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+# Phase 19.6: Two-factor auth and device flow - Pattern Map
+
+**Mapped:** 2026-10-21
+**Files analyzed:** 38 new or modified files in 6 repos
+**Analogs found:** 36 / 38
+
+Path roots used below (all siblings of `summercms.go`, under `/media/nvme/dev/golem15/summercms.io/summercms/`):
+- `USER` = `fonoteka.go/plugins/golem15/user` (the sm-user-plugin checkout you edit and push from, v0.1.5 / `35cf166`; sociallogin's `go.work` already replaces the module with this path)
+- `SOC` = `sm-sociallogin-plugin` (the template for the new plugin)
+- `MFA` = `sm-mfa-plugin` (new repo, plugin `golem15.mfa`)
+- `DEMO` = `sm-demo-app`, `BM` = `sm-bm-app`, `VDEMO` = `vue-demo-app` (mounted in DEMO as the `vue-demo-app` submodule)
+
+All analog paths are git-tracked in their own repos (checked with `git ls-files`).
+
+## File Classification
+
+### sm-user-plugin (additive seams + device flow)
+
+| New/Modified File | Role | Data Flow | Closest Analog | Match Quality |
+|---|---|---|---|---|
+| `USER/classes/login_gate.go` (new) | service registry | request-response | `USER/classes/oauth_providers.go` (published seam interface) | role-match |
+| `USER/classes/events.go` (mod: `LoginEvent`, `PasswordChangedEvent`, `TwoFactorAdmin` iface) | model/event | event-driven | same file, `DeactivatingEvent` :59-67 | exact |
+| `USER/controllers/registration.go` (mod: `FireLoginEvent`, `FirePasswordChangedEvent`) | utility | event-driven | same file, `FireDeactivatingEvent` :166-171 | exact |
+| `USER/controllers/api_controller.go` (mod: Login gate :86-115, Refresh JTI hand-over :194-211, ResetPassword :327-343 / ChangePassword :580-597 fire hook) | controller | request-response | itself | exact |
+| `USER/controllers/users_admin_controller.go` (mod: `reset_two_factor` action, admin password hook :238-247) | controller (cabana) | CRUD | same file `AdminRecordActions` :662-720 | exact |
+| `USER/controllers/users/config_form.yaml` (mod: `recordActions`) | config | — | itself :17 | exact |
+| `USER/admin_permissions.go` (mod: `golem15.users.reset_two_factor`) | config | — | itself, `manage_privileged_groups` entry | exact |
+| `USER/controllers/devices.go` (new: initiate/status/authorize/list/revoke) | controller | request-response + CRUD | `USER/controllers/api_tokens.go` | exact |
+| `USER/models/device_auth_session.go` (new) | model | CRUD | `USER/models/api_token.go` | exact |
+| `USER/updates/2026102X0001_create_device_auth_sessions.go` (new) | migration | — | `USER/updates/202610040001_create_api_tokens.go` | exact |
+| `USER/classes/device_auth.go` (new: token/short-code gen, hash, state UPDATEs) | service | CRUD | `USER/classes/api_tokens.go` (`MintAPIToken`, `HashAPIToken`) | exact |
+| `USER/routes.go` (mod: 5 device routes) | route | — | itself :17-37 | exact |
+| `USER/config/config.yaml` (mod: `device_auth.auth_url`, ttl) | config | — | itself | exact |
+| `USER/README.md` (mod) | docs | — | itself | exact |
+
+### sm-mfa-plugin (new repo)
+
+| New File | Role | Data Flow | Closest Analog | Match Quality |
+|---|---|---|---|---|
+| `MFA/plugin.go` | plugin entry | — | `SOC/plugin.go` | exact |
+| `MFA/routes.go` | route | — | `SOC/routes.go` | exact |
+| `MFA/buckets.go` (`2fa-verify`) | middleware config | request-response | `sm-oauthserver-plugin/buckets.go` | exact |
+| `MFA/admin_settings.go`, `MFA/admin_permissions.go` | config | — | `SOC/admin_settings.go`, `SOC/admin_permissions.go` | exact |
+| `MFA/config.go`, `MFA/config/config.yaml` | config | — | `SOC/config.go`, `SOC/config/config.yaml` | exact |
+| `MFA/mail.go` + `MFA/views/mail/two_factor_code{,-en}.htm` | config + template | — | `sm-paymentgateway-plugin/mail.go`; template `USER/views/mail/restore-en.htm` | exact |
+| `MFA/boot.go` (listeners: `PasswordChangedEvent`, `DeletingEvent`) | event listener | event-driven | `sm-chatbots-plugin/boot.go` :82-98 | exact |
+| `MFA/classes/gate.go` (implements `userclasses.LoginGate`) | service | request-response | Research Code Example 1 + `SOC/plugin.go` :101 publish | role-match |
+| `MFA/classes/challenge.go` (create, guarded UPDATEs) | service | CRUD | `USER/classes/api_tokens.go` (hash), Research Code Example 2 | role-match |
+| `MFA/classes/totp.go`, `qr.go` | utility | transform | Research Code Examples 3, 4 | no analog (new lib) |
+| `MFA/classes/webauthn.go` | service | request-response | Research Code Examples 5, 6; cooler use from `SOC/classes/codes.go` :171-215 | partial |
+| `MFA/classes/recovery.go`, `email.go`, `trusted.go`, `events.go` | service | CRUD / event | `USER/classes/api_tokens.go`; `USER/classes/events.go` | role-match |
+| `MFA/controllers/helpers.go` | utility | — | `SOC/controllers/helpers.go` :1-26 | exact |
+| `MFA/controllers/challenge.go`, `management.go`, `passwordless.go` | controller | request-response | `USER/controllers/api_tokens.go` (jwt.auth deps), `SOC/controllers/complete.go` (unauth) | exact |
+| `MFA/models/*.go` (5 tables + `Settings`), `MFA/models/registry.go` | model | CRUD | `USER/models/api_token.go`; `SOC/models/settings.go`; `SOC/models/registry.go` | exact |
+| `MFA/models/settings/fields.yaml` | config | — | `SOC/models/settings/fields.yaml` | exact |
+| `MFA/updates/*.go`, `MFA/updates/registry.go` | migration | — | `USER/updates/202610040001_create_api_tokens.go`; `SOC/updates/*` | exact |
+| `MFA/lang/{en,pl}/lang.yaml` | config | — | `SOC/lang/*/lang.yaml` | exact |
+| `MFA/go.mod`, `MFA/go.work` | config | — | `SOC/go.mod`, `SOC/go.work` | exact |
+| `MFA/testmain_test.go`, `MFA/harness_test.go`, `*_test.go` | test | — | `SOC/testmain_test.go`, `SOC/harness_test.go` | exact |
+| `MFA/README.md` | docs | — | `SOC/README.md` | exact |
+
+### sociallogin, apps, frontend
+
+| File | Role | Data Flow | Closest Analog | Match Quality |
+|---|---|---|---|---|
+| `SOC/classes/flow.go` (mod: gate in `signIn` :311-324) | service | request-response | itself + `USER` Login gate | exact |
+| `SOC/classes/codes.go` (mod: `CompletionPayload.Challenge`) | model | — | itself :35-40 | exact |
+| `SOC/controllers/complete.go` (mod: write challenge as 200) | controller | request-response | itself :17-35 | exact |
+| `SOC/models/settings.go` + fields.yaml (or mfa settings: social toggle lives in **mfa** per D-12) | — | — | — | — |
+| `DEMO/summer.yaml`, `DEMO/go.work`, `DEMO/.gitmodules`, `DEMO/plugins.gen.go`, `DEMO/config/golem15.mfa.yaml` | config | — | sociallogin entries in the same files | exact |
+| `DEMO/mfa_test.go` (boot + routes resolve) | test | — | `DEMO/sociallogin_test.go` | exact |
+| `BM/summer.yaml` etc. | config | — | sociallogin entry in `BM/summer.yaml` :6-7 | exact |
+| `fonoteka.go/plugins/golem15/fonoteka/phase07_coverage_test.go` (drop `"/devices"`) | test | — | itself :79-112 | exact |
+| `VDEMO/app/composables/useDemoAuth.ts` (mod: challenge-aware login + verify) | composable | request-response | itself | exact |
+| `VDEMO/app/pages/login.vue` (mod: challenge step) | component | request-response | itself | exact |
+| `VDEMO/app/pages/account/security.vue` (new: TOTP setup/confirm, codes, disable) | component | request-response | `VDEMO/app/pages/login.vue` (form) + `subscriptions.vue` (logged-in gate) | role-match |
+| `VDEMO/app/composables/useTwoFactor.ts` (new) | composable | request-response | `VDEMO/app/composables/useDemoAuth.ts` | role-match |
+| `VDEMO/app/layouts/default.vue` (mod: "Security" link) | component | — | itself :22-25 | exact |
+
+---
+
+## Pattern Assignments
+
+### `USER/classes/login_gate.go` (service registry, request-response)
+
+**Analog:** `USER/classes/oauth_providers.go` :13-31: a seam interface another plugin publishes, documented with the explicit-type-argument warning.
+```go
+// OAuthProviderSource is what a social-login plugin publishes so the user
+// plugin can list its providers ... The user plugin looks it up on every
+// request, so a plugin that boots later is still found.
+//
+// Publish it with an explicit type argument,
+//
+//	app.Publish[classes.OAuthProviderSource](src)
+//
+// because a bare app.Publish(src) keys the service on its concrete type and
+// the lookup misses it (the list then stays empty).
+type OAuthProviderSource interface { ... }
+```
+Lookup side (`USER/controllers/api_controller.go` :236-242):
+```go
+func oauthProviderSource(app *backpack.App) (classes.OAuthProviderSource, bool) {
+	if app == nil {
+		return nil, false
+	}
+	src, ok := app.Lookup[classes.OAuthProviderSource]()
+	return src, ok && src != nil
+}
+```
+Registry body: copy Research Code Example 1 (`LoginGates` with `sync.RWMutex`, `Add`, `Check` fail-closed). The user plugin publishes `*classes.LoginGates` in `Register`; mfa calls `.Add` in `Boot`. `TwoFactorAdmin` (D-15) is a second interface in the same style, published by mfa with `app.Publish[userclasses.TwoFactorAdmin](…)`.
+
+---
+
+### `USER/classes/events.go` + `USER/controllers/registration.go` (events, event-driven)
+
+**Analog event type** (`classes/events.go` :59-67), copy for `PasswordChangedEvent{User, Tx, Source}` and `LoginEvent{User, Source}`; add `LoginEventName`/`PasswordChangedEventName` constants like :8-15:
+```go
+// DeactivatingEvent fires after a user is soft-deleted ... inside the same
+// transaction ... A listener error rolls the deactivation back.
+type DeactivatingEvent struct {
+	User *models.User
+	Tx   *gorm.DB
+}
+```
+**Fire helper** (`controllers/registration.go` :166-171), copy as `FirePasswordChangedEvent` / `FireLoginEvent` (exported so mfa and sociallogin can fire the login event after verify/passwordless):
+```go
+func FireDeactivatingEvent(ctx context.Context, app *backpack.App, user *models.User, tx *gorm.DB) error {
+	if app == nil || app.Events == nil {
+		return nil
+	}
+	return app.Events.Fire(ctx, &classes.DeactivatingEvent{User: user, Tx: tx})
+}
+```
+
+---
+
+### `USER/controllers/api_controller.go` (controller, request-response)
+
+**Login** :47-127. Insert the gate after `CheckAndRecordLogin(…, true)` (:94-101) and before `mintFor` (:115). `fields` is already parsed at :53 (`readFields(r)`), so pass it into `LoginAttempt` (Pitfall 2). Per D-18 A10, **move** the soft-delete restore block (:87-93) after the gate:
+```go
+		if user.DeletedAt.Valid {
+			if err := gdb.WithContext(ctx).Unscoped().Model(user).Update("deleted_at", nil).Error; err != nil {
+				writeOpaque500(w)
+				return
+			}
+			sendTemplateVars(ctx, app, mailName(ctx, user, "golem15.user::mail.reactivate"), user.Email, mailVars(displayName(user), "", ""))
+		}
+		if err := classes.CheckAndRecordLogin(ctx, gdb, user, ip, true); err != nil {
+			...
+		}
+		// <- gate goes here (Research Code Example 1), then the restore block, rehash, TouchLastSeen, mintFor
+		token, err := mintFor(app, secret, user, requestURL(r))
+		...
+		writeJSON(w, http.StatusOK, map[string]any{"token": token, "user": payload})
+```
+Error idiom everywhere: `writeOpaque500(w); return`. Fire `LoginEvent` just before the final `writeJSON`.
+
+**Refresh** :179-213. After `bouncer.Refresh` succeeds, add the JTI hand-over (Research Code Example 8) next to the existing best-effort `TouchLastSeen` block, with the same "log, never fail" idiom:
+```go
+		if sub, _, _, _, err := bouncer.VerifyClaims(next, secret); err == nil {
+			if id, err := strconv.ParseUint(sub, 10, 64); err == nil && id != 0 {
+				if err := classes.TouchLastSeen(r.Context(), gdb, uint(id)); err != nil {
+					slog.Default().Warn("golem15.user: stamp last_seen on refresh", "user_id", id, "err", err)
+				}
+			}
+		}
+```
+`bouncer.VerifyClaims(tokenString, secret) (sub, iat, exp, jti, err)` at `summercms.go/modules/bouncer/jwt.go:194`; `bouncer.Mint(secret, sub, issuerURL, ttl) (token, jti, err)` at `bouncer/mint.go:31`.
+
+**Password-write sites** for `FirePasswordChangedEvent`: ResetPassword :335-343 (`Updates(map[string]any{"password": hashed, "tokens_valid_after": now, "email_verified_at": now})`), ChangePassword :589-597. Wrap the `Updates` + fire in `gdb.Transaction` so a listener error rolls back (Pattern 5). Do **not** fire from the rehash at :102-110.
+
+**Blacklist on revoke** (copy from Logout :137-157):
+```go
+		if bl, ok := app.Lookup[bouncer.BlacklistStore](); ok && bl != nil {
+			if err := bl.Add(r.Context(), jti, exp, time.Now()); err != nil {
+				writeOpaque500(w)
+				return
+			}
+		}
+```
+
+**Mail send helper** :931-943 (`sendTemplateVars`): mfa copies it verbatim with its own log prefix.
+
+---
+
+### `USER/controllers/users_admin_controller.go` + `config_form.yaml` + `admin_permissions.go` (cabana, CRUD)
+
+**Analog:** `AdminRecordActions` :662-720. Add one more entry built like the `action(...)` closure but with `Permissions: []string{PermissionResetTwoFactor}`, `Danger: true`, `Applies` = lookup `classes.TwoFactorAdmin` (false when absent) then `HasTwoFactor`, `Run` = `cabana.TxFromContext(ctx)` then `svc.Reset(ctx, tx, user)`:
+```go
+		return pact.AdminRecordAction{
+			Name:        name,
+			Label:       usersLang + label,
+			Confirm:     usersLang + confirm,
+			Permissions: []string{PermissionAccessUsers},
+			Applies: func(ctx context.Context, record any) (bool, error) { ... },
+			Run: func(ctx context.Context, in pact.AdminRecordActionInput) (pact.AdminRecordActionResult, error) {
+				user, err := asUser(in.Record)
+				...
+				tx, ok := cabana.TxFromContext(ctx)
+				if !ok {
+					return pact.AdminRecordActionResult{}, errors.New("users admin: a record action needs its transaction")
+				}
+				...
+				return pact.AdminRecordActionResult{Message: usersLang + success}, nil
+			},
+		}
+```
+`config_form.yaml` :17 becomes `recordActions: [activate, unban, unsuspend, reset_two_factor]`. Permission entry copies `golem15.users.manage_privileged_groups` in `admin_permissions.go` (no `Roles`). Lang keys go in `USER/lang/*/lang.yaml`.
+
+Admin password change :238-247: `changed, err := c.storePassword(ctx, user)` → when `changed`, fire `PasswordChangedEvent` with `requestDB(ctx, c.db)` as `Tx`.
+
+---
+
+### `USER/controllers/devices.go` (controller, request-response + CRUD)
+
+**Analog:** `USER/controllers/api_tokens.go`.
+
+**Imports** (:3-17):
+```go
+import (
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.golem15.com/golem15/sm-user-plugin/classes"
+	"git.golem15.com/golem15/sm-user-plugin/models"
+	"git.golem15.com/golem15/summercms/modules/backpack"
+	"git.golem15.com/golem15/summercms/modules/bouncer"
+	"git.golem15.com/golem15/summercms/modules/wire"
+	"gorm.io/gorm"
+)
+```
+**Auth deps** (:113-129), reuse for `authorize`, `GET devices`, `DELETE devices/{id}` (routes carry `"jwt.auth"`):
+```go
+func apiTokenDeps(w http.ResponseWriter, r *http.Request, app *backpack.App) (*gorm.DB, *bouncer.Principal, bool) {
+	...
+	db, ok := app.Lookup[*gorm.DB]()
+	...
+	user, ok := bouncer.User(r.Context())
+	if !ok || user == nil || user.ID == 0 {
+		writeUnauthorized(w)
+		return nil, nil, false
+	}
+	return db, user, true
+}
+```
+**List** (:66-85) uses `wire.Slice(data)` for an empty `[]`. **Destroy by id** (:88-111): `strconv.ParseUint(r.PathValue("id"), 10, 64)`, 404 on `gorm.ErrRecordNotFound`, scoped `Where("user_id = ?", user.ID)`. Device `initiate`/`status` are unauthenticated; status uses the guarded `confirmed→used` UPDATE (Research Code Example 7) and mints with `bouncer.Mint` to keep the JTI (`mintFor` discards it).
+
+### `USER/routes.go` (route)
+Add inside the existing `/_user/api/v1` group (:17-37). Keep each `g.Where("id", "[0-9]+")` **directly after** its `{id}` route (Pitfall 17), as at :35-36:
+```go
+		g.Delete("/tokens/{id}", controllers.APITokenDestroy(p.app), "jwt.auth")
+		g.Where("id", "[0-9]+")
+```
+
+### `USER/models/device_auth_session.go` (model)
+**Analog:** `USER/models/api_token.go` :10-50: explicit `gorm:"column:…"` tags, `TokenHash string … json:"-"`, `TableName()`, `Fillable()`, `Hidden()`, `func init() { Register(APIToken{}) }`. Table name `golem15_user_device_auth_sessions`; columns token_hash, short_code, status, user_id, device_name (bounded, Pitfall 14), ip, `jwt_jti`, expires_at, confirmed_at, used_at, last_activity_at.
+
+### `USER/updates/2026102X0001_create_device_auth_sessions.go` (migration)
+**Analog:** `USER/updates/202610040001_create_api_tokens.go` :8-36:
+```go
+var apiTokenMigrations = []*gormigrate.Migration{
+	{
+		ID: "202610040001_create_user_api_tokens",
+		Migrate: func(tx *gorm.DB) error {
+			return tx.Exec(`CREATE TABLE user_api_tokens (
+	id BIGSERIAL PRIMARY KEY,
+	user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	...
+	token_hash VARCHAR(64) NOT NULL UNIQUE,
+	...
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+	updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX user_api_tokens_user_id_index ON user_api_tokens (user_id);`).Error
+		},
+		Rollback: func(tx *gorm.DB) error {
+			return tx.Exec("DROP TABLE IF EXISTS user_api_tokens").Error
+		},
+	},
+}
+
+func init() { Register(apiTokenMigrations...) }
+```
+`user_id` is nullable for device sessions (pending rows have no user).
+
+### `USER/classes/device_auth.go` (service)
+**Analog:** `USER/classes/api_tokens.go` :75-111: `crypto/rand` bytes, hash with `HashAPIToken` (SHA-256 hex = the D-06 `sha256Hex` scheme), never store plaintext:
+```go
+	raw := make([]byte, 32)
+	if _, err := rand.Read(raw); err != nil {
+		return "", nil, err
+	}
+	...
+func HashAPIToken(secret string) string {
+	sum := sha256.Sum256([]byte(secret))
+	return hex.EncodeToString(sum[:])
+}
+```
+Reuse `HashAPIToken` (or an exported alias) for device, challenge and trusted-device tokens instead of a new hash func.
+
+---
+
+### `MFA/plugin.go` (plugin entry)
+
+**Analog:** `SOC/plugin.go`. Copy package doc, the interface assertion block (:26-35, add `pact.HasMailTemplates`, `surf.BucketProvider`), `PluginID` const, `//go:embed config` / `lang`, `Requires() []string{"golem15.user"}` (:72), and the Boot shape that **needs no database** (:91-102; DEMO `boot_test.go` boots without a DB, Pitfall 20):
+```go
+func (p *Plugin) Boot(app *backpack.App) error {
+	p.app = app
+	copyLegacyEnv(app)
+	if _, err := LoadConfig(app); err != nil {
+		return err
+	}
+	return app.Publish[userclasses.OAuthProviderSource](&providerSource{app: app, reg: p.reg})
+}
+...
+func (p *Plugin) Migrations() []*gormigrate.Migration { return updates.All() }
+func (p *Plugin) Models() []any { return models.All() }
+func init() { party.Register(&Plugin{}) }
+```
+mfa's Boot: look up `*userclasses.LoginGates` and `Add` the gate, `app.Publish[userclasses.TwoFactorAdmin](…)`, register listeners. DB, cache and mailer are looked up per request.
+
+### `MFA/routes.go` (route)
+**Analog:** `SOC/routes.go` :12-26:
+```go
+func (p *Plugin) Routes(r pact.Router) error {
+	r.Group("/_user/api/v1", surf.Use("throttle:user-api"), func(g pact.Router) {
+		g.Get("/oauth-complete", controllers.Complete(p.app))
+		...
+	})
+	return nil
+}
+```
+mfa: two groups on `/_user/api/v1/2fa`: challenge + passwordless with `surf.Use("throttle:2fa-verify")`; management routes with `"jwt.auth"` per route (as `USER/routes.go` :33-36) and `g.Where("id", "[0-9]+")` after each `{id}` route.
+
+### `MFA/buckets.go` (`2fa-verify`, 10/min per IP)
+**Analog:** `sm-oauthserver-plugin/buckets.go` :29-111, the per-IP variant at :96-99:
+```go
+var _ surf.BucketProvider = (*Plugin)(nil)
+
+func (p *Plugin) Buckets() map[string]surf.Bucket {
+	trusted := surf.TrustedProxies(nil)
+	if p.app != nil {
+		trusted = surf.TrustedProxies(p.app.Config)
+	}
+	ip := func(r *http.Request) string { return surf.ClientIP(r, trusted) }
+	...
+		BucketMCPRegister: {
+			Name: BucketMCPRegister, Max: 10, Decay: time.Minute,
+			Key: func(r *http.Request) string { return "oauth-mcp-register-ip:" + ip(r) },
+		},
+```
+Bucket names are global; mfa owns `"2fa-verify"`.
+
+### `MFA/admin_settings.go`, `MFA/admin_permissions.go`, `MFA/models/settings.go`, `MFA/models/settings/fields.yaml`, settings migration
+**Analog:** `SOC/admin_settings.go` (whole file), `SOC/admin_permissions.go` (whole file), `SOC/models/settings.go`, `SOC/updates/202610200001_create_golem15_sociallogin_settings.go`.
+```go
+func (p *Plugin) Settings() []pact.SettingsItem {
+	return []pact.SettingsItem{{
+		Code:        SettingsCode,
+		Label:       models.LangPrefix + "settings.label",
+		...
+		Permissions: []string{PermissionAccessSettings},
+		Form:        "models/settings/fields.yaml",
+		NewModel:    func() any { return &models.Settings{} },
+	}}
+}
+```
+Settings model essentials (`SOC/models/settings.go`): singleton `ID` 1, nullable pointer columns where NULL = config default, `TableName`, `Fillable`, `Rules` (`"nullable|max:255"` style), `BeforeValidate` returning `&cabana.ValidationError{Details: map[string]any{"field": []string{"…"}}}` (:84-91; use it for the methods/groups allow-lists), and `LoadSettings(ctx, db)` per request (:129-141):
+```go
+func LoadSettings(ctx context.Context, db *gorm.DB) (*Settings, error) {
+	...
+	var rows []Settings
+	if err := db.WithContext(ctx).Where("id = ?", 1).Limit(1).Find(&rows).Error; err != nil {
+		return nil, fmt.Errorf("golem15.sociallogin: settings: %w", err)
+	}
+	if len(rows) == 0 {
+		return &Settings{ID: 1}, nil
+	}
+	return &rows[0], nil
+}
+```
+Migration seeds row 1: `INSERT INTO … (id, created_at, updated_at) VALUES (1, NOW(), NOW())`, executed through `run(tx, []string{…})` from `SOC/updates/registry.go`. Field types: `dropdown` (mode), `taglist` `mode: array` (methods, groups), `number`, `switch` (Research §Q8). `TOTP secret` column uses `lagoon.Encrypted` with `gorm:"…;type:text" json:"-"` like `SOC/models/settings.go` :39.
+
+### `MFA/models/*.go` + `MFA/updates/*.go` (5 tables)
+Model: `USER/models/api_token.go` (see above). Registry files: `SOC/models/registry.go` and `SOC/updates/registry.go` (whole files, `Register`/`All`, `run` helper). Migration SQL: `USER/updates/202610040001_create_api_tokens.go` style with `REFERENCES users(id) ON DELETE CASCADE`. Table names keep PHP's `golem15_user_*` (D-16).
+
+### `MFA/mail.go` + `MFA/views/mail/two_factor_code{,-en}.htm`
+**Analog:** `sm-paymentgateway-plugin/mail.go` :1-24:
+```go
+//go:embed views/mail
+var mailFS embed.FS
+
+func (p *Plugin) MailTemplatesFS() fs.FS { return mailFS }
+
+func (p *Plugin) MailTemplates() []string {
+	return []string{
+		"golem15.paymentgateway::mail.order.canceled",
+		"golem15.paymentgateway::mail.order.canceled-en",
+```
+mfa lists `golem15.mfa::mail.two_factor_code` and `…-en` (postcard requires the owning plugin prefix, Pitfall 18). Template front-matter from `USER/views/mail/restore-en.htm`:
+```
+subject = "Reset your password"
+description = "Password reset"
+layout = "user"
+==
+Hello **{{ .Name }}**.
+```
+mfa cannot use the `user` layout alias; use the default layout or ship `views/mail/layouts/…` with its own `MailLayouts()`. Pass both cases of vars (`"name"`/`"Name"`, `"code"`/`"Code"`, `"expiry_minutes"`/`"ExpiryMinutes"`) as `USER mailVars` (:924-929) does. Locale: `userclasses.MailTemplate(base, userclasses.ResolveMailLocale(ctx, user))`.
+
+### `MFA/boot.go` listeners
+**Analog:** `sm-chatbots-plugin/boot.go` :82-98:
+```go
+	app.Events.Listen[*userclasses.DeletingEvent](PluginID, p.onUserDeleting)
+...
+func (p *Plugin) onUserDeleting(ctx context.Context, ev *userclasses.DeletingEvent) error {
+	if p == nil || ev == nil || ev.User == nil {
+		return nil
+	}
+	db := ev.Tx
+	if db == nil {
+		db = p.db
+	}
+	...
+	return db.WithContext(ctx).Where("user_id = ?", ev.User.ID).Delete(&models.BotFlag{}).Error
+}
+```
+mfa: `PasswordChangedEvent` → delete trusted devices through `ev.Tx`.
+
+### `MFA/controllers/*.go` (controller, request-response)
+- **Helpers:** copy `SOC/controllers/helpers.go` :22-26 (`writeJSON` with `Cache-Control: no-cache, private` + `wire.WriteJSON`).
+- **Management (jwt.auth):** `USER/controllers/api_tokens.go` `apiTokenDeps` pattern (above). Management errors are PHP's 401 `{"error":"Unauthorized"}`.
+- **Challenge (unauth):** shape of `SOC/controllers/complete.go` :17-35: read input, call a classes function, log with `slog.Default().Error("golem15.mfa: …", "err", err)` + 500 `{"error":"Server error"}`, map not-found to the PHP status.
+- **Token mint after verify:** `usercontrollers.FinishLogin` → `usercontrollers.IssueToken` → `usercontrollers.APIArray` exactly as `SOC/classes/flow.go` :311-324 (`signIn`), then `FireLoginEvent`.
+- **Validation:** 422 `{error, errors}` via a local `writeValidation` copied from `USER/controllers/api_controller.go` :945-950.
+
+### `MFA/classes/webauthn.go` ceremony state in cooler
+**Analog:** `SOC/classes/codes.go` :171-215 (`cooler.FromApp(app)`, `cache.Set(ctx, key, value, ttl)`, `cache.Pull(ctx, key)`, reject `len(code) > 128`). Ceremony state needs no AEAD sealing (it holds no secret), so a plain JSON `Set`/`Pull` suffices.
+
+### `MFA/testmain_test.go`, `MFA/harness_test.go`
+**Analog:** `SOC/testmain_test.go` (TestMain with `flag.Parse()` + `testing.Short()`, `postgres:16-alpine`, `freshDB(t)` at :81-83) and `SOC/harness_test.go` :34-80 (`bootSocialWith`: freshDB → `lagoon.Use` → `httptest.NewUnstartedServer` → temp config dir with `app.yaml` → `party.Activate`). Rename DB/user to `golem15_mfa`. Blank-import `_ "git.golem15.com/golem15/sm-user-plugin"` as SOC does (:22).
+
+### `MFA/go.mod`, `MFA/go.work`
+**Analog:** `SOC/go.work`:
+```
+go 1.27.0
+
+use .
+
+replace git.golem15.com/golem15/summercms => ../summercms.go
+
+replace git.golem15.com/golem15/sm-user-plugin => ../fonoteka.go/plugins/golem15/user
+```
+`SOC/go.mod` requires `sm-user-plugin v0.1.5` and `summercms v0.3.1`; mfa requires the **new** user-plugin tag carrying the seams, plus pquerna/otp v1.5.0, go-webauthn v0.18.2, boombuler/barcode v1.1.0 (after the decision note).
+
+---
+
+### `SOC/classes/flow.go`, `SOC/classes/codes.go`, `SOC/controllers/complete.go` (D-09)
+`signIn` (:311-324) is where the gate goes, before `IssueToken`, with `Source: "social"`, and only when the mfa social toggle is on (the gate itself reads the setting; sociallogin just calls `gates.Check`). `linkIdentity` (flow.go ~:128-165) stays ungated.
+```go
+func signIn(ctx context.Context, app *backpack.App, r *http.Request, db *gorm.DB, user *usermodels.User, action, returnTo string) (Outcome, error) {
+	if err := usercontrollers.FinishLogin(ctx, app, db, user, ClientIP(app, r)); err != nil {
+		return Outcome{}, err
+	}
+	token, err := usercontrollers.IssueToken(app, user, r)
+	...
+	return Outcome{Kind: OutcomeLogin, Token: token, User: payload, Action: action, ReturnTo: returnTo}, nil
+}
+```
+Note: `FinishLogin` restores soft-deleted accounts, so per D-18 A10 the gate must run **before** `FinishLogin`. Add `Challenge map[string]any \`json:"challenge,omitempty"\`` to `CompletionPayload` (codes.go :35-40); in `Complete` (:34), when `p.Challenge != nil`, `writeJSON(w, http.StatusOK, p.Challenge)` instead of `writeSession`.
+
+### DEMO / BM adoption
+- `DEMO/summer.yaml`: add `- id: golem15.mfa` / `module: git.golem15.com/golem15/sm-mfa-plugin` after `golem15.sociallogin` (pattern: existing entries).
+- `DEMO/go.work`: add `./plugins/golem15/mfa` to `use (…)`.
+- `DEMO/.gitmodules`: copy the `plugins/golem15/user` stanza (`url = git@git.golem15.com:golem15/sm-mfa-plugin.git`, `branch = master`); add via `ssu`.
+- Regenerate `plugins.gen.go`/`main.go` with `summer build`.
+- `DEMO/config/golem15.mfa.yaml`: WebAuthn `rp_id`/`origins` override for local use (Pitfall 7; app url is `http://127.0.0.1:8097`, frontend `http://127.0.0.1:3020`).
+- Test: copy `DEMO/sociallogin_test.go` :16-40 (`testConfig` → `backpack.New` → `party.Activate(app, PluginIDs)` → `surf.BuildRouter` → assert `/_user/api/v1/2fa/...` and `/devices` routes resolve).
+- `BM/summer.yaml` :4-7 same entry; bm stays API-only.
+
+### `fonoteka.go/plugins/golem15/fonoteka/phase07_coverage_test.go`
+Remove `"/devices",` from `banned` (:97-105); keep `"2fa"`. Separate pointer-bump commit in fonoteka.go.
+
+### `VDEMO` (D-20)
+**`app/composables/useDemoAuth.ts`** (whole file, 20 lines). Extend `login` to detect `two_factor_required` and return the challenge instead of throwing; add `verify(challengeToken, method, code)` → `POST /_user/api/v1/2fa/verify` and `recovery(challengeToken, code)` → `/2fa/recovery`, both setting `token.value`:
+```ts
+export function useDemoAuth() {
+  const token = useCookie<string | null>(DEMO_TOKEN_COOKIE, { maxAge: 60 * 60 * 24, sameSite: 'lax' })
+  const loggedIn = computed(() => !!token.value)
+
+  async function login(email: string, password: string) {
+    const res = await $fetch<{ token?: string; ... }>(
+      '/_user/api/v1/login',
+      { method: 'POST', body: { email, password } },
+    )
+    const value = res.token ?? res.access_token ?? res.data?.token ?? res.data?.access_token
+    if (!value) throw new Error('No token in the login answer')
+    token.value = value
+  }
+```
+**`app/pages/login.vue`**: keep the `submit`/`busy`/`error` idiom and the `next` redirect guard (:15-22); add a second form shown when a challenge is pending (code input with `autocomplete="one-time-code"`, a "use a recovery code" toggle). Error extraction `e?.data?.message || e?.data?.error`.
+**New `app/pages/account/security.vue`** + **`app/composables/useTwoFactor.ts`**: `$fetch` with `headers: { Authorization: \`Bearer ${token.value}\` }` to `/2fa/status`, `/2fa/totp/setup` (render `qr_code_svg` with `v-html`, the SVG is server-generated), `/2fa/totp/confirm` (show `recovery_codes` from D-19 once), `DELETE /2fa/totp`. Logged-out notice copied from `subscriptions.vue` :21-23. Markup classes: `wrap section section--narrow`, `panel`, `form`, `button`, `form__error`, `notice`.
+**`app/layouts/default.vue`** :22-25: add a `NuxtLink to="/account/security"` next to "Log out". `/_user` is already in `goPaths` in `nuxt.config.ts`, so no proxy change.
+
+---
+
+## Shared Patterns
+
+### JSON responses
+**Source:** `SOC/controllers/helpers.go` :22-26; user plugin `writeJSON`/`writeOpaque500`/`writeUnauthorized`.
+**Apply to:** every mfa and device handler. Timestamps through `wire.Time` (`+00:00`), lists through `wire.Slice`.
+
+### Cross-plugin service seams
+**Source:** `USER/classes/oauth_providers.go` :13-31 and `SOC/plugin.go` :101. Always `app.Publish[Iface](impl)` with the explicit type and look up per request. **Apply to:** `LoginGates`, `TwoFactorAdmin`.
+
+### Typed events
+**Source:** `USER/classes/events.go`, `USER/controllers/registration.go` :129-171, listener `sm-chatbots-plugin/boot.go` :82-98. Events carry `Tx`; listener errors roll the write back. **Apply to:** `LoginEvent`, `PasswordChangedEvent`, all `golem15.user.2fa.*` events (as typed structs with `…EventName` constants).
+
+### Hashed tokens at rest
+**Source:** `USER/classes/api_tokens.go` :75-99 (`crypto/rand` 32 bytes, `HashAPIToken` SHA-256 hex, `token_hash VARCHAR(64) NOT NULL UNIQUE`). **Apply to:** challenge, trusted-device and device-session tokens. Slow hash for recovery/email codes: `bouncer.HashPassword(cost, plain)` / `bouncer.CheckPassword(hash, plain)` with the cost read as in `USER/controllers/api_controller.go` :102-105.
+
+### Guarded single-statement state changes
+**Source:** Research Code Examples 2 and 7 (no existing analog; the user plugin uses read-modify-write). **Apply to:** challenge attempts/completion, recovery consume, device confirm/used, email send count.
+
+### Raw-SQL migrations with registry
+**Source:** `SOC/updates/registry.go`, `USER/updates/202610040001_create_api_tokens.go`. **Apply to:** all six tables. Never GORM AutoMigrate.
+
+### Docker-gated tests
+**Source:** `SOC/testmain_test.go` (flag.Parse + testing.Short). **Apply to:** mfa and user-plugin DB tests.
+
+## No Analog Found
+
+| File | Role | Data Flow | Reason |
+|---|---|---|---|
+| `MFA/classes/totp.go`, `MFA/classes/qr.go` | utility | transform | First use of pquerna/otp and boombuler; use Research Code Examples 3 and 4 |
+| `MFA/classes/webauthn.go` (ceremony logic) | service | request-response | First WebAuthn use; use Research §Q6 and Code Examples 5-6 (only the cooler storage has an analog) |
+
+## Metadata
+
+**Analog search scope:** `fonoteka.go/plugins/golem15/user`, `sm-sociallogin-plugin`, `sm-oauthserver-plugin`, `sm-paymentgateway-plugin`, `sm-chatbots-plugin`, `sm-demo-app`, `sm-bm-app`, `vue-demo-app`, `fonoteka.go/plugins/golem15/fonoteka`, `summercms.go/modules/bouncer`
+**Files scanned:** ~45
+**Pattern extraction date:** 2026-10-21