Use JSON for sqlite state

src/py/flwr/server/superlink/state/sqlite_state.py

@@ -15,10 +15,10 @@
 """SQLite based implemenation of server state."""
 
 
+import json
 import re
 import sqlite3
 import time
-from ast import literal_eval
 from logging import DEBUG, ERROR
 from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Union, cast
 from uuid import UUID, uuid4
@@ -633,7 +633,9 @@ def create_run(
                 "INSERT INTO run (run_id, fab_id, fab_version, override_config)"
                 "VALUES (?, ?, ?, ?);"
             )
-            self.query(query, (run_id, fab_id, fab_version, str(override_config)))
+            self.query(
+                query, (run_id, fab_id, fab_version, json.dumps(override_config))
+            )
             return run_id
         log(ERROR, "Unexpected run creation failure.")
         return 0
@@ -700,7 +702,7 @@ def get_run(self, run_id: int) -> Optional[Run]:
                 run_id=run_id,
                 fab_id=row["fab_id"],
                 fab_version=row["fab_version"],
-                override_config=literal_eval(row["override_config"]),
+                override_config=json.loads(row["override_config"]),
             )
         except sqlite3.IntegrityError:
             log(ERROR, "`run_id` does not exist.")