updates

internal/assignment/crm_assignment.go

@@ -4,6 +4,9 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"os"
+	"strconv"
+	"strings"
 	"time"
 
 	"doormile/constants"
@@ -21,9 +24,28 @@ const (
 	retryDelay  = 2 * time.Minute
 	geoRadiusKm = 10.0
 	geoMaxCount = 10
-	maxActive   = 3
+
+	// defaultMaxActive is how many open stops one miler may hold at once.
+	// Override with MILER_MAX_ACTIVE_BOOKINGS — how many parcels a rider can
+	// realistically run in one round is an operational call, not a constant,
+	// and it differs between a dense city round and an intercity leg.
+	defaultMaxActive = 3
 )
 
+// maxActiveBookings reads the per-miler concurrent-stop cap, read per call so
+// it can be changed without a redeploy. A non-numeric or non-positive value
+// falls back to the default rather than uncapping the fleet by typo.
+func maxActiveBookings() int64 {
+	if v := strings.TrimSpace(os.Getenv("MILER_MAX_ACTIVE_BOOKINGS")); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 {
+			return int64(n)
+		}
+		utils.Warn("MILER_MAX_ACTIVE_BOOKINGS is not a positive integer, using the default",
+			"value", v, "default", defaultMaxActive)
+	}
+	return defaultMaxActive
+}
+
 type milerCandidate struct {
 	profile        models.MilerProfile
 	distanceKm     float64