The mouse drag-to-pan of the zoomed board captured the pointer on the scroll container
(vp.setPointerCapture) and wrote that same element's scrollLeft/Top. On an older
Chromium — the Chrome 74 Android 10 System WebView — capturing the pointer on the very
element being scrolled drops or displaces the capture as the scroll offset changes
mid-drag, so the board juddered under the cursor and would not pan (modern engines
cope).
Track the drag with window pointermove/up/cancel listeners, added on pointerdown and
removed on release, instead of capturing — the same "keep receiving moves past the
element edge" without holding the scroll container. The path is mouse-only (touch
scrolls the overflow viewport natively) and its behaviour on modern engines is
unchanged; svelte-check and the mock e2e (incl. the zoom specs) are green.
Speculative, not locally reproducible (needs Chrome 74): pending the owner's on-device
confirmation. The unrelated auto-zoom-on-placement gap on the same engine is left as-is
(minor).
The board sizes its tile letter/value glyphs (and the blank/bonus marks) in container-
query units (cqw), which are Chrome 105+. On an older engine — e.g. the Chrome 74
Android 10 System WebView — the cqw declaration is invalid and dropped, so the glyph
inherits the .cell `font-size: 0` reset and renders at 0px: the board tiles show empty
while the rack and stats tiles (not under that reset) render fine.
Add a viewport-relative fallback before each cqw font-size — calc(<n>vmin * var(--z, 1))
— which approximates the board-relative size and tracks the zoom (--z), so old WebViews
draw the glyphs; Chrome 105+ still takes the exact cqw line after it. Additive only, no
change on modern engines (verified: mock e2e incl. the board/zoom specs still green).
The landscape board-container sizing (.scaler.land min(100cqw,100cqh)) still relies on
container-query units and is not covered here — portrait (the mobile default under test)
is unaffected by that.
The es2019 + conditional core-js fixes let the module mount on the Chromium 66 in-app
WebView, but the lobby then shows a white screen and a generic "something went wrong"
toast — a caught error that never reaches window.onerror, so the diagnostic ERRORS
panel stayed empty and could not name the cause.
Mirror console.error / console.warn into the panel, and add a temporary, mock-gated
console.error of the raw error (with stack) in handleError, so the on-device panel
shows exactly what threw and whether it is one error or several. Expected: a
ReferenceError from the 64-bit FlatBuffers timestamp decode (BigInt, absent on Chrome
66 and not polyfillable by core-js) — to be confirmed on-device before deciding the
support floor.
Temporary — both hunks revert together with the index.html BOOT-DIAG block.
The es2019 down-level fixed the parse error, but the Chromium 66 in-app WebView
(Android 9) then threw "Uncaught ReferenceError: globalThis is not defined" — esbuild
lowers syntax, not the es2020+ runtime globals the bundle and its deps reference
(globalThis, structuredClone, Array.at, Object.hasOwn, Promise.allSettled, …), so the
module still failed to evaluate and the SPA stayed a white screen.
Load core-js only where it is actually missing. A permanent ES5 gate in index.html
feature-detects the engine and, on an old one, document.writes a parser-blocking
<script src=polyfills.js> before the deferred module runs; a modern engine matches
none of the checks and downloads nothing. document.write is used deliberately — it is
the only way to inject a script guaranteed to run before a deferred module — with a
static literal argument (no interpolation, no injection surface). vite.config
emitPolyfills writes dist/polyfills.js from the prebuilt core-js-bundle and keeps it
out of the module graph, so the bundle-size budget is unaffected (app entry still
108.8 / 110 KB gzip).
pnpm-workspace denies core-js-bundle's install script (the package ships a prebuilt
minified.js we only read at build time; its script is a funding banner). svelte-check
and the mock e2e (Chromium + WebKit) are green and the size gate still passes. The
on-device re-test on the Chromium 66 emulator is pending.
The es2022 build target shipped optional chaining / nullish coalescing verbatim
(esbuild does not down-level syntax below the configured target), so an old Android
System WebView — captured as Chromium 66 in the Telegram/VK in-app WebView on Android
9, via the boot diagnostic — rejected the bundle with "Uncaught SyntaxError:
Unexpected token ?" at main-*.js:2, the module never ran (no .app-shell, #app empty)
and the SPA showed a white screen. Firefox/Gecko on the same device, which ships its
own current engine, rendered the SPA fine.
Lower build.target to es2019 so esbuild down-levels the es2020+ syntax the old engine
cannot parse (?., ??, private fields, static blocks, numeric separators). Verified the
emitted main bundle no longer contains ?./?? and the mock e2e (Chromium + WebKit)
still passes. The boot-diagnostic JS-SYNTAX header is relabelled accordingly.
esbuild lowers syntax only, not runtime APIs; the app's own production source uses
none beyond this floor (mock-only helpers are tree-shaken). A graceful "update your
WebView" fallback and any runtime-API polyfills follow once the on-device re-test
confirms the parse fix (and @vitejs/plugin-legacy stays in reserve for even older
engines).
Add a classic ES5 <script> to index.html, before the ES2022 module bundle, that
renders an on-screen diagnostic overlay. It runs and paints even when the bundle
fails to parse on an old Android System WebView (the Telegram/VK in-app case we are
chasing: Firefox/Gecko renders the SPA on the same device, the in-app WebView shows
only a white screen).
The overlay installs error capture first (so a module SyntaxError / load failure /
unhandled rejection is printed), then reports the engine (userAgent + Chromium
version), the JS syntax and Web API support the es2022 bundle needs — each row dated
by the Chrome version that shipped it, so the first failing row dates the engine —
and whether the module ran (<html> gets .app-shell) and Svelte mounted (#app has
children). A verdict flags the likely cause; a Copy button exports the report.
vite.config.ts strip-boot-diag removes the whole BOOT-DIAG block from every
non-production build, so the mock e2e (whose first taps a full-screen overlay would
intercept) and the dev server stay clear; only the production build shipped to the
test contour carries it.
Temporary: revert this commit (the index.html block and the plugin) after the
diagnosis. It must never reach master / production.
The first v1.8.0 prod-deploy build job failed: `docker compose build` interpolates the
WHOLE compose file, and the backend's :?-guarded EXPORT_SIGN_KEY — added with the
finished-game export after the last prod release (v1.7.0), so the prod build never
exercised it — was absent from the build job's env, tripping the guard before any image
built. Prod was untouched (build-only failure: no image pushed, no deploy, no migration).
Add EXPORT_SIGN_KEY (audited every :?-guarded compose var against the build job env — it
was the only genuinely-missing one; TELEGRAM_MINIAPP_URL is derived in the run step).
Verified by reproducing the build-job env + `docker compose config`.
The maintenance overlay never showed on the test contour: only prod-deploy.sh raised
the caddy maintenance flag, so a test redeploy was a bare gateway/backend recreate — the
SPA saw a transient 502 ("Reconnecting…"), never the 503 + X-Scrabble-Maintenance marker
the overlay keys on. So the feature (PR #171) was unverifiable off prod.
Raise the flag around the recreate in ci.yaml's deploy job too, mirroring prod. Ordering
matters because of the config reseed: ci does `rm -rf $conf` + recreate, so the running
caddy sits on the stale pre-reseed bind mount and cannot see a flag written to the new
dir until it is recreated. So: raise the flag, force-recreate caddy FIRST (onto the fresh
mount, where it carries the flag and 503s), then recreate gateway/backend (the window),
then the other config services, then lower it. A trap clears the flag if the step fails,
and the next deploy's reseed wipes a stale one — so the contour can't stick in maintenance.
The caddy-routed probes run in the next step, after the flag is lowered.
Prod was already correct (prod-deploy.sh); this only makes the test contour faithful so the
overlay + reload can be seen there. An open SPA must already be on the PR-#171 bundle (which
carries the overlay code) — reload once to bootstrap onto it.
The deploy that ends a maintenance window may ship a client-incompatible change
(wire/schema bump), and the in-session bundle is the old one. On recovery, reload to
pick up the fresh client instead of just hiding the overlay. Ordering is safe: the edge
maintenance flag (deploy/prod-deploy.sh) spans the WHOLE roll and clears only at script
exit — after the gateway (which serves the embedded SPA) has rolled — so the edge 503s
everything until the entire deploy is live; recovery therefore always serves the new SPA.
A window.__maint.recover() hook + e2e cover the reload.
The edge caddy 503 carries X-Scrabble-Maintenance during a deploy window, but a user
already in the running SPA only sees their calls start failing — the static caddy page
catches only a fresh load. Detect that marker (strictly — not any transient
'unavailable', which the Connecting indicator already covers) on the raw ConnectError at
the two transport catch sites (unary exec + the live subscribe stream), before
toGatewayError discards the response headers, and raise a non-dismissable dimmed overlay
that mirrors the static caddy page. It self-clears: a capped-backoff poll (a cheap read,
mirroring connection.svelte.ts) lifts it on the first success, and a manual "retry"
button forces an immediate re-check — so it can never get stuck. On detection the read
retry loop fails fast, so a window doesn't burn the retry budget on every call.
- pure detector maintenance.ts (maintenanceRetryMs / parseRetryAfterMs) + unit tests;
the store + self-clearing poll in maintenance.svelte.ts (mirrors connection.svelte.ts)
- MaintenanceOverlay.svelte (clones Splash's fixed/inset/dimmed shell, non-dismissable),
mounted app-global in App.svelte after Coachmark
- transport.ts detects + reports at both catch sites, clears on any successful read
- i18n RU "Технические работы" / EN "Under maintenance"; a window.__maint mock hook
(the mock can't emit a real 503) + a Playwright spec
Prod is same-origin (VITE_GATEWAY_URL empty) so the marker header is readable without a
CORS expose-header. Verified: pnpm check (0), unit (402), build, e2e (186, Chromium+WebKit).
Two prod-deploy hardening measures (owner-requested):
- Swap file (Ansible common role, swap_size=1G, vm.swappiness=10). The per-container
memory caps enforce that one service can't eat all RAM, but they overcommit the
1.9 GiB main host (~2.8 GiB of caps), so a simultaneous spike could hit the kernel
OOM-killer (and it might pick postgres). A small swap absorbs the overshoot.
Idempotent, builtin-only (no ansible.posix).
- Edge maintenance page. prod-deploy.sh raises a flag around the rolling swap /
migration window that the caddy edge serves a static 503 "технические работы" page
from (deploy/caddy/maintenance.html), for the user-facing routes only — /_gm
(Grafana) stays reachable. Cleared on any exit (success, health failure + rollback,
or error) by a shell trap so it can never stick on. The 503 carries Retry-After +
an X-Scrabble-Maintenance marker so a follow-up SPA overlay can tell a planned
window apart from a transient error (the static page only catches a fresh load; an
in-session user needs the app-side overlay). Not zero-downtime — the single
stateful backend still blips — but the window is graceful instead of raw 502s.
Verified: caddy validate; the gate 503s every non-/_gm path incl. the Connect/gRPC
edge and serves the page + markers; /_gm bypasses; toggling needs no reload
(per-request stat). Ansible --syntax-check + compose config (base+prod) pass.
The planted honeytoken bearer trap already existed in the gateway + compose, but
no workflow fed GATEWAY_HONEYTOKEN, so it was always empty (inert). Wire the
per-contour TEST_/PROD_GATEWAY_HONEYTOKEN secret into the ci deploy, prod-deploy
and prod-rollback env (the prod path via the shared deploy/write-prod-env.sh),
document it (deploy/README + .env.example), and fix the stale compose comment.
Empty secret = trap off (no ":?" guard), so a deploy is safe before the operator
sets the value + plants the bait. On prod (IP ban on) presenting it earns a 24h
ban + alarm; on test (ban off) it logs + a ban metric.
GF_SMTP_ENABLED is enabled separately via the TEST_/PROD_GF_SMTP_ENABLED Gitea
variables (=true) — no code change.
Collapse identical TEST_/PROD_ pairs to single unprefixed Gitea entries, derive
the public URLs from PUBLIC_BASE_URL at deploy time, and share the prod env.sh
renderer between deploy and rollback.
- Collapse to one unprefixed variable: DICT_VERSION, SMTP_RELAY_HOST/PORT/TLS,
GRAFANA_SMTP_PORT, VITE_VK_APP_LINK, VITE_VK_APP_ID (one Selectel relay + one
pair of VK apps serve every contour). Secrets collapsed by the owner:
SMTP_RELAY_USER/PASS, GATEWAY_VK_APP_SECRET, GATEWAY_VK_ID_CLIENT_SECRET.
- Derive at deploy from PUBLIC_BASE_URL (no longer stored): TELEGRAM_MINIAPP_URL,
GRAFANA_ROOT_URL, VITE_VK_ID_REDIRECT_URL. Removes the prod/test asymmetry and
fills the missing test VITE_VK_APP_ID (VK web login was half-configured on test).
- Extract deploy/write-prod-env.sh + write-prod-bot-env.sh, shared by prod-deploy
and prod-rollback so the two cannot drift: a rollback now re-renders the FULL
runtime env (email / VK login / Grafana alerts previously went dark after a
rollback) and passes TELEGRAM_SUPPORT_CHAT_ID.
- Single-source DICT_VERSION (CI env + both deploys), fix the v1.3.0/v1.3.1 drift in
.env.example/README, correct the misleading honeytoken/abuse-ban compose comment,
and rewrite the deploy/README variable list (+ the previously undocumented
GATEWAY_VK_APP_SECRET and TELEGRAM_SUPPORT_CHAT_ID).
The Gitea variables are reworked via the API; the stale TEST_/PROD_ entries are
deleted after the test contour goes green.
An account merge blanket-reassigned all of the secondary's identities to the primary,
so merging two accounts that each had a confirmed email (or telegram/vk) left the
survivor with two identities of one kind — which the profile and the retention dossier
both treat as singular (the profile showed an arbitrary one; a later change-email
journaled only one). The merge now keeps the primary's identity and journals the
secondary's colliding one to retained_identities (reason=merge) before dropping it, so
the survivor has one identity per kind and the absorbed credential still lands in the
legal dossier.
- migration 00008: widen retained_identities.reason CHECK to admit 'merge'
(expand-contract — Up only widens the set, so an image rollback stays DB-safe).
- accountmerge: dedupeIdentities + retainMergedIdentity before the identity reassign.
- inttest TestAccountMergeDedupesEmail; docs ARCHITECTURE §4 + retention.go reason note.
A browser has no signed VK Mini App launch params, so linking VK on the web uses
VK ID's raw OAuth 2.1 flow (PKCE, no @vkid/sdk): the SPA redirects to VK's hosted
login and returns with an authorization code, which the gateway exchanges
server-side (confidential, under the VK "Web" app's protected key) for the trusted
vk user id — then the existing link/merge machinery attaches or merges it.
- fbs LinkVKRequest{code, device_id, code_verifier}; codec + TS bindings.
- backend link.Service ConfirmVK/MergeVK/attachVK (KindVK, mirror Telegram),
handleLinkVK[Merge], routes /user/link/vk[/merge], backendclient LinkVK[Merge].
- gateway internal/vkid confidential code exchange (id.vk.com/oauth2/auth);
transcode link.vk.confirm/merge (registered only when configured) + config
GATEWAY_VK_ID_{APP_ID,CLIENT_SECRET,REDIRECT_URL} + main wiring.
- UI lib/vkid (PKCE authorize redirect + callback), Profile "Link VK" control,
boot callback handling; a merge re-authorizes for a fresh code (VK codes are
single-use). Web-only (a redirect strands a Mini App webview).
- Deploy: VITE_VK_APP_ID + VITE_VK_ID_REDIRECT_URL build args + gateway env,
ci.yaml/prod-deploy TEST_/PROD_ vars, compose/Dockerfile/.env.example/README.
- Tests: vkid exchange unit (string/number user_id, id_token fallback, errors),
transcode link.vk, backend ConfirmVK/MergeVK inttest, codec encodeLinkVK.
- Docs: ARCHITECTURE §4, FUNCTIONAL(+ru), gateway README.
Two contour-deploy failures from PR4: (1) the deploy did not stage deploy/blackbox/, so
blackbox_exporter crash-looped on a missing config mount — add blackbox to the ci.yaml cp
and the prod-deploy tar; (2) Grafana rejects the 'Name <addr>' From form the backend go-mail
accepts and validates it even when SMTP is disabled, crash-looping Grafana — the deploy now
splits SMTP_RELAY_SERVICE_FROM into a bare GF_SMTP_FROM_ADDRESS + GRAFANA_SMTP_FROM_NAME
(handles both display and bare forms). Verified the sed split + compose render.
Drop the separate GRAFANA_SMTP_HOST (it duplicated SMTP_RELAY_HOST): Grafana differs from
the backend only in needing the STARTTLS port, so GF_SMTP_HOST is composed from
SMTP_RELAY_HOST + GRAFANA_SMTP_PORT (an explicit per-contour var, no magic default), reusing
SMTP_RELAY_USER/PASS. Wired through ci/prod/.env.example/README.
§11 gains the alerting layer: Grafana infra rules (scrape-down, edge error-rate/p99, host
mem/disk/cpu, postgres connections, TLS cert < 20d via blackbox), noDataState=OK, and the
backend admin-alert worker (coalesced email on new feedback / complaints).
Grafana: GF_SMTP from the shared relay (STARTTLS host:port) + alerting provisioning
(contact point → SERVICE_EMAIL, route-all policy, and rules for scrape-target down,
gateway internal-error rate + p99 latency, host mem/disk/cpu, postgres connections, and
TLS cert < 20 days). All rules noDataState=OK so an absent metric never false-alerts.
blackbox_exporter probes the edge caddy's TLS (probe_ssl_earliest_cert_expiry) — effective
on prod (caddy terminates TLS; contour caddy is HTTP-only so the metric is absent).
Wires the new env through compose (backend admin From/To, Grafana SMTP), ci.yaml (TEST_),
prod-deploy (PROD_ + env.sh), .env.example and the README var table.
New adminalert worker polls for feedback + word complaints arriving since the last check
and coalesces a burst into one digest email per interval (5 min), inert unless a distinct
admin sender (BACKEND_SMTP_ADMIN_FROM) and recipient (BACKEND_ADMIN_EMAIL, comma-separated
allowed) are configured. The mailer gains a per-message From override and splits a
comma-separated To into separate recipients (go-mail needs them as a list). Feedback/game
stores gain CountSince/CountComplaintsSince. Unit tests cover the digest, the skip-when-
empty, and the recipient split.
The email/name/external-id search was scoped to one tab and only looked in the live
identities table, so a deleted account (whose credentials moved to retained_identities on
deletion) could not be found by the email/id it held. Now a people search spans live and
deleted accounts in one query (robots only on the Robots tab) and also matches the
retention journal and the retained real name; results carry a 'deleted' badge. Integration
test: a deleted account is found by its held email and external id.
- Admin /users gains a Deleted scope (between People and Robots); every other scope now
hides tombstoned accounts (deleted_at filter in UserFilter).
- Admin delete-user is offered for any non-deleted account (drop the not-guest gate, so a
stale is_guest account can still be tombstoned).
- Harden EmailService.ConfirmCode to ClearGuest — defence-in-depth so no confirmed-email
path leaves is_guest set (the currently-live paths already do).
- Space the delete/change dialog's action row from its input field.
Integration tests: the Deleted filter scoping + ConfirmCode guest promotion.
FUNCTIONAL (+ru): the deletion user story — anonymised live surfaces ([Deleted]),
freed sign-in methods, a two-year-retained dossier, the code/phrase step-up, game
forfeit + all-robot drop, fresh account on reopen. ARCHITECTURE: the retention model
(retained_identities journal on every detach, tombstone + [Deleted] sentinel, drop
all-robot games, purpose=delete step-up, cold-load last-login, two-year TTL reaper).
The user-detail console gains a Deletion & retention panel: last login (time + IP),
the tombstone (deleted-at + retained real name), and the retention journal (the legal
dossier of detached credentials). A Delete-user action runs the same deletion
orchestration as the in-app flow (mirrors the email-erase pattern). Store readers
RetainedIdentities + DeletionInfo back the view; integration test covers them.
Profile gains a Delete-account control (durable accounts) opening a step-up dialog: a
mailed code for an email account, or the typed DELETE phrase for a platform-only one.
On success the app swaps to a terminal AccountDeleted screen ('Учётная запись удалена')
with a Close that closes the host Mini App (telegramClose / vkClose; web = no close).
Wires deleteRequest/deleteConfirm through client/transport/mock/codec; ru/en i18n;
codec wire test + Chromium/WebKit e2e.
Step-up: email accounts confirm with a mailed code (purpose=delete, no deeplink —
ConfirmByToken refuses a delete token so a stray click can't delete); platform-only
accounts type a fixed phrase (anti-impulse). Endpoints /user/delete/{request,confirm};
the confirm orchestration resigns active games, drops all-robot games, tombstones +
anonymizes the account (freeing its creds), and revokes its sessions — the tombstone is
the point of no return, the rest best-effort. Gateway account.delete.{request,confirm}
ops + fbs AccountDeleteConfirm/AccountDeleteRequestResult + branded ru/en delete email.
Integration tests cover the step-up (code + no-email) and the orchestration pieces.
Q2=B: DropAllRobotGames deletes the deletee's games with no human opponent (vs-AI or
auto-match-robot; children cascade), keeping games with any human seat (anonymized
instead). Q1=A: the anon label is the sentinel [Deleted] — the editable-name rule forbids
brackets, so no live player can impersonate a deleted account. Integration test covers
drop-vs-keep.
Daily background reaper purges the deletion dossier past its two-year TTL: every
retained_identities row by detached_at (covering unlink/change on live accounts too),
and — for accounts tombstoned before the cutoff — the retained feedback thread plus the
dossier PII (deleted_display_name, last_login_ip). Chat is kept (a shared game artifact)
and the tombstone row stays. Started from main next to the guest reaper. Integration
test covers the cutoff boundary and the deleted-account feedback/PII purge.
New accountdelete package: AnonymizeAndTombstone journals every credential to the
retention log (reason=delete) then removes them (freeing email/vk/tg for reuse),
snapshots the real display name into deleted_display_name and scrubs the live one to
'Удалённый игрок', sets deleted_at, anonymizes the account's game-seat snapshots, and
drops its friendships/blocks/invitations/friend-codes/drafts/pending-codes — all in one
transaction. Chat, feedback and complaints are kept (the tombstone keeps their
no-cascade FKs valid). Session revocation + game forfeit are orchestrated a layer up.
Integration test covers journalling, tombstone/scrub and credential reuse.
The profile GET (fetched once per cold app-load by the SPA) stamps accounts
.last_login_at/.last_login_ip, throttled to at most once per hour per account
(best-effort, never blocks the read). IP from the gateway-forwarded X-Forwarded-For.
Feeds the account-deletion dossier. Integration test covers the throttle.
On unlink (RemoveIdentity, reason=unlink) and email change (replaceEmailIdentity,
reason=change) write the outgoing credential to retained_identities before removing
the live identities row — so the legal dossier survives while the (kind, external_id)
frees for reuse. Same transaction, so the dossier and live state cannot diverge.
Integration tests cover both reasons.
Additive/expand-contract: new append-only retained_identities table (the legal
dossier of every detached credential, keyed by account_id, TTL'd by detached_at)
plus nullable accounts columns last_login_at/last_login_ip (cold-load stamp) and
deleted_at/deleted_display_name (tombstone + retained real name). Regenerates the
go-jet models for accounts + retained_identities only.
Replace the stale skipped linking specs: change-email refuses a taken address with
the non-disclosing message (never revealing the other account) and replaces a free
one; the web Telegram link control links then unlinks through the confirm dialog.
Chromium + WebKit.
FUNCTIONAL (+ru): drop the stale 'linking UI hidden' note; document the profile
sign-in-methods matrix, the unlink last-identity guard, and the non-disclosing
atomic email change. ARCHITECTURE: unlink + change-email behaviour and the
purpose=change deeplink branch.
Integration: unlinking a provider keeps the other identities and refuses removing
the last one; change-email replaces the address (freeing the old), refuses a taken
address without merging, and works through the one-tap deeplink token. Unit: the
change-email template renders localised ru/en copy.
Profile shows the account's sign-in methods for guests and durable accounts alike:
add or change email, link Telegram on the web (login widget), and unlink a linked
provider. Email is never unlinked (it is changed); unlink is offered only when
another identity remains, and a change to an address owned by another account shows
the non-disclosing 'check the address or contact support'. Add-VK-on-web stays
deferred (no VK OAuth).
Wires linkUnlink / changeEmailRequest / changeEmailConfirm through the client,
transport, mock and codec (encodeLinkUnlink + LinkResult 'unlinked'/'changed'
statuses); codec wire tests; ru/en i18n.
Unlink: POST /user/link/unlink (telegram|vk) via account.RemoveIdentity, refusing
the last identity; email is never unlinked. New fbs LinkUnlinkRequest + gateway
link.unlink op, returning the refreshed profile.
Change-email: purposeChange confirm-codes (RequestChangeCode/ConfirmChange) that
atomically replace the account's confirmed email (account.replaceEmailIdentity);
a new address owned by another account is refused without disclosure, never merged.
The one-tap deeplink handles purposeChange too. Reuses the LinkEmail* fbs tables;
gateway link.email.change.{request,confirm} ops + backendclient methods; branded
ru/en change-email copy.
Ilia Denisov
developer