fix: remove cost calculation from dograh codebase

api/services/workflow/run_usage_response.py

@@ -0,0 +1,41 @@
+"""Format workflow run usage for public API responses."""
+
+
+def format_public_usage_info(usage_info: dict | None) -> dict | None:
+    if not usage_info:
+        return None
+
+    return {
+        "llm": usage_info.get("llm") or {},
+        "tts": usage_info.get("tts") or {},
+        "stt": usage_info.get("stt") or {},
+        "call_duration_seconds": usage_info.get("call_duration_seconds"),
+    }
+
+
+def format_public_cost_info(
+    cost_info: dict | None, usage_info: dict | None
+) -> dict | None:
+    """Return the legacy response shape without doing local cost accounting."""
+    duration = None
+    if usage_info and usage_info.get("call_duration_seconds") is not None:
+        duration = int(round(usage_info.get("call_duration_seconds") or 0))
+    elif cost_info and cost_info.get("call_duration_seconds") is not None:
+        duration = int(round(cost_info.get("call_duration_seconds") or 0))
+
+    dograh_token_usage = 0
+    if cost_info:
+        if "dograh_token_usage" in cost_info:
+            dograh_token_usage = cost_info.get("dograh_token_usage") or 0
+        elif "total_cost_usd" in cost_info:
+            dograh_token_usage = round(
+                float(cost_info.get("total_cost_usd", 0)) * 100, 2
+            )
+
+    if duration is None and dograh_token_usage == 0:
+        return None
+
+    return {
+        "dograh_token_usage": dograh_token_usage,
+        "call_duration_seconds": duration,
+    }