feat(ops): add account switch metrics and trend

backend/internal/service/ops_metrics_collector.go

@@ -285,6 +285,11 @@ func (c *OpsMetricsCollector) collectAndPersist(ctx context.Context) error {
 		return fmt.Errorf("query error counts: %w", err)
 	}
 
+	accountSwitchCount, err := c.queryAccountSwitchCount(ctx, windowStart, windowEnd)
+	if err != nil {
+		return fmt.Errorf("query account switch counts: %w", err)
+	}
+
 	windowSeconds := windowEnd.Sub(windowStart).Seconds()
 	if windowSeconds <= 0 {
 		windowSeconds = 60
@@ -310,6 +315,7 @@ func (c *OpsMetricsCollector) collectAndPersist(ctx context.Context) error {
 		Upstream529Count:             upstream529,
 
 		TokenConsumed: tokenConsumed,
+		AccountSwitchCount: accountSwitchCount,
 		QPS:           float64Ptr(roundTo1DP(qps)),
 		TPS:           float64Ptr(roundTo1DP(tps)),
 
@@ -551,6 +557,27 @@ WHERE created_at >= $1 AND created_at < $2`
 	return errorTotal, businessLimited, errorSLA, upstreamExcl429529, upstream429, upstream529, nil
 }
 
+func (c *OpsMetricsCollector) queryAccountSwitchCount(ctx context.Context, start, end time.Time) (int64, error) {
+	q := `
+SELECT
+  COALESCE(SUM(CASE
+    WHEN ev->>'kind' IN ('failover', 'retry_exhausted_failover', 'failover_on_400') THEN 1
+    ELSE 0
+  END), 0) AS switch_count
+FROM ops_error_logs o
+CROSS JOIN LATERAL jsonb_array_elements(
+  COALESCE(NULLIF(o.upstream_errors, 'null'::jsonb), '[]'::jsonb)
+) AS ev
+WHERE o.created_at >= $1 AND o.created_at < $2
+  AND o.is_count_tokens = FALSE`
+
+	var count int64
+	if err := c.db.QueryRowContext(ctx, q, start, end).Scan(&count); err != nil {
+		return 0, err
+	}
+	return count, nil
+}
+
 type opsCollectedSystemStats struct {
 	cpuUsagePercent    *float64
 	memoryUsedMB       *int64

backend/internal/service/ops_port.go

@@ -162,6 +162,7 @@ type OpsInsertSystemMetricsInput struct {
 	Upstream529Count             int64
 
 	TokenConsumed int64
+	AccountSwitchCount int64
 
 	QPS *float64
 	TPS *float64
@@ -225,6 +226,7 @@ type OpsSystemMetricsSnapshot struct {
 
 	GoroutineCount        *int `json:"goroutine_count"`
 	ConcurrencyQueueDepth *int `json:"concurrency_queue_depth"`
+	AccountSwitchCount    *int64 `json:"account_switch_count"`
 }
 
 type OpsUpsertJobHeartbeatInput struct {

backend/internal/service/ops_trend_models.go

@@ -6,6 +6,7 @@ type OpsThroughputTrendPoint struct {
 	BucketStart   time.Time `json:"bucket_start"`
 	RequestCount  int64     `json:"request_count"`
 	TokenConsumed int64     `json:"token_consumed"`
+	SwitchCount   int64     `json:"switch_count"`
 	QPS           float64   `json:"qps"`
 	TPS           float64   `json:"tps"`
 }