diff --git a/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/notes.yaml b/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/notes.yaml
new file mode 100644
index 000000000..4b7c24021
--- /dev/null
+++ b/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/notes.yaml
@@ -0,0 +1 @@
+name: Recreate accounts unique index
diff --git a/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/up.sql b/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/up.sql
new file mode 100644
index 000000000..1d8734023
--- /dev/null
+++ b/internal/storage/bucket/migrations/19-accounts-recreate-unique-index/up.sql
@@ -0,0 +1,9 @@
+-- There is already a covering index on accounts table (including seq column).
+-- As we will remove the seq column in next migration, we have to create a new index without it (PG will remove it automatically in background).
+-- Also, we create the index concurrently to avoid locking the table.
+-- And, as there is already an index on this table, the index creation should not fail.
+--
+-- We create this index in a dedicated as, as the doc mentions it (https://www.postgresql.org/docs/current/protocol-flow.html#PROTOCOL-FLOW-MULTI-STATEMENT)
+-- multi statements queries are automatically wrapped inside transaction block, and it's forbidden
+-- to create index concurrently inside a transaction block.
+create unique index concurrently accounts_ledger2 on "{{.Bucket}}".accounts (ledger, address)
\ No newline at end of file
diff --git a/internal/storage/bucket/migrations/19-clean-database/notes.yaml b/internal/storage/bucket/migrations/20-clean-database/notes.yaml
similarity index 100%
rename from internal/storage/bucket/migrations/19-clean-database/notes.yaml
rename to internal/storage/bucket/migrations/20-clean-database/notes.yaml
diff --git a/internal/storage/bucket/migrations/19-clean-database/up.sql b/internal/storage/bucket/migrations/20-clean-database/up.sql
similarity index 79%
rename from internal/storage/bucket/migrations/19-clean-database/up.sql
rename to internal/storage/bucket/migrations/20-clean-database/up.sql
index 39597ae54..92aa70f53 100644
--- a/internal/storage/bucket/migrations/19-clean-database/up.sql
+++ b/internal/storage/bucket/migrations/20-clean-database/up.sql
@@ -73,4 +73,54 @@ alter table accounts_metadata
 drop column accounts_seq;
 
 alter table transactions
+drop column seq;
+
+alter table accounts
+drop column seq;
+
+-- rename index create in previous migration, as the drop of the column seq of accounts table has automatically dropped the index accounts_ledger
+alter index accounts_ledger2
+rename to accounts_ledger;
+
+create or replace function set_log_hash()
+	returns trigger
+	security definer
+	language plpgsql
+as
+$$
+declare
+	previousHash bytea;
+	marshalledAsJSON varchar;
+begin
+	select hash into previousHash
+	from logs
+	where ledger = new.ledger
+	order by id desc
+	limit 1;
+
+	-- select only fields participating in the hash on the backend and format json representation the same way
+	select '{' ||
+		'"type":"' || new.type || '",' ||
+		'"data":' || encode(new.memento, 'escape') || ',' ||
+		'"date":"' || (to_json(new.date::timestamp)#>>'{}') || 'Z",' ||
+		'"idempotencyKey":"' || coalesce(new.idempotency_key, '') || '",' ||
+		'"id":0,' ||
+		'"hash":null' ||
+   '}' into marshalledAsJSON;
+
+	new.hash = (
+		select public.digest(
+			case
+			when previousHash is null
+			then marshalledAsJSON::bytea
+			else '"' || encode(previousHash::bytea, 'base64')::bytea || E'"\n' || convert_to(marshalledAsJSON, 'LATIN1')::bytea
+			end || E'\n', 'sha256'::text
+		)
+	);
+
+	return new;
+end;
+$$ set search_path from current;
+
+alter table logs
 drop column seq;
\ No newline at end of file
diff --git a/internal/storage/driver/driver.go b/internal/storage/driver/driver.go
index 08f6e8a3e..2e220743b 100644
--- a/internal/storage/driver/driver.go
+++ b/internal/storage/driver/driver.go
@@ -35,10 +35,6 @@ type Driver struct {
 
 func (d *Driver) CreateLedger(ctx context.Context, l *ledger.Ledger) (*ledgerstore.Store, error) {
 
-	if l.Metadata == nil {
-		l.Metadata = metadata.Metadata{}
-	}
-
 	b := bucket.New(d.db, l.Bucket)
 	if err := b.Migrate(ctx, d.tracer); err != nil {
 		return nil, fmt.Errorf("migrating bucket: %w", err)