Initial expense schema

examples/expense.json

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+{
+  "title": "Server rent",
+  "description": "Dedicated server: andromeda.kosmos.org, April 2020",
+  "currency": "EUR",
+  "amount": 39.00,
+  "date": "2020-05-06",
+  "url": "https://wiki.kosmos.org/Infrastructure#Hetzner",
+  "tags": ["infrastructure", "server", "hetzner"]
+}

schemas/expense.json

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "https://schema.kosmos.org/Expense",
+  "type": "object",
+  "title": "Expense",
+  "description": "Record of costs expended",
+  "default": {},
+  "required": [
+    "title",
+    "currency",
+    "amount"
+  ],
+  "additionalProperties": false,
+  "properties": {
+    "@context": {
+      "type": "string",
+      "enum": [ "https://schema.kosmos.org" ],
+      "default": "https://schema.kosmos.org"
+    },
+    "@type": {
+      "type": "string",
+      "enum": [ "Expense" ],
+      "default": "Expense"
+    },
+    "title": {
+      "type": "string",
+      "title": "Title",
+      "description": "A short description of the expense",
+      "default": "",
+      "examples": [
+        "Server rent"
+      ]
+    },
+    "description": {
+      "type": "string",
+      "title": "Description",
+      "description": "A longer description of the expense",
+      "default": "",
+      "examples": [
+        "Dedicated server: andromeda.kosmos.org"
+      ]
+    },
+    "currency": {
+      "type": "string",
+      "title": "Currency",
+      "description": "ISO 4217 (or other) code of the currency that the expense was paid with",
+      "default": "",
+      "examples": [
+        "EUR",
+        "USD",
+        "BTC"
+      ]
+    },
+    "amount": {
+      "type": "number",
+      "title": "Amount",
+      "description": "Expended amount of defined currency",
+      "default": 0,
+      "examples": [
+        42.0
+      ]
+    },
+    "date": {
+      "type": "string",
+      "format": "date",
+      "title": "Date",
+      "description": "Date of contribution (RFC 3339 full-date)"
+    },
+    "url": {
+      "type": "string",
+      "format": "uri",
+      "title": "URL",
+      "description": "A URL pointing to more information about the expense or related items",
+      "default": "",
+      "examples": [
+        "https://wiki.kosmos.org/Infrastructure#Hetzner"
+      ]
+    },
+    "tags": {
+      "type": "array",
+      "title": "Tags",
+      "description": "Tags for organizing, filtering, sorting, etc.",
+      "default": [],
+      "items": {
+        "$id": "#/properties/tags/items",
+        "anyOf": [
+          {
+            "$id": "#/properties/tags/items/anyOf/0",
+            "type": "string",
+            "title": "Tag",
+            "description": "A tag (lowercase dasherized)",
+            "default": "",
+            "examples": [
+              "infrastructure",
+              "server"
+            ]
+          }
+        ]
+      }
+    }
+  }
+}