v1.3.9 — data-loss & stability fixes

A stability-focused release driven by a performance/reliability code review, plus two community contributor PRs.

🐛 Fixes

• Silent persistence data loss when ClickHouse degrades — when ClickHouse was healthy the SQLite write was skipped, but the in-memory batch was cleared before the async ClickHouse write was confirmed, so a failed write (queue full / partial-table / timeout) lost the data. The collector now writes the batch to SQLite as a durable fallback on ClickHouse failure; a full queue counts toward "unhealthy"; and health resets only after a complete detail+agg batch so a persistently-failing table can't mask the outage.
• Agent under-counted traffic on counter resets — the Go agent dropped traffic to zero when a flow counter went backwards (gateway restart / id reuse); it now counts the current value as new traffic, matching the direct collector.
• Deleting a backend left orphaned data — PRAGMA foreign_keys is OFF so the declared ON DELETE CASCADE never fired; deleteBackend now explicitly removes all associated data.
• #65 — Collector didn't recover after a backend password change — the socket is now torn down synchronously before flushing, so it can't reconnect with the stale token.
• #61 — WebSocket port env vars had no effect — runtime-config.js is now loaded beforeInteractive, served no-store, and excluded from the PWA precache, so WS_EXTERNAL_PORT takes effect instead of falling back to the build-time default.
• #67 — Mihomo proxy groups parsed as rules (PR #68, thanks @cesaryuan) — rule names now use the real matched rule via a shared helper.
• #74 — Collector silently hangs, stops syncing (PR #76, thanks @zj1123581321) — adds a WebSocket heartbeat watchdog that detects silently-dropped TCP connections and reconnects.

⚡ Improvements

• WebSocket reconnect now uses exponential backoff with jitter (reset on connect) to avoid reconnect storms; the Surge collector's backoff also gains jitter. Tunable via WS_MAX_RECONNECT_INTERVAL_MS (default 60s).

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Full changelog: CHANGELOG.en.md · Agent binaries: agent-v1.4.4

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