diff --git a/homeassistant-addon/CHANGELOG.md b/homeassistant-addon/CHANGELOG.md
index e2c7a8f..9150932 100644
--- a/homeassistant-addon/CHANGELOG.md
+++ b/homeassistant-addon/CHANGELOG.md
@@ -9,6 +9,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 If this add-on saves you time, you can [buy me a coffee](https://buymeacoffee.com/dougrathbone).
 
+## [1.35.0] - 2026-09-29
+
+### Fixed
+
+- **A USB PC Interface stuck while opening is now closed and reopened automatically.** (#122)
+- **Startup waits for the C-Bus interface before polling, avoiding repeated command failures.** (#122)
+- **Discovery keeps retrying while the C-Bus interface is unavailable.** (#122)
+- **Managed C-Gate file logs stay bounded between add-on restarts.** Set the maximum C-Gate log size option to change the 500 MiB default. (#122)
+
+## [1.34.16] - 2026-09-29
+
+### Fixed
+
+- **USB PC Interface recovery and managed C-Gate log limits.** (#122)
+
 ## [1.34.15] - 2026-09-28
 
 ### Fixed
diff --git a/homeassistant-addon/DOCS.md b/homeassistant-addon/DOCS.md
index cf827e2..4e24373 100644
--- a/homeassistant-addon/DOCS.md
+++ b/homeassistant-addon/DOCS.md
@@ -58,6 +58,7 @@ These settings only apply when `cgate_mode` is set to `managed`.
 | `cgate_download_url` | string | (empty) | Override the default download URL for C-Gate. Leave empty to use the official Clipsal URL. |
 | `cgate_download_sha256` | string | (empty) | Optional SHA256 of the C-Gate zip. When set, download and upload installs fail on mismatch. Downloads from the built-in default URL are verified against a checksum pinned in the install script; setting this overrides that pin (the escape hatch if Clipsal re-releases the zip). Required for a custom `cgate_download_url`; uploads without it proceed with a log warning and no integrity check. |
 | `cgate_force_reinstall` | boolean | `false` | Reinstall/upgrade C-Gate from the install source on the next start. Once C-Gate is installed it is normally kept as is across restarts; turn this on to replace it (for example to move to a newer C-Gate version). Your project DBs and config are preserved. Turn it back off after the upgrade, or C-Gate reinstalls on every boot. |
+| `cgate_log_max_mb` | integer | `500` | Maximum total size in MiB for managed C-Gate file logs. The add-on checks every 15 minutes and removes the oldest closed log files first. |
 | `cgate_serial_device` | device | (empty) | **BETA — opt-in, field-tested with 5500PC and 5500PCU.** Dropdown of the serial devices detected on the HA host. Prefer a `/dev/serial/by-id/...` alias over a bare `/dev/ttyUSB0`: it survives replugging into another USB port. Hidden optional field; leave empty to disable. See "USB-serial PCI support" below. |
 | `cgate_external_clients` | list of objects | `[]` | Addresses allowed to connect to the managed C-Gate (for tools such as C-Bus Toolkit), each with an `address` and a `level` of `monitor`, `operate` or `program`. Empty means the add-on itself only. **C-Gate has no authentication on its ports** — see "Letting external clients reach managed C-Gate" below before using this. |
 
@@ -98,6 +99,16 @@ On every start the add-on:
 - if log files still exceed 500 MiB total, deletes the oldest segments until
   under that cap
 
+While the add-on remains running, it repeats the size and age cleanup every
+15 minutes. Set the optional `cgate_log_max_mb` value (50–10000, default 500)
+to choose the maximum retained C-Gate file-log size. Files C-Gate is actively
+writing are never deleted; its native rotation closes them before cleanup.
+
+This is separate from the add-on log shown by Home Assistant. cgateweb writes
+that log to stdout/stderr so Supervisor manages it. `/data` is already the
+standard persistent add-on volume, so mapping another host folder does not
+provide Home Assistant log rotation and is not required.
+
 Your project databases and `config/` are never touched. The active `event.log`
 is kept; only older rotated segments are eligible for pruning.
 
diff --git a/homeassistant-addon/config.yaml b/homeassistant-addon/config.yaml
index 796b611..43cc937 100644
--- a/homeassistant-addon/config.yaml
+++ b/homeassistant-addon/config.yaml
@@ -1,5 +1,5 @@
 name: "C-Gate Web Bridge"
-version: "1.34.15"
+version: "1.35.0"
 slug: cgateweb
 description: "Bridge between Clipsal C-Bus systems and MQTT/Home Assistant"
 url: "https://github.com/dougrathbone/cgateweb"
@@ -132,6 +132,7 @@ schema:
   # ── C-Gate Managed Mode ──
   cgate_install_source: "list(download|upload)?"
   cgate_download_url: "str?"
+  cgate_log_max_mb: "int(50,10000)?"
   cgate_download_sha256: "str?"
   cgate_force_reinstall: "bool?"
   # USB-serial PCI passthrough (beta, issue #28): opt-in. The device schema
diff --git a/homeassistant-addon/rootfs/etc/cont-init.d/cgate-install.sh b/homeassistant-addon/rootfs/etc/cont-init.d/cgate-install.sh
index a20278b..5b995e5 100755
--- a/homeassistant-addon/rootfs/etc/cont-init.d/cgate-install.sh
+++ b/homeassistant-addon/rootfs/etc/cont-init.d/cgate-install.sh
@@ -33,11 +33,13 @@ CGATEWEB_DEFAULT_PAYLOAD_SHA256="b135a367f435b63ec0a08e5cde0b96735da23c8a48f3f48
 
 # Managed C-Gate log retention (#81). C-Gate writes unbounded files under
 # /data/cgate/logs/ and rotated event-file segments; without a cap a busy
-# network can fill the host SD card. Pruned on every boot before C-Gate starts.
+# network can fill the host SD card. Pruned on every boot before C-Gate starts
+# and periodically by the cgate-log-pruner service while it remains running.
 CGATEWEB_LOG_MAX_BYTES="${CGATEWEB_LOG_MAX_BYTES:-524288000}"   # 500 MiB
 CGATEWEB_LOG_MAX_AGE_DAYS="${CGATEWEB_LOG_MAX_AGE_DAYS:-7}"
 CGATEWEB_EVENT_FILE_SPLIT_SIZE="${CGATEWEB_EVENT_FILE_SPLIT_SIZE:-5000000}"  # 5 MiB (C-Gate default)
 CGATEWEB_EVENT_FILE_SPLIT_COUNT="${CGATEWEB_EVENT_FILE_SPLIT_COUNT:-50}"   # ~250 MiB of event segments
+CGATEWEB_PROC_ROOT="${CGATEWEB_PROC_ROOT:-/proc}"
 
 # The identity-aware serial resolver (issue #28) and the file it publishes its
 # answer to. Both are overridable so the unit tests can run the repo copy of
@@ -370,10 +372,23 @@ _cgateweb_stat_mtime() {
     stat -c '%Y' "$1" 2>/dev/null || stat -f '%m' "$1" 2>/dev/null || echo 0
 }
 
-# Return 0 when a file under the managed C-Gate install may be pruned.
-# Only log directories and rotated event-file segments are eligible — never
-# Projects/, config/, or the live event.log C-Gate is writing.
-_cgateweb_prune_cgate_logs_is_prunable() {
+# Return 0 when a running process currently has the file open. Runtime pruning
+# must not unlink an active C-Gate log: the JVM would keep writing to the
+# unlinked inode, so the disk space would remain consumed but become invisible
+# to later retention passes. Startup pruning normally finds no open files.
+_cgateweb_log_file_is_open() {
+    local file="$1" fd target
+    for fd in "${CGATEWEB_PROC_ROOT}"/[0-9]*/fd/*; do
+        [[ -e "${fd}" || -L "${fd}" ]] || continue
+        target=$(readlink -f "${fd}" 2>/dev/null || true)
+        [[ "${target}" == "${file}" ]] && return 0
+    done
+    return 1
+}
+
+# Return 0 for files that count toward managed C-Gate's log budget. Only log
+# directories and event-file segments are in scope — never Projects/ or config/.
+_cgateweb_prune_cgate_logs_is_in_scope() {
     local cgate_dir="$1" file="$2"
     case "${file}" in
         "${cgate_dir}/logs"/*|"${cgate_dir}/log"/*) return 0 ;;
@@ -387,9 +402,18 @@ _cgateweb_prune_cgate_logs_is_prunable() {
     esac
 }
 
+# Return 0 when an in-scope file can safely be deleted. An open file still
+# counts toward the cap, but remains until C-Gate closes or rotates it.
+_cgateweb_prune_cgate_logs_is_prunable() {
+    local cgate_dir="$1" file="$2"
+    _cgateweb_prune_cgate_logs_is_in_scope "${cgate_dir}" "${file}" || return 1
+    _cgateweb_log_file_is_open "${file}" && return 1
+    return 0
+}
+
 # Prune C-Gate log files under the managed install directory. Runs on every
-# boot before C-Gate starts so a reinstall is not the only way to reclaim
-# space (#81). Echoes a one-line summary when anything was removed.
+# boot and periodically while C-Gate is running so a long-lived add-on cannot
+# grow unchecked (#81). Echoes a one-line summary when anything was removed.
 _cgateweb_prune_cgate_logs() {
     local cgate_dir="$1"
     local max_bytes="${2:-${CGATEWEB_LOG_MAX_BYTES}}"
@@ -400,7 +424,7 @@ _cgateweb_prune_cgate_logs() {
     [[ -d "${cgate_dir}" ]] || return 0
 
     while IFS= read -r -d '' file; do
-        _cgateweb_prune_cgate_logs_is_prunable "${cgate_dir}" "${file}" || continue
+        _cgateweb_prune_cgate_logs_is_in_scope "${cgate_dir}" "${file}" || continue
         candidates+=("${file}")
     done < <(find "${cgate_dir}" \( -path "${cgate_dir}/logs/*" -o -path "${cgate_dir}/log/*" \
         -o -name 'event.*.log' -o -name 'event-*' \) -type f -print0 2>/dev/null)
@@ -411,6 +435,7 @@ _cgateweb_prune_cgate_logs() {
 
     for file in "${candidates[@]}"; do
         [[ -f "${file}" ]] || continue
+        _cgateweb_prune_cgate_logs_is_prunable "${cgate_dir}" "${file}" || continue
         if find "${file}" -mtime +"${max_age_days}" -print -quit 2>/dev/null | grep -q .; then
             age_bytes=$(_cgateweb_stat_size "${file}")
             rm -f "${file}" && deleted_age=$((deleted_age + 1)) && reclaimed=$((reclaimed + age_bytes))
@@ -420,7 +445,7 @@ _cgateweb_prune_cgate_logs() {
     # Rebuild the candidate list after age pruning.
     candidates=()
     while IFS= read -r -d '' file; do
-        _cgateweb_prune_cgate_logs_is_prunable "${cgate_dir}" "${file}" || continue
+        _cgateweb_prune_cgate_logs_is_in_scope "${cgate_dir}" "${file}" || continue
         candidates+=("${file}")
     done < <(find "${cgate_dir}" \( -path "${cgate_dir}/logs/*" -o -path "${cgate_dir}/log/*" \
         -o -name 'event.*.log' -o -name 'event-*' \) -type f -print0 2>/dev/null)
@@ -446,6 +471,7 @@ _cgateweb_prune_cgate_logs() {
         for i in "${!candidates[@]}"; do
             file="${candidates[$i]}"
             [[ -f "${file}" ]] || continue
+            _cgateweb_prune_cgate_logs_is_prunable "${cgate_dir}" "${file}" || continue
             mtime=$(_cgateweb_stat_mtime "${file}")
             if [[ ${mtime} -lt ${oldest_mtime} ]]; then
                 oldest_mtime=${mtime}
@@ -1128,6 +1154,21 @@ if [[ "${CGATE_MODE}" != "managed" ]]; then
     exit 0
 fi
 
+# Keep the existing 500 MiB default but let managed-mode users choose a lower
+# or higher ceiling. The Supervisor schema validates this as an integer; the
+# fallback also keeps direct/test execution safe.
+CGATE_LOG_MAX_MB=$(bashio::config 'cgate_log_max_mb' '500')
+[[ "${CGATE_LOG_MAX_MB}" =~ ^[0-9]+$ ]] || CGATE_LOG_MAX_MB=500
+CGATEWEB_LOG_MAX_BYTES=$((CGATE_LOG_MAX_MB * 1048576))
+
+# Reserve at most half of the overall budget for C-Gate's native event-file
+# rotation. At the default this preserves the historical 50 x 5 MiB setting;
+# smaller user caps reduce the native segment count so the periodic pruner does
+# not spend its time fighting a larger built-in retention target.
+CGATEWEB_EVENT_FILE_SPLIT_COUNT=$((CGATEWEB_LOG_MAX_BYTES / CGATEWEB_EVENT_FILE_SPLIT_SIZE / 2))
+[[ ${CGATEWEB_EVENT_FILE_SPLIT_COUNT} -lt 2 ]] && CGATEWEB_EVENT_FILE_SPLIT_COUNT=2
+[[ ${CGATEWEB_EVENT_FILE_SPLIT_COUNT} -gt 50 ]] && CGATEWEB_EVENT_FILE_SPLIT_COUNT=50
+
 # Overridable so tests can point the whole install flow at a temp dir instead
 # of the real /data/cgate, the same test-seam pattern used by
 # CGATEWEB_SERIAL_DEVICE_FILE above. Unset in production, so this always
diff --git a/homeassistant-addon/rootfs/etc/services.d/cgate-log-pruner/run b/homeassistant-addon/rootfs/etc/services.d/cgate-log-pruner/run
new file mode 100755
index 0000000..5971bbe
--- /dev/null
+++ b/homeassistant-addon/rootfs/etc/services.d/cgate-log-pruner/run
@@ -0,0 +1,24 @@
+#!/usr/bin/with-contenv bashio
+# Keep managed C-Gate's private file logs bounded between add-on restarts.
+set -euo pipefail
+
+CGATE_MODE=$(bashio::config 'cgate_mode' 'remote')
+if [[ "${CGATE_MODE}" != "managed" ]]; then
+    exec sleep infinity
+fi
+
+CGATE_DIR="${CGATE_DIR:-/data/cgate}"
+CGATEWEB_LOG_PRUNE_INTERVAL_SECONDS="${CGATEWEB_LOG_PRUNE_INTERVAL_SECONDS:-900}"
+CGATE_LOG_MAX_MB=$(bashio::config 'cgate_log_max_mb' '500')
+[[ "${CGATE_LOG_MAX_MB}" =~ ^[0-9]+$ ]] || CGATE_LOG_MAX_MB=500
+CGATEWEB_LOG_MAX_BYTES=$((CGATE_LOG_MAX_MB * 1048576))
+
+# Source the install script in library mode so startup and runtime retention
+# use exactly the same path allowlist and deletion rules.
+export CGATEWEB_INSTALL_SOURCE_ONLY=1
+# shellcheck disable=SC1090
+source "${CGATEWEB_INSTALL_SCRIPT:-/etc/cont-init.d/cgate-install.sh}"
+
+while sleep "${CGATEWEB_LOG_PRUNE_INTERVAL_SECONDS}"; do
+    _cgateweb_prune_cgate_logs "${CGATE_DIR}" "${CGATEWEB_LOG_MAX_BYTES}"
+done
diff --git a/homeassistant-addon/translations/catalog.yaml b/homeassistant-addon/translations/catalog.yaml
index e175efe..c9f3728 100644
--- a/homeassistant-addon/translations/catalog.yaml
+++ b/homeassistant-addon/translations/catalog.yaml
@@ -892,6 +892,85 @@ configuration:
         (бази даних проєкту та конфігурація зберігаються); у режимі завантаження
         можна натомість покласти новіший zip у /share/cgate. Вимкніть його після
         оновлення.
+  cgate_log_max_mb:
+    name:
+      en: Maximum C-Gate Log Size
+      de: Maximale C-Gate-Protokollgröße
+      es: Tamaño máximo del registro de C-Gate
+      fr: Taille maximale des journaux C-Gate
+      it: Dimensione massima dei log C-Gate
+      nl: Maximale grootte van C-Gate-logboeken
+      pt: Tamanho máximo dos registos do C-Gate
+      ru: Максимальный размер журналов C-Gate
+      zh: C-Gate 日志最大大小
+      ja: C-Gate ログの最大サイズ
+      ko: 최대 C-Gate 로그 크기
+      pl: Maksymalny rozmiar dzienników C-Gate
+      sv: Maximal storlek för C-Gate-loggar
+      no: Maksimal størrelse på C-Gate-logger
+      da: Maksimal størrelse på C-Gate-logfiler
+      cs: Maximální velikost protokolů C-Gate
+      uk: Максимальний розмір журналів C-Gate
+    description:
+      en: >-
+        Maximum total size in MiB for managed C-Gate file logs. The oldest
+        closed log files are removed every 15 minutes. Default: 500.
+      de: >-
+        Maximale Gesamtgröße in MiB für Protokolldateien des verwalteten C-Gate.
+        Die ältesten geschlossenen Dateien werden alle 15 Minuten entfernt.
+        Standard: 500.
+      es: >-
+        Tamaño total máximo en MiB de los archivos de registro de C-Gate
+        gestionado. Los archivos cerrados más antiguos se eliminan cada 15
+        minutos. Predeterminado: 500.
+      fr: >-
+        Taille totale maximale en Mio des fichiers journaux du C-Gate géré. Les
+        plus anciens fichiers fermés sont supprimés toutes les 15 minutes. Par
+        défaut : 500.
+      it: >-
+        Dimensione totale massima in MiB dei file di log di C-Gate gestito. I
+        file chiusi meno recenti vengono rimossi ogni 15 minuti. Predefinito:
+        500.
+      nl: >-
+        Maximale totale grootte in MiB voor logbestanden van beheerde C-Gate. De
+        oudste gesloten bestanden worden elke 15 minuten verwijderd. Standaard:
+        500.
+      pt: >-
+        Tamanho total máximo em MiB dos ficheiros de registo do C-Gate gerido.
+        Os ficheiros fechados mais antigos são removidos a cada 15 minutos.
+        Predefinição: 500.
+      ru: >-
+        Максимальный общий размер файлов журналов управляемого C-Gate в МиБ.
+        Самые старые закрытые файлы удаляются каждые 15 минут. По умолчанию:
+        500.
+      zh: >-
+        托管 C-Gate 文件日志的最大总大小（MiB）。每 15 分钟删除最旧的已关闭日志文件。默认值：500。
+      ja: >-
+        マネージド C-Gate のログファイルの合計上限（MiB）です。閉じられた古いログファイルを 15
+        分ごとに削除します。既定値：500。
+      ko: >-
+        관리형 C-Gate 파일 로그의 최대 총크기(MiB)입니다. 닫힌 로그 파일 중 가장 오래된 파일을 15분마다
+        삭제합니다. 기본값: 500.
+      pl: >-
+        Maksymalny łączny rozmiar plików dziennika zarządzanego C-Gate w MiB.
+        Najstarsze zamknięte pliki są usuwane co 15 minut. Domyślnie: 500.
+      sv: >-
+        Maximal total storlek i MiB för hanterade C-Gate-loggfiler. De äldsta
+        stängda filerna tas bort var 15:e minut. Standard: 500.
+      no: >-
+        Maksimal samlet størrelse i MiB for administrerte C-Gate-loggfiler. De
+        eldste lukkede filene fjernes hvert 15. minutt. Standard: 500.
+      da: >-
+        Maksimal samlet størrelse i MiB for administrerede C-Gate-logfiler. De
+        ældste lukkede filer fjernes hvert 15. minut. Standard: 500.
+      cs: >-
+        Maximální celková velikost souborů protokolu spravovaného C-Gate v MiB.
+        Nejstarší zavřené soubory se odstraňují každých 15 minut. Výchozí
+        hodnota: 500.
+      uk: >-
+        Максимальний загальний розмір файлів журналів керованого C-Gate у МіБ.
+        Найстаріші закриті файли видаляються кожні 15 хвилин. Типове значення:
+        500.
   cgate_serial_device:
     name:
       en: Serial PCI Device (Beta)
diff --git a/homeassistant-addon/translations/cs.yaml b/homeassistant-addon/translations/cs.yaml
index bd4613c..3ff4b16 100644
--- a/homeassistant-addon/translations/cs.yaml
+++ b/homeassistant-addon/translations/cs.yaml
@@ -61,6 +61,12 @@ configuration:
       přeinstalovat/aktualizovat C-Gate ze zdroje instalace (databáze projektu a
       konfigurace zůstanou zachovány); v režimu nahrávání můžete místo toho
       umístit novější zip do /share/cgate. Po aktualizaci ji opět vypněte.
+  cgate_log_max_mb:
+    name: Maximální velikost protokolů C-Gate
+    description: >-
+      Maximální celková velikost souborů protokolu spravovaného C-Gate v MiB.
+      Nejstarší zavřené soubory se odstraňují každých 15 minut. Výchozí hodnota:
+      500.
   cgate_serial_device:
     name: Sériové PCI zařízení (beta)
     description: >-
diff --git a/homeassistant-addon/translations/da.yaml b/homeassistant-addon/translations/da.yaml
index e1d63e8..6b3600d 100644
--- a/homeassistant-addon/translations/da.yaml
+++ b/homeassistant-addon/translations/da.yaml
@@ -61,6 +61,11 @@ configuration:
       (dine projektdatabaser og konfiguration bevares); i upload-tilstand kan du
       i stedet lægge en nyere zip i /share/cgate. Slå det fra igen efter
       opgraderingen.
+  cgate_log_max_mb:
+    name: Maksimal størrelse på C-Gate-logfiler
+    description: >-
+      Maksimal samlet størrelse i MiB for administrerede C-Gate-logfiler. De
+      ældste lukkede filer fjernes hvert 15. minut. Standard: 500.
   cgate_serial_device:
     name: Seriel PCI-enhed (beta)
     description: >-
diff --git a/homeassistant-addon/translations/de.yaml b/homeassistant-addon/translations/de.yaml
index 3cc3c55..db41608 100644
--- a/homeassistant-addon/translations/de.yaml
+++ b/homeassistant-addon/translations/de.yaml
@@ -63,6 +63,12 @@ configuration:
       Projekt-Datenbanken und Konfiguration bleiben erhalten); im Upload-Modus
       können Sie stattdessen eine neuere zip in /share/cgate ablegen. Schalten
       Sie dies nach dem Upgrade wieder aus.
+  cgate_log_max_mb:
+    name: Maximale C-Gate-Protokollgröße
+    description: >-
+      Maximale Gesamtgröße in MiB für Protokolldateien des verwalteten C-Gate.
+      Die ältesten geschlossenen Dateien werden alle 15 Minuten entfernt.
+      Standard: 500.
   cgate_serial_device:
     name: Serielles PCI-Gerät (Beta)
     description: >-
diff --git a/homeassistant-addon/translations/en.yaml b/homeassistant-addon/translations/en.yaml
index 47b4a6d..447aa7c 100644
--- a/homeassistant-addon/translations/en.yaml
+++ b/homeassistant-addon/translations/en.yaml
@@ -59,6 +59,11 @@ configuration:
       the next start (your project DBs and config are preserved). In upload mode
       you can instead just drop a newer zip into /share/cgate and it upgrades
       automatically. Turn this back off after the upgrade.
+  cgate_log_max_mb:
+    name: Maximum C-Gate Log Size
+    description: >-
+      Maximum total size in MiB for managed C-Gate file logs. The oldest closed
+      log files are removed every 15 minutes. Default: 500.
   cgate_serial_device:
     name: Serial PCI Device (Beta)
     description: >-
diff --git a/homeassistant-addon/translations/es.yaml b/homeassistant-addon/translations/es.yaml
index b3f76b6..23b1d42 100644
--- a/homeassistant-addon/translations/es.yaml
+++ b/homeassistant-addon/translations/es.yaml
@@ -63,6 +63,12 @@ configuration:
       fuente de instalación en el próximo inicio (sus bases de datos de proyecto
       y la configuración se conservan); en modo de carga puede colocar un zip
       más reciente en /share/cgate. Desactívelo después de la actualización.
+  cgate_log_max_mb:
+    name: Tamaño máximo del registro de C-Gate
+    description: >-
+      Tamaño total máximo en MiB de los archivos de registro de C-Gate
+      gestionado. Los archivos cerrados más antiguos se eliminan cada 15
+      minutos. Predeterminado: 500.
   cgate_serial_device:
     name: Dispositivo PCI serie (beta)
     description: >-
diff --git a/homeassistant-addon/translations/fr.yaml b/homeassistant-addon/translations/fr.yaml
index 7ea4e2f..a8ec919 100644
--- a/homeassistant-addon/translations/fr.yaml
+++ b/homeassistant-addon/translations/fr.yaml
@@ -67,6 +67,12 @@ configuration:
       données de projet et la configuration sont conservées) ; en mode upload,
       vous pouvez aussi déposer un zip plus récent dans /share/cgate.
       Désactivez-la après la mise à jour.
+  cgate_log_max_mb:
+    name: Taille maximale des journaux C-Gate
+    description: >-
+      Taille totale maximale en Mio des fichiers journaux du C-Gate géré. Les
+      plus anciens fichiers fermés sont supprimés toutes les 15 minutes. Par
+      défaut : 500.
   cgate_serial_device:
     name: Périphérique PCI série (bêta)
     description: >-
diff --git a/homeassistant-addon/translations/it.yaml b/homeassistant-addon/translations/it.yaml
index 51c87ba..ab4f5dd 100644
--- a/homeassistant-addon/translations/it.yaml
+++ b/homeassistant-addon/translations/it.yaml
@@ -64,6 +64,11 @@ configuration:
       avvio (i database del progetto e la configurazione vengono conservati); in
       modalità upload puoi invece inserire uno zip più recente in /share/cgate.
       Disattivala dopo l'aggiornamento.
+  cgate_log_max_mb:
+    name: Dimensione massima dei log C-Gate
+    description: >-
+      Dimensione totale massima in MiB dei file di log di C-Gate gestito. I file
+      chiusi meno recenti vengono rimossi ogni 15 minuti. Predefinito: 500.
   cgate_serial_device:
     name: Dispositivo PCI seriale (beta)
     description: >-
diff --git a/homeassistant-addon/translations/ja.yaml b/homeassistant-addon/translations/ja.yaml
index 1f1e40c..c3d6cb3 100644
--- a/homeassistant-addon/translations/ja.yaml
+++ b/homeassistant-addon/translations/ja.yaml
@@ -47,6 +47,9 @@ configuration:
       は通常そのまま維持されます。これを有効にすると、次回起動時にインストールソースから C-Gate
       を再インストール／アップグレードします（プロジェクトのデータベースと設定は保持されます）。アップロードモードでは、代わりに新しい zip を
       /share/cgate に置くこともできます。アップグレード後はオフに戻してください。
+  cgate_log_max_mb:
+    name: C-Gate ログの最大サイズ
+    description: マネージド C-Gate のログファイルの合計上限（MiB）です。閉じられた古いログファイルを 15 分ごとに削除します。既定値：500。
   cgate_serial_device:
     name: シリアル PCI デバイス（ベータ）
     description: >-
diff --git a/homeassistant-addon/translations/ko.yaml b/homeassistant-addon/translations/ko.yaml
index cd40ff0..c4bc629 100644
--- a/homeassistant-addon/translations/ko.yaml
+++ b/homeassistant-addon/translations/ko.yaml
@@ -47,6 +47,10 @@ configuration:
       관리 모드에서만 사용됩니다. C-Gate는 설치된 후 일반적으로 그대로 유지됩니다. 이 옵션을 켜면 다음 시작 시 설치 소스에서
       C-Gate를 다시 설치/업그레이드합니다(프로젝트 데이터베이스와 구성은 유지됩니다). 업로드 모드에서는 대신 최신 zip을
       /share/cgate에 넣을 수 있습니다. 업그레이드 후에는 다시 꺼 주세요.
+  cgate_log_max_mb:
+    name: 최대 C-Gate 로그 크기
+    description: "관리형 C-Gate 파일 로그의 최대 총크기(MiB)입니다. 닫힌 로그 파일 중 가장 오래된 파일을 15분마다 삭제합니다. 기본값:
+      500."
   cgate_serial_device:
     name: 시리얼 PCI 장치(베타)
     description: >-
diff --git a/homeassistant-addon/translations/nl.yaml b/homeassistant-addon/translations/nl.yaml
index 958b83f..a972dc2 100644
--- a/homeassistant-addon/translations/nl.yaml
+++ b/homeassistant-addon/translations/nl.yaml
@@ -61,6 +61,12 @@ configuration:
       projectdatabases en configuratie blijven behouden); in upload-modus kunt u
       in plaats daarvan een nieuwere zip in /share/cgate plaatsen. Schakel dit
       na de upgrade weer uit.
+  cgate_log_max_mb:
+    name: Maximale grootte van C-Gate-logboeken
+    description: >-
+      Maximale totale grootte in MiB voor logbestanden van beheerde C-Gate. De
+      oudste gesloten bestanden worden elke 15 minuten verwijderd. Standaard:
+      500.
   cgate_serial_device:
     name: Serieel PCI-apparaat (beta)
     description: >-
diff --git a/homeassistant-addon/translations/no.yaml b/homeassistant-addon/translations/no.yaml
index 9d566e7..5ff016d 100644
--- a/homeassistant-addon/translations/no.yaml
+++ b/homeassistant-addon/translations/no.yaml
@@ -61,6 +61,11 @@ configuration:
       nytt fra installasjonskilden ved neste oppstart (prosjektdatabasene og
       konfigurasjonen beholdes); i opplastingsmodus kan du i stedet legge en
       nyere zip i /share/cgate. Slå det av igjen etter oppgraderingen.
+  cgate_log_max_mb:
+    name: Maksimal størrelse på C-Gate-logger
+    description: >-
+      Maksimal samlet størrelse i MiB for administrerte C-Gate-loggfiler. De
+      eldste lukkede filene fjernes hvert 15. minutt. Standard: 500.
   cgate_serial_device:
     name: Seriell PCI-enhet (beta)
     description: >-
diff --git a/homeassistant-addon/translations/pl.yaml b/homeassistant-addon/translations/pl.yaml
index a85152f..1882d90 100644
--- a/homeassistant-addon/translations/pl.yaml
+++ b/homeassistant-addon/translations/pl.yaml
@@ -61,6 +61,11 @@ configuration:
       danych projektu i konfiguracja zostają zachowane); w trybie przesyłania
       możesz zamiast tego umieścić nowszy zip w /share/cgate. Wyłącz ją po
       aktualizacji.
+  cgate_log_max_mb:
+    name: Maksymalny rozmiar dzienników C-Gate
+    description: >-
+      Maksymalny łączny rozmiar plików dziennika zarządzanego C-Gate w MiB.
+      Najstarsze zamknięte pliki są usuwane co 15 minut. Domyślnie: 500.
   cgate_serial_device:
     name: Urządzenie PCI szeregowe (beta)
     description: >-
diff --git a/homeassistant-addon/translations/pt.yaml b/homeassistant-addon/translations/pt.yaml
index 6179570..3bbd4ce 100644
--- a/homeassistant-addon/translations/pt.yaml
+++ b/homeassistant-addon/translations/pt.yaml
@@ -62,6 +62,12 @@ configuration:
       projeto e a configuração são preservadas); no modo de carregamento pode
       antes colocar um zip mais recente em /share/cgate. Desative isto após a
       atualização.
+  cgate_log_max_mb:
+    name: Tamanho máximo dos registos do C-Gate
+    description: >-
+      Tamanho total máximo em MiB dos ficheiros de registo do C-Gate gerido. Os
+      ficheiros fechados mais antigos são removidos a cada 15 minutos.
+      Predefinição: 500.
   cgate_serial_device:
     name: Dispositivo PCI série (beta)
     description: >-
diff --git a/homeassistant-addon/translations/ru.yaml b/homeassistant-addon/translations/ru.yaml
index 7e3b9d6..563d31c 100644
--- a/homeassistant-addon/translations/ru.yaml
+++ b/homeassistant-addon/translations/ru.yaml
@@ -62,6 +62,11 @@ configuration:
       запуске (ваши базы данных проекта и конфигурация сохраняются); в режиме
       загрузки можно вместо этого поместить более новый zip в /share/cgate.
       Выключите его после обновления.
+  cgate_log_max_mb:
+    name: Максимальный размер журналов C-Gate
+    description: >-
+      Максимальный общий размер файлов журналов управляемого C-Gate в МиБ. Самые
+      старые закрытые файлы удаляются каждые 15 минут. По умолчанию: 500.
   cgate_serial_device:
     name: Последовательное PCI-устройство (бета)
     description: >-
diff --git a/homeassistant-addon/translations/sv.yaml b/homeassistant-addon/translations/sv.yaml
index 8b4d2a8..ae97bcd 100644
--- a/homeassistant-addon/translations/sv.yaml
+++ b/homeassistant-addon/translations/sv.yaml
@@ -60,6 +60,11 @@ configuration:
       från installationskällan vid nästa start (dina projektdatabaser och
       konfiguration bevaras); i uppladdningsläge kan du i stället lägga en nyare
       zip i /share/cgate. Stäng av detta efter uppgraderingen.
+  cgate_log_max_mb:
+    name: Maximal storlek för C-Gate-loggar
+    description: >-
+      Maximal total storlek i MiB för hanterade C-Gate-loggfiler. De äldsta
+      stängda filerna tas bort var 15:e minut. Standard: 500.
   cgate_serial_device:
     name: Seriell PCI-enhet (beta)
     description: >-
diff --git a/homeassistant-addon/translations/uk.yaml b/homeassistant-addon/translations/uk.yaml
index 4b1f088..672518c 100644
--- a/homeassistant-addon/translations/uk.yaml
+++ b/homeassistant-addon/translations/uk.yaml
@@ -62,6 +62,12 @@ configuration:
       (бази даних проєкту та конфігурація зберігаються); у режимі завантаження
       можна натомість покласти новіший zip у /share/cgate. Вимкніть його після
       оновлення.
+  cgate_log_max_mb:
+    name: Максимальний розмір журналів C-Gate
+    description: >-
+      Максимальний загальний розмір файлів журналів керованого C-Gate у МіБ.
+      Найстаріші закриті файли видаляються кожні 15 хвилин. Типове значення:
+      500.
   cgate_serial_device:
     name: Послідовний PCI-пристрій (бета)
     description: >-
diff --git a/homeassistant-addon/translations/zh.yaml b/homeassistant-addon/translations/zh.yaml
index 35b76c6..6c9724c 100644
--- a/homeassistant-addon/translations/zh.yaml
+++ b/homeassistant-addon/translations/zh.yaml
@@ -38,6 +38,9 @@ configuration:
     description: >-
       仅在托管模式下使用。C-Gate 安装后通常保持不变。启用此选项可在下次启动时从安装源重新安装/升级
       C-Gate（您的项目数据库和配置会被保留）；在上传模式下，您也可以将较新的 zip 放入 /share/cgate。升级完成后请将其关闭。
+  cgate_log_max_mb:
+    name: C-Gate 日志最大大小
+    description: 托管 C-Gate 文件日志的最大总大小（MiB）。每 15 分钟删除最旧的已关闭日志文件。默认值：500。
   cgate_serial_device:
     name: 串口 PCI 设备（Beta）
     description: >-
diff --git a/package-lock.json b/package-lock.json
index 2be651e..f2c8736 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cgateweb",
-  "version": "1.34.15",
+  "version": "1.35.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cgateweb",
-      "version": "1.34.15",
+      "version": "1.35.0",
       "license": "MIT",
       "dependencies": {
         "adm-zip": "^0.6.1",
diff --git a/package.json b/package.json
index 296631b..6fadbaa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cgateweb",
-  "version": "1.34.15",
+  "version": "1.35.0",
   "description": "Node.js bridge connecting Clipsal C-Bus automation systems to MQTT for Home Assistant integration",
   "keywords": [
     "cbus",
diff --git a/tests/cgateInstallScript.test.js b/tests/cgateInstallScript.test.js
index 2d70898..62170d7 100644
--- a/tests/cgateInstallScript.test.js
+++ b/tests/cgateInstallScript.test.js
@@ -603,6 +603,38 @@ describeBash('cgate-install.sh helpers', () => {
             expect(r.remaining).toEqual(['event.log']);
         });
 
+        test('does not unlink a log file that a process has open', () => {
+            const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'cgate-prune-open-'));
+            const cgateDir = path.join(dir, 'cgate');
+            const procRoot = path.join(dir, 'proc');
+            const logFile = path.join(cgateDir, 'logs', 'active.log');
+            const closedLogFile = path.join(cgateDir, 'logs', 'closed.log');
+            fs.mkdirSync(path.dirname(logFile), { recursive: true });
+            fs.mkdirSync(path.join(procRoot, '123', 'fd'), { recursive: true });
+            fs.writeFileSync(logFile, 'x'.repeat(5000));
+            fs.writeFileSync(closedLogFile, 'x'.repeat(5000));
+            fs.symlinkSync(logFile, path.join(procRoot, '123', 'fd', '4'));
+
+            const env = {
+                ...process.env,
+                CGATEWEB_INSTALL_SOURCE_ONLY: '1',
+                CGW_INSTALL_SCRIPT: SCRIPT,
+                CGATEWEB_SERIAL_DEVICE_LIB: SERIAL_DEVICE_LIB,
+                CGATEWEB_PROC_ROOT: procRoot,
+                CGW_ARG_0: cgateDir
+            };
+            const script = `
+                set -u
+                ${BASHIO_STUB_WITH_LOGS}
+                source "$CGW_INSTALL_SCRIPT"
+                _cgateweb_prune_cgate_logs "$CGW_ARG_0" 100 0
+            `;
+            execFileSync('bash', ['-c', script], { encoding: 'utf8', env });
+            expect(fs.existsSync(logFile)).toBe(true);
+            expect(fs.existsSync(closedLogFile)).toBe(false);
+            fs.rmSync(dir, { recursive: true, force: true });
+        });
+
         test('does not touch project databases or config', () => {
             const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'cgate-prune-safe-'));
             const cgateDir = path.join(dir, 'cgate');
diff --git a/tests/configSchema.test.js b/tests/configSchema.test.js
index 296abb1..d4d5add 100644
--- a/tests/configSchema.test.js
+++ b/tests/configSchema.test.js
@@ -228,6 +228,7 @@ describe('settings schema — aliases', () => {
         cover_ramp_duration_sec: 'Seconds; cover_ramp_duration_ms is milliseconds.',
         cgate_download_sha256: 'Add-on container script only; no runtime setting reads it.',
         cgate_force_reinstall: 'Add-on container script only; no runtime setting reads it.',
+        cgate_log_max_mb: 'Add-on container scripts only; no runtime setting reads it.',
         cgate_external_clients: 'Add-on container script only; no runtime setting reads it.'
     };