Fix heartbeats insertion.

Add OS and editor fields.
Introduce aggregations (not working yet).

services/aggregation.go

@@ -0,0 +1,29 @@
+package services
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/n1try/wakapi/models"
+)
+
+type AggregationService struct {
+	Db               *sql.DB
+	HeartbeatService *HeartbeatService
+}
+
+func (srv *AggregationService) Aggregate(from time.Time, to time.Time, user *models.User) {
+	heartbeats, err := srv.HeartbeatService.GetAllFrom(from, user)
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, h := range heartbeats {
+		fmt.Printf("%+v\n", h)
+	}
+}
+
+func (srv *AggregationService) aggregateBy(*[]models.Heartbeat, models.AggregationType) *models.Aggregation {
+	return &models.Aggregation{}
+}