Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "checked_sources": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {},
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "count": {
+      "type": "number"
+    },
+    "ended": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {},
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "license_note": {
+      "type": "string"
+    },
+    "note": {
+      "type": "string"
+    },
+    "provenance": {
+      "description": "Freshness receipts for every upstream source used.",
+      "items": {
+        "additionalProperties": {},
+        "description": "Freshness receipt for one upstream source.",
+        "properties": {
+          "content_sha256": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "fetch_status": {
+            "description": "found / empty / stale / unavailable / unsupported (see catalog fetch_status_values).",
+            "enum": [
+              "found",
+              "empty",
+              "stale",
+              "unavailable",
+              "unsupported"
+            ],
+            "type": "string"
+          },
+          "parser_version": {
+            "type": "string"
+          },
+          "processed_by": {
+            "type": "string"
+          },
+          "retrieved_at": {
+            "description": "When this service retrieved the upstream data (null if unknown).",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "source": {
+            "additionalProperties": {},
+            "description": "Publisher and URL of the upstream document or dataset.",
+            "properties": {
+              "publisher": {
+                "type": "string"
+              },
+              "url": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "publisher",
+              "url"
+            ],
+            "type": "object"
+          },
+          "upstream_updated_at": {
+            "description": "Update time stated by the upstream, or null when it states none.",
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "source",
+          "upstream_updated_at",
+          "retrieved_at",
+          "content_sha256",
+          "parser_version",
+          "fetch_status",
+          "processed_by"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "responded_at": {
+      "type": "string"
+    },
+    "retrieved_at": {
+      "description": "When the upstream data was retrieved (ISO 8601).",
+      "type": "string"
+    },
+    "source": {
+      "description": "Data source and processor.",
+      "type": "string"
+    },
+    "status": {
+      "description": "listed = JMA is issuing typhoon bulletins; none_in_checked_sources = none in the checked feeds; partial/unknown = some or all could not be checked.",
+      "enum": [
+        "listed",
+        "none_in_checked_sources",
+        "partial",
+        "unknown"
+      ],
+      "type": "string"
+    },
+    "terms": {
+      "description": "URL of the terms of service.",
+      "type": "string"
+    },
+    "typhoons": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "issued_at": {
+            "type": "string"
+          },
+          "slot": {
+            "type": "string"
+          },
+          "source_url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "slot",
+          "issued_at",
+          "source_url"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "unchecked": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "reason": {
+            "type": "string"
+          },
+          "slot": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "slot",
+          "reason"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "status",
+    "count",
+    "typhoons",
+    "ended",
+    "unchecked",
+    "checked_sources",
+    "note",
+    "provenance",
+    "source",
+    "retrieved_at",
+    "responded_at",
+    "license_note",
+    "terms"
+  ],
+  "type": "object"
+}