diff --git a/sql/upgrades/120.sql b/sql/upgrades/120.sql
new file mode 100644
--- /dev/null
+++ b/sql/upgrades/120.sql
@@ -0,0 +1,61 @@
+-- SWH Indexer DB schema upgrade
+-- from_version: 119
+-- to_version: 120
+-- description: fix updates of the 'mappings' column in metadata tables
+
+insert into dbversion(version, release, description)
+values(120, now(), 'Work In Progress');
+
+create or replace function swh_revision_metadata_add(conflict_update boolean)
+    returns void
+    language plpgsql
+as $$
+begin
+    if conflict_update then
+      insert into revision_metadata (id, translated_metadata, mappings, indexer_configuration_id)
+      select id, translated_metadata, mappings, indexer_configuration_id
+    	from tmp_revision_metadata tcm
+            on conflict(id, indexer_configuration_id)
+                do update set
+                    translated_metadata = excluded.translated_metadata,
+                    mappings = excluded.mappings;
+
+    else
+        insert into revision_metadata (id, translated_metadata, mappings, indexer_configuration_id)
+        select id, translated_metadata, mappings, indexer_configuration_id
+    	from tmp_revision_metadata tcm
+            on conflict(id, indexer_configuration_id)
+            do nothing;
+    end if;
+    return;
+end
+$$;
+
+create or replace function swh_origin_intrinsic_metadata_add(
+        conflict_update boolean)
+    returns void
+    language plpgsql
+as $$
+begin
+    perform swh_origin_intrinsic_metadata_compute_tsvector();
+    if conflict_update then
+      insert into origin_intrinsic_metadata (origin_id, metadata, indexer_configuration_id, from_revision, metadata_tsvector, mappings)
+      select origin_id, metadata, indexer_configuration_id, from_revision,
+             metadata_tsvector, mappings
+    	from tmp_origin_intrinsic_metadata
+            on conflict(origin_id, indexer_configuration_id)
+                do update set
+                    metadata = excluded.metadata,
+                    mappings = excluded.mappings;
+
+    else
+        insert into origin_intrinsic_metadata (origin_id, metadata, indexer_configuration_id, from_revision, metadata_tsvector, mappings)
+        select origin_id, metadata, indexer_configuration_id, from_revision,
+               metadata_tsvector, mappings
+    	from tmp_origin_intrinsic_metadata
+            on conflict(origin_id, indexer_configuration_id)
+            do nothing;
+    end if;
+    return;
+end
+$$;
diff --git a/swh/indexer/sql/40-swh-func.sql b/swh/indexer/sql/40-swh-func.sql
--- a/swh/indexer/sql/40-swh-func.sql
+++ b/swh/indexer/sql/40-swh-func.sql
@@ -319,7 +319,9 @@
       select id, translated_metadata, mappings, indexer_configuration_id
     	from tmp_revision_metadata tcm
             on conflict(id, indexer_configuration_id)
-                do update set translated_metadata = excluded.translated_metadata;
+                do update set
+                    translated_metadata = excluded.translated_metadata,
+                    mappings = excluded.mappings;
 
     else
         insert into revision_metadata (id, translated_metadata, mappings, indexer_configuration_id)
@@ -415,7 +417,9 @@
              metadata_tsvector, mappings
     	from tmp_origin_intrinsic_metadata
             on conflict(origin_id, indexer_configuration_id)
-                do update set metadata = excluded.metadata;
+                do update set
+                    metadata = excluded.metadata,
+                    mappings = excluded.mappings;
 
     else
         insert into origin_intrinsic_metadata (origin_id, metadata, indexer_configuration_id, from_revision, metadata_tsvector, mappings)
diff --git a/swh/indexer/tests/storage/test_storage.py b/swh/indexer/tests/storage/test_storage.py
--- a/swh/indexer/tests/storage/test_storage.py
+++ b/swh/indexer/tests/storage/test_storage.py
@@ -1295,7 +1295,7 @@
                 'softwareRequirements': None,
                 'identifier': None
             },
-            'mappings': [],
+            'mappings': ['mapping1'],
             'indexer_configuration_id': tool_id,
         }
 
@@ -1309,7 +1309,7 @@
         expected_metadata_v1 = [{
             'id': self.revision_id_1,
             'translated_metadata':  metadata_v1['translated_metadata'],
-            'mappings': [],
+            'mappings': ['mapping1'],
             'tool': self.tools['swh-metadata-detector']
         }]
 
@@ -1322,6 +1322,7 @@
                 'name': 'test_metadata',
                 'author': 'MG',
             },
+            'mappings': ['mapping2'],
         })
 
         self.storage.revision_metadata_add([metadata_v2])
@@ -1356,7 +1357,7 @@
                 'softwareRequirements': None,
                 'identifier': None
             },
-            'mappings': [],
+            'mappings': ['mapping1'],
             'indexer_configuration_id': tool_id,
         }
 
@@ -1371,7 +1372,7 @@
         expected_metadata_v1 = [{
             'id': self.revision_id_2,
             'translated_metadata':  metadata_v1['translated_metadata'],
-            'mappings': [],
+            'mappings': ['mapping1'],
             'tool': self.tools['swh-metadata-detector']
         }]
         self.assertEqual(actual_metadata, expected_metadata_v1)
@@ -1383,6 +1384,7 @@
                 'name': 'test_update_duplicated_metadata',
                 'author': 'MG'
             },
+            'mappings': ['mapping2'],
         })
         self.storage.revision_metadata_add([metadata_v2], conflict_update=True)
 
@@ -1392,7 +1394,7 @@
         expected_metadata_v2 = [{
             'id': self.revision_id_2,
             'translated_metadata': metadata_v2['translated_metadata'],
-            'mappings': [],
+            'mappings': ['mapping2'],
             'tool': self.tools['swh-metadata-detector']
         }]