diff --git a/rfd-api-spec.json b/rfd-api-spec.json
index 16eb427..03fc11c 100644
--- a/rfd-api-spec.json
+++ b/rfd-api-spec.json
@@ -2287,12 +2287,17 @@
             }
           },
           "head_commit": {
-            "$ref": "#/components/schemas/GitHubCommit"
+            "nullable": true,
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/GitHubCommit"
+              }
+            ]
           },
           "installation": {
             "$ref": "#/components/schemas/GitHubInstallation"
           },
-          "ref_": {
+          "ref": {
             "type": "string"
           },
           "repository": {
@@ -2304,9 +2309,8 @@
         },
         "required": [
           "commits",
-          "head_commit",
           "installation",
-          "ref_",
+          "ref",
           "repository",
           "sender"
         ]
diff --git a/rfd-api/src/main.rs b/rfd-api/src/main.rs
index 07e38f6..95b27d4 100644
--- a/rfd-api/src/main.rs
+++ b/rfd-api/src/main.rs
@@ -64,6 +64,8 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
         ServerLogFormat::Pretty => subscriber.pretty().init(),
     };
 
+    tracing::info!("Initialized logger");
+
     let mut context = ApiContext::new(
         config.public_url,
         Arc::new(
@@ -79,9 +81,13 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
     )
     .await?;
 
+    tracing::info!("Configured server context");
+
     let init_data = InitialData::new(config.initial_mappers.map(|p| vec![p]))?;
     init_data.initialize(&context).await?;
 
+    tracing::info!("Loaded initial data");
+
     if let Some(github) = config.authn.oauth.github {
         context.insert_oauth_provider(
             OAuthProviderName::GitHub,
@@ -93,7 +99,9 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
                     github.web.client_secret.clone(),
                 ))
             }),
-        )
+        );
+
+        tracing::info!("Added GitHub OAuth provider");
     }
 
     if let Some(google) = config.authn.oauth.google {
@@ -107,7 +115,9 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
                     google.web.client_secret.clone(),
                 ))
             }),
-        )
+        );
+
+        tracing::info!("Added Google OAuth provider");
     }
 
     tracing::debug!(?config.spec, "Spec configuration");