Added value: +{
+  "description": "Setup scripts of the databases of runnable code blocks (shown to the author only).",
+  "properties": {
+    "mongodb": {
+      "type": "string"
+    },
+    "redis": {
+      "type": "string"
+    },
+    "sql": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Previous value: -nullNew value: +{
+  "properties": {
+    "access": {
+      "description": "open, public or private.",
+      "type": "string"
+    },
+    "can_edit": {
+      "description": "Whether you may change it.",
+      "type": "boolean"
+    },
+    "description": {
+      "type": "string"
+    },
+    "id": {
+      "type": "integer"
+    },
+    "owner": {
+      "description": "User name of the author.",
+      "type": "string"
+    },
+    "slides": {
+      "items": {
+        "properties": {
+          "background": {
+            "description": "The \"src\" of the background picture, or null.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "bg": {
+            "type": "string"
+          },
+          "fit": {
+            "type": "string"
+          },
+          "h": {
+            "type": "integer"
+          },
+          "id": {
+            "description": "Stable id of the slide.",
+            "type": "integer"
+          },
+          "name": {
+            "type": "string"
+          },
+          "number": {
+            "description": "1-based position; changes when slides are reordered.",
+            "type": "integer"
+          },
+          "objects": {
+            "description": "Blocks, bottom to top.",
+            "items": {
+              "properties": {
+                "id": {
+                  "type": "integer"
+                },
+                "props": {
+                  "description": "Every prop of the block (see the block format reference).",
+                  "type": "object"
+                },
+                "type": {
+                  "description": "text, shape, button, line, image or code.",
+                  "type": "string"
+                }
+              },
+              "required": [
+                "id",
+                "type",
+                "props"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "url": {
+            "description": "The address people open in a browser.",
+            "type": "string"
+          },
+          "w": {
+            "type": "integer"
+          }
+        },
+        "required": [
+          "id",
+          "number",
+          "objects"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "slug": {
+      "description": "The address of the presentation: /movie/<slug>/.",
+      "type": "string"
+    },
+    "theme": {
+      "type": "string"
+    },
+    "title": {
+      "type": "string"
+    },
+    "url": {
+      "description": "The address people open in a browser.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "id",
+    "slug",
+    "title",
+    "slides"
+  ],
+  "type": "object"
+}