fix for retention logic

cmd/telesrv/main_test.go

@@ -2,10 +2,43 @@ package main
 
 import (
 	"testing"
+	"time"
 
 	telegramloginapp "telesrv/internal/app/telegramlogin"
 )
 
+// TestFastestPositiveDurationIgnoresNonPositiveValues guards a real reported
+// bug: the storage retention sweep's ticker cadence used to be driven purely
+// by the shared TELESRV_STORAGE_RETENTION_MAX_AGE default (e.g. 30 days),
+// even when a much shorter TELESRV_STORAGE_RETENTION_MAX_AGE_<CATEGORY>
+// override was configured -- so a category set to "1 minute" would still
+// only actually get swept on the shared default's own slow cadence (or, if
+// the shared default was 0, would disable the sweep outright). The worker
+// must be handed the fastest positive age across the default and every
+// override instead.
+func TestFastestPositiveDurationIgnoresNonPositiveValues(t *testing.T) {
+	cases := []struct {
+		name string
+		a, b time.Duration
+		want time.Duration
+	}{
+		{"both positive, a smaller", 30 * 24 * time.Hour, time.Minute, time.Minute},
+		{"both positive, b smaller", time.Minute, 30 * 24 * time.Hour, time.Minute},
+		{"a zero (disabled), b positive", 0, time.Minute, time.Minute},
+		{"a positive, b zero (disabled)", time.Minute, 0, time.Minute},
+		{"a negative, b positive", -time.Hour, time.Minute, time.Minute},
+		{"both zero (nothing configured)", 0, 0, 0},
+		{"both negative", -time.Hour, -time.Minute, -time.Minute},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			if got := fastestPositiveDuration(c.a, c.b); got != c.want {
+				t.Fatalf("fastestPositiveDuration(%v, %v) = %v, want %v", c.a, c.b, got, c.want)
+			}
+		})
+	}
+}
+
 func TestTelegramLoginRPCDependencyPreservesDisabledNil(t *testing.T) {
 	var disabled *telegramloginapp.Service
 	if dependency := telegramLoginRPCDependency(disabled); dependency != nil {