diff --git a/backend/internal/service/ops_models.go b/backend/internal/service/ops_models.go
index 2ed06d90..5fefb74f 100644
--- a/backend/internal/service/ops_models.go
+++ b/backend/internal/service/ops_models.go
@@ -62,6 +62,12 @@ type OpsErrorLog struct {
 	ClientIP    *string `json:"client_ip"`
 	RequestPath string  `json:"request_path"`
 	Stream      bool    `json:"stream"`
+
+	InboundEndpoint  string `json:"inbound_endpoint"`
+	UpstreamEndpoint string `json:"upstream_endpoint"`
+	RequestedModel   string `json:"requested_model"`
+	UpstreamModel    string `json:"upstream_model"`
+	RequestType      *int16 `json:"request_type"`
 }
 
 type OpsErrorLogDetail struct {
diff --git a/backend/internal/service/ops_port.go b/backend/internal/service/ops_port.go
index 0ce9d425..04bf91c8 100644
--- a/backend/internal/service/ops_port.go
+++ b/backend/internal/service/ops_port.go
@@ -79,6 +79,17 @@ type OpsInsertErrorLogInput struct {
 	Model       string
 	RequestPath string
 	Stream      bool
+	// InboundEndpoint is the normalized client-facing API endpoint path, e.g. /v1/chat/completions.
+	InboundEndpoint string
+	// UpstreamEndpoint is the normalized upstream endpoint path, e.g. /v1/responses.
+	UpstreamEndpoint string
+	// RequestedModel is the client-requested model name before mapping.
+	RequestedModel string
+	// UpstreamModel is the actual model sent to upstream after mapping. Empty means no mapping.
+	UpstreamModel string
+	// RequestType is the granular request type: 0=unknown, 1=sync, 2=stream, 3=ws_v2.
+	// Matches service.RequestType enum semantics from usage_log.go.
+	RequestType *int16
 	UserAgent   string
 
 	ErrorPhase        string
diff --git a/backend/internal/service/ops_upstream_context.go b/backend/internal/service/ops_upstream_context.go
index 9adf5896..05d444e1 100644
--- a/backend/internal/service/ops_upstream_context.go
+++ b/backend/internal/service/ops_upstream_context.go
@@ -93,6 +93,10 @@ type OpsUpstreamErrorEvent struct {
 	UpstreamStatusCode int    `json:"upstream_status_code,omitempty"`
 	UpstreamRequestID  string `json:"upstream_request_id,omitempty"`
 
+	// UpstreamURL is the actual upstream URL that was called (host + path, query/fragment stripped).
+	// Helps debug 404/routing errors by showing which endpoint was targeted.
+	UpstreamURL string `json:"upstream_url,omitempty"`
+
 	// Best-effort upstream request capture (sanitized+trimmed).
 	// Required for retrying a specific upstream attempt.
 	UpstreamRequestBody string `json:"upstream_request_body,omitempty"`
@@ -119,6 +123,7 @@ func appendOpsUpstreamError(c *gin.Context, ev OpsUpstreamErrorEvent) {
 	ev.UpstreamRequestBody = strings.TrimSpace(ev.UpstreamRequestBody)
 	ev.UpstreamResponseBody = strings.TrimSpace(ev.UpstreamResponseBody)
 	ev.Kind = strings.TrimSpace(ev.Kind)
+	ev.UpstreamURL = strings.TrimSpace(ev.UpstreamURL)
 	ev.Message = strings.TrimSpace(ev.Message)
 	ev.Detail = strings.TrimSpace(ev.Detail)
 	if ev.Message != "" {
@@ -205,3 +210,19 @@ func ParseOpsUpstreamErrors(raw string) ([]*OpsUpstreamErrorEvent, error) {
 	}
 	return out, nil
 }
+
+// safeUpstreamURL returns scheme + host + path from a URL, stripping query/fragment
+// to avoid leaking sensitive query parameters (e.g. OAuth tokens).
+func safeUpstreamURL(rawURL string) string {
+	rawURL = strings.TrimSpace(rawURL)
+	if rawURL == "" {
+		return ""
+	}
+	if idx := strings.IndexByte(rawURL, '?'); idx >= 0 {
+		rawURL = rawURL[:idx]
+	}
+	if idx := strings.IndexByte(rawURL, '#'); idx >= 0 {
+		rawURL = rawURL[:idx]
+	}
+	return rawURL
+}
diff --git a/backend/migrations/079_ops_error_logs_add_endpoint_fields.sql b/backend/migrations/079_ops_error_logs_add_endpoint_fields.sql
new file mode 100644
index 00000000..56f83b84
--- /dev/null
+++ b/backend/migrations/079_ops_error_logs_add_endpoint_fields.sql
@@ -0,0 +1,28 @@
+-- Ops error logs: add endpoint, model mapping, and request_type fields
+-- to match usage_logs observability coverage.
+--
+-- All columns are nullable with no default to preserve backward compatibility
+-- with existing rows.
+
+SET LOCAL lock_timeout = '5s';
+SET LOCAL statement_timeout = '10min';
+
+-- 1) Standardized endpoint paths (analogous to usage_logs.inbound_endpoint / upstream_endpoint)
+ALTER TABLE ops_error_logs
+    ADD COLUMN IF NOT EXISTS inbound_endpoint VARCHAR(256),
+    ADD COLUMN IF NOT EXISTS upstream_endpoint VARCHAR(256);
+
+-- 2) Model mapping fields (analogous to usage_logs.requested_model / upstream_model)
+ALTER TABLE ops_error_logs
+    ADD COLUMN IF NOT EXISTS requested_model VARCHAR(100),
+    ADD COLUMN IF NOT EXISTS upstream_model VARCHAR(100);
+
+-- 3) Granular request type enum (analogous to usage_logs.request_type: 0=unknown, 1=sync, 2=stream, 3=ws_v2)
+ALTER TABLE ops_error_logs
+    ADD COLUMN IF NOT EXISTS request_type SMALLINT;
+
+COMMENT ON COLUMN ops_error_logs.inbound_endpoint IS 'Normalized client-facing API endpoint path, e.g. /v1/chat/completions. Populated from InboundEndpointMiddleware.';
+COMMENT ON COLUMN ops_error_logs.upstream_endpoint IS 'Normalized upstream endpoint path derived from platform, e.g. /v1/responses.';
+COMMENT ON COLUMN ops_error_logs.requested_model IS 'Client-requested model name before mapping (raw from request body).';
+COMMENT ON COLUMN ops_error_logs.upstream_model IS 'Actual model sent to upstream provider after mapping. NULL means no mapping applied.';
+COMMENT ON COLUMN ops_error_logs.request_type IS 'Request type enum: 0=unknown, 1=sync, 2=stream, 3=ws_v2. Matches usage_logs.request_type semantics.';