diff --git a/CLAUDE.md b/CLAUDE.md
index ba5e065..327bd67 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -30,7 +30,7 @@ Frontend (`mykindlebox/client`):
 - `npm run build` — production build to `dist/`
 - `npm run lint` — ESLint
 
-Deployment: `docker compose up --build` from `mykindlebox/` serves the app on port 8080 by default (nginx serves the built client and reverse-proxies `/api` + `/uploads` to the Node server). Configure via `mykindlebox/.env`: `MYKINDLEBOX_PORT` overrides the host port, and `MYKINDLEBOX_PASSWORD` requires a login (if unset, auth is disabled).
+Deployment: `docker compose up --build` from `mykindlebox/` serves the app on port 8080 by default (nginx serves the built client and reverse-proxies `/api` + `/uploads` to the Node server). `MYKINDLEBOX_PORT` in `mykindlebox/.env` overrides the host port. Auth is account-based (first visit shows a one-time account-creation screen; more users added in Settings) — the old `MYKINDLEBOX_PASSWORD`/`AUTH_PASSWORD` env var is retired and ignored.
 
 ### Conventions
 
@@ -39,7 +39,7 @@ Deployment: `docker compose up --build` from `mykindlebox/` serves the app on po
 
 ## What MyKindlebox is
 
-A self-hosted rabbitry (rabbit breeding herd) management web app, replacing an existing PHP app (`belowland.com/rabbitsite`). It is single-user, self-hosted, and out of scope for v1 includes multi-tenancy, public listing pages, show tracking, and payments.
+A self-hosted rabbitry (rabbit breeding herd) management web app, replacing an existing PHP app (`belowland.com/rabbitsite`). It is self-hosted with **shared-herd user accounts** (users are separate logins to the same rabbitry — see `memory-bank/FEATURE_User_Accounts.md`; everyone equal, no roles). Out of scope: multi-tenancy (per-user herds), public listing pages, and payments.
 
 The core differentiator: **adding a rabbit starts from a pedigree tree, not a blank form** — the 3-generation ancestor tree (sire/dam, their sires/dams) is the primary data-entry surface, with inline autocomplete search against existing herd records and graceful fallback to freeform text for unknown/bought-in ancestors.
 
@@ -53,7 +53,7 @@ The core differentiator: **adding a rabbit starts from a pedigree tree, not a bl
 | Styling | Tailwind CSS with custom theme tokens |
 | Backend | Node.js + Express (REST API) |
 | Database | SQLite via Drizzle ORM (single-file DB) |
-| Auth | Single-user session token (no OAuth) |
+| Auth | User accounts, shared herd (scrypt + SQLite sessions, no OAuth) |
 | Hosting | Docker Compose (Nginx + Node + SQLite volume) |
 
 ## Data model
diff --git a/memory-bank/FEATURE_User_Accounts.md b/memory-bank/FEATURE_User_Accounts.md
new file mode 100644
index 0000000..26bf2e9
--- /dev/null
+++ b/memory-bank/FEATURE_User_Accounts.md
@@ -0,0 +1,89 @@
+# Feature: User Accounts & Onboarding
+
+Replaces the single shared-password auth (`AUTH_PASSWORD` env var, in-memory
+session Set) with real user accounts. Decided with the user on 2026-07-02.
+
+## Scope decisions (user-confirmed)
+
+| Question | Decision |
+|---|---|
+| Data scope | **Shared herd** — users are separate logins to the same rabbitry. No ownership columns on rabbits/litters/shows; nothing about the data model changes. |
+| Account creation | **In-app, no self-registration** — a fresh install shows a one-time "create your account" setup screen; after that, any signed-in user can add more users from Settings. No email/invite infrastructure. |
+| Roles | **Everyone equal** — no admin flag. Any user can manage users and settings. (Trust model: family/partners on a LAN.) |
+| Onboarding extras | **Per-user preferences only** — `theme` and `weight_unit` become per-user; `rabbitry_name`, `kit_prefix`, `default_breed` (and the internal `kit_counter`) stay global. No first-run settings wizard, no guided tour. |
+
+## Consequences to be aware of
+
+- **Auth becomes mandatory.** Today, unset `AUTH_PASSWORD` = open access. After
+  this feature, a fresh install requires creating an account, and every request
+  requires a session. The "no password = open" mode is retired.
+- **`MYKINDLEBOX_PASSWORD` / `AUTH_PASSWORD` is retired.** Removed from
+  docker-compose and the README. An existing deployment that upgrades sees the
+  setup screen on next visit (its `users` table is empty); herd data is
+  untouched. The old env var is simply ignored.
+- Because you must be signed in to delete a user and you **cannot delete
+  yourself**, the last account can never be deleted — no lockout state exists.
+
+## Data model
+
+```
+users:
+  id             integer PK autoincrement
+  username       text NOT NULL UNIQUE COLLATE NOCASE
+  password_hash  text NOT NULL        -- "scrypt:<salt hex>:<hash hex>"
+  theme          text                 -- NULL = inherit global settings value
+  weight_unit    text                 -- NULL = inherit global settings value
+  created_at     text NOT NULL default current_timestamp
+
+auth_sessions:
+  token       text PK                 -- randomUUID
+  user_id     integer NOT NULL FK -> users.id ON DELETE CASCADE
+  expires_at  text NOT NULL           -- ISO; 30 days from login
+  created_at  text NOT NULL default current_timestamp
+```
+
+Sessions move from the in-memory Set to SQLite so a server restart/redeploy no
+longer signs everyone out. Expired rows are deleted lazily whenever a session
+check touches them. Deleting a user cascades their sessions (they're signed out
+everywhere immediately).
+
+## Password hashing
+
+`node:crypto` `scryptSync` (N=16384 default params), 16-byte random salt,
+64-byte key, stored as `scrypt:<salt>:<hash>`; verified with `timingSafeEqual`.
+Deliberately **not** bcrypt/argon2 — no new native dependency, so the Alpine
+Docker build stays exactly as it is. Failed logins get a flat ~350 ms delay as
+cheap brute-force damping.
+
+## API
+
+- `GET  /api/auth/status` → `{ configured, authenticated, user? }` —
+  `configured` now means "at least one user exists". `user` = `{ id, username }`
+  when authenticated.
+- `POST /api/auth/setup` `{ username, password }` — creates the **first** user
+  and signs them in; 409 once any user exists. This is the onboarding endpoint.
+- `POST /api/auth/login` `{ username, password }` (username case-insensitive).
+- `POST /api/auth/logout` — deletes the session row.
+- `GET    /api/users` → `[{ id, username, created_at }]` (no hashes).
+- `POST   /api/users` `{ username, password }`.
+- `PATCH  /api/users/:id` `{ password }` — reset any user's password (everyone
+  equal; family trust model — also the "someone forgot theirs" path).
+- `DELETE /api/users/:id` — 400 when `id` is the caller.
+- **`/api/settings` keeps its exact shape**: GET merges the global rows with the
+  current user's non-NULL `theme`/`weight_unit` overrides; PATCH routes those two
+  keys to the user row and everything else to the settings table. Client
+  consumers (ThemeSync, useWeightUnit, Settings page) need no changes for prefs.
+
+## Client
+
+- `AuthProvider` gains a third gate: `configured: false` → `SetupScreen`
+  (create first account), else unauthenticated → `LoginScreen` (now
+  username + password), else app. Context exposes `{ user, logout }`.
+- Settings gets a **Users** card: list users, add user, reset password, delete
+  (self-delete disabled). The Account card shows who is signed in.
+- Password minimum: 8 chars, enforced on both setup and user creation.
+
+## Out of scope (deliberate)
+
+Roles/permissions, invite links, email anything, per-user data visibility,
+password-strength meters, 2FA, audit logs.
diff --git a/memory-bank/architecture.md b/memory-bank/architecture.md
index 2af9b11..a1ebf54 100644
--- a/memory-bank/architecture.md
+++ b/memory-bank/architecture.md
@@ -19,7 +19,7 @@ docker-compose.yml — orchestrates both services for self-hosted deployment
 |---|---|
 | `index.ts` | Entry point. Creates the Express app, applies `cors()` (allow-all — added in Phase 4 Step 4.3 so the Vite dev server on port 5173 can call this API cross-origin; revisit with a stricter allowlist once auth exists) and `express.json()`, imports `db/client` (so the DB connection/file is initialized on startup), mounts all routers, and starts listening on port 3001. |
 | `db/client.ts` | Opens the SQLite connection and exports the Drizzle `db` instance used by all query code. Ensures `server/data/` exists before opening the file — `better-sqlite3` will not create missing parent directories on its own. The DB file lives at `server/data/mykindlebox.db`. On startup it now (Step 2.5) calls `drizzle-orm/better-sqlite3/migrator`'s `migrate()` to apply any pending migrations, then seeds the two default `settings` rows (`rabbitry_name`, `weight_unit`) via raw `INSERT OR IGNORE` keyed on the `key` primary key — idempotent across restarts. Also exports `dataDir` and `uploadsDir` (`data/uploads/`, created here) so other modules (`routes/rabbits.ts`'s multer config, `index.ts`'s static file serving) share one canonical path instead of each recomputing it. |
-| `db/schema.ts` | Drizzle schema definitions: `rabbits` (24 base fields incl. `acquired_date`/`death_date` — the two timeline anchors that aren't derivable, see the rabbit-timeline note below; 7 genetics loci columns, 14 chain-authority `_name_text` ancestor columns; `sex`/`status` enforced via SQLite `CHECK` constraints, not just TS union types; `sire_id`/`dam_id` self-referencing FKs), `litters` (`sire_id`/`dam_id` FKs to `rabbits.id`, `breed_date`, `kindle_date`, `kit_count`, `notes`, `created_at` — a litter row spans the breeding→kindle lifecycle: `breed_date` is set when a breeding is recorded, `kindle_date` is nullable until the doe kindles; at least one of the two is required, enforced in the route), `rabbit_events` (`rabbit_id` FK with `ON DELETE cascade`, `type` (`show`/`sale`/`other`, CHECK-constrained), `event_date`/`title` notNull, `notes`, plus `show_class`/`placement` which are only meaningful for `type='show'` — the manually-logged events behind the rabbit timeline; see the rabbit-timeline note below), and `settings` (`key` text primary key, `value` text — simple key-value store, not a typed config object). The `rabbits` table also carries a nullable `breed` column (added for the Shows feature's entries/report, but surfaced everywhere a rabbit is edited/displayed). `arba_shows_cache` (`id`, `fetched_at`, `data` — a JSON blob of the normalized ARBA show list; only ever one row, the latest scrape; see `lib/arba.ts` + `routes/shows.ts`). `show_events` (`name` notNull, `notes`, `created_at`/`updated_at` — a user-created grouping of ARBA shows; **no `user_id`**, single-user app) and `show_event_shows` (`show_event_id` FK with `ON DELETE cascade`, plus a **snapshot** of the ARBA row at add-time: `sanction_number`/`club_name` notNull, `show_date`/`show_type`/`specialty_breed`/`city`/`state`/`address`/`secretary`/`secretary_email`/`catalog_url`/`maps_url`/`display_order` — copied rather than referencing the cache because ARBA listings are transient). `show_event_entries` (a herd rabbit entered into a specific show: `show_event_show_id` FK `ON DELETE cascade`, `rabbit_id` FK to `rabbits` **without** cascade, `entry_class`/`entry_number`/`notes` free text, `created_at`). `show_event_judges` (`show_event_show_id` cascade FK, `judge_name` notNull, `judge_arba_number`/`notes`). `show_event_placements` (one per entry — `entry_id` is a **UNIQUE** cascade FK, making the PUT endpoint a clean upsert; `placement` free text, `legs_earned` int 0–3, `bob`/`bos`/`bis`/`ris` boolean-mode integers, `notes`). The Shows feature's data model is now complete (Phases 1–4). |
+| `db/schema.ts` | Drizzle schema definitions: `rabbits` (24 base fields incl. `acquired_date`/`death_date` — the two timeline anchors that aren't derivable, see the rabbit-timeline note below; 7 genetics loci columns, 14 chain-authority `_name_text` ancestor columns; `sex`/`status` enforced via SQLite `CHECK` constraints, not just TS union types; `sire_id`/`dam_id` self-referencing FKs), `litters` (`sire_id`/`dam_id` FKs to `rabbits.id`, `breed_date`, `kindle_date`, `kit_count`, `notes`, `created_at` — a litter row spans the breeding→kindle lifecycle: `breed_date` is set when a breeding is recorded, `kindle_date` is nullable until the doe kindles; at least one of the two is required, enforced in the route), `rabbit_events` (`rabbit_id` FK with `ON DELETE cascade`, `type` (`show`/`sale`/`other`, CHECK-constrained), `event_date`/`title` notNull, `notes`, plus `show_class`/`placement` which are only meaningful for `type='show'` — the manually-logged events behind the rabbit timeline; see the rabbit-timeline note below), and `settings` (`key` text primary key, `value` text — simple key-value store, not a typed config object). The `rabbits` table also carries a nullable `breed` column (added for the Shows feature's entries/report, but surfaced everywhere a rabbit is edited/displayed). `arba_shows_cache` (`id`, `fetched_at`, `data` — a JSON blob of the normalized ARBA show list; only ever one row, the latest scrape; see `lib/arba.ts` + `routes/shows.ts`). `show_events` (`name` notNull, `notes`, `created_at`/`updated_at` — a user-created grouping of ARBA shows; **no `user_id`**, single-user app) and `show_event_shows` (`show_event_id` FK with `ON DELETE cascade`, plus a **snapshot** of the ARBA row at add-time: `sanction_number`/`club_name` notNull, `show_date`/`show_type`/`specialty_breed`/`city`/`state`/`address`/`secretary`/`secretary_email`/`catalog_url`/`maps_url`/`display_order` — copied rather than referencing the cache because ARBA listings are transient). `show_event_entries` (a herd rabbit entered into a specific show: `show_event_show_id` FK `ON DELETE cascade`, `rabbit_id` FK to `rabbits` **without** cascade, `entry_class`/`entry_number`/`notes` free text, `created_at`). `show_event_judges` (`show_event_show_id` cascade FK, `judge_name` notNull, `judge_arba_number`/`notes`). `show_event_placements` (one per entry — `entry_id` is a **UNIQUE** cascade FK, making the PUT endpoint a clean upsert; `placement` free text, `legs_earned` int 0–3, `bob`/`bos`/`bis`/`ris` boolean-mode integers, `notes`). The Shows feature's data model is now complete (Phases 1–4). **User accounts** (`FEATURE_User_Accounts.md`): `users` (`username` notNull UNIQUE — case-sensitive index, case-insensitive enforcement lives in `lower()` queries; `password_hash` notNull `"scrypt:<salt>:<hash>"`; nullable per-user `theme`/`weight_unit` prefs — NULL inherits the global settings value; `created_at`) and `auth_sessions` (`token` text PK, `user_id` FK with a **declarative-only** cascade — the app runs with SQLite `foreign_keys` OFF, so `routes/users.ts` deletes sessions explicitly; `expires_at` ISO, purged lazily on session checks). |
 | `db/migrations/` | Generated by `drizzle-kit generate`, applied either manually via `drizzle-kit migrate` (CLI) or automatically on server startup via `db/client.ts`'s in-code `migrate()` call. Both share the same `__drizzle_migrations` tracking table, so there's no double-apply risk mixing the two paths. Contains the SQL migration files (`0000_modern_power_pack.sql` — rabbits, `0001_military_lord_tyger.sql` — litters, `0002_luxuriant_the_stranger.sql` — settings) — these are committed and intentionally **not** excluded by `.dockerignore` (only `node_modules` and `data` are). |
 | `drizzle.config.ts` | Points `drizzle-kit` at `./db/schema.ts` for migration generation and `./data/mykindlebox.db` as the target DB. |
 | `tsconfig.json` | TypeScript config: CommonJS module output (matches `package.json`'s `"type": "commonjs"`), strict mode on, compiles to `dist/`. |
@@ -109,4 +109,5 @@ docker-compose.yml — orchestrates both services for self-hosted deployment
 - **Rabbit timeline = derived events + column-backed dates + a generic events table** (`RabbitTimeline.jsx`, post-Phase-11 feature): the per-rabbit timeline is built in `buildEvents()` by **merging** three sources, and which source a given event kind comes from is a deliberate design line — don't collapse them. (1) **Derived** (no storage): **birth** (`rabbit.dob`) and **breedings/kindles** (the `litters` where this rabbit is sire/dam — one "Bred with {partner}" event per `breed_date`, one "… kindled" event per `kindle_date`). Because breedings are auto-derived, the "Add Event" dropdown deliberately **omits Breeding** — logging one means creating a litter via the existing Add Breeding/Litter flow, not a manual timeline note (this was an explicit user decision). (2) **Column-backed**: **acquired** and **death** are nullable date columns on `rabbits` (`acquired_date` only renders when set *and* different from `dob`, since a same-day acquired date is just birth), edited through the normal rabbit `PATCH` (they're in `EditRabbit.jsx`'s `DETAIL_KEYS` and rendered by `RabbitDetailsForm.jsx`). (3) **Logged events**: the `rabbit_events` table (`routes/events.ts`) holds `show`/`sale`/`other` — the only kinds with their own CRUD UI, inline in the timeline card via the "Add Event" dropdown. **NOTE the history here**: this started as a `shows`-only table, then the user asked for a generic "Add Event" dropdown, so it was generalized to `rabbit_events` (migrations `0005_drop_shows` + `0006_add_rabbit_events` — drizzle-kit refused to auto-detect the rename non-interactively, so the table was dropped and recreated in two clean generates rather than one). A **sale** event also flips the rabbit's `status` to `sold` server-side (so the client invalidates `['rabbit']`/`['stats']` after one). Sorting is lexicographic on the ISO date string with `EVENT_TYPES[type].order` as the same-day tiebreaker (birth < acquired < breeding < kindle < show < sale < other < death).
 - **ARBA scraping (Shows feature)** — the show listing comes from scraping `https://arba.net/show-search/`, and two facts about that page are load-bearing; don't "simplify" them away (`lib/arba.ts`): (1) ARBA is behind **Cloudflare** — a bare request returns a "you have been blocked" challenge page, so the scraper sends browser `User-Agent` + `Accept` headers (and deliberately omits `Accept-Encoding` so undici/global-fetch negotiates + decompresses). (2) The data is a WordPress **Ninja Tables** table; its ~2,000 rows are server-rendered into the page HTML as **positional `<td>` cells** (cells have no column classes — read by index 0–10: sanction, date, state, district, city, showInformation, address, maps-`<a>`, secretary, email, catalog-`<a>`). It was tempting to hit the Ninja Tables `admin-ajax.php` data endpoint instead, but for this CSV-backed table that endpoint returns an empty array — the rows only exist in the rendered HTML. Normalization drops cavy shows and non-US rows and parses `showInformation` into club/type/breed by anchoring on the show-type phrase (club names contain commas). Results are cached in `arba_shows_cache` (one row) and only re-scraped when >24h stale or force-refreshed; this matches ARBA's Mon–Fri update cadence and keeps us light on their Cloudflare. **All four phases are built** (the Shows feature is feature-complete per `memory-bank/mykindlebox-shows-design-doc.md`): Phase 1 = browse + cache (`routes/shows.ts`, `Shows.jsx`); Phase 2 = show events + the "Add to Event" flow (`routes/showEvents.ts`, `ShowEvents.jsx`/`ShowEventDetail.jsx`/`AddToEventModal.jsx`); Phase 3 = entries + entries-report (`show_event_entries`, the entry/report endpoints, the Entries tab + `RabbitPicker.jsx`/`ReportModal.jsx`); Phase 4 = judges + placements + Results tab (`show_event_judges`/`show_event_placements`, the judge/placement endpoints, the `JudgesSection`/`PlacementEditor`/`ResultsTab` UI). Not built (explicitly out of scope or deferred): the design doc's optional **Report Settings** (custom header/footer, toggles), **bulk multi-select** "Add selected to Event" from the browser (single per-row add is implemented instead), and judge **editing** UI (the PATCH endpoint exists but the card only adds/removes). Note throughout that the doc's `user_id`/`users` table and `tattoo`/`variety` fields don't exist here — single-user, with `ear_number`/`color_name`/the `breed` column instead.
 - **OCR/Tesseract assets are vendored, not CDN-fetched, and the `eng.traineddata` is stored uncompressed** (OCR Pedigree Scanning feature, `public/tesseract/`): tesseract.js by default downloads its worker, WASM core, and language data from jsDelivr on first use — unacceptable for a self-hosted offline-first app, so all of it lives under `public/tesseract/` and the worker must be configured with explicit local paths. Two load-bearing facts when wiring up `ocrRun.js` (OCR Phase 3): (1) **`gzip: false` is required** alongside `langPath: '/tesseract/'`, because the vendored `eng.traineddata` is decompressed — the default `gzip: true` makes the worker request `eng.traineddata.gz`, which 404s. (2) **`corePath` should point at the directory `'/tesseract/'`, not a specific file**, so tesseract.js's `wasm-feature-detect` step picks the matching core (`relaxedsimd-lstm` → `simd-lstm` → `lstm`) for the running browser; all three `-lstm` `.wasm.js` cores are vendored for exactly this reason (the app uses the default `LSTM_ONLY` OEM, so the non-`-lstm`/`.asm` cores are never requested and aren't vendored). `workerPath` is `'/tesseract/worker.min.js'`. Don't re-point any of these at a CDN or "slim" the core set down to one file without re-checking the feature-detect branch in `tesseract.js/src/worker-script/browser/getCore.js`. The service worker precaches + cache-firsts these (see `public/sw.js` above).
+- **Auth is account-based and always on** (`FEATURE_User_Accounts.md`, replacing the original optional shared-password mode): accounts live in `users`, sessions in `auth_sessions` (so restarts don't sign anyone out), passwords are scrypt-hashed via `node:crypto` (**deliberately not bcrypt/argon2** — no native dependency, so the Alpine Docker build is unchanged). All users share the herd; everyone equal (no roles). The first account is created through `POST /api/auth/setup`, which only works while the `users` table is empty — the client's `AuthProvider` shows a `SetupScreen` when `GET /api/auth/status` reports `configured: false`. Any signed-in user manages users at `/api/users` (Settings → Users card); you can't delete yourself, which transitively protects the last account. **`/api/settings` kept its exact single-object shape** but storage split: `theme`/`weight_unit` read/write the caller's `users` row (NULL falls back to the global settings value), the rest stay in the `settings` table — client consumers (ThemeSync, `useWeightUnit`, the Settings page) required no changes. The old `AUTH_PASSWORD`/`MYKINDLEBOX_PASSWORD` env var is retired and ignored (a startup warning fires if it's still set); an upgrading deployment sees the setup screen once and keeps all data. Failed logins get a flat 350 ms delay as brute-force damping.
 - **Offline handling is one app-wide banner, not per-query state**: `Layout.jsx`'s `OfflineBanner` listens to the `online`/`offline` `window` events directly — it isn't wired to React Query's error state. This was a deliberate scope choice: every page already has its own `isError` fallback (so nothing crashes when a fetch fails offline), and threading a distinct "offline" message through every individual query would duplicate that existing handling for a cosmetic improvement only. If a future feature needs to distinguish "offline" from "other network error" *within* a specific page's content (not just a banner), that's new logic, not an extension of this banner.
diff --git a/memory-bank/progress.md b/memory-bank/progress.md
index b0f7a40..596f37f 100644
--- a/memory-bank/progress.md
+++ b/memory-bank/progress.md
@@ -300,3 +300,38 @@ All four modules are pure client-side libs under `client/src/lib/` with no serve
   - **Quadrant split deviation (documented)**: the plan says split the grandparent column "at the horizontal and vertical midpoints of the column." Image *height* isn't carried through the pipeline, so `splitGrandparentQuadrants` instead takes the midpoints of the grandparent **words' own bounding extent** (min/max of their `x0/x1`, `y0/y1`) and assigns each word by its center — top-left→`sire_sire`, bottom-left→`sire_dam`, top-right→`dam_sire`, bottom-right→`dam_dam`, per the plan's mapping. Using the text extent (vs. band geometry) also better reflects where the four cells actually sit.
 
 - **Validation so far**: `npm test` — 34 pass / 0 fail (15 new across the two test files). `npx eslint` clean on all six new files. `npm run build` succeeds (the new `tesseract.js` import resolves; it isn't pulled into the app bundle yet since nothing imports the pipeline until plan Phase 5). **Per the user's request, stopping here for them to validate the Phase 3 tests (especially the browser-only `runOCR`/`extractPedigree` paths against a real pedigree image) before OCR Phase 4 — the UI components — begins.**
+
+## User Accounts & Onboarding (2026-07-02)
+
+Replaced the optional shared-password auth with real user accounts — see
+`memory-bank/FEATURE_User_Accounts.md` for the user-confirmed scope (shared
+herd, in-app account creation, everyone equal, per-user theme/weight-unit).
+
+- **Schema** (`0011_add_users.sql`): `users` (username UNIQUE, scrypt
+  `password_hash`, nullable per-user `theme`/`weight_unit`) + `auth_sessions`
+  (token PK, `user_id`, `expires_at` — persisted so restarts don't sign anyone
+  out; cascade is declarative-only since `foreign_keys` is OFF, so user deletion
+  removes sessions explicitly).
+- **Server**: `auth.ts` rewritten — `hashPassword`/`verifyPassword`
+  (`node:crypto` scrypt, `timingSafeEqual`; deliberately no bcrypt/argon2 native
+  dep), DB sessions with lazy expiry purge, `requireAuth` attaches
+  `req.user`. New `POST /api/auth/setup` (first account only — 409 after),
+  username+password login with a flat 350 ms failed-login delay, and
+  `routes/users.ts` (list/create/reset-password/delete; can't delete self;
+  password reset invalidates the target's other sessions). `/api/settings`
+  kept its exact shape but `theme`/`weight_unit` now read/write the caller's
+  user row (NULL inherits the global value) — zero client-consumer changes.
+- **Client**: `AuthProvider` gained a third gate (`configured: false` →
+  `SetupScreen`), the login screen takes username+password, context exposes
+  `user`, and Settings gained a `UsersCard` (add/reset/remove) plus
+  "Signed in as …" in the Account card.
+- **Retired**: `AUTH_PASSWORD`/`MYKINDLEBOX_PASSWORD` (removed from compose +
+  README; the server logs a warning if it's still set). Upgrading deployments
+  see the one-time setup screen; herd data untouched.
+- **Validation**: server tsc clean; client lint/41-tests/build clean. Full API
+  lifecycle driven over HTTP against a scratch DB: fresh-install status →
+  401 on protected routes → weak-password 400 → setup → second setup 409 →
+  wrong-password 401 (~400 ms) → case-insensitive login → duplicate-username
+  409 → per-user theme divergence with shared `rabbitry_name` → self-delete
+  400 → password reset killing the target's session → delete → logout →
+  **session surviving a server restart**.
diff --git a/memory-bank/tech-stack.md b/memory-bank/tech-stack.md
index 0481637..29e0ede 100644
--- a/memory-bank/tech-stack.md
+++ b/memory-bank/tech-stack.md
@@ -13,5 +13,5 @@
 | Styling | Tailwind CSS | Custom theme tokens |
 | Backend | Node.js + Express | REST API |
 | Database | SQLite (via Drizzle ORM) | Single-file DB, easy backup |
-| Auth | Single-user session token | Self-hosted, no OAuth complexity |
+| Auth | User accounts, shared herd (scrypt + SQLite sessions) | Self-hosted, no OAuth complexity |
 | Hosting | Docker Compose | Nginx + Node + SQLite volume |
diff --git a/mykindlebox/README.md b/mykindlebox/README.md
index 6235351..bb6b7c0 100644
--- a/mykindlebox/README.md
+++ b/mykindlebox/README.md
@@ -1,8 +1,9 @@
 # MyKindlebox
 
 A self-hosted rabbitry (rabbit breeding herd) management web app — track your
-rabbits, their pedigrees, litters, and genetics. Single-user, self-hosted, and
-designed to replace a legacy PHP herd-management site.
+rabbits, their pedigrees, litters, and genetics. Self-hosted, with simple user
+accounts sharing one herd, and designed to replace a legacy PHP
+herd-management site.
 
 The core differentiator: **adding a rabbit starts from a pedigree tree, not a
 blank form.** The 3-generation ancestor tree (sire/dam and their sires/dams) is
@@ -35,7 +36,7 @@ herd and graceful fallback to freeform text for bought-in or unknown ancestors.
 | Styling  | Tailwind CSS                                          |
 | Backend  | Node.js + Express 5 (REST API)                        |
 | Database | SQLite via Drizzle ORM (single-file DB)               |
-| Auth     | Single-user session token (optional password)        |
+| Auth     | User accounts, shared herd (scrypt + DB sessions)     |
 | Hosting  | Docker Compose (Nginx + Node + SQLite volume)         |
 
 ## Project layout
@@ -101,15 +102,15 @@ listens on 80.)
 
 ### Authentication
 
-Auth is **optional** and off by default. To require a login, set
-`MYKINDLEBOX_PASSWORD` (e.g. in a `.env` file next to `docker-compose.yml`):
+The app uses **user accounts** — everyone shares the same herd; accounts are
+separate logins with their own theme and weight-display preference. On first
+launch the app shows a one-time **create your account** screen; add more people
+later under **Settings → Users**. Passwords are hashed (scrypt) and sessions
+last 30 days, surviving server restarts.
 
-```env
-MYKINDLEBOX_PASSWORD=your-password-here
-```
-
-If left unset, the app is open to anyone who can reach it — only acceptable on a
-fully trusted network.
+> **Upgrading from the password-only version?** The old `MYKINDLEBOX_PASSWORD`
+> env var is no longer used — remove it from your `.env`. On your next visit
+> you'll see the one-time account-creation screen; your herd data is untouched.
 
 ## Data & backups
 
diff --git a/mykindlebox/client/src/api.js b/mykindlebox/client/src/api.js
index 66bf880..51376d0 100644
--- a/mykindlebox/client/src/api.js
+++ b/mykindlebox/client/src/api.js
@@ -143,8 +143,19 @@ export const importData = (file) => {
   return request('/import', { method: 'POST', body: formData })
 }
 
-// Auth
+// Auth (user accounts — see memory-bank/FEATURE_User_Accounts.md)
 export const getAuthStatus = () => request('/auth/status')
-export const login = (password) =>
-  request('/auth/login', { method: 'POST', body: JSON.stringify({ password }) })
+export const login = (username, password) =>
+  request('/auth/login', { method: 'POST', body: JSON.stringify({ username, password }) })
 export const logout = () => request('/auth/logout', { method: 'POST' })
+// First-run onboarding: creates the first account (409 once any user exists).
+export const setupAccount = (username, password) =>
+  request('/auth/setup', { method: 'POST', body: JSON.stringify({ username, password }) })
+
+// Users (shared herd — users are logins, not data owners)
+export const getUsers = () => request('/users')
+export const createUser = (username, password) =>
+  request('/users', { method: 'POST', body: JSON.stringify({ username, password }) })
+export const resetUserPassword = (id, password) =>
+  request(`/users/${id}`, { method: 'PATCH', body: JSON.stringify({ password }) })
+export const deleteUser = (id) => request(`/users/${id}`, { method: 'DELETE' })
diff --git a/mykindlebox/client/src/auth.jsx b/mykindlebox/client/src/auth.jsx
index 5842bc1..afe386c 100644
--- a/mykindlebox/client/src/auth.jsx
+++ b/mykindlebox/client/src/auth.jsx
@@ -1,14 +1,61 @@
 import { useCallback, useEffect, useState } from 'react'
-import { useQuery } from '@tanstack/react-query'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
 import {
   getAuthStatus,
   login as apiLogin,
   logout as apiLogout,
+  setupAccount,
   setUnauthorizedHandler,
 } from './api'
 import { AuthContext } from './authContext'
 
+const MIN_PASSWORD_LENGTH = 8 // mirrors the server's MIN_PASSWORD_LENGTH
+
+function AuthShell({ title, subtitle, onSubmit, error, children }) {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-surface px-4">
+      <form
+        onSubmit={onSubmit}
+        className="w-full max-w-sm space-y-4 rounded-md border border-border bg-surface-raised p-6"
+      >
+        <div>
+          <h1 className="font-display text-2xl text-text-primary">{title}</h1>
+          {subtitle && <p className="mt-1 font-body text-sm text-text-secondary">{subtitle}</p>}
+        </div>
+        {children}
+        {error && <p className="font-body text-sm text-danger">{error}</p>}
+      </form>
+    </div>
+  )
+}
+
+function Field({ label, hint, ...inputProps }) {
+  return (
+    <div>
+      <label className="block font-body text-sm font-medium text-text-primary">{label}</label>
+      <input
+        className="mt-1 w-full rounded-md border border-border px-3 py-2 font-body text-sm focus:outline-none focus:ring-2 focus:ring-accent"
+        {...inputProps}
+      />
+      {hint && <p className="mt-1 font-body text-xs text-text-secondary">{hint}</p>}
+    </div>
+  )
+}
+
+function SubmitButton({ disabled, children }) {
+  return (
+    <button
+      type="submit"
+      disabled={disabled}
+      className="w-full rounded-md bg-accent px-4 py-2 font-body text-sm text-surface hover:bg-accent-hover disabled:opacity-50"
+    >
+      {children}
+    </button>
+  )
+}
+
 function LoginScreen({ onSuccess }) {
+  const [username, setUsername] = useState('')
   const [password, setPassword] = useState('')
   const [error, setError] = useState(null)
   const [submitting, setSubmitting] = useState(false)
@@ -18,8 +65,8 @@ function LoginScreen({ onSuccess }) {
     setSubmitting(true)
     setError(null)
     try {
-      await apiLogin(password)
-      onSuccess()
+      const result = await apiLogin(username, password)
+      onSuccess(result.user)
     } catch (err) {
       setError(err.message || 'Login failed')
     } finally {
@@ -28,76 +75,164 @@ function LoginScreen({ onSuccess }) {
   }
 
   return (
-    <div className="flex min-h-screen items-center justify-center bg-surface px-4">
-      <form
-        onSubmit={handleSubmit}
-        className="w-full max-w-sm space-y-4 rounded-md border border-border bg-surface-raised p-6"
-      >
-        <h1 className="font-display text-2xl text-text-primary">MyKindlebox</h1>
-        <div>
-          <label className="block font-body text-sm font-medium text-text-primary">Password</label>
-          <input
-            type="password"
-            autoFocus
-            value={password}
-            onChange={(e) => setPassword(e.target.value)}
-            className="mt-1 w-full rounded-md border border-border px-3 py-2 font-body text-sm focus:outline-none focus:ring-2 focus:ring-accent"
-          />
-        </div>
-        {error && <p className="font-body text-sm text-danger">{error}</p>}
-        <button
-          type="submit"
-          disabled={submitting || !password}
-          className="w-full rounded-md bg-accent px-4 py-2 font-body text-sm text-surface hover:bg-accent-hover disabled:opacity-50"
-        >
-          {submitting ? 'Signing in…' : 'Sign in'}
-        </button>
-      </form>
-    </div>
+    <AuthShell title="MyKindlebox" onSubmit={handleSubmit} error={error}>
+      <Field
+        label="Username"
+        type="text"
+        autoFocus
+        autoComplete="username"
+        value={username}
+        onChange={(e) => setUsername(e.target.value)}
+      />
+      <Field
+        label="Password"
+        type="password"
+        autoComplete="current-password"
+        value={password}
+        onChange={(e) => setPassword(e.target.value)}
+      />
+      <SubmitButton disabled={submitting || !username.trim() || !password}>
+        {submitting ? 'Signing in…' : 'Sign in'}
+      </SubmitButton>
+    </AuthShell>
+  )
+}
+
+// First-run onboarding: shown only while the server reports `configured: false`
+// (no users exist yet). Creates the first account and signs it in. More
+// accounts are added later from Settings → Users.
+function SetupScreen({ onSuccess }) {
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+  const [confirm, setConfirm] = useState('')
+  const [error, setError] = useState(null)
+  const [submitting, setSubmitting] = useState(false)
+
+  async function handleSubmit(e) {
+    e.preventDefault()
+    if (password !== confirm) {
+      setError('Passwords do not match')
+      return
+    }
+    setSubmitting(true)
+    setError(null)
+    try {
+      const result = await setupAccount(username.trim(), password)
+      onSuccess(result.user)
+    } catch (err) {
+      setError(err.message || 'Setup failed')
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  const valid =
+    username.trim().length > 0 && password.length >= MIN_PASSWORD_LENGTH && confirm.length > 0
+
+  return (
+    <AuthShell
+      title="Welcome to MyKindlebox"
+      subtitle="Create your account to get started. You can add accounts for other people later, under Settings."
+      onSubmit={handleSubmit}
+      error={error}
+    >
+      <Field
+        label="Username"
+        type="text"
+        autoFocus
+        autoComplete="username"
+        value={username}
+        onChange={(e) => setUsername(e.target.value)}
+      />
+      <Field
+        label="Password"
+        type="password"
+        autoComplete="new-password"
+        hint={`At least ${MIN_PASSWORD_LENGTH} characters.`}
+        value={password}
+        onChange={(e) => setPassword(e.target.value)}
+      />
+      <Field
+        label="Confirm password"
+        type="password"
+        autoComplete="new-password"
+        value={confirm}
+        onChange={(e) => setConfirm(e.target.value)}
+      />
+      <SubmitButton disabled={submitting || !valid}>
+        {submitting ? 'Creating account…' : 'Create account'}
+      </SubmitButton>
+    </AuthShell>
   )
 }
 
 // Gates the whole app behind the server's auth state. The server is the source
 // of truth (fetched via React Query, like every other server read); `session`
-// is a local override for client-driven transitions — login, logout, or a 401
-// on any protected request — that shouldn't wait on a refetch to take effect.
+// is a local override for client-driven transitions — login, setup, logout, or
+// a 401 on any protected request — that shouldn't wait on a refetch to take
+// effect. Three gates: no users yet → SetupScreen (first-run onboarding),
+// unauthenticated → LoginScreen, else the app with `user` in context.
 export function AuthProvider({ children }) {
-  const { data, isLoading } = useQuery({
+  const queryClient = useQueryClient()
+  const { data, isLoading, isError } = useQuery({
     queryKey: ['auth-status'],
     queryFn: getAuthStatus,
     retry: false,
     staleTime: Infinity,
   })
-  const [session, setSession] = useState(null)
+  const [session, setSession] = useState(null) // { authenticated, user } override
 
   // Subscribing to an external signal (the api layer's 401 hook) — the callback
   // sets state, the effect body itself doesn't.
   useEffect(() => {
-    setUnauthorizedHandler(() => setSession(false))
+    setUnauthorizedHandler(() => setSession({ authenticated: false, user: null }))
     return () => setUnauthorizedHandler(null)
   }, [])
 
+  const handleAuthed = useCallback(
+    (user) => {
+      setSession({ authenticated: true, user })
+      // Refresh the canonical copy — after first-run setup this also flips
+      // `configured` to true so a later logout lands on Login, not Setup.
+      queryClient.invalidateQueries({ queryKey: ['auth-status'] })
+    },
+    [queryClient],
+  )
+
   const logout = useCallback(async () => {
     try {
       await apiLogout()
     } finally {
-      setSession(false)
+      setSession({ authenticated: false, user: null })
+      queryClient.invalidateQueries({ queryKey: ['auth-status'] })
     }
-  }, [])
+  }, [queryClient])
 
   if (isLoading) return null
 
-  // No data (server unreachable) is treated as "auth not configured" so the app
-  // still renders and can show its own offline/error states per page.
-  const configured = data?.configured ?? false
-  if (!configured) {
-    return <AuthContext.Provider value={{ mode: 'open', logout }}>{children}</AuthContext.Provider>
+  // Server unreachable: render the app anyway so each page can show its own
+  // offline/error state instead of a dead-end auth screen.
+  if (isError) {
+    return (
+      <AuthContext.Provider value={{ mode: 'open', user: null, logout }}>
+        {children}
+      </AuthContext.Provider>
+    )
   }
 
-  const authenticated = session ?? data?.authenticated ?? false
-  if (!authenticated) {
-    return <LoginScreen onSuccess={() => setSession(true)} />
+  const authenticated = session?.authenticated ?? data?.authenticated ?? false
+  const user = session?.user ?? data?.user ?? null
+
+  if (authenticated) {
+    return (
+      <AuthContext.Provider value={{ mode: 'authed', user, logout }}>
+        {children}
+      </AuthContext.Provider>
+    )
   }
 
-  return <AuthContext.Provider value={{ mode: 'authed', logout }}>{children}</AuthContext.Provider>
+  if (!data?.configured) {
+    return <SetupScreen onSuccess={handleAuthed} />
+  }
+  return <LoginScreen onSuccess={handleAuthed} />
 }
diff --git a/mykindlebox/client/src/authContext.js b/mykindlebox/client/src/authContext.js
index 1784979..b523369 100644
--- a/mykindlebox/client/src/authContext.js
+++ b/mykindlebox/client/src/authContext.js
@@ -3,7 +3,7 @@ import { createContext, useContext } from 'react'
 // Split out from auth.jsx so that file can export only components (the
 // react-refresh lint rule), and so pages can import useAuth without pulling in
 // the provider.
-export const AuthContext = createContext({ mode: 'open', logout: () => {} })
+export const AuthContext = createContext({ mode: 'open', user: null, logout: () => {} })
 
 export function useAuth() {
   return useContext(AuthContext)
diff --git a/mykindlebox/client/src/components/UsersCard.jsx b/mykindlebox/client/src/components/UsersCard.jsx
new file mode 100644
index 0000000..76cbdd7
--- /dev/null
+++ b/mykindlebox/client/src/components/UsersCard.jsx
@@ -0,0 +1,203 @@
+import { useState } from 'react'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
+import Card from './Card'
+import Button from './Button'
+import { getUsers, createUser, resetUserPassword, deleteUser } from '../api'
+import { useAuth } from '../authContext'
+
+const MIN_PASSWORD_LENGTH = 8 // mirrors the server's MIN_PASSWORD_LENGTH
+
+const inputClass =
+  'mt-1 w-full rounded-md border border-border px-3 py-2 font-body text-sm focus:outline-none focus:ring-2 focus:ring-accent'
+
+// Settings → Users (memory-bank/FEATURE_User_Accounts.md): everyone-equal user
+// management for the shared herd. Any signed-in user can add users, reset any
+// password (that's the "someone forgot theirs" path — no current-password
+// check), and delete accounts other than their own.
+export default function UsersCard({ onToast }) {
+  const { user: me } = useAuth()
+  const queryClient = useQueryClient()
+  const { data: users, isLoading } = useQuery({ queryKey: ['users'], queryFn: getUsers })
+
+  const [newUsername, setNewUsername] = useState('')
+  const [newPassword, setNewPassword] = useState('')
+  const [addError, setAddError] = useState(null)
+  const [resetTarget, setResetTarget] = useState(null) // user id with the reset form open
+  const [resetPassword, setResetPassword] = useState('')
+  const [deleteTarget, setDeleteTarget] = useState(null) // user object pending confirm
+  const [busy, setBusy] = useState(false)
+
+  async function handleAdd(e) {
+    e.preventDefault()
+    setBusy(true)
+    setAddError(null)
+    try {
+      await createUser(newUsername.trim(), newPassword)
+      queryClient.invalidateQueries({ queryKey: ['users'] })
+      onToast(`Added ${newUsername.trim()}`)
+      setNewUsername('')
+      setNewPassword('')
+    } catch (err) {
+      setAddError(err.message || 'Could not add user')
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  async function handleReset(user) {
+    setBusy(true)
+    try {
+      await resetUserPassword(user.id, resetPassword)
+      onToast(`Password updated for ${user.username}`)
+      setResetTarget(null)
+      setResetPassword('')
+    } catch (err) {
+      onToast(err.message || 'Could not update password')
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  async function handleDelete() {
+    setBusy(true)
+    try {
+      await deleteUser(deleteTarget.id)
+      queryClient.invalidateQueries({ queryKey: ['users'] })
+      onToast(`Removed ${deleteTarget.username}`)
+      setDeleteTarget(null)
+    } catch (err) {
+      onToast(err.message || 'Could not remove user')
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  return (
+    <Card className="space-y-4 p-6">
+      <div>
+        <h2 className="font-display text-lg text-text-primary">Users</h2>
+        <p className="mt-1 font-body text-sm text-text-secondary">
+          Everyone here shares the same herd and can manage users. Theme and weight display are
+          per-user; the rest of Settings is shared.
+        </p>
+      </div>
+
+      {isLoading ? (
+        <p className="font-body text-sm text-text-secondary">Loading…</p>
+      ) : (
+        <ul className="divide-y divide-border">
+          {(users ?? []).map((user) => (
+            <li key={user.id} className="py-3 first:pt-0 last:pb-0">
+              <div className="flex items-center justify-between gap-3">
+                <span className="min-w-0 truncate font-body text-sm font-medium text-text-primary">
+                  {user.username}
+                  {me?.id === user.id && (
+                    <span className="ml-2 rounded bg-surface-sunken px-1.5 py-0.5 font-body text-xs text-text-secondary">
+                      you
+                    </span>
+                  )}
+                </span>
+                <span className="flex shrink-0 gap-2">
+                  <Button
+                    variant="secondary"
+                    onClick={() => {
+                      setResetTarget(resetTarget === user.id ? null : user.id)
+                      setResetPassword('')
+                    }}
+                  >
+                    {resetTarget === user.id ? 'Cancel' : 'Reset password'}
+                  </Button>
+                  {me?.id !== user.id && (
+                    <Button variant="danger" onClick={() => setDeleteTarget(user)}>
+                      Remove
+                    </Button>
+                  )}
+                </span>
+              </div>
+              {resetTarget === user.id && (
+                <div className="mt-2 flex items-end gap-2">
+                  <div className="flex-1">
+                    <label className="block font-body text-xs text-text-secondary">
+                      New password (min {MIN_PASSWORD_LENGTH} characters)
+                    </label>
+                    <input
+                      type="password"
+                      autoFocus
+                      autoComplete="new-password"
+                      value={resetPassword}
+                      onChange={(e) => setResetPassword(e.target.value)}
+                      className={inputClass}
+                    />
+                  </div>
+                  <Button
+                    onClick={() => handleReset(user)}
+                    disabled={busy || resetPassword.length < MIN_PASSWORD_LENGTH}
+                  >
+                    Save
+                  </Button>
+                </div>
+              )}
+            </li>
+          ))}
+        </ul>
+      )}
+
+      <form onSubmit={handleAdd} className="space-y-3 border-t border-border pt-4">
+        <h3 className="font-body text-sm font-medium text-text-primary">Add a user</h3>
+        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
+          <div>
+            <label className="block font-body text-xs text-text-secondary">Username</label>
+            <input
+              type="text"
+              autoComplete="off"
+              value={newUsername}
+              onChange={(e) => setNewUsername(e.target.value)}
+              className={inputClass}
+            />
+          </div>
+          <div>
+            <label className="block font-body text-xs text-text-secondary">
+              Password (min {MIN_PASSWORD_LENGTH} characters)
+            </label>
+            <input
+              type="password"
+              autoComplete="new-password"
+              value={newPassword}
+              onChange={(e) => setNewPassword(e.target.value)}
+              className={inputClass}
+            />
+          </div>
+        </div>
+        {addError && <p className="font-body text-sm text-danger">{addError}</p>}
+        <Button
+          type="submit"
+          disabled={busy || !newUsername.trim() || newPassword.length < MIN_PASSWORD_LENGTH}
+        >
+          Add User
+        </Button>
+      </form>
+
+      {deleteTarget && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 p-4">
+          <Card className="w-full max-w-md space-y-4 p-6">
+            <h2 className="font-display text-lg text-text-primary">
+              Remove {deleteTarget.username}?
+            </h2>
+            <p className="font-body text-sm text-text-secondary">
+              They will be signed out everywhere and can no longer log in. The herd data is shared,
+              so nothing else is deleted.
+            </p>
+            <div className="flex justify-end gap-2">
+              <Button variant="secondary" onClick={() => setDeleteTarget(null)} disabled={busy}>
+                Cancel
+              </Button>
+              <Button variant="danger" onClick={handleDelete} disabled={busy}>
+                {busy ? 'Removing…' : 'Remove User'}
+              </Button>
+            </div>
+          </Card>
+        </div>
+      )}
+    </Card>
+  )
+}
diff --git a/mykindlebox/client/src/pages/Settings.jsx b/mykindlebox/client/src/pages/Settings.jsx
index 73ddc5b..144c554 100644
--- a/mykindlebox/client/src/pages/Settings.jsx
+++ b/mykindlebox/client/src/pages/Settings.jsx
@@ -4,6 +4,7 @@ import PageHeader from '../components/PageHeader'
 import Card from '../components/Card'
 import Button from '../components/Button'
 import BreedSelect from '../components/BreedSelect'
+import UsersCard from '../components/UsersCard'
 import { useAuth } from '../authContext'
 import { getSettings, updateSettings, exportDatabaseUrl, importData } from '../api'
 import { THEMES, applyTheme, DEFAULT_THEME } from '../lib/theme'
@@ -23,7 +24,7 @@ function Toast({ message }) {
 }
 
 function Settings() {
-  const { mode, logout } = useAuth()
+  const { mode, user, logout } = useAuth()
   const queryClient = useQueryClient()
   const { data: settings, isLoading } = useQuery({ queryKey: ['settings'], queryFn: getSettings })
   const [form, setForm] = useState(null)
@@ -257,17 +258,20 @@ function Settings() {
         </Card>
 
         {mode === 'authed' && (
-          <Card className="space-y-3 p-6">
-            <div>
-              <h2 className="font-display text-lg text-text-primary">Account</h2>
-              <p className="mt-1 font-body text-sm text-text-secondary">
-                End this session on this device.
-              </p>
-            </div>
-            <Button variant="secondary" onClick={logout}>
-              Log Out
-            </Button>
-          </Card>
+          <>
+            <UsersCard onToast={setToast} />
+            <Card className="space-y-3 p-6">
+              <div>
+                <h2 className="font-display text-lg text-text-primary">Account</h2>
+                <p className="mt-1 font-body text-sm text-text-secondary">
+                  {user ? `Signed in as ${user.username}. ` : ''}End this session on this device.
+                </p>
+              </div>
+              <Button variant="secondary" onClick={logout}>
+                Log Out
+              </Button>
+            </Card>
+          </>
         )}
       </div>
 
diff --git a/mykindlebox/docker-compose.yml b/mykindlebox/docker-compose.yml
index 22e6952..3fa560e 100644
--- a/mykindlebox/docker-compose.yml
+++ b/mykindlebox/docker-compose.yml
@@ -2,10 +2,10 @@ services:
   server:
     build: ./server
     environment:
-      # Set MYKINDLEBOX_PASSWORD (e.g. in a .env file next to this compose file)
-      # to require a login. If left empty, auth is DISABLED and the app is open
-      # to anyone who can reach it — only acceptable on a fully trusted network.
-      AUTH_PASSWORD: ${MYKINDLEBOX_PASSWORD:-}
+      # Auth is account-based (users live in the database): the first visit
+      # shows a one-time account-creation screen, and more users are added in
+      # Settings. The old MYKINDLEBOX_PASSWORD/AUTH_PASSWORD env var is no
+      # longer used.
       DATA_DIR: /app/data
     volumes:
       - server-data:/app/data
diff --git a/mykindlebox/server/auth.ts b/mykindlebox/server/auth.ts
index eeea26d..a3ff74e 100644
--- a/mykindlebox/server/auth.ts
+++ b/mykindlebox/server/auth.ts
@@ -1,36 +1,91 @@
-import { randomUUID } from 'crypto';
+import { randomUUID, randomBytes, scryptSync, timingSafeEqual } from 'crypto';
 import { NextFunction, Request, Response } from 'express';
+import { eq, lt, sql } from 'drizzle-orm';
+import { db } from './db/client';
+import { users, authSessions } from './db/schema';
 
-// Single-user session-token auth (no OAuth, per tech-stack.md).
+// User-account session auth (see memory-bank/FEATURE_User_Accounts.md).
 //
-// A single shared password is read from the AUTH_PASSWORD env var. If it's
-// unset/empty, auth is DISABLED — every request passes through — which keeps
-// local dev frictionless. When set, clients must POST it to /api/auth/login to
-// receive an httpOnly session cookie, checked on every protected route.
-//
-// Tokens live in memory only: a server restart invalidates all sessions
-// (you log in again). That's an acceptable trade for a single-user, self-hosted
-// app and avoids persisting a session table.
+// Replaces the original single shared-password mode (AUTH_PASSWORD env var,
+// in-memory session Set): accounts live in the `users` table, sessions in
+// `auth_sessions` (so a server restart no longer signs everyone out), and the
+// first account is created through POST /api/auth/setup while the users table
+// is empty. Auth is always on once a user exists — there is no open mode.
 
 const COOKIE_NAME = 'mkb_session';
 const SESSION_TTL_MS = 30 * 24 * 60 * 60 * 1000; // 30 days
 
-const password = process.env.AUTH_PASSWORD ?? '';
-export const authEnabled = password.length > 0;
+// Flat pause on a failed login — cheap brute-force damping without the
+// bookkeeping of per-IP counters (single-family LAN app).
+const FAILED_LOGIN_DELAY_MS = 350;
 
-const sessions = new Set<string>();
-
-export function logAuthStatus() {
-  if (authEnabled) {
-    console.log('Auth: enabled (AUTH_PASSWORD is set).');
-  } else {
-    console.warn(
-      'Auth: DISABLED — AUTH_PASSWORD is not set, so the API is open to anyone ' +
-        'who can reach it. Set AUTH_PASSWORD to require a login.'
-    );
-  }
+export interface SessionUser {
+  id: number;
+  username: string;
 }
 
+// requireAuth attaches the session's user here; protected routes can cast.
+export interface AuthedRequest extends Request {
+  user?: SessionUser;
+}
+
+// --- Password hashing (node:crypto scrypt — no native dependency) ---
+
+export function hashPassword(password: string): string {
+  const salt = randomBytes(16);
+  const hash = scryptSync(password, salt, 64);
+  return `scrypt:${salt.toString('hex')}:${hash.toString('hex')}`;
+}
+
+export function verifyPassword(password: string, stored: string): boolean {
+  const [scheme, saltHex, hashHex] = stored.split(':');
+  if (scheme !== 'scrypt' || !saltHex || !hashHex) return false;
+  const expected = Buffer.from(hashHex, 'hex');
+  const actual = scryptSync(password, Buffer.from(saltHex, 'hex'), expected.length);
+  return timingSafeEqual(actual, expected);
+}
+
+// --- Users ---
+
+export function anyUsersExist(): boolean {
+  return db.select({ id: users.id }).from(users).limit(1).get() !== undefined;
+}
+
+// Case-insensitive lookup: the schema's UNIQUE index is case-sensitive, so both
+// login and the duplicate-username guard go through lower() instead.
+export function findUserByUsername(username: string) {
+  return db
+    .select()
+    .from(users)
+    .where(sql`lower(${users.username}) = lower(${username})`)
+    .get();
+}
+
+export function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+export const failedLoginDelayMs = FAILED_LOGIN_DELAY_MS;
+
+export const MIN_PASSWORD_LENGTH = 8;
+
+// Shared by POST /api/auth/setup and POST /api/users — returns an error message
+// for the 400 response, or null when the pair is acceptable.
+export function validateNewCredentials(username: unknown, password: unknown): string | null {
+  if (typeof username !== 'string' || username.trim().length === 0) {
+    return 'Username is required';
+  }
+  if (username.trim().length > 64) {
+    return 'Username is too long (max 64 characters)';
+  }
+  if (typeof password !== 'string' || password.length < MIN_PASSWORD_LENGTH) {
+    return `Password must be at least ${MIN_PASSWORD_LENGTH} characters`;
+  }
+  return null;
+}
+
+// --- Cookie / session plumbing ---
+
 function parseCookies(header: string | undefined): Record<string, string> {
   const out: Record<string, string> = {};
   if (!header) return out;
@@ -43,41 +98,65 @@ function parseCookies(header: string | undefined): Record<string, string> {
   return out;
 }
 
-function readSessionToken(req: Request): string | undefined {
+export function readSessionToken(req: Request): string | undefined {
   return parseCookies(req.headers.cookie)[COOKIE_NAME];
 }
 
-export function isAuthenticated(req: Request): boolean {
-  if (!authEnabled) return true;
-  const token = readSessionToken(req);
-  return token != null && sessions.has(token);
-}
-
-export function requireAuth(req: Request, res: Response, next: NextFunction) {
-  if (isAuthenticated(req)) {
-    next();
-    return;
-  }
-  res.status(401).json({ error: 'Unauthorized' });
-}
-
-export function login(res: Response, attempt: unknown): boolean {
-  if (!authEnabled) return true;
-  if (typeof attempt !== 'string' || attempt !== password) return false;
-
+export function createSession(res: Response, userId: number): void {
   const token = randomUUID();
-  sessions.add(token);
+  const expiresAt = new Date(Date.now() + SESSION_TTL_MS).toISOString();
+  db.insert(authSessions).values({ token, userId, expiresAt }).run();
   res.cookie(COOKIE_NAME, token, {
     httpOnly: true,
     sameSite: 'lax',
     path: '/',
     maxAge: SESSION_TTL_MS,
   });
-  return true;
 }
 
-export function logout(req: Request, res: Response) {
+export function destroySession(req: Request, res: Response): void {
   const token = readSessionToken(req);
-  if (token) sessions.delete(token);
+  if (token) db.delete(authSessions).where(eq(authSessions.token, token)).run();
   res.clearCookie(COOKIE_NAME, { path: '/' });
 }
+
+// Resolve the request's session to its user, lazily purging expired sessions.
+// ISO strings compare lexicographically, so `lt` against now-ISO is correct.
+export function getSessionUser(req: Request): SessionUser | null {
+  const token = readSessionToken(req);
+  if (!token) return null;
+
+  db.delete(authSessions).where(lt(authSessions.expiresAt, new Date().toISOString())).run();
+
+  const row = db
+    .select({ id: users.id, username: users.username })
+    .from(authSessions)
+    .innerJoin(users, eq(authSessions.userId, users.id))
+    .where(eq(authSessions.token, token))
+    .get();
+  return row ?? null;
+}
+
+export function requireAuth(req: Request, res: Response, next: NextFunction) {
+  const user = getSessionUser(req);
+  if (!user) {
+    res.status(401).json({ error: 'Unauthorized' });
+    return;
+  }
+  (req as AuthedRequest).user = user;
+  next();
+}
+
+export function logAuthStatus() {
+  if (process.env.AUTH_PASSWORD) {
+    console.warn(
+      'Auth: AUTH_PASSWORD is set but no longer used — auth is account-based now. ' +
+        'Remove MYKINDLEBOX_PASSWORD/AUTH_PASSWORD from your environment.'
+    );
+  }
+  if (anyUsersExist()) {
+    console.log('Auth: user accounts active.');
+  } else {
+    console.log('Auth: no users yet — the app will show the first-run setup screen.');
+  }
+}
diff --git a/mykindlebox/server/db/migrations/0011_add_users.sql b/mykindlebox/server/db/migrations/0011_add_users.sql
new file mode 100644
index 0000000..2c213cd
--- /dev/null
+++ b/mykindlebox/server/db/migrations/0011_add_users.sql
@@ -0,0 +1,18 @@
+CREATE TABLE `auth_sessions` (
+	`token` text PRIMARY KEY NOT NULL,
+	`user_id` integer NOT NULL,
+	`expires_at` text NOT NULL,
+	`created_at` text DEFAULT (current_timestamp) NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `users` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`username` text NOT NULL,
+	`password_hash` text NOT NULL,
+	`theme` text,
+	`weight_unit` text,
+	`created_at` text DEFAULT (current_timestamp) NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `users_username_unique` ON `users` (`username`);
\ No newline at end of file
diff --git a/mykindlebox/server/db/migrations/meta/0011_snapshot.json b/mykindlebox/server/db/migrations/meta/0011_snapshot.json
new file mode 100644
index 0000000..517d44e
--- /dev/null
+++ b/mykindlebox/server/db/migrations/meta/0011_snapshot.json
@@ -0,0 +1,1135 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "c1ddcd85-a331-4843-93a4-43506970264e",
+  "prevId": "8d35ee70-3eaa-430e-b30f-3b440e7f4e32",
+  "tables": {
+    "arba_shows_cache": {
+      "name": "arba_shows_cache",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "fetched_at": {
+          "name": "fetched_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        },
+        "data": {
+          "name": "data",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "auth_sessions": {
+      "name": "auth_sessions",
+      "columns": {
+        "token": {
+          "name": "token",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "auth_sessions_user_id_users_id_fk": {
+          "name": "auth_sessions_user_id_users_id_fk",
+          "tableFrom": "auth_sessions",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "litters": {
+      "name": "litters",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "sire_id": {
+          "name": "sire_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "dam_id": {
+          "name": "dam_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "breed_date": {
+          "name": "breed_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "kindle_date": {
+          "name": "kindle_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "kit_count": {
+          "name": "kit_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "litters_sire_id_rabbits_id_fk": {
+          "name": "litters_sire_id_rabbits_id_fk",
+          "tableFrom": "litters",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "sire_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "litters_dam_id_rabbits_id_fk": {
+          "name": "litters_dam_id_rabbits_id_fk",
+          "tableFrom": "litters",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "dam_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "rabbit_events": {
+      "name": "rabbit_events",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "rabbit_id": {
+          "name": "rabbit_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "type": {
+          "name": "type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "event_date": {
+          "name": "event_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "title": {
+          "name": "title",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "show_class": {
+          "name": "show_class",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "placement": {
+          "name": "placement",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "rabbit_events_rabbit_id_rabbits_id_fk": {
+          "name": "rabbit_events_rabbit_id_rabbits_id_fk",
+          "tableFrom": "rabbit_events",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "rabbit_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {
+        "event_type_check": {
+          "name": "event_type_check",
+          "value": "\"rabbit_events\".\"type\" in ('show', 'sale', 'other')"
+        }
+      }
+    },
+    "rabbits": {
+      "name": "rabbits",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "farm": {
+          "name": "farm",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "sex": {
+          "name": "sex",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'unknown'"
+        },
+        "dob": {
+          "name": "dob",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "weight_lbs": {
+          "name": "weight_lbs",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "ear_number": {
+          "name": "ear_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "location": {
+          "name": "location",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "status": {
+          "name": "status",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'active'"
+        },
+        "breed": {
+          "name": "breed",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "color_name": {
+          "name": "color_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "photo_path": {
+          "name": "photo_path",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "registration_number": {
+          "name": "registration_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "gc_number": {
+          "name": "gc_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "sire_id": {
+          "name": "sire_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "dam_id": {
+          "name": "dam_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "acquired_date": {
+          "name": "acquired_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "death_date": {
+          "name": "death_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_a": {
+          "name": "locus_a",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_b": {
+          "name": "locus_b",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_c": {
+          "name": "locus_c",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_d": {
+          "name": "locus_d",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_e": {
+          "name": "locus_e",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_en": {
+          "name": "locus_en",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "locus_v": {
+          "name": "locus_v",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "sire_name_text": {
+          "name": "sire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "dam_name_text": {
+          "name": "dam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "paternal_grandsire_name_text": {
+          "name": "paternal_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "paternal_granddam_name_text": {
+          "name": "paternal_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "maternal_grandsire_name_text": {
+          "name": "maternal_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "maternal_granddam_name_text": {
+          "name": "maternal_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "pp_grandsire_name_text": {
+          "name": "pp_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "pp_granddam_name_text": {
+          "name": "pp_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "pm_grandsire_name_text": {
+          "name": "pm_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "pm_granddam_name_text": {
+          "name": "pm_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "mp_grandsire_name_text": {
+          "name": "mp_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "mp_granddam_name_text": {
+          "name": "mp_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "mm_grandsire_name_text": {
+          "name": "mm_grandsire_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "mm_granddam_name_text": {
+          "name": "mm_granddam_name_text",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "rabbits_sire_id_rabbits_id_fk": {
+          "name": "rabbits_sire_id_rabbits_id_fk",
+          "tableFrom": "rabbits",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "sire_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "rabbits_dam_id_rabbits_id_fk": {
+          "name": "rabbits_dam_id_rabbits_id_fk",
+          "tableFrom": "rabbits",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "dam_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {
+        "sex_check": {
+          "name": "sex_check",
+          "value": "\"rabbits\".\"sex\" in ('buck', 'doe', 'unknown')"
+        },
+        "status_check": {
+          "name": "status_check",
+          "value": "\"rabbits\".\"status\" in ('active', 'for_sale', 'on_hold', 'sold', 'deceased', 'other')"
+        }
+      }
+    },
+    "settings": {
+      "name": "settings",
+      "columns": {
+        "key": {
+          "name": "key",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "value": {
+          "name": "value",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "show_event_entries": {
+      "name": "show_event_entries",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "show_event_show_id": {
+          "name": "show_event_show_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "rabbit_id": {
+          "name": "rabbit_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "entry_class": {
+          "name": "entry_class",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "entry_number": {
+          "name": "entry_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "show_event_entries_show_event_show_id_show_event_shows_id_fk": {
+          "name": "show_event_entries_show_event_show_id_show_event_shows_id_fk",
+          "tableFrom": "show_event_entries",
+          "tableTo": "show_event_shows",
+          "columnsFrom": [
+            "show_event_show_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "show_event_entries_rabbit_id_rabbits_id_fk": {
+          "name": "show_event_entries_rabbit_id_rabbits_id_fk",
+          "tableFrom": "show_event_entries",
+          "tableTo": "rabbits",
+          "columnsFrom": [
+            "rabbit_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "show_event_judges": {
+      "name": "show_event_judges",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "show_event_show_id": {
+          "name": "show_event_show_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "judge_name": {
+          "name": "judge_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "judge_arba_number": {
+          "name": "judge_arba_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "show_event_judges_show_event_show_id_show_event_shows_id_fk": {
+          "name": "show_event_judges_show_event_show_id_show_event_shows_id_fk",
+          "tableFrom": "show_event_judges",
+          "tableTo": "show_event_shows",
+          "columnsFrom": [
+            "show_event_show_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "show_event_placements": {
+      "name": "show_event_placements",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "entry_id": {
+          "name": "entry_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "placement": {
+          "name": "placement",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "legs_earned": {
+          "name": "legs_earned",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "bob": {
+          "name": "bob",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "bos": {
+          "name": "bos",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "bis": {
+          "name": "bis",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "ris": {
+          "name": "ris",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "show_event_placements_entry_id_unique": {
+          "name": "show_event_placements_entry_id_unique",
+          "columns": [
+            "entry_id"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "show_event_placements_entry_id_show_event_entries_id_fk": {
+          "name": "show_event_placements_entry_id_show_event_entries_id_fk",
+          "tableFrom": "show_event_placements",
+          "tableTo": "show_event_entries",
+          "columnsFrom": [
+            "entry_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "show_event_shows": {
+      "name": "show_event_shows",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "show_event_id": {
+          "name": "show_event_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "sanction_number": {
+          "name": "sanction_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "show_date": {
+          "name": "show_date",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "club_name": {
+          "name": "club_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "show_type": {
+          "name": "show_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "specialty_breed": {
+          "name": "specialty_breed",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "city": {
+          "name": "city",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "state": {
+          "name": "state",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "address": {
+          "name": "address",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "secretary": {
+          "name": "secretary",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "secretary_email": {
+          "name": "secretary_email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "catalog_url": {
+          "name": "catalog_url",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "maps_url": {
+          "name": "maps_url",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "display_order": {
+          "name": "display_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "show_event_shows_show_event_id_show_events_id_fk": {
+          "name": "show_event_shows_show_event_id_show_events_id_fk",
+          "tableFrom": "show_event_shows",
+          "tableTo": "show_events",
+          "columnsFrom": [
+            "show_event_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "show_events": {
+      "name": "show_events",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "notes": {
+          "name": "notes",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "username": {
+          "name": "username",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "password_hash": {
+          "name": "password_hash",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "theme": {
+          "name": "theme",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "weight_unit": {
+          "name": "weight_unit",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(current_timestamp)"
+        }
+      },
+      "indexes": {
+        "users_username_unique": {
+          "name": "users_username_unique",
+          "columns": [
+            "username"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
\ No newline at end of file
diff --git a/mykindlebox/server/db/migrations/meta/_journal.json b/mykindlebox/server/db/migrations/meta/_journal.json
index e9a576e..4b58c0a 100644
--- a/mykindlebox/server/db/migrations/meta/_journal.json
+++ b/mykindlebox/server/db/migrations/meta/_journal.json
@@ -78,6 +78,13 @@
       "when": 1782183462143,
       "tag": "0010_add_judges_placements",
       "breakpoints": true
+    },
+    {
+      "idx": 11,
+      "version": "6",
+      "when": 1783023645526,
+      "tag": "0011_add_users",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/mykindlebox/server/db/schema.ts b/mykindlebox/server/db/schema.ts
index 5a8d9d8..47011b5 100644
--- a/mykindlebox/server/db/schema.ts
+++ b/mykindlebox/server/db/schema.ts
@@ -112,6 +112,37 @@ export const settings = sqliteTable('settings', {
   value: text('value'),
 });
 
+// User accounts (see memory-bank/FEATURE_User_Accounts.md). All users share the
+// same herd — nothing else references users; they are logins, not data owners.
+// `theme`/`weightUnit` are the per-user preferences: NULL means "inherit the
+// global settings-table value" (routes/settings.ts does the merge), so existing
+// global values keep applying until a user picks their own.
+export const users = sqliteTable('users', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  // The UNIQUE index is case-sensitive (drizzle can't emit COLLATE NOCASE);
+  // case-insensitive lookups and the "Rory" vs "rory" duplicate guard are both
+  // enforced with lower() comparisons in auth.ts / routes/users.ts instead.
+  username: text('username').notNull().unique(),
+  passwordHash: text('password_hash').notNull(), // "scrypt:<salt hex>:<hash hex>" — see auth.ts
+  theme: text('theme'),
+  weightUnit: text('weight_unit'),
+  createdAt: text('created_at').notNull().default(sql`(current_timestamp)`),
+});
+
+// Persistent sessions (replaces the old in-memory Set): a server restart or
+// redeploy no longer signs everyone out. Expired rows are purged lazily during
+// session checks. NOTE: the FK cascade is declarative only — the app runs with
+// SQLite foreign_keys OFF (better-sqlite3 default), so user deletion removes
+// sessions explicitly in routes/users.ts.
+export const authSessions = sqliteTable('auth_sessions', {
+  token: text('token').primaryKey(),
+  userId: integer('user_id')
+    .notNull()
+    .references(() => users.id, { onDelete: 'cascade' }),
+  expiresAt: text('expires_at').notNull(),
+  createdAt: text('created_at').notNull().default(sql`(current_timestamp)`),
+});
+
 // Cached snapshot of the ARBA show-search listing (see routes/shows.ts and
 // lib/arba.ts). ARBA sits behind Cloudflare and only updates Mon–Fri, so we
 // scrape at most once a day and serve everything else from here. `data` is the
diff --git a/mykindlebox/server/index.ts b/mykindlebox/server/index.ts
index 9a85ab3..7c8af28 100644
--- a/mykindlebox/server/index.ts
+++ b/mykindlebox/server/index.ts
@@ -3,6 +3,7 @@ import cors from 'cors';
 import { uploadsDir } from './db/client';
 import { logAuthStatus, requireAuth } from './auth';
 import authRouter from './routes/auth';
+import usersRouter from './routes/users';
 import rabbitsRouter from './routes/rabbits';
 import littersRouter from './routes/litters';
 import eventsRouter from './routes/events';
@@ -35,8 +36,9 @@ app.get('/health', (req, res) => {
 // Auth endpoints must stay open so the login screen can reach them.
 app.use('/api/auth', authRouter);
 
-// Everything past here requires a valid session (a no-op when auth is disabled).
+// Everything past here requires a valid session.
 app.use('/uploads', requireAuth, express.static(uploadsDir));
+app.use('/api/users', requireAuth, usersRouter);
 app.use('/api/rabbits', requireAuth, rabbitsRouter);
 app.use('/api/litters', requireAuth, littersRouter);
 app.use('/api/events', requireAuth, eventsRouter);
diff --git a/mykindlebox/server/routes/auth.ts b/mykindlebox/server/routes/auth.ts
index cba2071..3c1723b 100644
--- a/mykindlebox/server/routes/auth.ts
+++ b/mykindlebox/server/routes/auth.ts
@@ -1,25 +1,75 @@
 import { Router } from 'express';
-import { authEnabled, isAuthenticated, login, logout } from '../auth';
+import { db } from '../db/client';
+import { users } from '../db/schema';
+import {
+  anyUsersExist,
+  createSession,
+  destroySession,
+  failedLoginDelayMs,
+  findUserByUsername,
+  getSessionUser,
+  hashPassword,
+  sleep,
+  validateNewCredentials,
+  verifyPassword,
+} from '../auth';
 
 const router = Router();
 
-// Lets the client decide whether to show a login screen at all:
-// `configured: false` means auth is disabled, so the app loads straight through.
+// Drives the client's auth gate: `configured: false` → show the first-run
+// setup screen; unauthenticated → login screen; otherwise `user` identifies
+// the session for the UI.
 router.get('/status', (req, res) => {
-  res.json({ configured: authEnabled, authenticated: isAuthenticated(req) });
+  const user = getSessionUser(req);
+  res.json({
+    configured: anyUsersExist(),
+    authenticated: user !== null,
+    user: user ?? null,
+  });
 });
 
-router.post('/login', (req, res) => {
-  const ok = login(res, req.body?.password);
-  if (!ok) {
-    res.status(401).json({ error: 'Incorrect password' });
+// First-run onboarding: creates the first account and signs it in. Locked to
+// the empty-users state so it can never be used to add accounts later (that's
+// POST /api/users, which requires a session).
+router.post('/setup', (req, res) => {
+  if (anyUsersExist()) {
+    res.status(409).json({ error: 'Setup has already been completed' });
     return;
   }
-  res.json({ authenticated: true });
+
+  const { username, password } = req.body ?? {};
+  const invalid = validateNewCredentials(username, password);
+  if (invalid) {
+    res.status(400).json({ error: invalid });
+    return;
+  }
+
+  const created = db
+    .insert(users)
+    .values({ username: (username as string).trim(), passwordHash: hashPassword(password as string) })
+    .returning({ id: users.id, username: users.username })
+    .get();
+
+  createSession(res, created.id);
+  res.status(201).json({ authenticated: true, user: created });
+});
+
+router.post('/login', async (req, res) => {
+  const { username, password } = req.body ?? {};
+  const user = typeof username === 'string' ? findUserByUsername(username) : undefined;
+
+  if (!user || typeof password !== 'string' || !verifyPassword(password, user.passwordHash)) {
+    await sleep(failedLoginDelayMs); // flat delay = cheap brute-force damping
+    res.status(401).json({ error: 'Incorrect username or password' });
+    return;
+  }
+
+  createSession(res, user.id);
+  res.json({ authenticated: true, user: { id: user.id, username: user.username } });
 });
 
 router.post('/logout', (req, res) => {
-  logout(req, res);
+  destroySession(req, res);
   res.json({ authenticated: false });
 });
 
diff --git a/mykindlebox/server/routes/settings.ts b/mykindlebox/server/routes/settings.ts
index 8d5143f..0cc5b81 100644
--- a/mykindlebox/server/routes/settings.ts
+++ b/mykindlebox/server/routes/settings.ts
@@ -1,40 +1,69 @@
-import { Router } from 'express';
+import { Router, Request } from 'express';
 import { eq } from 'drizzle-orm';
 import { db } from '../db/client';
-import { settings } from '../db/schema';
+import { settings, users } from '../db/schema';
+import { AuthedRequest } from '../auth';
 
 const router = Router();
 
-const ALLOWED_KEYS = ['rabbitry_name', 'weight_unit', 'kit_prefix', 'theme', 'default_breed'] as const;
+// The API shape is unchanged from the single-user days — one flat object with
+// these keys — but storage is now split (FEATURE_User_Accounts.md): `theme` and
+// `weight_unit` are per-user preferences on the caller's `users` row, the rest
+// stay global in the settings table. A NULL user pref falls back to the global
+// value, so a fresh account inherits the rabbitry-wide defaults until the user
+// picks their own. Client consumers (ThemeSync, useWeightUnit, Settings page)
+// are agnostic to the split.
+const GLOBAL_KEYS = ['rabbitry_name', 'kit_prefix', 'default_breed'] as const;
+const USER_KEYS = ['theme', 'weight_unit'] as const;
+const ALLOWED_KEYS = [...GLOBAL_KEYS, ...USER_KEYS] as string[];
 
-router.get('/', (req, res) => {
-  const rows = db.select().from(settings).all();
+function mergedSettings(userId: number): Record<string, string | null> {
   const result: Record<string, string | null> = {};
-  for (const row of rows) {
+  for (const row of db.select().from(settings).all()) {
     result[row.key] = row.value;
   }
-  res.json(result);
+  const prefs = db
+    .select({ theme: users.theme, weightUnit: users.weightUnit })
+    .from(users)
+    .where(eq(users.id, userId))
+    .get();
+  if (prefs?.theme != null) result.theme = prefs.theme;
+  if (prefs?.weightUnit != null) result.weight_unit = prefs.weightUnit;
+  return result;
+}
+
+function currentUserId(req: Request): number {
+  return (req as AuthedRequest).user!.id;
+}
+
+router.get('/', (req, res) => {
+  res.json(mergedSettings(currentUserId(req)));
 });
 
 router.patch('/', (req, res) => {
   const keys = Object.keys(req.body);
-  const unknownKey = keys.find((key) => !ALLOWED_KEYS.includes(key as (typeof ALLOWED_KEYS)[number]));
+  const unknownKey = keys.find((key) => !ALLOWED_KEYS.includes(key));
 
   if (unknownKey) {
     res.status(400).json({ error: `Unknown setting: ${unknownKey}` });
     return;
   }
 
+  const userId = currentUserId(req);
+
+  const userPatch: { theme?: string; weightUnit?: string } = {};
+  if ('theme' in req.body) userPatch.theme = req.body.theme;
+  if ('weight_unit' in req.body) userPatch.weightUnit = req.body.weight_unit;
+  if (Object.keys(userPatch).length > 0) {
+    db.update(users).set(userPatch).where(eq(users.id, userId)).run();
+  }
+
   for (const key of keys) {
+    if ((USER_KEYS as readonly string[]).includes(key)) continue;
     db.update(settings).set({ value: req.body[key] }).where(eq(settings.key, key)).run();
   }
 
-  const rows = db.select().from(settings).all();
-  const result: Record<string, string | null> = {};
-  for (const row of rows) {
-    result[row.key] = row.value;
-  }
-  res.json(result);
+  res.json(mergedSettings(userId));
 });
 
 export default router;
diff --git a/mykindlebox/server/routes/users.ts b/mykindlebox/server/routes/users.ts
new file mode 100644
index 0000000..00b9fd2
--- /dev/null
+++ b/mykindlebox/server/routes/users.ts
@@ -0,0 +1,113 @@
+import { Router, Request } from 'express';
+import { and, asc, eq, ne } from 'drizzle-orm';
+import { db } from '../db/client';
+import { users, authSessions } from '../db/schema';
+import {
+  AuthedRequest,
+  findUserByUsername,
+  hashPassword,
+  readSessionToken,
+  validateNewCredentials,
+  MIN_PASSWORD_LENGTH,
+} from '../auth';
+import { toSnakeCase } from '../utils/case';
+
+// User management (memory-bank/FEATURE_User_Accounts.md). Mounted behind
+// requireAuth; everyone-equal trust model — any signed-in user can add users,
+// reset passwords, and remove accounts other than their own. Password hashes
+// never leave the server.
+
+const router = Router();
+
+function callerId(req: Request): number {
+  return (req as AuthedRequest).user!.id;
+}
+
+router.get('/', (req, res) => {
+  const rows = db
+    .select({ id: users.id, username: users.username, createdAt: users.createdAt })
+    .from(users)
+    .orderBy(asc(users.username))
+    .all();
+  res.json(rows.map(toSnakeCase));
+});
+
+router.post('/', (req, res) => {
+  const { username, password } = req.body ?? {};
+  const invalid = validateNewCredentials(username, password);
+  if (invalid) {
+    res.status(400).json({ error: invalid });
+    return;
+  }
+
+  // Case-insensitive duplicate guard (the UNIQUE index is case-sensitive).
+  if (findUserByUsername((username as string).trim())) {
+    res.status(409).json({ error: 'That username is already taken' });
+    return;
+  }
+
+  const created = db
+    .insert(users)
+    .values({ username: (username as string).trim(), passwordHash: hashPassword(password as string) })
+    .returning({ id: users.id, username: users.username, createdAt: users.createdAt })
+    .get();
+  res.status(201).json(toSnakeCase(created));
+});
+
+// Password reset — also the "someone forgot theirs" path, so no current-password
+// check (everyone equal). Signs the target out everywhere except the caller's
+// own current session (relevant when resetting your own password).
+router.patch('/:id', (req, res) => {
+  const id = Number(req.params.id);
+  const target = db.select().from(users).where(eq(users.id, id)).get();
+  if (!target) {
+    res.status(404).json({ error: 'User not found' });
+    return;
+  }
+
+  const { password } = req.body ?? {};
+  if (typeof password !== 'string' || password.length < MIN_PASSWORD_LENGTH) {
+    res.status(400).json({ error: `Password must be at least ${MIN_PASSWORD_LENGTH} characters` });
+    return;
+  }
+
+  db.update(users).set({ passwordHash: hashPassword(password) }).where(eq(users.id, id)).run();
+
+  const currentToken = readSessionToken(req);
+  db.delete(authSessions)
+    .where(
+      currentToken
+        ? and(eq(authSessions.userId, id), ne(authSessions.token, currentToken))
+        : eq(authSessions.userId, id)
+    )
+    .run();
+
+  res.json({ id, username: target.username });
+});
+
+// You can't delete yourself — which also means the last account can never be
+// deleted (you'd have to be signed in as someone else), so no lockout state.
+router.delete('/:id', (req, res) => {
+  const id = Number(req.params.id);
+  if (id === callerId(req)) {
+    res.status(400).json({ error: 'You cannot delete your own account' });
+    return;
+  }
+
+  const target = db.select({ id: users.id }).from(users).where(eq(users.id, id)).get();
+  if (!target) {
+    res.status(404).json({ error: 'User not found' });
+    return;
+  }
+
+  // Explicit session cleanup: better-sqlite3 runs with foreign_keys OFF, so the
+  // schema's ON DELETE CASCADE is not enforced at runtime.
+  db.transaction((tx) => {
+    tx.delete(authSessions).where(eq(authSessions.userId, id)).run();
+    tx.delete(users).where(eq(users.id, id)).run();
+  });
+
+  res.status(204).end();
+});
+
+export default router;