feat: implement reasoning_tokens tracking and enhanced usage logging

src/logging/mod.rs

@@ -15,6 +15,7 @@ pub struct RequestLog {
     pub model: String,
     pub prompt_tokens: u32,
     pub completion_tokens: u32,
+    pub reasoning_tokens: u32,
     pub total_tokens: u32,
     pub cache_read_tokens: u32,
     pub cache_write_tokens: u32,
@@ -77,8 +78,8 @@ impl RequestLogger {
         sqlx::query(
             r#"
             INSERT INTO llm_requests 
-            (timestamp, client_id, provider, model, prompt_tokens, completion_tokens, total_tokens, cache_read_tokens, cache_write_tokens, cost, has_images, status, error_message, duration_ms, request_body, response_body)
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            (timestamp, client_id, provider, model, prompt_tokens, completion_tokens, reasoning_tokens, total_tokens, cache_read_tokens, cache_write_tokens, cost, has_images, status, error_message, duration_ms, request_body, response_body)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             "#,
         )
         .bind(log.timestamp)
@@ -87,6 +88,7 @@ impl RequestLogger {
         .bind(&log.model)
         .bind(log.prompt_tokens as i64)
         .bind(log.completion_tokens as i64)
+        .bind(log.reasoning_tokens as i64)
         .bind(log.total_tokens as i64)
         .bind(log.cache_read_tokens as i64)
         .bind(log.cache_write_tokens as i64)