diff --git a/swh/loader/core/loader.py b/swh/loader/core/loader.py
--- a/swh/loader/core/loader.py
+++ b/swh/loader/core/loader.py
@@ -411,23 +411,22 @@
             self.save_data()
 
         if self.has_contents():
-            contents = []
-            skipped_contents = []
             for obj in self.get_contents():
                 if isinstance(obj, Content):
-                    contents.append(obj)
+                    self.storage.content_add([obj])
                 elif isinstance(obj, SkippedContent):
-                    skipped_contents.append(obj)
+                    self.storage.skipped_content_add([obj])
                 else:
                     raise TypeError(f"Unexpected content type: {obj}")
-            self.storage.skipped_content_add(skipped_contents)
-            self.storage.content_add(contents)
         if self.has_directories():
-            self.storage.directory_add(list(self.get_directories()))
+            for directory in self.get_directories():
+                self.storage.directory_add([directory])
         if self.has_revisions():
-            self.storage.revision_add(list(self.get_revisions()))
+            for revision in self.get_revisions():
+                self.storage.revision_add([revision])
         if self.has_releases():
-            self.storage.release_add(list(self.get_releases()))
+            for release in self.get_releases():
+                self.storage.release_add([release])
         snapshot = self.get_snapshot()
         self.storage.snapshot_add([snapshot])
         self.flush()
diff --git a/swh/loader/package/archive/tests/test_archive.py b/swh/loader/package/archive/tests/test_archive.py
--- a/swh/loader/package/archive/tests/test_archive.py
+++ b/swh/loader/package/archive/tests/test_archive.py
@@ -96,7 +96,6 @@
         "directory": 0,
         "origin": 1,
         "origin_visit": 1,
-        "person": 0,
         "release": 0,
         "revision": 0,
         "skipped_content": 0,
@@ -163,7 +162,6 @@
         "directory": len(_expected_new_directories_first_visit),
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit),
         "skipped_content": 0,
@@ -243,7 +241,6 @@
         "directory": len(_expected_new_directories_first_visit),
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit),
         "skipped_content": 0,
@@ -281,7 +278,6 @@
         "directory": len(_expected_new_directories_first_visit) + 8,
         "origin": 1,
         "origin_visit": 1 + 1,
-        "person": 1,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit) + 1,
         "skipped_content": 0,
diff --git a/swh/loader/package/cran/tests/test_cran.py b/swh/loader/package/cran/tests/test_cran.py
--- a/swh/loader/package/cran/tests/test_cran.py
+++ b/swh/loader/package/cran/tests/test_cran.py
@@ -191,7 +191,6 @@
         "directory": 7,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
@@ -238,7 +237,6 @@
         "directory": 7,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
diff --git a/swh/loader/package/debian/tests/test_debian.py b/swh/loader/package/debian/tests/test_debian.py
--- a/swh/loader/package/debian/tests/test_debian.py
+++ b/swh/loader/package/debian/tests/test_debian.py
@@ -122,7 +122,6 @@
         "directory": 2,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,  # all artifacts under 1 revision
         "skipped_content": 0,
@@ -166,7 +165,6 @@
         "directory": 2,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,  # all artifacts under 1 revision
         "skipped_content": 0,
@@ -196,7 +194,6 @@
         "directory": 2 + 0,
         "origin": 1,
         "origin_visit": 1 + 1,  # a new visit occurred
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
diff --git a/swh/loader/package/deposit/tests/test_deposit.py b/swh/loader/package/deposit/tests/test_deposit.py
--- a/swh/loader/package/deposit/tests/test_deposit.py
+++ b/swh/loader/package/deposit/tests/test_deposit.py
@@ -69,7 +69,6 @@
         "directory": 0,
         "origin": 0,
         "origin_visit": 0,
-        "person": 0,
         "release": 0,
         "revision": 0,
         "skipped_content": 0,
@@ -105,7 +104,6 @@
         "directory": 0,
         "origin": 1,
         "origin_visit": 1,
-        "person": 0,
         "release": 0,
         "revision": 0,
         "skipped_content": 0,
@@ -165,7 +163,6 @@
         "directory": 12,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
diff --git a/swh/loader/package/nixguix/tests/test_nixguix.py b/swh/loader/package/nixguix/tests/test_nixguix.py
--- a/swh/loader/package/nixguix/tests/test_nixguix.py
+++ b/swh/loader/package/nixguix/tests/test_nixguix.py
@@ -253,7 +253,6 @@
         "directory": 3,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
@@ -379,7 +378,6 @@
         "directory": 3,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
@@ -431,7 +429,6 @@
         "directory": 5,
         "origin": 1,
         "origin_visit": 2,
-        "person": 1,
         "release": 0,
         "revision": 2,
         "skipped_content": 0,
diff --git a/swh/loader/package/npm/tests/test_npm.py b/swh/loader/package/npm/tests/test_npm.py
--- a/swh/loader/package/npm/tests/test_npm.py
+++ b/swh/loader/package/npm/tests/test_npm.py
@@ -359,7 +359,6 @@
         "directory": len(_expected_new_directories_first_visit),
         "origin": 1,
         "origin_visit": 1,
-        "person": 2,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit),
         "skipped_content": 0,
@@ -450,7 +449,6 @@
         "directory": len(_expected_new_directories_first_visit),
         "origin": 1,
         "origin_visit": 1,
-        "person": 2,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit),
         "skipped_content": 0,
@@ -476,7 +474,6 @@
         "directory": len(_expected_new_directories_first_visit) + 15,
         "origin": 1,
         "origin_visit": 2,
-        "person": 2,
         "release": 0,
         "revision": len(_expected_new_revisions_first_visit) + 3,
         "skipped_content": 0,
@@ -514,7 +511,6 @@
         "directory": 153,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 2,
         "skipped_content": 0,
diff --git a/swh/loader/package/pypi/tests/test_pypi.py b/swh/loader/package/pypi/tests/test_pypi.py
--- a/swh/loader/package/pypi/tests/test_pypi.py
+++ b/swh/loader/package/pypi/tests/test_pypi.py
@@ -234,7 +234,6 @@
         "directory": 0,
         "origin": 1,
         "origin_visit": 1,
-        "person": 0,
         "release": 0,
         "revision": 0,
         "skipped_content": 0,
@@ -266,7 +265,6 @@
             "directory": 0,
             "origin": 1,
             "origin_visit": 1,
-            "person": 0,
             "release": 0,
             "revision": 0,
             "skipped_content": 0,
@@ -384,7 +382,6 @@
         "directory": 2,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 1,
         "skipped_content": 0,
@@ -463,7 +460,6 @@
         "directory": 4,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 2,
         "skipped_content": 0,
@@ -554,7 +550,6 @@
         "directory": 4,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 2,
         "skipped_content": 0,
@@ -622,7 +617,6 @@
         "directory": 4,
         "origin": 1,
         "origin_visit": 1,
-        "person": 1,
         "release": 0,
         "revision": 2,
         "skipped_content": 0,
@@ -652,7 +646,6 @@
         "directory": 4 + 2,  # 2 more directories
         "origin": 1,
         "origin_visit": 1 + 1,
-        "person": 1,
         "release": 0,
         "revision": 2 + 1,  # 1 more revision
         "skipped_content": 0,
diff --git a/swh/loader/tests/__init__.py b/swh/loader/tests/__init__.py
--- a/swh/loader/tests/__init__.py
+++ b/swh/loader/tests/__init__.py
@@ -252,7 +252,6 @@
         "directory",
         "origin",
         "origin_visit",
-        "person",
         "release",
         "revision",
         "skipped_content",