * from _system.ledgers where bucket = current_schema loop
+			_vsql = 'create or replace trigger "update_transaction_metadata_history_' || _ledger.id || '" after update of metadata on "transactions" for each row when (new.ledger = ''' || _ledger.name || ''') execute procedure update_transaction_metadata_history()';
+			execute _vsql;
+		end loop;
+
 		-- select the date where the "11-make-stateless" migration has been applied
 		select tstamp into _date
 		from _system.goose_db_version
@@ -25,9 +34,6 @@ do $$
 		perform pg_notify('migrations-{{ .Schema }}', 'init: ' || _count);
 
 		for i in 0.._count-1 by _batch_size loop
-			-- disable triggers
-			set session_replication_role = replica;
-
 			with _rows as (
 				select *
 				from logs_transactions
@@ -40,9 +46,6 @@ do $$
 			from _rows
 			where transactions.ledger = _rows.ledger and transactions.id = _rows.transaction_id;
 
-			-- enable triggers
-			set session_replication_role = default;
-
 			commit;
 
 			perform pg_notify('migrations-{{ .Schema }}', 'continue: ' || _batch_size);
diff --git a/internal/storage/bucket/migrations/19-transactions-fill-pcv/up.sql b/internal/storage/bucket/migrations/19-transactions-fill-pcv/up.sql
index 0c2d9d944..126ec836d 100644
--- a/internal/storage/bucket/migrations/19-transactions-fill-pcv/up.sql
+++ b/internal/storage/bucket/migrations/19-transactions-fill-pcv/up.sql
@@ -30,9 +30,6 @@ do $$
 
 		perform pg_notify('migrations-{{ .Schema }}', 'init: ' || (select count(*) from moves_view));
 
-		-- disable triggers
-		set session_replication_role = replica;
-
 		loop
 			with data as (
 				select transactions_id, volumes
@@ -54,9 +51,6 @@ do $$
 			commit;
 		end loop;
 
-		-- enable triggers
-		set session_replication_role = default;
-
 		drop table if exists moves_view;
 
  		alter table transactions