[Postgres] Update styles to match new layer name when layer is renamed

src/providers/postgres/qgspostgresdataitemguiprovider.cpp

@@ -620,6 +620,15 @@ void QgsPostgresDataItemGuiProvider::renameLayer( QgsPGLayerItem *layerItem, Qgs
 
   notify( tr( "Rename %1" ).arg( typeName ), tr( "%1 '%2' renamed correctly to '%3'." ).arg( typeName, oldName, newName ), context, Qgis::MessageLevel::Success );
 
+  const QString updateStylesSql = u"UPDATE public.layer_styles SET f_table_name=%1 WHERE f_table_schema=%2 AND f_table_name=%3"_s
+                                    .arg( QgsPostgresConn::quotedValue( dlg.name() ), QgsPostgresConn::quotedValue( schemaName ), QgsPostgresConn::quotedValue( tableName ) );
+
+  QgsPostgresResult stylesResult( conn->LoggedPQexec( "QgsPostgresDataItemGuiProvider", updateStylesSql ) );
+  if ( stylesResult.PQresultStatus() != PGRES_COMMAND_OK )
+  {
+    notify( tr( "Rename %1" ).arg( typeName ), tr( "Unable to update layer styles for '%1'.\n%2" ).arg( dlg.name(), stylesResult.PQresultErrorMessage() ), context, Qgis::MessageLevel::Warning );
+  }
+
   conn->unref();
 
   if ( layerItem->parent() )

src/providers/postgres/qgspostgresproviderconnection.cpp

@@ -215,6 +215,8 @@ void QgsPostgresProviderConnection::dropRasterTable( const QString &schema, cons
 void QgsPostgresProviderConnection::renameTablePrivate( const QString &schema, const QString &name, const QString &newName ) const
 {
   executeSqlPrivate( u"ALTER TABLE %1.%2 RENAME TO %3"_s.arg( QgsPostgresConn::quotedIdentifier( schema ), QgsPostgresConn::quotedIdentifier( name ), QgsPostgresConn::quotedIdentifier( newName ) ) );
+  executeSqlPrivate( u"UPDATE public.layer_styles SET f_table_name=%1 WHERE f_table_schema=%2 AND f_table_name=%3"_s
+                       .arg( QgsPostgresConn::quotedValue( newName ), QgsPostgresConn::quotedValue( schema ), QgsPostgresConn::quotedValue( name ) ) );
 }
 
 QList<QgsAbstractDatabaseProviderConnection::TableProperty> QgsPostgresProviderConnection::tablesPrivate( const QString &schema, const QString &table, const TableFlags &flags, QgsFeedback *feedback ) const

tests/src/python/test_qgsproviderconnection_postgres.py

@@ -1103,6 +1103,57 @@ def test_move_raster_with_overviews_to_schema(self):
             tables,
         )
 
+    def test_rename_table_updates_layer_styles(self):
+        """Test that renaming a table also updates f_table_name in layer_styles."""
+        md = QgsProviderRegistry.instance().providerMetadata("postgres")
+        conn = md.createConnection(self.uri, {})
+
+        conn.executeSql(
+            """
+            DROP TABLE IF EXISTS qgis_test.rename_style_test CASCADE;
+            CREATE TABLE qgis_test.rename_style_test (id SERIAL PRIMARY KEY, geom geometry(POINT,4326));
+            INSERT INTO qgis_test.rename_style_test (geom) VALUES (ST_GeomFromText('POINT(0 0)', 4326));
+            """
+        )
+
+        vl = QgsVectorLayer(
+            conn.tableUri("qgis_test", "rename_style_test"),
+            "test_rename_with_style",
+            "postgres",
+        )
+        self.assertTrue(vl.isValid())
+        err = vl.saveStyleToDatabase("test_style", "", False, "")
+        self.assertFalse(err)
+
+        # Verify style was saved under the original name
+        rows = conn.executeSql(
+            "SELECT f_table_name FROM public.layer_styles "
+            "WHERE f_table_schema = 'qgis_test' AND f_table_name = 'rename_style_test'"
+        )
+        self.assertEqual(len(rows), 1)
+
+        conn.renameVectorTable(
+            "qgis_test", "rename_style_test", "rename_style_test_renamed"
+        )
+
+        # Style must now reference the new table name
+        rows = conn.executeSql(
+            "SELECT f_table_name FROM public.layer_styles "
+            "WHERE f_table_schema = 'qgis_test' AND f_table_name = 'rename_style_test_renamed'"
+        )
+        self.assertEqual(len(rows), 1)
+
+        # No stale row for the old name
+        rows = conn.executeSql(
+            "SELECT f_table_name FROM public.layer_styles "
+            "WHERE f_table_schema = 'qgis_test' AND f_table_name = 'rename_style_test'"
+        )
+        self.assertEqual(len(rows), 0)
+
+        conn.executeSql(
+            "DROP TABLE IF EXISTS qgis_test.rename_style_test_renamed CASCADE"
+        )
+
 
 if __name__ == "__main__":
     unittest.main()