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app/core/usage_tracker.py

@@ -607,8 +607,8 @@ class UsageTracker:
                         processing_ms, idempotency_key)
                        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                     (record.api_key, record.tier.value, record.timestamp, record.endpoint,
-                     json.dumps(record.request_body) if record.request_body else None,
-                     json.dumps(record.response) if record.response else None,
+                     json.dumps(record.request_body, default=str) if record.request_body else None,
+                     json.dumps(record.response, default=str) if record.response else None,
                      record.error, record.processing_ms, idempotency_key)
                 )
                 conn.commit()
@@ -644,8 +644,8 @@ class UsageTracker:
                         processing_ms, idempotency_key)
                        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                     (record.api_key, tier_value, record.timestamp, record.endpoint,
-                     json.dumps(record.request_body) if record.request_body else None,
-                     json.dumps(record.response) if record.response else None,
+                     json.dumps(record.request_body, default=str) if record.request_body else None,
+                     json.dumps(record.response, default=str) if record.response else None,
                      record.error, record.processing_ms, None)
                 )
                 conn.commit()

tests/test_usage_tracker.py

@@ -1,5 +1,6 @@
 import json
 import os
+from datetime import datetime
 
 import psycopg2
 import pytest
@@ -177,3 +178,31 @@ def test_insert_audit_log_writes_response_row(tracker):
     assert logs[0]["endpoint"] == "/api/v1/intents/evaluate/response"
     assert logs[0]["tier"] == "unknown"
     assert json.loads(logs[0]["response"]) == {"recommended_action": "approve"}
+
+
+def test_consume_quota_and_log_handles_non_json_native_request_body(tracker):
+    """request_body/response are whatever a Pydantic model's plain
+    .model_dump() returns, e.g. ReliabilityEvent.timestamp in
+    app/api/routes_governance.py's HealingDecisionRequest -- a raw
+    datetime, not the ISO string model_dump(mode="json") would produce.
+    json.dumps has no default encoder for datetime, so any real request
+    carrying one raised TypeError here, outside any try/except in the
+    /healing/evaluate handler, on every call (surfaced while verifying the
+    tier=None fix for that same endpoint: fixing tier alone still crashed,
+    one layer deeper, on this). default=str makes the insert tolerant of
+    datetime and any other type json.dumps doesn't natively handle."""
+    tracker.get_or_create_api_key("datetime-body-key", tenant_id="test")
+    record = UsageRecord(
+        api_key="datetime-body-key",
+        tier=Tier.FREE,
+        timestamp=time.time(),
+        endpoint="/api/v1/healing/evaluate",
+        request_body={"event": {"component": "svc", "timestamp": datetime.now()}},
+    )
+
+    result = tracker.increment_usage_sync(record)
+    assert result is True
+
+    logs = tracker.get_audit_logs("datetime-body-key", limit=10)
+    assert len(logs) == 1
+    assert "timestamp" in json.loads(logs[0]["request_body"])["event"]