Pull request 2111: 6545-schema-version

Updates #6545.

Squashed commit of the following:

commit b1969128a99ff21c97feb4e7805b4b8133d7122f
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:04:37 2023 +0300

    home: fix import

commit 872ccea1491a8da76cc24db79247438d0ce4d256
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:01:15 2023 +0300

    all: output schema version

internal/configmigrate/v20.go

@@ -0,0 +1,44 @@
+package configmigrate
+
+import (
+	"time"
+
+	"github.com/AdguardTeam/golibs/timeutil"
+)
+
+// migrateTo20 performs the following changes:
+//
+//	# BEFORE:
+//	'schema_version': 19
+//	'statistics':
+//	  'interval': 1
+//	  # …
+//	# …
+//
+//	# AFTER:
+//	'schema_version': 20
+//	'statistics':
+//	  'interval': 24h
+//	  # …
+//	# …
+func migrateTo20(diskConf yobj) (err error) {
+	diskConf["schema_version"] = 20
+
+	stats, ok, err := fieldVal[yobj](diskConf, "statistics")
+	if !ok {
+		return err
+	}
+
+	const field = "interval"
+
+	ivl, ok, err := fieldVal[int](stats, field)
+	if err != nil {
+		return err
+	} else if !ok || ivl == 0 {
+		ivl = 1
+	}
+
+	stats[field] = timeutil.Duration{Duration: time.Duration(ivl) * timeutil.Day}
+
+	return nil
+}