feat: implement task queue statistics and add UI templates for job management and visualization.

internal/db/tasks.go

@@ -7,6 +7,32 @@ import (
 	"log"
 )
 
+// QueueStats holds task queue counters
+type QueueStats struct {
+	Pending   int `json:"pending"`
+	Running   int `json:"running"`
+	Failed    int `json:"failed"`
+	Completed int `json:"completed"`
+}
+
+// GetQueueStats returns counts for each task status
+func (db *DB) GetQueueStats() (*QueueStats, error) {
+	query := `
+	SELECT
+		COALESCE(SUM(CASE WHEN status = 'PENDING' THEN 1 ELSE 0 END), 0),
+		COALESCE(SUM(CASE WHEN status = 'RUNNING' THEN 1 ELSE 0 END), 0),
+		COALESCE(SUM(CASE WHEN status = 'FAILED' THEN 1 ELSE 0 END), 0),
+		COALESCE(SUM(CASE WHEN status = 'COMPLETED' THEN 1 ELSE 0 END), 0)
+	FROM tasks
+	`
+	var stats QueueStats
+	err := db.QueryRow(query).Scan(&stats.Pending, &stats.Running, &stats.Failed, &stats.Completed)
+	if err != nil {
+		return nil, err
+	}
+	return &stats, nil
+}
+
 // EnqueueTask adds a new task to the queue
 func (db *DB) EnqueueTask(taskType string, payload interface{}) error {
 	payloadBytes, err := json.Marshal(payload)