Updated default values, added new init. migration

src/migrations/.snapshot-game.json

@@ -21,6 +21,7 @@
           "primary": false,
           "nullable": false,
           "length": 255,
+          "default": "''",
           "mappedType": "string"
         },
         "width": {
@@ -51,7 +52,7 @@
           "unsigned": false,
           "autoincrement": false,
           "primary": false,
-          "nullable": true,
+          "nullable": false,
           "length": null,
           "mappedType": "json"
         },
@@ -233,6 +234,7 @@
           "primary": false,
           "nullable": false,
           "length": null,
+          "default": "0",
           "mappedType": "integer"
         },
         "position_y": {
@@ -243,6 +245,7 @@
           "primary": false,
           "nullable": false,
           "length": null,
+          "default": "0",
           "mappedType": "integer"
         },
         "teleport_id": {