diff --git a/CHANGELOG.md b/CHANGELOG.md
index 413a642..38c8121 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+# 0.3.0
+
+- `service.name` must be sent vs `service_name` now for consistency
+- a `PATCH` to update the `ttl` will extend from the current span duration. e.g. patching 10000 to a span that has been running for 34125ms will set the ttl to 44125
+- added `test.sh` to run through the operations and expiration behaviour
+
+# 0.2.1
+
+- API changed to use HTTP verbs for crud
+
 # 0.1.0
 
 - First release
diff --git a/Cargo.lock b/Cargo.lock
index 91dbf97..71599f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1317,7 +1317,7 @@ dependencies = [
 
 [[package]]
 name = "testevents"
-version = "0.2.1"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "axum",
diff --git a/Cargo.toml b/Cargo.toml
index b5d4180..9672655 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "testevents"
-version = "0.2.1"
+version = "0.3.0"
 edition = "2021"
 authors = ["Jeremy Blythe <jeremyblythe@gmail.com>"]
 repository = "https://github.com/jerbly/testevents"
diff --git a/README.md b/README.md
index 09b6fdf..196e408 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ A service to make it easier to create Honeycomb spans in some restricted environ
 
 Spans are "closed" with a `DELETE` to `/{trace_id}/{span_id}/` - this creates the Honeycomb event with a calculated `duration_ms` from the "open" call.
 
-`PATCH` to `/{trace_id}/{span_id}/` can be used to merge a set of key-values into the "open" span. Existing keys will have their values overwritten. You can change the `ttl` to extend or shorten the time to expiry.
+`PATCH` to `/{trace_id}/{span_id}/` can be used to merge a set of key-values into the "open" span. Existing keys will have their values overwritten. You can change the `ttl` to extend or shorten the time to expiry. e.g. patching 10000 to a span that has been running for 34125ms will set the ttl to 44125.
 
 ## Installing
 
@@ -41,7 +41,7 @@ Make a root span:
 curl -i -X POST \
   'http://127.0.0.1:3003/' \                                                        
   -H 'Content-Type: application/json' \
-  -d '{"service_name":"jerbly-test",
+  -d '{"service.name":"jerbly-test",
        "name":"test",
        "hello":"world",     
        "ttl":600000}'
@@ -60,7 +60,7 @@ Make a child span:
 curl -i -X POST \
   'http://127.0.0.1:3003/4c278c122e123f87036b44772861b9f4/5370f70191c4b03c/' \
   -H 'Content-Type: application/json' \
-  -d '{"service_name":"jerbly-test",
+  -d '{"service.name":"jerbly-test",
        "name":"test_child", 
        "hello":"child span",
        "ttl":600000}'
diff --git a/src/main.rs b/src/main.rs
index 3a3cc9f..c956fb6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -65,6 +65,7 @@ async fn main() -> anyhow::Result<()> {
     // run it
     let bind_port = std::env::var("TESTEVENTS_PORT").unwrap_or("3003".to_string());
     let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{bind_port}")).await?;
+    println!("testevents version: {}", env!("CARGO_PKG_VERSION"));
     println!("listening on {}", listener.local_addr()?);
     axum::serve(listener, app).await?;
 
diff --git a/src/span_store.rs b/src/span_store.rs
index 80a025b..4e1fcfb 100644
--- a/src/span_store.rs
+++ b/src/span_store.rs
@@ -113,13 +113,20 @@ impl SpanAttributes {
                     .unwrap_or_default()
                     .clone_into(&mut self.service_name),
                 "status_code" => self.status_code = value.as_i64().unwrap_or_default(),
-                "ttl" => self.ttl = value.as_i64().unwrap_or_default(),
+                "ttl" => self.set_ttl(value.as_i64().unwrap_or_default()),
                 _ => {
                     self.extra.insert(key, value);
                 }
             }
         }
     }
+
+    fn set_ttl(&mut self, ttl: i64) {
+        // set a new ttl which is millis from timestamp + incoming ttl
+        let now = Utc::now().timestamp_millis();
+        let current_used_millis = now - self.timestamp.timestamp_millis();
+        self.ttl = current_used_millis + ttl;
+    }
 }
 
 #[derive(Debug, Serialize, Clone)]
@@ -159,6 +166,7 @@ impl SpanAttributes {
 
 #[derive(Deserialize, Debug)]
 pub struct QueryAttributes {
+    #[serde(rename = "service.name")]
     service_name: String,
     name: String,
     ttl: Option<i64>,
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..17aef66
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+url="http://localhost:3003"
+
+echo "Make a root span"
+response=$(curl -s -X POST $url/ -H 'Content-Type: application/json' -d '{"service.name":"jerbly-test","name":"test","hello":"world","ttl":3600000}')
+root_span_id=$(echo $response | jq -r '.span_id')
+root_trace_id=$(echo $response | jq -r '.trace_id')
+sleep 1
+
+echo "Make a child span"
+response=$(curl -s -X POST $url/$root_trace_id/$root_span_id/ -H 'Content-Type: application/json' -d '{"service.name":"jerbly-test","name":"child","ttl":3600000}')
+span_id=$(echo $response | jq -r '.span_id')
+sleep 1
+
+echo "Patch the child span with a new value and a shorter ttl - and let it timeout"
+curl -s -X PATCH $url/$root_trace_id/$span_id/ -H 'Content-Type: application/json' -d '{"new":true,"ttl":1000}'
+sleep 2
+
+echo ""
+echo "Check for a 404 on an attempt to DELETE the expired child span"
+response=$(curl -s -o /dev/null -w "%{http_code}" -X DELETE $url/$root_trace_id/$span_id/)
+echo "Status code: $response"
+
+echo "Close the root span"
+curl -s -X DELETE $url/$root_trace_id/$root_span_id/