diff --git a/master/buildbot/scripts/copydb.py b/master/buildbot/scripts/copydb.py
index 62232538380..accd1a32612 100644
--- a/master/buildbot/scripts/copydb.py
+++ b/master/buildbot/scripts/copydb.py
@@ -101,7 +101,6 @@ async def _copy_single_table(
     column_keys = table.columns.keys()
 
     rows_queue = queue.Queue(32)
-    written_count = [0]
     total_count = [0]
 
     autoincrement_foreign_key_column = None
@@ -109,60 +108,51 @@ async def _copy_single_table(
         if not column.foreign_keys and column.primary_key and isinstance(column.type, sa.Integer):
             autoincrement_foreign_key_column = column_name
 
-    def thd_write(conn):
+    def thd_write(conn: sa.Connection) -> None:
+        written_count = 0
         max_column_id = 0
-        while True:
-            try:
-                rows = rows_queue.get(timeout=1)
-                if rows is None:
-                    if autoincrement_foreign_key_column is not None and max_column_id != 0:
-                        if dst_db.pool.engine.dialect.name == 'postgresql':
-                            # Explicitly inserting primary row IDs does not bump the primary key
-                            # sequence on Postgres
-                            seq_name = f"{table_name}_{autoincrement_foreign_key_column}_seq"
-                            transaction = conn.begin()
-                            conn.execute(
-                                f"ALTER SEQUENCE {seq_name} RESTART WITH {max_column_id + 1}"
-                            )
-                            transaction.commit()
-
-                    rows_queue.task_done()
-                    return
-
-                row_dicts = [{k: getattr(row, k) for k in column_keys} for row in rows]
-
-                if autoincrement_foreign_key_column is not None:
-                    for row in row_dicts:
-                        max_column_id = max(max_column_id, row[autoincrement_foreign_key_column])
-
-                if table_name == "buildsets":
-                    for row_dict in row_dicts:
-                        if row_dict["parent_buildid"] is not None:
-                            buildset_to_parent_buildid.append((
-                                row_dict["id"],
-                                row_dict["parent_buildid"],
-                            ))
-                        row_dict["parent_buildid"] = None
-
-            except queue.Empty:
-                continue
+        while (rows := rows_queue.get()) is not None:
+            row_dicts = [{k: getattr(row, k) for k in column_keys} for row in rows]
+
+            if autoincrement_foreign_key_column is not None:
+                for row in row_dicts:
+                    max_column_id = max(max_column_id, row[autoincrement_foreign_key_column])
+
+            if table_name == "buildsets":
+                for row_dict in row_dicts:
+                    if row_dict["parent_buildid"] is not None:
+                        buildset_to_parent_buildid.append((
+                            row_dict["id"],
+                            row_dict["parent_buildid"],
+                        ))
+                    row_dict["parent_buildid"] = None
 
-            try:
-                written_count[0] += len(rows)
-                print_log(
-                    f"Copying {len(rows)} items ({written_count[0]}/{total_count[0]}) "
-                    f"for {table_name} table"
-                )
+            written_count += len(rows)
+            print_log(
+                f"Copying {len(rows)} items ({written_count}/{total_count[0]}) "
+                f"for {table_name} table"
+            )
 
+            try:
                 if len(row_dicts) > 0:
                     conn.execute(table.insert(), row_dicts)
-
             finally:
                 rows_queue.task_done()
 
-    def thd_read(conn):
+        if autoincrement_foreign_key_column is not None and max_column_id != 0:
+            if dst_db.pool.engine.dialect.name == 'postgresql':
+                # Explicitly inserting primary row IDs does not bump the primary key
+                # sequence on Postgres
+                seq_name = f"{table_name}_{autoincrement_foreign_key_column}_seq"
+                conn.exec_driver_sql(f"ALTER SEQUENCE {seq_name} RESTART WITH {max_column_id + 1}")
+
+        rows_queue.task_done()
+
+    def thd_read(conn: sa.Connection) -> None:
         q = sa.select(sa.sql.func.count()).select_from(table)
-        total_count[0] = conn.execute(q).scalar()
+        count = conn.execute(q).scalar()
+        assert count is not None
+        total_count[0] = count
 
         result = conn.execute(sa.select(table))
         while chunk := result.fetchmany(10000):
@@ -171,7 +161,7 @@ def thd_read(conn):
         rows_queue.put(None)
 
     read_task = src_db.pool.do(thd_read)
-    write_task = dst_db.pool.do(thd_write)
+    write_task = dst_db.pool.do_with_transaction(thd_write)
 
     await write_task
     await read_task