Add metadata field to Activities

Author: moehreag

docs/api_documentation.md

@@ -105,6 +105,12 @@ See [Gateway](#gateway)
 - `title`: `string`
 - `description`: `string`
 - `started`: `Timestamp`
+- `metadata`: `Metadata?`
+
+##### Metadata
+
+- `type`: `string`
+- `attributes`: opaque json object with additional attributes for this activity
 
 #### Errors
 

src/endpoints/user.rs

@@ -7,6 +7,7 @@ use chrono::{DateTime, Utc};
 use log::warn;
 use reqwest::StatusCode;
 use serde::{Deserialize, Serialize};
+use serde_json::Value;
 use sqlx::{query, query_scalar, Type};
 use uuid::Uuid;
 
@@ -46,6 +47,8 @@ pub struct Activity {
 	title: String,
 	description: String,
 	started: DateTime<Utc>,
+	#[serde(skip_serializing_if = "Value::is_null", default)]
+	metadata: Value,
 }
 
 #[derive(Deserialize, Serialize, Type)]