diff --git a/app/data/repositories/common.py b/app/data/repositories/common.py
index 63946f84..b82117c2 100644
--- a/app/data/repositories/common.py
+++ b/app/data/repositories/common.py
@@ -38,3 +38,9 @@ def get_source_by_id(self, source_id: int) -> model.Bibliography:
         row = self._storage.query_one(template.GET_SOURCE_BY_ID, params=[source_id])
 
         return model.Bibliography(**row)
+
+    def register_pgcs(self, pgcs: list[int]):
+        self._storage.exec(
+            f"INSERT INTO common.pgc (id) VALUES {','.join(['(%s)'] * len(pgcs))} ON CONFLICT (id) DO NOTHING",
+            params=pgcs,
+        )
diff --git a/app/data/repositories/layer0/objects.py b/app/data/repositories/layer0/objects.py
index 7556107d..ae561770 100644
--- a/app/data/repositories/layer0/objects.py
+++ b/app/data/repositories/layer0/objects.py
@@ -173,21 +173,36 @@ def add_crossmatch_result(self, data: dict[str, model.CIResult]) -> None:
         self._storage.exec(query, params=params)
 
     def upsert_pgc(self, pgcs: dict[str, int | None]) -> None:
-        values = []
-        params = []
+        pgcs_to_insert: dict[str, int] = {}
+
+        new_objects = [object_id for object_id, pgc in pgcs.items() if pgc is None]
+
+        if new_objects:
+            result = self._storage.query(
+                f"""INSERT INTO common.pgc 
+                VALUES {",".join(["(DEFAULT)"] * len(new_objects))} 
+                RETURNING id""",
+            )
+
+            ids = [row["id"] for row in result]
+
+            for object_id, pgc_id in zip(new_objects, ids, strict=False):
+                pgcs_to_insert[object_id] = pgc_id
 
         for object_id, pgc in pgcs.items():
-            params.append(object_id)
-            if pgc is None:
-                values.append("(%s, DEFAULT)")
-            else:
+            if pgc is not None:
+                pgcs_to_insert[object_id] = pgc
+
+        if pgcs_to_insert:
+            update_query = "UPDATE rawdata.objects SET pgc = v.pgc FROM (VALUES "
+            params = []
+            values = []
+
+            for object_id, pgc_id in pgcs_to_insert.items():
                 values.append("(%s, %s)")
-                params.append(pgc)
-
-        self._storage.exec(
-            f"""
-            INSERT INTO rawdata.pgc (object_id, id) VALUES {",".join(values)}
-            ON CONFLICT (object_id) DO UPDATE SET id = EXCLUDED.id
-            """,
-            params=params,
-        )
+                params.extend([object_id, pgc_id])
+
+            update_query += ",".join(values)
+            update_query += ") AS v(object_id, pgc) WHERE rawdata.objects.id = v.object_id"
+
+            self._storage.exec(update_query, params=params)
diff --git a/app/data/repositories/layer1.py b/app/data/repositories/layer1.py
index cfeb82f4..115ff304 100644
--- a/app/data/repositories/layer1.py
+++ b/app/data/repositories/layer1.py
@@ -70,16 +70,16 @@ def get_new_observations(
 
         query = f"""SELECT *
         FROM {object_cls.layer1_table()} AS l1
-        JOIN rawdata.pgc AS pgc ON l1.object_id = pgc.object_id
-        WHERE id IN (
-            SELECT DISTINCT id
+        JOIN rawdata.objects AS o ON l1.object_id = o.id
+        WHERE o.pgc IN (
+            SELECT DISTINCT o.pgc
             FROM {object_cls.layer1_table()} AS l1
-            JOIN rawdata.pgc AS pgc ON l1.object_id = pgc.object_id
-            WHERE modification_time > %s AND pgc.id > %s
-            ORDER BY id
+            JOIN rawdata.objects AS o ON l1.object_id = o.id
+            WHERE o.modification_time > %s AND o.pgc > %s
+            ORDER BY o.pgc
             LIMIT %s
         )
-        ORDER BY pgc.id ASC"""
+        ORDER BY o.pgc ASC"""
 
         rows = self._storage.query(query, params=[dt, offset, limit])
 
@@ -87,7 +87,7 @@ def get_new_observations(
 
         for row in rows:
             object_id = row.pop("object_id")
-            pgc = int(row.pop("id"))
+            pgc = int(row.pop("pgc"))
             catalog_object = object_cls.from_layer1(row)
 
             key = (pgc, object_id)
diff --git a/postgres/migrations/V014__common_pgc_connections.sql b/postgres/migrations/V014__common_pgc_connections.sql
new file mode 100644
index 00000000..2449e0c6
--- /dev/null
+++ b/postgres/migrations/V014__common_pgc_connections.sql
@@ -0,0 +1,23 @@
+ALTER TABLE layer2.cz
+ADD CONSTRAINT cz_pgc_fkey FOREIGN KEY (pgc) REFERENCES common.pgc(id) ON DELETE RESTRICT ON UPDATE CASCADE;
+ALTER TABLE layer2.designation
+ADD CONSTRAINT cz_pgc_fkey FOREIGN KEY (pgc) REFERENCES common.pgc(id) ON DELETE RESTRICT ON UPDATE CASCADE;
+ALTER TABLE layer2.icrs
+ADD CONSTRAINT cz_pgc_fkey FOREIGN KEY (pgc) REFERENCES common.pgc(id) ON DELETE RESTRICT ON UPDATE CASCADE;
+
+CREATE OR REPLACE FUNCTION rawdata_set_modification_time()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF NEW.pgc IS DISTINCT FROM OLD.pgc THEN
+        NEW.modification_time := now();
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER set_modification_time_on_pgc_update
+BEFORE UPDATE OF pgc ON rawdata.objects
+FOR EACH ROW
+EXECUTE FUNCTION rawdata_set_modification_time();
+
+DROP TABLE rawdata.pgc;
diff --git a/tests/integration/layer2_import_test.py b/tests/integration/layer2_import_test.py
index 64dc0044..42b948e8 100644
--- a/tests/integration/layer2_import_test.py
+++ b/tests/integration/layer2_import_test.py
@@ -42,6 +42,7 @@ def test_import_two_catalogs(self):
             ["123", "124"],
         )
 
+        self.common_repo.register_pgcs([1234, 1245])
         self.layer0_repo.upsert_pgc({"123": 1234, "124": 1245})
         self.layer1_repo.save_data(
             [
diff --git a/tests/integration/layer2_repository_test.py b/tests/integration/layer2_repository_test.py
index 92e13d27..bae56135 100644
--- a/tests/integration/layer2_repository_test.py
+++ b/tests/integration/layer2_repository_test.py
@@ -12,6 +12,7 @@ class Layer2RepositoryTest(unittest.TestCase):
     def setUpClass(cls) -> None:
         cls.pg_storage = lib.TestPostgresStorage.get()
 
+        cls.common_repo = repositories.CommonRepository(cls.pg_storage.get_storage(), structlog.get_logger())
         cls.layer2_repo = repositories.Layer2Repository(cls.pg_storage.get_storage(), structlog.get_logger())
 
     def tearDown(self):
@@ -23,6 +24,7 @@ def test_one_object(self):
             model.Layer2CatalogObject(2, model.DesignationCatalogObject(design="test2")),
         ]
 
+        self.common_repo.register_pgcs([1, 2])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query(
@@ -42,6 +44,7 @@ def test_several_objects(self):
             model.Layer2CatalogObject(2, model.ICRSCatalogObject(ra=11, dec=11, e_ra=0.1, e_dec=0.1)),
         ]
 
+        self.common_repo.register_pgcs([1, 2])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query(
@@ -65,6 +68,7 @@ def test_several_catalogs(self):
             model.Layer2CatalogObject(2, model.DesignationCatalogObject(design="test2")),
         ]
 
+        self.common_repo.register_pgcs([1, 2])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query(
@@ -94,6 +98,7 @@ def test_several_filters(self):
             model.Layer2CatalogObject(1, model.DesignationCatalogObject(design="test")),
         ]
 
+        self.common_repo.register_pgcs([1, 2])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query(
@@ -134,6 +139,7 @@ def test_pagination(self):
             model.Layer2CatalogObject(5, model.ICRSCatalogObject(ra=14, dec=14, e_ra=0.1, e_dec=0.1)),
         ]
 
+        self.common_repo.register_pgcs([1, 2, 3, 4, 5])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query(
@@ -155,6 +161,7 @@ def test_batch_query(self):
             model.Layer2CatalogObject(5, model.ICRSCatalogObject(ra=14, dec=14, e_ra=0.1, e_dec=0.1)),
         ]
 
+        self.common_repo.register_pgcs([1, 2, 3, 4, 5])
         self.layer2_repo.save_data(objects)
 
         actual = self.layer2_repo.query_batch(