Added additional SQLite option

modules/migrator_sqlite.py

@@ -0,0 +1,26 @@
+from os import rename
+from pathlib import Path
+from typing import Mapping
+
+from libbot.sync import json_read
+
+from modules.database_sqlite import cursor
+
+
+def migrate_database() -> None:
+    """Apply migrations from old JSON database to SQLite"""
+    if not Path("data/database.json").exists():
+        return
+
+    db_old: Mapping[str, Mapping[str, str]] = json_read(Path("data/database.json"))
+
+    for user, keys in db_old.items():
+        user_locale = None if "locale" not in keys else keys["locale"]
+        user_card = None if "card" not in keys else keys["card"]
+
+        cursor.execute(
+            "INSERT INTO users VALUES (?, ?)", (int(user), user_card, user_locale)
+        )
+
+    cursor.connection.commit()
+    rename(Path("data/database.json"), Path("data/database.migrated.json"))