A VLESS or Trojan inbound on TCP with TLS or Reality can now act as a
fallback master: pick existing inbounds as children and the panel auto-
fills the SNI / ALPN / path / xver routing fields from each child's
transport, auto-builds settings.fallbacks at config-gen time, and
rewrites the child's client-share link so it advertises the master's
reachable endpoint and TLS state instead of the child's loopback listen.
Layout matches the Xray All-in-One Nginx example: master at :443 with
clients + TLS, each child on 127.0.0.1 with its own transport+clients.
Order matters (Xray walks fallbacks top-to-bottom) — reorder via the
per-row up/down arrows. Path / SNI / ALPN are exposed under a per-row
Edit toggle for the rare cases where the auto-derivation needs
overriding; otherwise just pick a child and you're done.
Backend: new InboundFallback table + FallbackService (GetByMaster /
SetByMaster / GetParentForChild / BuildFallbacksJSON); two routes
(GET / POST /panel/api/inbounds/:id/fallbacks); xray.GetXrayConfig
injects settings.fallbacks for any VLESS/Trojan TCP-TLS/Reality
inbound; GetInbounds annotates each child with FallbackParent so the
frontend can rewrite links without an extra round-trip.
Link projection covers every emission path — clients-page QR/links,
per-inbound Get URL, raw subscription, sub-JSON, sub-Clash, and the
inbounds-page link/info/QR — via a shared projectThroughFallbackMaster
on the backend and a shared projectChildThroughMaster on the frontend
that both handle the panel-tracked relationship and the legacy
unix-socket (@vless-ws) convention.
Strings translated into all 12 non-English locales.
The Port-with-Fallback inbound (commit 62fd9f9d) was confusing as a
standalone protocol — fallbacks belong on a regular VLESS/Trojan TCP-TLS
inbound, the way Xray models them natively. Rip out the entire feature
cleanly (no migration needed since it was never released): protocol
constant, fallback children DB table, FallbackService, 2 API endpoints,
all UI rows, related translations and api-docs. A native fallback flow
attached to VLESS/Trojan TCP-TLS/Reality will land in a follow-up commit.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Lets operators with large client counts or multi-node setups pick PostgreSQL
at install time without breaking the existing SQLite default. Backend is
selected at runtime via XUI_DB_TYPE/XUI_DB_DSN, a small dialect layer keeps
the five JSON_EXTRACT/JSON_EACH queries portable, and a new `x-ui migrate-db`
subcommand copies SQLite data into PostgreSQL in FK-aware order.
