Add ? prefix for sample files in file-list; fix bootstrap/upgrade

bootstrap.sh wrote .diachron-version to the temp clone directory
instead of the target project, causing upgrade.sh to fail. Fix that
and teach all three scripts (bootstrap, upgrade, diff-upstream) about
the new ? prefix convention in file-list.

Sample files (?-prefixed) are copied on bootstrap but left alone on
upgrade so user modifications are preserved. New samples introduced
in a newer framework version are still copied if absent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,5 +1,5 @@
 **/node_modules
-framework/downloads
+diachron/downloads
-framework/binaries
+diachron/binaries
-framework/.nodejs
+diachron/.nodejs
-framework/.nodejs-config
+diachron/.nodejs-config

.go-version

@@ -0,0 +1 @@
+1.23.6

AGENTS.md

@@ -0,0 +1,44 @@
+# Agent Instructions
+
+Read and follow the instructions in `diachron/AGENTS.md`.  That file
+contains framework conventions, commands, and structure that apply to
+all coding agents working on diachron-based projects.
+
+This project uses **bd** (beads) for issue tracking. Run `bd onboard` to get started.
+
+## Quick Reference
+
+```bash
+bd ready              # Find available work
+bd show <id>          # View issue details
+bd update <id> --status in_progress  # Claim work
+bd close <id>         # Complete work
+bd sync               # Sync with git
+```
+
+## Landing the Plane (Session Completion)
+
+**When ending a work session**, you MUST complete ALL steps below. Work is NOT complete until `git push` succeeds.
+
+**MANDATORY WORKFLOW:**
+
+1. **File issues for remaining work** - Create issues for anything that needs follow-up
+2. **Run quality gates** (if code changed) - Tests, linters, builds
+3. **Update issue status** - Close finished work, update in-progress items
+4. **PUSH TO REMOTE** - This is MANDATORY:
+   ```bash
+   git pull --rebase
+   bd sync
+   git push
+   git status  # MUST show "up to date with origin"
+   ```
+5. **Clean up** - Clear stashes, prune remote branches
+6. **Verify** - All changes committed AND pushed
+7. **Hand off** - Provide context for next session
+
+**CRITICAL RULES:**
+- Work is NOT complete until `git push` succeeds
+- NEVER stop before pushing - that leaves work stranded locally
+- NEVER say "ready to push when you are" - YOU must push
+- If push fails, resolve and retry until it succeeds
+

CLAUDE.md

@@ -3,6 +3,10 @@
 This file provides guidance to Claude Code (claude.ai/code) when working with
 code in this repository.
 
+Read and follow the instructions in `diachron/AGENTS.md`.  That file
+contains framework conventions, commands, and structure that apply to
+all coding agents working on diachron-based projects.
+
 ## Project Overview
 
 Diachron is an opinionated TypeScript/Node.js web framework with a Go-based
@@ -31,14 +35,14 @@ master process. Key design principles:
 
 ### Development
 
-**Check shell scripts (shellcheck + shfmt) (eventually go fmt and prettier or similar):**
+**Check shell scripts (shellcheck + shfmt) (eventually go fmt and biome or similar):**
 ```bash
 ./check.sh
 ```
 
 **Format TypeScript code:**
 ```bash
-cd express && ../cmd pnpm prettier --write .
+cd backend && ../cmd pnpm biome check --write .
 ```
 
 **Build Go master process:**
@@ -54,9 +58,9 @@ cd master && go build
 
 ### Components
 
-- **express/** - TypeScript/Express.js backend application
+- **backend/** - TypeScript/Express.js backend application
 - **master/** - Go-based master process for file watching and process management
-- **framework/** - Managed binaries (Node.js, pnpm), command wrappers, and
+- **diachron/** - Managed binaries (Node.js, pnpm), command wrappers, and
   framework-specific library code
 - **monitor/** - Go file watcher that triggers rebuilds (experimental)
 
@@ -68,7 +72,7 @@ Responsibilities:
 - Proxy web requests to backend workers
 - Behaves identically in all environments (no dev/prod distinction)
 
-### Express App Structure
+### Backend App Structure
 
 - `app.ts` - Main Express application setup with route matching
 - `routes.ts` - Route definitions
@@ -78,7 +82,7 @@ Responsibilities:
 
 ### Framework Command System
 
-Commands flow through: `./cmd` → `framework/cmd.d/*` → `framework/shims/*` → managed binaries in `framework/binaries/`
+Commands flow through: `./cmd` → `diachron/cmd.d/*` → `diachron/shims/*` → managed binaries in `diachron/binaries/`
 
 This ensures consistent tooling versions across the team without system-wide installations.
 
@@ -94,8 +98,8 @@ This ensures consistent tooling versions across the team without system-wide ins
 
 ## Platform Requirements
 
-Linux x86_64 only (currently). Requires:
+Linux or macOS on x86_64. Requires:
-- Modern libc for Go binaries
+- Modern libc for Go binaries (Linux)
 - docker compose (for full stack)
 - fd, shellcheck, shfmt (for development)
 
@@ -108,6 +112,10 @@ Early stage - most implementations are stubs:
 
 # meta
 
+## formatting and sorting
+
+- When a typescript file exports symbols, they should be listed in order
+
 ## guidelines for this document
 
 - Try to keep lines below 80 characters in length, especially prose.  But if

DIACHRON.md

@@ -0,0 +1,184 @@
+# What is diachron?
+
+diachron is a web framework for TypeScript and Node.js.  It uses a Go-based
+master process that handles file watching, building, process management, and
+request proxying.  The application code is TypeScript running on Express.js.
+
+If you're joining a project that uses diachron, this document will orient you.
+
+## Why diachron exists
+
+diachron was built around a few frustrations with mainstream web frameworks:
+
+- **No dev/prod split.**  Most frameworks behave differently in development and
+  production.  diachron doesn't.  The master process watches files, rebuilds,
+  and manages workers the same way everywhere.  There is no `NODE_ENV`.
+
+- **Managed tooling.**  Node.js, pnpm, and other tools are downloaded and
+  pinned to exact versions inside the project.  You don't install them
+  system-wide.  Everyone on the team runs the same binaries.
+
+- **PostgreSQL, directly.**  No ORM, no database abstraction layer.  You write
+  SQL (via Kysely for type safety) and talk to PostgreSQL.  If you need
+  MySQL or SQLite support, this is not the framework for you.
+
+- **Debuggability over magic.**  Everything is explicit and inspectable.
+  Logging and observability are first-class concerns, not afterthoughts.
+
+diachron is inspired by the
+[Taking PHP Seriously](https://slack.engineering/taking-php-seriously/) essay
+from Slack Engineering.  It's designed for small to medium systems (what we
+call "Ring 0 and Ring 1") -- not heavy-compliance or banking-scale
+applications.
+
+## How it works
+
+When you run `./master`, the following happens:
+
+1. The Go master process starts and watches your TypeScript source files.
+2. It builds the backend using `@vercel/ncc`, producing a single bundled JS
+   file.
+3. It starts one or more Node.js worker processes running your Express app.
+4. It proxies HTTP requests from port 8080 to the workers.
+5. When you edit a source file, it rebuilds and restarts the workers
+   automatically.
+6. If a worker crashes, it restarts automatically.
+
+There is no separate "dev server" or "hot module replacement."  The master
+process is the only way to run the application.
+
+## Project structure
+
+A diachron project looks like this:
+
+```
+.
+├── DIACHRON.md      # This file (framework overview for newcomers)
+├── master/          # Go master process (framework-owned)
+├── logger/          # Go logging service (framework-owned)
+├── diachron/        # Managed binaries, shims, framework library
+│   ├── AGENTS.md    # Guide for AI coding agents
+│   ├── binaries/    # Downloaded Node.js, pnpm (gitignored)
+│   ├── cmd.d/       # Commands available via ./cmd
+│   ├── shims/       # Wrappers that use managed binaries
+│   └── ...
+├── backend/         # Your application code
+│   ├── app.ts       # Entry point
+│   ├── routes.ts    # Route definitions
+│   ├── handlers.ts  # Route handlers
+│   ├── services.ts  # Service layer
+│   ├── types.ts     # Application types
+│   ├── config.ts    # Application configuration
+│   └── diachron/    # Framework library code (framework-owned)
+├── cmd              # Run managed commands (./cmd pnpm install, etc.)
+├── develop          # Development-only commands (./develop reset-db, etc.)
+├── mgmt             # Management commands safe for production
+├── sync.sh          # Install/update all dependencies
+├── master           # The compiled master binary (after sync)
+└── docker-compose.yml
+```
+
+### File ownership
+
+There are two owners of files in a diachron project:
+
+- **You own** everything in `backend/` (except `backend/diachron/`), plus
+  `docker-compose.yml`, `package.json`, and anything else you create.
+- **The framework owns** `master/`, `logger/`, `diachron/`,
+  `backend/diachron/`, and the top-level scripts (`cmd`, `develop`, `mgmt`,
+  `sync.sh`, `check.sh`).
+
+Don't modify framework-owned files unless you need to.  This separation
+keeps framework upgrades clean.  If you do need to change framework files
+(especially early on, there are rough edges), you can extract your changes
+as a patch:
+
+```bash
+./diff-upstream.sh          # full diff against upstream
+./diff-upstream.sh --stat   # just list changed files
+```
+
+This diffs every file in `file-list` against the upstream ref recorded in
+`.diachron-version`.
+
+When you do change framework files, make each change in its own commit with
+a clear message explaining what the change is and why it's needed.  Mixing
+framework fixes with application work in a single commit makes it much
+harder to upstream later.  A clean history of discrete, well-explained
+framework commits is the easiest thing to turn into contributions.
+
+## Getting started
+
+```bash
+# Install dependencies and build the master process
+./sync.sh
+
+# Start the application
+./master
+```
+
+The app will be available at `http://localhost:8080`.
+
+You need Linux or macOS on x86_64.  For the full stack (database, Redis,
+etc.), you also need `docker compose`.
+
+## The command system
+
+diachron has three types of commands, separated by intent and safety:
+
+- **`./cmd <command>`** -- Run managed tools (node, pnpm, tsx, etc.).  These
+  use the project's pinned versions, not whatever is installed on your system.
+
+  ```bash
+  ./cmd pnpm install
+  ./cmd pnpm test
+  ```
+
+- **`./mgmt <command>`** -- Management commands that are safe to run in
+  production.  Migrations, user management, that sort of thing.
+
+  ```bash
+  ./mgmt migrate
+  ./mgmt add-user
+  ```
+
+- **`./develop <command>`** -- Development commands that may be destructive.
+  Database resets, fixture loading, etc.  These are gated in production.
+
+  ```bash
+  ./develop reset-db
+  ./develop db           # Open a database shell
+  ```
+
+The rule of thumb: if you'd run it at 3am while tired and worried, it's a
+`mgmt` command.  If it destroys data on purpose, it's a `develop` command.
+
+## Key concepts
+
+### Call and Result
+
+diachron wraps Express's `Request` and `Response` in its own types called
+`Call` and `Result`.  This avoids shadowing and keeps the framework's
+interface distinct from Express internals.  Your handlers receive a `Call`
+and return a `Result`.
+
+### Routes
+
+Routes are defined as data (arrays of `Route` objects in `routes.ts`), not
+through decorators or method chaining.  The framework processes them into
+Express handlers.
+
+### No environment variables for behavior
+
+There is no `NODE_ENV`, no `DEBUG`, no mode switching.  Configuration that
+must vary between deployments (database URLs, secrets) lives in
+configuration files, but the application's behavior doesn't branch on
+environment.
+
+## Further reading
+
+- `README.md` -- Project introduction and requirements
+- `diachron/AGENTS.md` -- Guide for AI coding agents
+- `docs/` -- Design documents and philosophy
+- `docs/commands.md` -- Detailed explanation of the command system
+- `docs/concentric-circles.md` -- What diachron is (and isn't) designed for

README.md

@@ -2,16 +2,13 @@ diachron
 
 ## Introduction
 
-Is your answer to some of these questions "yes"?  If so, you might like
-diachron.  (When it comes to that dev/test/prod one, hear us out first, ok?)
-
 - Do you want to share a lot of backend and frontend code?
 
 - Are you tired of your web stack breaking when you blink too hard?
 
 - Have you read [Taking PHP
-  Seriously](https://slack.engineering/taking-php-seriously/) and wish you had
+  Seriously](https://slack.engineering/taking-php-seriously/) and do you wish
-  something similar for Typescript?
+  you had something similar for Typescript?
 
 - Do you think that ORMs are not all that?  Do you wish you had first class
   unmediated access to your database?  And do you think that database
@@ -35,6 +32,9 @@ diachron.  (When it comes to that dev/test/prod one, hear us out first, ok?)
   you're trying to fix?  We're talking authentication, authorization, XSS,
   https, nested paths, all that stuff.
 
+Is your answer to some of these questions "yes"?  If so, you might like
+diachron.  (When it comes to that dev/test/prod one, hear us out first, ok?)
+
 ## Getting started
 
 Different situations require different getting started docs.
@@ -44,20 +44,28 @@ Different situations require different getting started docs.
 
 ## Requirements
 
-To run diachron, you currently need to have a Linux box running x86_64 with a
+To run diachron, you need Linux or macOS on x86_64.  Linux requires a new
-new enough libc to run golang binaries.  Support for other platforms will come
+enough libc to run golang binaries.
-eventually.
 
 To run a more complete system, you also need to have docker compose installed.
 
+### Database
+
+To connect to the database, you need psql (PostgreSQL client, for
+`./diachron/common.d/db`)
+
+- macOS: `brew install libpq` (and follow the caveat to add it to your PATH),
+  or `brew install postgresql`
+- Debian/Ubuntu: `apt install postgresql-client`
+- Fedora/RHEL: `dnf install postgresql`
+
 ### Development requirements
 
 To hack on diachron itself, you need the following:
 
+- bash
 - docker and docker compose
 - [fd](https://github.com/sharkdp/fd)
 - golang, version 1.23.6 or greater
 - shellcheck
 - shfmt
-
-

TODO.md

@@ -1,22 +1,49 @@
 ## high importance
 
+- Many of the UUIDs generated are not UUIDv7.  This needs to be fixed.
+
 - [ ] Add unit tests all over the place.
   - ⚠️ Huge task - needs breakdown before starting
 
-- [ ] Create initial docker-compose.yml file for local development
+- [ ] map exceptions back to source lines
-  - include most recent stable postgres
-  - include beanstalkd
-  - include memcached
-  - include redis
-  - include mailpit
 
-- [ ] Add first cut at database access.  Remember that ORMs are not all that!
+- [ ] migrations, seeding, fixtures
+
+```sql
+CREATE SCHEMA fw;
+CREATE TABLE fw.users (...);
+CREATE TABLE fw.groups (...);
+```
+
+```sql
+CREATE TABLE app.user_profiles (...);
+CREATE TABLE app.customer_metadata (...);
+```
+
+- [ ] flesh out `mgmt` and `develop` (does not exist yet)
+
+4.1 What belongs in develop
+
+- Create migrations
+- Squash migrations
+- Reset DB
+- Roll back migrations
+- Seed large test datasets
+- Run tests
+- Snapshot / restore local DB state (!!!)
+
+`develop` fails if APP_ENV (or whatever) is `production`.  Or maybe even
+`testing`.
+
+- [ ] Add default user table(s) to database.
 
-- [ ] Add middleware concept
 
 - [ ] Add authentication
-  - password
+  - [ ] password
-  - third party?
+  - [ ] third party?
+
+
+- [ ] Add middleware concept
 
 - [ ] Add authorization
   - for specific routes / resources / etc
@@ -25,6 +52,16 @@
   Partially done; see the /time route.  But we need to figure out where to
   store templates, static files, etc.
 
+- [ ] fix process management: if you control-c `master` process sometimes it
+      leaves around `master-bin`, `logger-bin`, and `diachron:nnnn` processes.
+      Huge problem.
+
+- [ ] Fix format used by master (and logger?)'s output: it should be logfmt
+  - A lot of other stuff should probably be logfmt too but maybe we can get to
+    that later
+
+- [ ] master rebuilds (or tries to) too many times; need some sort of debounce
+      or whatever it's called
 
 ## medium importance
 
@@ -32,10 +69,35 @@
   - with queries
   - convert to logfmt and is there a viewer UI we could pull in and use
     instead?
-  
+
+- [ ] add nested routes.  Note that this might be easy to do without actually
+      changing the logic in express/routes.ts.  A function that takes an array
+      of routes and maps over them rewriting them.  Maybe.
+
+  - [ ] related: add something to do with default templates and stuff... I
+        think we can make handlers a lot shorter to write, sometimes not even
+        necessary at all, with some sane defaults and an easy to use override
+        mechanism
+
+- [ ] time library
+
+- [ ] fill in the rest of express/http-codes.ts
+
+- [ ] fill out express/content-types.ts
+
+
+- [ ] identify redundant "old skool" and ajax routes, factor out their
+      commonalities, etc.
+
 - [ ] figure out and add logging to disk
 
-- [ ] Add email verification
+- [ ] I don't really feel close to satisfied with template location /
+      rendering / etc.  Rethink and rework.
+
+- [ ] Add email verification (this is partially done already)
+
+- [ ] Reading .env files and dealing with the environment should be immune to
+      the extent possible from idiotic errors
 
 - [ ] Update check script:
   - [x] shellcheck on shell scripts
@@ -48,6 +110,17 @@
   - upgrade docs
   - starting docs
   - taking over docs
+  - reference
+  - internals
+
+- [ ] make migration creation default to something like yyyy-mm-dd_ssss (are
+      9999 migrations in a day enough?)
+
+- [ ] clean up `cmd` and `mgmt`: do the right thing with their commonalities
+      and make very plain which is which for what.  Consider additional
+      commands.  Maybe `develop` for specific development tasks,
+      `operate` for operational tasks, and we keep `cmd` for project-specific
+      commands.  Something like that.
 
 
 ## low importance
@@ -72,6 +145,10 @@
     code; repeat
   - Slow start them: only start a few at first
 
+- [ ] in express/user.ts: FIXME: set createdAt and updatedAt to start of epoch
+
+
+
 
 ## finished
 
@@ -99,3 +176,12 @@
 
 - [x] Log to logging service from the express backend
   - Fill out types and functions in `express/logging.ts`
+
+- [x] Add first cut at database access.  Remember that ORMs are not all that!
+
+- [x] Create initial docker-compose.yml file for local development
+  - include most recent stable postgres
+  - include beanstalkd
+  - include memcached
+  - include redis
+  - include mailpit

backend/.npmrc

@@ -0,0 +1 @@
+shamefully-hoist=true

backend/app.ts

@@ -0,0 +1,20 @@
+// This is a sample file provided by diachron.  You are encouraged to modify it.
+
+
+
+
+import { core } from "./diachron/core";
+
+import { routes } from "./routes";
+import {makeApp}from'./diachron/app'
+
+
+const app = makeApp({routes});
+
+
+core.logging.log({ source: "logging", text: ["1"] });
+
+
+
+
+app.start()

backend/biome.jsonc

@@ -17,7 +17,10 @@
     "linter": {
         "enabled": true,
         "rules": {
-            "recommended": true
+            "recommended": true,
+            "style": {
+                "useBlockStatements": "error"
+            }
         }
     },
     "javascript": {

backend/build.sh

@@ -6,4 +6,4 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
-../cmd pnpm ncc build ./app.ts -o dist
+../cmd pnpm ncc build ./app.ts -o dist --source-map

backend/check-deps.ts

@@ -0,0 +1,66 @@
+import { readFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+interface PackageJson {
+    dependencies?: Record<string, string>;
+    devDependencies?: Record<string, string>;
+}
+
+function readPackageJson(path: string): PackageJson {
+    const content = readFileSync(path, "utf-8");
+    return JSON.parse(content);
+}
+
+function getAllDependencyNames(pkg: PackageJson): Set<string> {
+    const names = new Set<string>();
+    for (const name of Object.keys(pkg.dependencies ?? {})) {
+        names.add(name);
+    }
+    for (const name of Object.keys(pkg.devDependencies ?? {})) {
+        names.add(name);
+    }
+    return names;
+}
+
+const diachronPkgPath = join(__dirname, "diachron", "package.json");
+const backendPkgPath = join(__dirname, "package.json");
+
+const diachronPkg = readPackageJson(diachronPkgPath);
+const backendPkg = readPackageJson(backendPkgPath);
+
+const diachronDeps = getAllDependencyNames(diachronPkg);
+const backendDeps = getAllDependencyNames(backendPkg);
+
+const duplicates: string[] = [];
+
+for (const dep of diachronDeps) {
+    if (backendDeps.has(dep)) {
+        duplicates.push(dep);
+    }
+}
+
+if (duplicates.length > 0) {
+    console.error("Error: Duplicate dependencies found.");
+    console.error("");
+    console.error(
+        "The following dependencies exist in both backend/package.json and backend/diachron/package.json:",
+    );
+    console.error("");
+    for (const dep of duplicates.sort()) {
+        console.error(`  - ${dep}`);
+    }
+    console.error("");
+    console.error(
+        "Dependencies in backend/diachron/package.json are provided by the framework",
+    );
+    console.error(
+        "and must not be duplicated in backend/package.json. Remove them from",
+    );
+    console.error("backend/package.json to fix this error.");
+    process.exit(1);
+}
+
+console.log("No duplicate dependencies found.");

backend/check.sh

@@ -8,7 +8,8 @@ check_dir="$DIR"
 
 out_dir="$check_dir/out"
 
-source "$check_dir"/../framework/shims/common
+source "$check_dir"/../diachron/shims/common
-source "$check_dir"/../framework/shims/node.common
+source "$check_dir"/../diachron/shims/node.common
 
+$ROOT/cmd tsx "$check_dir/check-deps.ts"
 $ROOT/cmd pnpm tsc --outDir "$out_dir"

backend/diachron/app.ts

@@ -0,0 +1,137 @@
+// FIXME: rename this to make-app.ts and adjust imports accordingly
+
+import{contentTypes} from './content-types'
+import{httpCodes}from'./http-codes'
+import express, {
+type Express,
+    type NextFunction,
+    type Request as ExpressRequest,
+    type Response as ExpressResponse,
+} from "express";
+import { formatError, formatErrorHtml } from "./errors";
+import {isRedirect,     InternalHandler,    AuthenticationRequired,
+    AuthorizationDenied, Call,type Method, type ProcessedRoute,methodParser, type Result, type Route,massageMethod } from "./types";
+
+
+
+import { cli } from "./cli";
+import{processRoutes}from'./routing'
+
+
+process.on('uncaughtException', (err) => {
+    console.error(formatError(err));
+    process.exit(1);
+});
+
+process.on('unhandledRejection', (reason) => {
+    console.error(formatError(reason));
+});
+
+
+type MakeAppArgs={routes:Route[],
+    processTitle?: string,
+}
+ 
+export interface DiachronApp extends Express {
+    start: () => void 
+}
+
+const makeApp = ({routes, processTitle}: MakeAppArgs) => {
+    if (process.title) {
+        process.title = `diachron:${cli.listen.port}`;
+    }
+
+    const processedRoutes = processRoutes(routes)
+
+    async function handler(
+    req: ExpressRequest,
+    _res: ExpressResponse,
+): Promise<Result> {
+    const method = await methodParser.parseAsync(req.method);
+
+    const byMethod = processedRoutes[method];
+    console.log(
+        "DEBUG: req.path =",
+        JSON.stringify(req.path),
+        "method =",
+        method,
+    );
+    for (const [_idx, pr] of byMethod.entries()) {
+        const match = pr.matcher(req.path);
+        console.log("DEBUG: trying pattern, match result =", match);
+        if (match) {
+            console.log("match", match);
+            const resp = await pr.handler(req, match.params);
+
+            return resp;
+        }
+    }
+
+    const retval: Result = {
+        code: httpCodes.clientErrors.NotFound,
+        contentType: contentTypes.text.plain,
+        result: "not found!",
+    };
+
+    return retval;
+}
+
+    // I don't like going around tsc but this is simple enough that it's probably OK.
+    const app = express() as DiachronApp
+    app.start = function() {
+        this.listen(cli.listen.port, cli.listen.host, () => {
+            console.log(`Listening on ${cli.listen.host}:${cli.listen.port}`);
+        });
+    };
+    
+
+
+
+
+    app.use(express.json())
+
+    app.use(express.urlencoded({ extended: true }));
+
+    app.use(async (req: ExpressRequest, res: ExpressResponse) => {
+        const result0 = await handler(req, res);
+        
+        const code = result0.code.code;
+    const result = result0.result;
+
+    console.log(result);
+
+    // Set any cookies from the result
+    if (result0.cookies) {
+        for (const cookie of result0.cookies) {
+            res.cookie(cookie.name, cookie.value, cookie.options ?? {});
+        }
+    }
+
+    if (isRedirect(result0)) {
+        res.redirect(code, result0.redirect);
+    } else {
+        res.status(code).send(result);
+    }
+    });
+
+    app.use(
+        (
+            err: Error,
+            _req: ExpressRequest,
+            res: ExpressResponse,
+            _next: NextFunction,
+        ) => {
+            console.error(formatError(err));
+            res.status(500).type("html").send(formatErrorHtml(err));
+        },
+    );
+
+return app;
+}
+
+export{makeApp};
+
+function _isPromise<T>(value: T | Promise<T>): value is Promise<T> {
+    return typeof (value as any)?.then === "function";
+}
+

backend/diachron/auth/index.ts

@@ -7,7 +7,14 @@
 // Import authRoutes directly from "./auth/routes" instead.
 
 export { hashPassword, verifyPassword } from "./password";
-export { AuthService } from "./service";
+export { type AuthResult, AuthService } from "./service";
 export { type AuthStore, InMemoryAuthStore } from "./store";
 export { generateToken, hashToken, SESSION_COOKIE_NAME } from "./token";
-export * from "./types";
+export {
+    type AuthMethod,
+    Session,
+    type SessionData,
+    type TokenId,
+    type TokenType,
+    tokenLifetimes,
+} from "./types";

backend/diachron/auth/password.spec.ts

@@ -0,0 +1,80 @@
+// Tests for auth/password.ts
+// Pure unit tests - no database needed
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { hashPassword, verifyPassword } from "./password";
+
+describe("password", () => {
+    describe("hashPassword", () => {
+        it("returns a scrypt formatted hash", async () => {
+            const hash = await hashPassword("testpassword");
+            assert.ok(hash.startsWith("$scrypt$"));
+        });
+
+        it("includes all scrypt parameters", async () => {
+            const hash = await hashPassword("testpassword");
+            const parts = hash.split("$");
+            // Format: $scrypt$N$r$p$salt$hash
+            assert.equal(parts.length, 7);
+            assert.equal(parts[0], "");
+            assert.equal(parts[1], "scrypt");
+            // N, r, p should be numbers
+            assert.ok(!Number.isNaN(parseInt(parts[2], 10)));
+            assert.ok(!Number.isNaN(parseInt(parts[3], 10)));
+            assert.ok(!Number.isNaN(parseInt(parts[4], 10)));
+        });
+
+        it("generates different hashes for same password (different salt)", async () => {
+            const hash1 = await hashPassword("testpassword");
+            const hash2 = await hashPassword("testpassword");
+            assert.notEqual(hash1, hash2);
+        });
+    });
+
+    describe("verifyPassword", () => {
+        it("returns true for correct password", async () => {
+            const hash = await hashPassword("correctpassword");
+            const result = await verifyPassword("correctpassword", hash);
+            assert.equal(result, true);
+        });
+
+        it("returns false for incorrect password", async () => {
+            const hash = await hashPassword("correctpassword");
+            const result = await verifyPassword("wrongpassword", hash);
+            assert.equal(result, false);
+        });
+
+        it("throws for invalid hash format", async () => {
+            await assert.rejects(
+                verifyPassword("password", "invalid-hash"),
+                /Invalid password hash format/,
+            );
+        });
+
+        it("throws for non-scrypt hash", async () => {
+            await assert.rejects(
+                verifyPassword("password", "$bcrypt$10$salt$hash"),
+                /Invalid password hash format/,
+            );
+        });
+
+        it("works with empty password", async () => {
+            const hash = await hashPassword("");
+            const result = await verifyPassword("", hash);
+            assert.equal(result, true);
+        });
+
+        it("works with unicode password", async () => {
+            const hash = await hashPassword("p@$$w0rd\u{1F511}");
+            const result = await verifyPassword("p@$$w0rd\u{1F511}", hash);
+            assert.equal(result, true);
+        });
+
+        it("is case sensitive", async () => {
+            const hash = await hashPassword("Password");
+            const result = await verifyPassword("password", hash);
+            assert.equal(result, false);
+        });
+    });
+});

backend/diachron/auth/password.ts

@@ -28,8 +28,11 @@ function scryptAsync(
 ): Promise<Buffer> {
     return new Promise((resolve, reject) => {
         scrypt(password, salt, keylen, options, (err, derivedKey) => {
-            if (err) reject(err);
+            if (err) {
-            else resolve(derivedKey);
+                reject(err);
+            } else {
+                resolve(derivedKey);
+            }
         });
     });
 }

backend/diachron/auth/routes.ts

@@ -5,7 +5,7 @@
 import { z } from "zod";
 import { contentTypes } from "../content-types";
 import { httpCodes } from "../http-codes";
-import { services } from "../services";
+import { request } from "../request";
 import type { Call, Result, Route } from "../types";
 import {
     forgotPasswordInputParser,
@@ -39,7 +39,7 @@ const loginHandler = async (call: Call): Promise<Result> => {
         const body = call.request.body;
         const { email, password } = loginInputParser.parse(body);
 
-        const result = await services.auth.login(email, password, "cookie", {
+        const result = await request.auth.login(email, password, "cookie", {
             userAgent: call.request.get("User-Agent"),
             ipAddress: call.request.ip,
         });
@@ -72,9 +72,9 @@ const loginHandler = async (call: Call): Promise<Result> => {
 
 // POST /auth/logout
 const logoutHandler = async (call: Call): Promise<Result> => {
-    const token = services.auth.extractToken(call.request);
+    const token = request.auth.extractToken(call.request);
     if (token) {
-        await services.auth.logout(token);
+        await request.auth.logout(token);
     }
 
     return jsonResponse(httpCodes.success.OK, { message: "Logged out" });
@@ -87,7 +87,7 @@ const registerHandler = async (call: Call): Promise<Result> => {
         const { email, password, displayName } =
             registerInputParser.parse(body);
 
-        const result = await services.auth.register(
+        const result = await request.auth.register(
             email,
             password,
             displayName,
@@ -128,7 +128,7 @@ const forgotPasswordHandler = async (call: Call): Promise<Result> => {
         const body = call.request.body;
         const { email } = forgotPasswordInputParser.parse(body);
 
-        const result = await services.auth.createPasswordResetToken(email);
+        const result = await request.auth.createPasswordResetToken(email);
 
         // Always return success (don't reveal if email exists)
         if (result) {
@@ -159,7 +159,7 @@ const resetPasswordHandler = async (call: Call): Promise<Result> => {
         const body = call.request.body;
         const { token, password } = resetPasswordInputParser.parse(body);
 
-        const result = await services.auth.resetPassword(token, password);
+        const result = await request.auth.resetPassword(token, password);
 
         if (!result.success) {
             return errorResponse(
@@ -195,7 +195,7 @@ const verifyEmailHandler = async (call: Call): Promise<Result> => {
         );
     }
 
-    const result = await services.auth.verifyEmail(token);
+    const result = await request.auth.verifyEmail(token);
 
     if (!result.success) {
         return errorResponse(httpCodes.clientErrors.BadRequest, result.error);

backend/diachron/auth/service.spec.ts

@@ -0,0 +1,419 @@
+// Tests for auth/service.ts
+// Uses InMemoryAuthStore - no database needed
+
+import assert from "node:assert/strict";
+import { beforeEach, describe, it } from "node:test";
+import { AuthService } from "./service";
+import { InMemoryAuthStore } from "./store";
+
+describe("AuthService", () => {
+    let store: InMemoryAuthStore;
+    let service: AuthService;
+
+    beforeEach(() => {
+        store = new InMemoryAuthStore();
+        service = new AuthService(store);
+    });
+
+    describe("register", () => {
+        it("creates a new user", async () => {
+            const result = await service.register(
+                "test@example.com",
+                "password123",
+                "Test User",
+            );
+
+            assert.equal(result.success, true);
+            if (result.success) {
+                assert.equal(result.user.email, "test@example.com");
+                assert.equal(result.user.displayName, "Test User");
+                assert.ok(result.verificationToken.length > 0);
+            }
+        });
+
+        it("fails when email already registered", async () => {
+            await service.register("test@example.com", "password123");
+            const result = await service.register(
+                "test@example.com",
+                "password456",
+            );
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(result.error, "Email already registered");
+            }
+        });
+
+        it("creates user without displayName", async () => {
+            const result = await service.register(
+                "test@example.com",
+                "password123",
+            );
+
+            assert.equal(result.success, true);
+            if (result.success) {
+                assert.equal(result.user.displayName, undefined);
+            }
+        });
+    });
+
+    describe("login", () => {
+        beforeEach(async () => {
+            // Create and verify a user
+            const result = await service.register(
+                "test@example.com",
+                "password123",
+                "Test User",
+            );
+            if (result.success) {
+                // Verify email to activate user
+                await service.verifyEmail(result.verificationToken);
+            }
+        });
+
+        it("succeeds with correct credentials", async () => {
+            const result = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+
+            assert.equal(result.success, true);
+            if (result.success) {
+                assert.ok(result.token.length > 0);
+                assert.equal(result.user.email, "test@example.com");
+            }
+        });
+
+        it("fails with wrong password", async () => {
+            const result = await service.login(
+                "test@example.com",
+                "wrongpassword",
+                "cookie",
+            );
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(result.error, "Invalid credentials");
+            }
+        });
+
+        it("fails with unknown email", async () => {
+            const result = await service.login(
+                "unknown@example.com",
+                "password123",
+                "cookie",
+            );
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(result.error, "Invalid credentials");
+            }
+        });
+
+        it("fails for inactive user", async () => {
+            // Create a user but don't verify email (stays pending)
+            await service.register("pending@example.com", "password123");
+
+            const result = await service.login(
+                "pending@example.com",
+                "password123",
+                "cookie",
+            );
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(result.error, "Account is not active");
+            }
+        });
+
+        it("stores metadata", async () => {
+            const result = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+                { userAgent: "TestAgent", ipAddress: "192.168.1.1" },
+            );
+
+            assert.equal(result.success, true);
+        });
+    });
+
+    describe("validateToken", () => {
+        let token: string;
+
+        beforeEach(async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            if (regResult.success) {
+                await service.verifyEmail(regResult.verificationToken);
+            }
+
+            const loginResult = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+            if (loginResult.success) {
+                token = loginResult.token;
+            }
+        });
+
+        it("returns authenticated for valid token", async () => {
+            const result = await service.validateToken(token);
+
+            assert.equal(result.authenticated, true);
+            if (result.authenticated) {
+                assert.equal(result.user.email, "test@example.com");
+                assert.notEqual(result.session, null);
+            }
+        });
+
+        it("returns unauthenticated for invalid token", async () => {
+            const result = await service.validateToken("invalid-token");
+
+            assert.equal(result.authenticated, false);
+            assert.equal(result.user.isAnonymous(), true);
+            assert.equal(result.session, null);
+        });
+    });
+
+    describe("logout", () => {
+        it("invalidates the session", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            if (regResult.success) {
+                await service.verifyEmail(regResult.verificationToken);
+            }
+
+            const loginResult = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+            assert.equal(loginResult.success, true);
+            if (!loginResult.success) return;
+
+            const token = loginResult.token;
+
+            // Token should be valid before logout
+            const beforeLogout = await service.validateToken(token);
+            assert.equal(beforeLogout.authenticated, true);
+
+            // Logout
+            await service.logout(token);
+
+            // Token should be invalid after logout
+            const afterLogout = await service.validateToken(token);
+            assert.equal(afterLogout.authenticated, false);
+        });
+    });
+
+    describe("logoutAllSessions", () => {
+        it("invalidates all user sessions", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            if (regResult.success) {
+                await service.verifyEmail(regResult.verificationToken);
+            }
+
+            // Create multiple sessions
+            const login1 = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+            const login2 = await service.login(
+                "test@example.com",
+                "password123",
+                "bearer",
+            );
+
+            assert.equal(login1.success, true);
+            assert.equal(login2.success, true);
+            if (!login1.success || !login2.success) return;
+
+            // Both should be valid
+            const before1 = await service.validateToken(login1.token);
+            const before2 = await service.validateToken(login2.token);
+            assert.equal(before1.authenticated, true);
+            assert.equal(before2.authenticated, true);
+
+            // Logout all
+            const user = await store.getUserByEmail("test@example.com");
+            const count = await service.logoutAllSessions(user!.id);
+            assert.equal(count, 2);
+
+            // Both should be invalid
+            const after1 = await service.validateToken(login1.token);
+            const after2 = await service.validateToken(login2.token);
+            assert.equal(after1.authenticated, false);
+            assert.equal(after2.authenticated, false);
+        });
+    });
+
+    describe("verifyEmail", () => {
+        it("activates user with valid token", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            assert.equal(regResult.success, true);
+            if (!regResult.success) return;
+
+            const result = await service.verifyEmail(
+                regResult.verificationToken,
+            );
+            assert.equal(result.success, true);
+
+            // User should now be active and can login
+            const loginResult = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+            assert.equal(loginResult.success, true);
+        });
+
+        it("fails with invalid token", async () => {
+            const result = await service.verifyEmail("invalid-token");
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(
+                    result.error,
+                    "Invalid or expired verification token",
+                );
+            }
+        });
+
+        it("fails when token already used", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            assert.equal(regResult.success, true);
+            if (!regResult.success) return;
+
+            // First verification succeeds
+            const result1 = await service.verifyEmail(
+                regResult.verificationToken,
+            );
+            assert.equal(result1.success, true);
+
+            // Second verification fails (token deleted)
+            const result2 = await service.verifyEmail(
+                regResult.verificationToken,
+            );
+            assert.equal(result2.success, false);
+        });
+    });
+
+    describe("createPasswordResetToken", () => {
+        it("returns token for existing user", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            assert.equal(regResult.success, true);
+
+            const result =
+                await service.createPasswordResetToken("test@example.com");
+            assert.notEqual(result, null);
+            assert.ok(result!.token.length > 0);
+        });
+
+        it("returns null for unknown email", async () => {
+            const result = await service.createPasswordResetToken(
+                "unknown@example.com",
+            );
+            assert.equal(result, null);
+        });
+    });
+
+    describe("resetPassword", () => {
+        it("changes password with valid token", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "oldpassword",
+            );
+            if (regResult.success) {
+                await service.verifyEmail(regResult.verificationToken);
+            }
+
+            const resetToken =
+                await service.createPasswordResetToken("test@example.com");
+            assert.notEqual(resetToken, null);
+
+            const result = await service.resetPassword(
+                resetToken!.token,
+                "newpassword",
+            );
+            assert.equal(result.success, true);
+
+            // Old password should no longer work
+            const loginOld = await service.login(
+                "test@example.com",
+                "oldpassword",
+                "cookie",
+            );
+            assert.equal(loginOld.success, false);
+
+            // New password should work
+            const loginNew = await service.login(
+                "test@example.com",
+                "newpassword",
+                "cookie",
+            );
+            assert.equal(loginNew.success, true);
+        });
+
+        it("fails with invalid token", async () => {
+            const result = await service.resetPassword(
+                "invalid-token",
+                "newpassword",
+            );
+
+            assert.equal(result.success, false);
+            if (!result.success) {
+                assert.equal(result.error, "Invalid or expired reset token");
+            }
+        });
+
+        it("invalidates all existing sessions", async () => {
+            const regResult = await service.register(
+                "test@example.com",
+                "password123",
+            );
+            if (regResult.success) {
+                await service.verifyEmail(regResult.verificationToken);
+            }
+
+            // Create a session
+            const loginResult = await service.login(
+                "test@example.com",
+                "password123",
+                "cookie",
+            );
+            assert.equal(loginResult.success, true);
+            if (!loginResult.success) return;
+
+            const sessionToken = loginResult.token;
+
+            // Reset password
+            const resetToken =
+                await service.createPasswordResetToken("test@example.com");
+            await service.resetPassword(resetToken!.token, "newpassword");
+
+            // Old session should be invalid
+            const validateResult = await service.validateToken(sessionToken);
+            assert.equal(validateResult.authenticated, false);
+        });
+    });
+});

backend/diachron/auth/service.ts

@@ -4,7 +4,12 @@
 // password reset, and email verification.
 
 import type { Request as ExpressRequest } from "express";
-import { AnonymousUser, type MaybeUser, type User, type UserId } from "../user";
+import {
+    type AnonymousUser,
+    anonymousUser,
+    type User,
+    type UserId,
+} from "../user";
 import { hashPassword, verifyPassword } from "./password";
 import type { AuthStore } from "./store";
 import {
@@ -12,7 +17,7 @@ import {
     parseAuthorizationHeader,
     SESSION_COOKIE_NAME,
 } from "./token";
-import { type TokenId, tokenLifetimes } from "./types";
+import { type SessionData, type TokenId, tokenLifetimes } from "./types";
 
 type LoginResult =
     | { success: true; token: string; user: User }
@@ -24,6 +29,11 @@ type RegisterResult =
 
 type SimpleResult = { success: true } | { success: false; error: string };
 
+// Result of validating a request/token - contains both user and session
+export type AuthResult =
+    | { authenticated: true; user: User; session: SessionData }
+    | { authenticated: false; user: AnonymousUser; session: null };
+
 export class AuthService {
     constructor(private store: AuthStore) {}
 
@@ -68,7 +78,7 @@ export class AuthService {
 
     // === Session Validation ===
 
-    async validateRequest(request: ExpressRequest): Promise<MaybeUser> {
+    async validateRequest(request: ExpressRequest): Promise<AuthResult> {
         // Try cookie first (for web requests)
         let token = this.extractCookieToken(request);
 
@@ -78,38 +88,40 @@ export class AuthService {
         }
 
         if (!token) {
-            return AnonymousUser;
+            return { authenticated: false, user: anonymousUser, session: null };
         }
 
         return this.validateToken(token);
     }
 
-    async validateToken(token: string): Promise<MaybeUser> {
+    async validateToken(token: string): Promise<AuthResult> {
         const tokenId = hashToken(token) as TokenId;
         const session = await this.store.getSession(tokenId);
 
         if (!session) {
-            return AnonymousUser;
+            return { authenticated: false, user: anonymousUser, session: null };
         }
 
         if (session.tokenType !== "session") {
-            return AnonymousUser;
+            return { authenticated: false, user: anonymousUser, session: null };
         }
 
         const user = await this.store.getUserById(session.userId as UserId);
         if (!user || !user.isActive()) {
-            return AnonymousUser;
+            return { authenticated: false, user: anonymousUser, session: null };
         }
 
         // Update last used (fire and forget)
         this.store.updateLastUsed(tokenId).catch(() => {});
 
-        return user;
+        return { authenticated: true, user, session };
     }
 
     private extractCookieToken(request: ExpressRequest): string | null {
         const cookies = request.get("Cookie");
-        if (!cookies) return null;
+        if (!cookies) {
+            return null;
+        }
 
         for (const cookie of cookies.split(";")) {
             const [name, ...valueParts] = cookie.trim().split("=");
@@ -240,7 +252,9 @@ export class AuthService {
     extractToken(request: ExpressRequest): string | null {
         // Try Authorization header first
         const token = parseAuthorizationHeader(request.get("Authorization"));
-        if (token) return token;
+        if (token) {
+            return token;
+        }
 
         // Try cookie
         return this.extractCookieToken(request);

backend/diachron/auth/store.spec.ts

@@ -0,0 +1,321 @@
+// Tests for auth/store.ts (InMemoryAuthStore)
+// Pure unit tests - no database needed
+
+import assert from "node:assert/strict";
+import { after, before, beforeEach, describe, it } from "node:test";
+import type { UserId } from "../user";
+import { InMemoryAuthStore } from "./store";
+import { hashToken } from "./token";
+import type { TokenId } from "./types";
+
+describe("InMemoryAuthStore", () => {
+    let store: InMemoryAuthStore;
+
+    beforeEach(() => {
+        store = new InMemoryAuthStore();
+    });
+
+    describe("createUser", () => {
+        it("creates a user with pending status", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+                displayName: "Test User",
+            });
+
+            assert.equal(user.email, "test@example.com");
+            assert.equal(user.displayName, "Test User");
+            assert.equal(user.status, "pending");
+        });
+
+        it("creates a user without displayName", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            assert.equal(user.email, "test@example.com");
+            assert.equal(user.displayName, undefined);
+        });
+
+        it("generates a unique id", async () => {
+            const user1 = await store.createUser({
+                email: "test1@example.com",
+                passwordHash: "hash123",
+            });
+            const user2 = await store.createUser({
+                email: "test2@example.com",
+                passwordHash: "hash456",
+            });
+
+            assert.notEqual(user1.id, user2.id);
+        });
+    });
+
+    describe("getUserByEmail", () => {
+        it("returns user when found", async () => {
+            await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const user = await store.getUserByEmail("test@example.com");
+            assert.notEqual(user, null);
+            assert.equal(user!.email, "test@example.com");
+        });
+
+        it("is case-insensitive", async () => {
+            await store.createUser({
+                email: "Test@Example.COM",
+                passwordHash: "hash123",
+            });
+
+            const user = await store.getUserByEmail("test@example.com");
+            assert.notEqual(user, null);
+        });
+
+        it("returns null when not found", async () => {
+            const user = await store.getUserByEmail("notfound@example.com");
+            assert.equal(user, null);
+        });
+    });
+
+    describe("getUserById", () => {
+        it("returns user when found", async () => {
+            const created = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const user = await store.getUserById(created.id);
+            assert.notEqual(user, null);
+            assert.equal(user!.id, created.id);
+        });
+
+        it("returns null when not found", async () => {
+            const user = await store.getUserById("nonexistent" as UserId);
+            assert.equal(user, null);
+        });
+    });
+
+    describe("getUserPasswordHash", () => {
+        it("returns hash when found", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const hash = await store.getUserPasswordHash(user.id);
+            assert.equal(hash, "hash123");
+        });
+
+        it("returns null when not found", async () => {
+            const hash = await store.getUserPasswordHash(
+                "nonexistent" as UserId,
+            );
+            assert.equal(hash, null);
+        });
+    });
+
+    describe("setUserPassword", () => {
+        it("updates password hash", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "oldhash",
+            });
+
+            await store.setUserPassword(user.id, "newhash");
+
+            const hash = await store.getUserPasswordHash(user.id);
+            assert.equal(hash, "newhash");
+        });
+    });
+
+    describe("updateUserEmailVerified", () => {
+        it("sets user status to active", async () => {
+            const created = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+            assert.equal(created.status, "pending");
+
+            await store.updateUserEmailVerified(created.id);
+
+            const user = await store.getUserById(created.id);
+            assert.equal(user!.status, "active");
+        });
+    });
+
+    describe("createSession", () => {
+        it("creates a session with token", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token, session } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000),
+            });
+
+            assert.ok(token.length > 0);
+            assert.equal(session.userId, user.id);
+            assert.equal(session.tokenType, "session");
+            assert.equal(session.authMethod, "cookie");
+        });
+
+        it("stores metadata", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { session } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000),
+                userAgent: "Mozilla/5.0",
+                ipAddress: "127.0.0.1",
+            });
+
+            assert.equal(session.userAgent, "Mozilla/5.0");
+            assert.equal(session.ipAddress, "127.0.0.1");
+        });
+    });
+
+    describe("getSession", () => {
+        it("returns session when found and not expired", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000), // 1 hour from now
+            });
+
+            const tokenId = hashToken(token) as TokenId;
+            const session = await store.getSession(tokenId);
+            assert.notEqual(session, null);
+            assert.equal(session!.userId, user.id);
+        });
+
+        it("returns null for expired session", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() - 1000), // Expired 1 second ago
+            });
+
+            const tokenId = hashToken(token) as TokenId;
+            const session = await store.getSession(tokenId);
+            assert.equal(session, null);
+        });
+
+        it("returns null for nonexistent session", async () => {
+            const session = await store.getSession("nonexistent" as TokenId);
+            assert.equal(session, null);
+        });
+    });
+
+    describe("deleteSession", () => {
+        it("removes the session", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000),
+            });
+
+            const tokenId = hashToken(token) as TokenId;
+            await store.deleteSession(tokenId);
+
+            const session = await store.getSession(tokenId);
+            assert.equal(session, null);
+        });
+    });
+
+    describe("deleteUserSessions", () => {
+        it("removes all sessions for user", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token: token1 } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000),
+            });
+
+            const { token: token2 } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "bearer",
+                expiresAt: new Date(Date.now() + 3600000),
+            });
+
+            const count = await store.deleteUserSessions(user.id);
+            assert.equal(count, 2);
+
+            const session1 = await store.getSession(
+                hashToken(token1) as TokenId,
+            );
+            const session2 = await store.getSession(
+                hashToken(token2) as TokenId,
+            );
+            assert.equal(session1, null);
+            assert.equal(session2, null);
+        });
+
+        it("returns 0 when user has no sessions", async () => {
+            const count = await store.deleteUserSessions(
+                "nonexistent" as UserId,
+            );
+            assert.equal(count, 0);
+        });
+    });
+
+    describe("updateLastUsed", () => {
+        it("updates lastUsedAt timestamp", async () => {
+            const user = await store.createUser({
+                email: "test@example.com",
+                passwordHash: "hash123",
+            });
+
+            const { token } = await store.createSession({
+                userId: user.id,
+                tokenType: "session",
+                authMethod: "cookie",
+                expiresAt: new Date(Date.now() + 3600000),
+            });
+
+            const tokenId = hashToken(token) as TokenId;
+            const beforeUpdate = await store.getSession(tokenId);
+            assert.equal(beforeUpdate!.lastUsedAt, undefined);
+
+            await store.updateLastUsed(tokenId);
+
+            const afterUpdate = await store.getSession(tokenId);
+            assert.ok(afterUpdate!.lastUsedAt instanceof Date);
+        });
+    });
+});

backend/diachron/auth/store.ts

@@ -3,7 +3,7 @@
 // Authentication storage interface and in-memory implementation.
 // The interface allows easy migration to PostgreSQL later.
 
-import { User, type UserId } from "../user";
+import { AuthenticatedUser, type User, type UserId } from "../user";
 import { generateToken, hashToken } from "./token";
 import type { AuthMethod, SessionData, TokenId, TokenType } from "./types";
 
@@ -75,7 +75,9 @@ export class InMemoryAuthStore implements AuthStore {
 
     async getSession(tokenId: TokenId): Promise<SessionData | null> {
         const session = this.sessions.get(tokenId);
-        if (!session) return null;
+        if (!session) {
+            return null;
+        }
 
         // Check expiration
         if (new Date() > session.expiresAt) {
@@ -110,7 +112,9 @@ export class InMemoryAuthStore implements AuthStore {
 
     async getUserByEmail(email: string): Promise<User | null> {
         const userId = this.usersByEmail.get(email.toLowerCase());
-        if (!userId) return null;
+        if (!userId) {
+            return null;
+        }
         return this.users.get(userId) ?? null;
     }
 
@@ -119,7 +123,7 @@ export class InMemoryAuthStore implements AuthStore {
     }
 
     async createUser(data: CreateUserData): Promise<User> {
-        const user = User.create(data.email, {
+        const user = AuthenticatedUser.create(data.email, {
             displayName: data.displayName,
             status: "pending", // Pending until email verified
         });
@@ -147,7 +151,7 @@ export class InMemoryAuthStore implements AuthStore {
         const user = this.users.get(userId);
         if (user) {
             // Create new user with active status
-            const updatedUser = User.create(user.email, {
+            const updatedUser = AuthenticatedUser.create(user.email, {
                 id: user.id,
                 displayName: user.displayName,
                 status: "active",

backend/diachron/auth/token.spec.ts

@@ -0,0 +1,94 @@
+// Tests for auth/token.ts
+// Pure unit tests - no database needed
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+    generateToken,
+    hashToken,
+    parseAuthorizationHeader,
+    SESSION_COOKIE_NAME,
+} from "./token";
+
+describe("token", () => {
+    describe("generateToken", () => {
+        it("generates a non-empty string", () => {
+            const token = generateToken();
+            assert.equal(typeof token, "string");
+            assert.ok(token.length > 0);
+        });
+
+        it("generates unique tokens", () => {
+            const tokens = new Set<string>();
+            for (let i = 0; i < 100; i++) {
+                tokens.add(generateToken());
+            }
+            assert.equal(tokens.size, 100);
+        });
+
+        it("generates base64url encoded tokens", () => {
+            const token = generateToken();
+            // base64url uses A-Z, a-z, 0-9, -, _
+            assert.match(token, /^[A-Za-z0-9_-]+$/);
+        });
+    });
+
+    describe("hashToken", () => {
+        it("returns a hex string", () => {
+            const hash = hashToken("test-token");
+            assert.match(hash, /^[a-f0-9]+$/);
+        });
+
+        it("returns consistent hash for same input", () => {
+            const hash1 = hashToken("test-token");
+            const hash2 = hashToken("test-token");
+            assert.equal(hash1, hash2);
+        });
+
+        it("returns different hash for different input", () => {
+            const hash1 = hashToken("token-1");
+            const hash2 = hashToken("token-2");
+            assert.notEqual(hash1, hash2);
+        });
+
+        it("returns 64 character hash (SHA-256)", () => {
+            const hash = hashToken("test-token");
+            assert.equal(hash.length, 64);
+        });
+    });
+
+    describe("parseAuthorizationHeader", () => {
+        it("returns null for undefined header", () => {
+            assert.equal(parseAuthorizationHeader(undefined), null);
+        });
+
+        it("returns null for empty string", () => {
+            assert.equal(parseAuthorizationHeader(""), null);
+        });
+
+        it("returns null for non-bearer auth", () => {
+            assert.equal(parseAuthorizationHeader("Basic abc123"), null);
+        });
+
+        it("returns null for malformed header", () => {
+            assert.equal(parseAuthorizationHeader("Bearer"), null);
+            assert.equal(parseAuthorizationHeader("Bearer token extra"), null);
+        });
+
+        it("extracts token from valid bearer header", () => {
+            assert.equal(parseAuthorizationHeader("Bearer abc123"), "abc123");
+        });
+
+        it("is case-insensitive for Bearer keyword", () => {
+            assert.equal(parseAuthorizationHeader("bearer abc123"), "abc123");
+            assert.equal(parseAuthorizationHeader("BEARER abc123"), "abc123");
+        });
+    });
+
+    describe("SESSION_COOKIE_NAME", () => {
+        it("is defined", () => {
+            assert.equal(typeof SESSION_COOKIE_NAME, "string");
+            assert.ok(SESSION_COOKIE_NAME.length > 0);
+        });
+    });
+});

backend/diachron/auth/token.ts

@@ -19,7 +19,9 @@ function hashToken(token: string): string {
 
 // Parse token from Authorization header
 function parseAuthorizationHeader(header: string | undefined): string | null {
-    if (!header) return null;
+    if (!header) {
+        return null;
+    }
 
     const parts = header.split(" ");
     if (parts.length !== 2 || parts[0].toLowerCase() !== "bearer") {

backend/diachron/auth/types.spec.ts

@@ -0,0 +1,253 @@
+// Tests for auth/types.ts
+// Pure unit tests - no database needed
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { z } from "zod";
+import { AuthenticatedUser, anonymousUser } from "../user";
+import {
+    authMethodParser,
+    forgotPasswordInputParser,
+    loginInputParser,
+    registerInputParser,
+    resetPasswordInputParser,
+    Session,
+    sessionDataParser,
+    tokenLifetimes,
+    tokenTypeParser,
+} from "./types";
+
+describe("auth/types", () => {
+    describe("tokenTypeParser", () => {
+        it("accepts valid token types", () => {
+            assert.equal(tokenTypeParser.parse("session"), "session");
+            assert.equal(
+                tokenTypeParser.parse("password_reset"),
+                "password_reset",
+            );
+            assert.equal(tokenTypeParser.parse("email_verify"), "email_verify");
+        });
+
+        it("rejects invalid token types", () => {
+            assert.throws(() => tokenTypeParser.parse("invalid"));
+        });
+    });
+
+    describe("authMethodParser", () => {
+        it("accepts valid auth methods", () => {
+            assert.equal(authMethodParser.parse("cookie"), "cookie");
+            assert.equal(authMethodParser.parse("bearer"), "bearer");
+        });
+
+        it("rejects invalid auth methods", () => {
+            assert.throws(() => authMethodParser.parse("basic"));
+        });
+    });
+
+    describe("sessionDataParser", () => {
+        it("accepts valid session data", () => {
+            const data = {
+                tokenId: "abc123",
+                userId: "user-1",
+                tokenType: "session",
+                authMethod: "cookie",
+                createdAt: new Date(),
+                expiresAt: new Date(),
+            };
+            const result = sessionDataParser.parse(data);
+            assert.equal(result.tokenId, "abc123");
+            assert.equal(result.userId, "user-1");
+        });
+
+        it("coerces date strings to dates", () => {
+            const data = {
+                tokenId: "abc123",
+                userId: "user-1",
+                tokenType: "session",
+                authMethod: "cookie",
+                createdAt: "2025-01-01T00:00:00Z",
+                expiresAt: "2025-01-02T00:00:00Z",
+            };
+            const result = sessionDataParser.parse(data);
+            assert.ok(result.createdAt instanceof Date);
+            assert.ok(result.expiresAt instanceof Date);
+        });
+
+        it("accepts optional fields", () => {
+            const data = {
+                tokenId: "abc123",
+                userId: "user-1",
+                tokenType: "session",
+                authMethod: "cookie",
+                createdAt: new Date(),
+                expiresAt: new Date(),
+                lastUsedAt: new Date(),
+                userAgent: "Mozilla/5.0",
+                ipAddress: "127.0.0.1",
+                isUsed: true,
+            };
+            const result = sessionDataParser.parse(data);
+            assert.equal(result.userAgent, "Mozilla/5.0");
+            assert.equal(result.ipAddress, "127.0.0.1");
+            assert.equal(result.isUsed, true);
+        });
+    });
+
+    describe("loginInputParser", () => {
+        it("accepts valid login input", () => {
+            const result = loginInputParser.parse({
+                email: "test@example.com",
+                password: "secret",
+            });
+            assert.equal(result.email, "test@example.com");
+            assert.equal(result.password, "secret");
+        });
+
+        it("rejects invalid email", () => {
+            assert.throws(() =>
+                loginInputParser.parse({
+                    email: "not-an-email",
+                    password: "secret",
+                }),
+            );
+        });
+
+        it("rejects empty password", () => {
+            assert.throws(() =>
+                loginInputParser.parse({
+                    email: "test@example.com",
+                    password: "",
+                }),
+            );
+        });
+    });
+
+    describe("registerInputParser", () => {
+        it("accepts valid registration input", () => {
+            const result = registerInputParser.parse({
+                email: "test@example.com",
+                password: "password123",
+                displayName: "Test User",
+            });
+            assert.equal(result.email, "test@example.com");
+            assert.equal(result.password, "password123");
+            assert.equal(result.displayName, "Test User");
+        });
+
+        it("accepts registration without displayName", () => {
+            const result = registerInputParser.parse({
+                email: "test@example.com",
+                password: "password123",
+            });
+            assert.equal(result.displayName, undefined);
+        });
+
+        it("rejects password shorter than 8 characters", () => {
+            assert.throws(() =>
+                registerInputParser.parse({
+                    email: "test@example.com",
+                    password: "short",
+                }),
+            );
+        });
+    });
+
+    describe("forgotPasswordInputParser", () => {
+        it("accepts valid email", () => {
+            const result = forgotPasswordInputParser.parse({
+                email: "test@example.com",
+            });
+            assert.equal(result.email, "test@example.com");
+        });
+
+        it("rejects invalid email", () => {
+            assert.throws(() =>
+                forgotPasswordInputParser.parse({
+                    email: "invalid",
+                }),
+            );
+        });
+    });
+
+    describe("resetPasswordInputParser", () => {
+        it("accepts valid reset input", () => {
+            const result = resetPasswordInputParser.parse({
+                token: "abc123",
+                password: "newpassword",
+            });
+            assert.equal(result.token, "abc123");
+            assert.equal(result.password, "newpassword");
+        });
+
+        it("rejects empty token", () => {
+            assert.throws(() =>
+                resetPasswordInputParser.parse({
+                    token: "",
+                    password: "newpassword",
+                }),
+            );
+        });
+
+        it("rejects password shorter than 8 characters", () => {
+            assert.throws(() =>
+                resetPasswordInputParser.parse({
+                    token: "abc123",
+                    password: "short",
+                }),
+            );
+        });
+    });
+
+    describe("tokenLifetimes", () => {
+        it("defines session lifetime", () => {
+            assert.ok(tokenLifetimes.session > 0);
+            // 30 days in ms
+            assert.equal(tokenLifetimes.session, 30 * 24 * 60 * 60 * 1000);
+        });
+
+        it("defines password_reset lifetime", () => {
+            assert.ok(tokenLifetimes.password_reset > 0);
+            // 1 hour in ms
+            assert.equal(tokenLifetimes.password_reset, 1 * 60 * 60 * 1000);
+        });
+
+        it("defines email_verify lifetime", () => {
+            assert.ok(tokenLifetimes.email_verify > 0);
+            // 24 hours in ms
+            assert.equal(tokenLifetimes.email_verify, 24 * 60 * 60 * 1000);
+        });
+    });
+
+    describe("Session", () => {
+        it("wraps authenticated session", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                id: "user-1",
+            });
+            const sessionData = {
+                tokenId: "token-1",
+                userId: "user-1",
+                tokenType: "session" as const,
+                authMethod: "cookie" as const,
+                createdAt: new Date(),
+                expiresAt: new Date(),
+            };
+            const session = new Session(sessionData, user);
+
+            assert.equal(session.isAuthenticated(), true);
+            assert.equal(session.getUser(), user);
+            assert.equal(session.getData(), sessionData);
+            assert.equal(session.tokenId, "token-1");
+            assert.equal(session.userId, "user-1");
+        });
+
+        it("wraps anonymous session", () => {
+            const session = new Session(null, anonymousUser);
+
+            assert.equal(session.isAuthenticated(), false);
+            assert.equal(session.getUser(), anonymousUser);
+            assert.equal(session.getData(), null);
+            assert.equal(session.tokenId, undefined);
+            assert.equal(session.userId, undefined);
+        });
+    });
+});

backend/diachron/auth/types.ts

@@ -62,3 +62,35 @@ export const tokenLifetimes: Record<TokenType, number> = {
     password_reset: 1 * 60 * 60 * 1000, // 1 hour
     email_verify: 24 * 60 * 60 * 1000, // 24 hours
 };
+
+// Import here to avoid circular dependency at module load time
+import type { User } from "../user";
+
+// Session wrapper class providing a consistent interface for handlers.
+// Always present on Call (never null), but may represent an anonymous session.
+export class Session {
+    constructor(
+        private readonly data: SessionData | null,
+        private readonly user: User,
+    ) {}
+
+    getUser(): User {
+        return this.user;
+    }
+
+    getData(): SessionData | null {
+        return this.data;
+    }
+
+    isAuthenticated(): boolean {
+        return !this.user.isAnonymous();
+    }
+
+    get tokenId(): string | undefined {
+        return this.data?.tokenId;
+    }
+
+    get userId(): string | undefined {
+        return this.data?.userId;
+    }
+}

backend/diachron/basic/login.spec.ts

@@ -0,0 +1,24 @@
+// Tests for basic/login.ts
+// These tests verify the route structure and export
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { loginRoute } from "./login";
+
+describe("basic/login", () => {
+    describe("loginRoute", () => {
+        it("has correct path", () => {
+            assert.equal(loginRoute.path, "/login");
+        });
+
+        it("handles GET and POST methods", () => {
+            assert.ok(loginRoute.methods.includes("GET"));
+            assert.ok(loginRoute.methods.includes("POST"));
+            assert.equal(loginRoute.methods.length, 2);
+        });
+
+        it("has a handler function", () => {
+            assert.equal(typeof loginRoute.handler, "function");
+        });
+    });
+});

backend/diachron/basic/login.ts

@@ -0,0 +1,62 @@
+import { SESSION_COOKIE_NAME } from "../auth/token";
+import { tokenLifetimes } from "../auth/types";
+import { request } from "../request";
+import { html, redirect, render } from "../request/util";
+import type { Call, Result, Route } from "../types";
+
+const loginHandler = async (call: Call): Promise<Result> => {
+    if (call.method === "GET") {
+        const c = await render("basic/login", {});
+        return html(c);
+    }
+
+    // POST - handle login
+    const { email, password } = call.request.body;
+
+    if (!email || !password) {
+        const c = await render("basic/login", {
+            error: "Email and password are required",
+            email,
+        });
+        return html(c);
+    }
+
+    const result = await request.auth.login(email, password, "cookie", {
+        userAgent: call.request.get("User-Agent"),
+        ipAddress: call.request.ip,
+    });
+
+    if (!result.success) {
+        const c = await render("basic/login", {
+            error: result.error,
+            email,
+        });
+        return html(c);
+    }
+
+    // Success - set cookie and redirect to home
+    const redirectResult = redirect("/");
+    redirectResult.cookies = [
+        {
+            name: SESSION_COOKIE_NAME,
+            value: result.token,
+            options: {
+                httpOnly: true,
+                secure: false, // Set to true in production with HTTPS
+                sameSite: "lax",
+                maxAge: tokenLifetimes.session,
+                path: "/",
+            },
+        },
+    ];
+
+    return redirectResult;
+};
+
+const loginRoute: Route = {
+    path: "/login",
+    methods: ["GET", "POST"],
+    handler: loginHandler,
+};
+
+export { loginRoute };

backend/diachron/basic/logout.spec.ts

@@ -0,0 +1,24 @@
+// Tests for basic/logout.ts
+// These tests verify the route structure and export
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { logoutRoute } from "./logout";
+
+describe("basic/logout", () => {
+    describe("logoutRoute", () => {
+        it("has correct path", () => {
+            assert.equal(logoutRoute.path, "/logout");
+        });
+
+        it("handles GET and POST methods", () => {
+            assert.ok(logoutRoute.methods.includes("GET"));
+            assert.ok(logoutRoute.methods.includes("POST"));
+            assert.equal(logoutRoute.methods.length, 2);
+        });
+
+        it("has a handler function", () => {
+            assert.equal(typeof logoutRoute.handler, "function");
+        });
+    });
+});

backend/diachron/basic/logout.ts

@@ -0,0 +1,38 @@
+import { SESSION_COOKIE_NAME } from "../auth/token";
+import { request } from "../request";
+import { redirect } from "../request/util";
+import type { Call, Result, Route } from "../types";
+
+const logoutHandler = async (call: Call): Promise<Result> => {
+    // Extract token from cookie and invalidate the session
+    const token = request.auth.extractToken(call.request);
+    if (token) {
+        await request.auth.logout(token);
+    }
+
+    // Clear the cookie and redirect to login
+    const redirectResult = redirect("/login");
+    redirectResult.cookies = [
+        {
+            name: SESSION_COOKIE_NAME,
+            value: "",
+            options: {
+                httpOnly: true,
+                secure: false,
+                sameSite: "lax",
+                maxAge: 0,
+                path: "/",
+            },
+        },
+    ];
+
+    return redirectResult;
+};
+
+const logoutRoute: Route = {
+    path: "/logout",
+    methods: ["GET", "POST"],
+    handler: logoutHandler,
+};
+
+export { logoutRoute };

backend/diachron/basic/routes.spec.ts

@@ -0,0 +1,73 @@
+// Tests for basic/routes.ts
+// These tests verify the route structure and exports
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { routes } from "./routes";
+
+describe("basic/routes", () => {
+    describe("routes object", () => {
+        it("exports routes as an object", () => {
+            assert.equal(typeof routes, "object");
+        });
+
+        it("contains hello route", () => {
+            assert.ok("hello" in routes);
+            assert.equal(routes.hello.path, "/hello");
+            assert.ok(routes.hello.methods.includes("GET"));
+        });
+
+        it("contains home route", () => {
+            assert.ok("home" in routes);
+            assert.equal(routes.home.path, "/");
+            assert.ok(routes.home.methods.includes("GET"));
+        });
+
+        it("contains login route", () => {
+            assert.ok("login" in routes);
+            assert.equal(routes.login.path, "/login");
+        });
+
+        it("contains logout route", () => {
+            assert.ok("logout" in routes);
+            assert.equal(routes.logout.path, "/logout");
+        });
+
+        it("all routes have handlers", () => {
+            for (const [name, route] of Object.entries(routes)) {
+                assert.equal(
+                    typeof route.handler,
+                    "function",
+                    `Route ${name} should have a handler function`,
+                );
+            }
+        });
+
+        it("all routes have methods array", () => {
+            for (const [name, route] of Object.entries(routes)) {
+                assert.ok(
+                    Array.isArray(route.methods),
+                    `Route ${name} should have methods array`,
+                );
+                assert.ok(
+                    route.methods.length > 0,
+                    `Route ${name} should have at least one method`,
+                );
+            }
+        });
+
+        it("all routes have path string", () => {
+            for (const [name, route] of Object.entries(routes)) {
+                assert.equal(
+                    typeof route.path,
+                    "string",
+                    `Route ${name} should have a path string`,
+                );
+                assert.ok(
+                    route.path.startsWith("/"),
+                    `Route ${name} path should start with /`,
+                );
+            }
+        });
+    });
+});

backend/diachron/basic/routes.ts

@@ -0,0 +1,58 @@
+import { DateTime } from "ts-luxon";
+import { get, User } from "../hydrators/user";
+import { request } from "../request";
+import { html, render } from "../request/util";
+import type { Call, Result, Route } from "../types";
+import { loginRoute } from "./login";
+import { logoutRoute } from "./logout";
+
+const routes: Record<string, Route> = {
+    hello: {
+        path: "/hello",
+        methods: ["GET"],
+        handler: async (call: Call): Promise<Result> => {
+            const now = DateTime.now();
+            const args: {now: DateTime,greeting?: string} = {now};
+
+            if (call.path !== '/hello') {
+                const greeting = call. path.replaceAll('/','').replaceAll('-', ' ')
+                args.greeting = greeting;
+            }
+
+            const c = await render("basic/hello", args);
+
+            return html(c);
+        },
+    },
+    home: {
+        path: "/",
+        methods: ["GET"],
+        handler: async (_call: Call): Promise<Result> => {
+            const _auth = request.auth;
+            const me = request.session.getUser();
+
+            const id = me.id;
+            console.log(`*** id: ${id}`);
+
+            const u = await get(id);
+
+            const email = u?.email || "anonymous@example.com";
+            const name = u?.display_name || "anonymous";
+            const showLogin = me.isAnonymous();
+            const showLogout = !me.isAnonymous();
+
+            const c = await render("basic/home", {
+                name,
+                email,
+                showLogin,
+                showLogout,
+            });
+
+            return html(c);
+        },
+    },
+    login: loginRoute,
+    logout: logoutRoute,
+};
+
+export { routes };

backend/diachron/cli.ts

@@ -30,7 +30,7 @@ function parseListenAddress(listen: string | undefined): {
     if (lastColon === -1) {
         // Just a port number
         const port = parseInt(listen, 10);
-        if (isNaN(port)) {
+        if (Number.isNaN(port)) {
             throw new Error(`Invalid listen address: ${listen}`);
         }
         return { host: defaultHost, port };
@@ -39,7 +39,7 @@ function parseListenAddress(listen: string | undefined): {
     const host = listen.slice(0, lastColon);
     const port = parseInt(listen.slice(lastColon + 1), 10);
 
-    if (isNaN(port)) {
+    if (Number.isNaN(port)) {
         throw new Error(`Invalid port in listen address: ${listen}`);
     }
 

backend/diachron/content-types.ts

@@ -1,4 +1,4 @@
-import { Extensible } from "./interfaces";
+// This file belongs to the framework.  You are not expected to modify it.
 
 export type ContentType = string;
 

backend/diachron/context.ts

@@ -0,0 +1,27 @@
+// context.ts
+//
+// Request-scoped context using AsyncLocalStorage.
+// Allows services to access request data (like the current user) without
+// needing to pass Call through every function.
+
+import { AsyncLocalStorage } from "node:async_hooks";
+import { anonymousUser, type User } from "./user";
+
+type RequestContext = {
+    user: User;
+};
+
+const asyncLocalStorage = new AsyncLocalStorage<RequestContext>();
+
+// Run a function within a request context
+function runWithContext<T>(context: RequestContext, fn: () => T): T {
+    return asyncLocalStorage.run(context, fn);
+}
+
+// Get the current user from context, or AnonymousUser if not in a request
+function getCurrentUser(): User {
+    const context = asyncLocalStorage.getStore();
+    return context?.user ?? anonymousUser;
+}
+
+export { getCurrentUser, runWithContext, type RequestContext };

backend/diachron/core/index.ts

@@ -0,0 +1,50 @@
+import nunjucks from "nunjucks";
+import { db, migrate, migrationStatus } from "../database";
+import { formatError, formatErrorHtml } from "../errors";
+import { getLogs, log } from "../logging";
+
+// FIXME: This doesn't belong here; move it somewhere else.
+const conf = {
+    templateEngine: () => {
+        return {
+            renderTemplate: (template: string, context: object) => {
+                return nunjucks.renderString(template, context);
+            },
+        };
+    },
+};
+
+const database = {
+    db,
+    migrate,
+    migrationStatus,
+};
+
+const logging = {
+    log,
+    getLogs,
+};
+
+const random = {
+    randomNumber: () => {
+        return Math.random();
+    },
+};
+
+const misc = {
+    sleep: (ms: number) => {
+        return new Promise((resolve) => setTimeout(resolve, ms));
+    },
+};
+
+// Keep this asciibetically sorted
+const core = {
+    conf,
+    database,
+    errors: { formatError, formatErrorHtml },
+    logging,
+    misc,
+    random,
+};
+
+export { core };

backend/diachron/database.spec.ts

@@ -0,0 +1,285 @@
+// Tests for database.ts
+// Requires test PostgreSQL: docker compose -f docker-compose.test.yml up -d
+
+import assert from "node:assert/strict";
+import { after, before, beforeEach, describe, it } from "node:test";
+import {
+    connectionConfig,
+    db,
+    migrate,
+    migrationStatus,
+    PostgresAuthStore,
+    pool,
+    raw,
+    rawPool,
+} from "./database";
+import type { UserId } from "./user";
+
+describe("database", () => {
+    before(async () => {
+        // Run migrations to set up schema
+        await migrate();
+    });
+
+    after(async () => {
+        await pool.end();
+    });
+
+    describe("connectionConfig", () => {
+        it("has required fields", () => {
+            assert.ok("host" in connectionConfig);
+            assert.ok("port" in connectionConfig);
+            assert.ok("user" in connectionConfig);
+            assert.ok("password" in connectionConfig);
+            assert.ok("database" in connectionConfig);
+        });
+
+        it("port is a number", () => {
+            assert.equal(typeof connectionConfig.port, "number");
+        });
+    });
+
+    describe("raw", () => {
+        it("executes raw SQL queries", async () => {
+            const result = await raw<{ one: number }>("SELECT 1 as one");
+            assert.equal(result.length, 1);
+            assert.equal(result[0].one, 1);
+        });
+
+        it("supports parameterized queries", async () => {
+            const result = await raw<{ sum: number }>(
+                "SELECT $1::int + $2::int as sum",
+                [2, 3],
+            );
+            assert.equal(result[0].sum, 5);
+        });
+    });
+
+    describe("db (Kysely instance)", () => {
+        it("can execute SELECT queries", async () => {
+            const result = await db
+                .selectFrom("users")
+                .select("id")
+                .limit(1)
+                .execute();
+
+            // May be empty, just verify it runs
+            assert.ok(Array.isArray(result));
+        });
+    });
+
+    describe("rawPool", () => {
+        it("is a pg Pool instance", () => {
+            assert.ok(rawPool.query !== undefined);
+        });
+
+        it("can execute queries", async () => {
+            const result = await rawPool.query("SELECT 1 as one");
+            assert.equal(result.rows[0].one, 1);
+        });
+    });
+
+    describe("migrate", () => {
+        it("runs without error when migrations are up to date", async () => {
+            // Should not throw
+            await migrate();
+        });
+    });
+
+    describe("migrationStatus", () => {
+        it("returns applied and pending arrays", async () => {
+            const status = await migrationStatus();
+
+            assert.ok(Array.isArray(status.applied));
+            assert.ok(Array.isArray(status.pending));
+        });
+
+        it("shows framework migrations as applied", async () => {
+            const status = await migrationStatus();
+
+            // At least the users migration should be applied
+            const hasUsersMigration = status.applied.some((m) =>
+                m.includes("users"),
+            );
+            assert.ok(hasUsersMigration);
+        });
+    });
+
+    describe("PostgresAuthStore", () => {
+        let store: PostgresAuthStore;
+
+        before(() => {
+            store = new PostgresAuthStore();
+        });
+
+        beforeEach(async () => {
+            // Clean up test data before each test
+            await rawPool.query("DELETE FROM sessions");
+            await rawPool.query("DELETE FROM user_credentials");
+            await rawPool.query("DELETE FROM user_emails");
+            await rawPool.query("DELETE FROM users");
+        });
+
+        describe("createUser", () => {
+            it("creates a user with pending status", async () => {
+                const user = await store.createUser({
+                    email: "test@example.com",
+                    passwordHash: "hash123",
+                    displayName: "Test User",
+                });
+
+                assert.equal(user.email, "test@example.com");
+                assert.equal(user.displayName, "Test User");
+                assert.equal(user.status, "pending");
+            });
+
+            it("stores the password hash", async () => {
+                const user = await store.createUser({
+                    email: "test@example.com",
+                    passwordHash: "secrethash",
+                });
+
+                const hash = await store.getUserPasswordHash(user.id);
+                assert.equal(hash, "secrethash");
+            });
+        });
+
+        describe("getUserByEmail", () => {
+            it("returns user when found", async () => {
+                await store.createUser({
+                    email: "find@example.com",
+                    passwordHash: "hash",
+                });
+
+                const user = await store.getUserByEmail("find@example.com");
+                assert.notEqual(user, null);
+                assert.equal(user!.email, "find@example.com");
+            });
+
+            it("is case-insensitive", async () => {
+                await store.createUser({
+                    email: "UPPER@EXAMPLE.COM",
+                    passwordHash: "hash",
+                });
+
+                const user = await store.getUserByEmail("upper@example.com");
+                assert.notEqual(user, null);
+            });
+
+            it("returns null when not found", async () => {
+                const user = await store.getUserByEmail("notfound@example.com");
+                assert.equal(user, null);
+            });
+        });
+
+        describe("getUserById", () => {
+            it("returns user when found", async () => {
+                const created = await store.createUser({
+                    email: "test@example.com",
+                    passwordHash: "hash",
+                });
+
+                const user = await store.getUserById(created.id);
+                assert.notEqual(user, null);
+                assert.equal(user!.id, created.id);
+            });
+
+            it("returns null when not found", async () => {
+                const user = await store.getUserById(
+                    "00000000-0000-0000-0000-000000000000" as UserId,
+                );
+                assert.equal(user, null);
+            });
+        });
+
+        describe("setUserPassword", () => {
+            it("updates the password hash", async () => {
+                const user = await store.createUser({
+                    email: "test@example.com",
+                    passwordHash: "oldhash",
+                });
+
+                await store.setUserPassword(user.id, "newhash");
+
+                const hash = await store.getUserPasswordHash(user.id);
+                assert.equal(hash, "newhash");
+            });
+        });
+
+        describe("updateUserEmailVerified", () => {
+            it("sets user status to active", async () => {
+                const created = await store.createUser({
+                    email: "test@example.com",
+                    passwordHash: "hash",
+                });
+                assert.equal(created.status, "pending");
+
+                await store.updateUserEmailVerified(created.id);
+
+                const user = await store.getUserById(created.id);
+                assert.equal(user!.status, "active");
+            });
+        });
+
+        describe("session operations", () => {
+            let userId: UserId;
+
+            beforeEach(async () => {
+                const user = await store.createUser({
+                    email: "session@example.com",
+                    passwordHash: "hash",
+                });
+                userId = user.id;
+            });
+
+            it("creates and retrieves sessions", async () => {
+                const { token, session } = await store.createSession({
+                    userId,
+                    tokenType: "session",
+                    authMethod: "cookie",
+                    expiresAt: new Date(Date.now() + 3600000),
+                });
+
+                assert.ok(token.length > 0);
+                assert.equal(session.userId, userId);
+                assert.equal(session.tokenType, "session");
+            });
+
+            it("deletes sessions", async () => {
+                const { session } = await store.createSession({
+                    userId,
+                    tokenType: "session",
+                    authMethod: "cookie",
+                    expiresAt: new Date(Date.now() + 3600000),
+                });
+
+                await store.deleteSession(session.tokenId as any);
+
+                // Session should be soft-deleted (revoked)
+                const retrieved = await store.getSession(
+                    session.tokenId as any,
+                );
+                assert.equal(retrieved, null);
+            });
+
+            it("deletes all user sessions", async () => {
+                await store.createSession({
+                    userId,
+                    tokenType: "session",
+                    authMethod: "cookie",
+                    expiresAt: new Date(Date.now() + 3600000),
+                });
+
+                await store.createSession({
+                    userId,
+                    tokenType: "session",
+                    authMethod: "bearer",
+                    expiresAt: new Date(Date.now() + 3600000),
+                });
+
+                const count = await store.deleteUserSessions(userId);
+                assert.equal(count, 2);
+            });
+        });
+    });
+});

backend/diachron/database.ts

@@ -0,0 +1,548 @@
+// database.ts
+// PostgreSQL database access with Kysely query builder and simple migrations
+
+import * as fs from "node:fs";
+import * as path from "node:path";
+import {
+    type Generated,
+    Kysely,
+    PostgresDialect,
+    type Selectable,
+    sql,
+} from "kysely";
+import { Pool } from "pg";
+import type {
+    AuthStore,
+    CreateSessionData,
+    CreateUserData,
+} from "./auth/store";
+import { generateToken, hashToken } from "./auth/token";
+import type { SessionData, TokenId } from "./auth/types";
+import type { Domain } from "./types";
+import { AuthenticatedUser, type User, type UserId } from "./user";
+
+// Connection configuration (supports environment variable overrides)
+const connectionConfig = {
+    host: process.env.DB_HOST ?? "localhost",
+    port: Number(process.env.DB_PORT ?? 5432),
+    user: process.env.DB_USER ?? "diachron",
+    password: process.env.DB_PASSWORD ?? "diachron",
+    database: process.env.DB_NAME ?? "diachron",
+};
+
+// Database schema types for Kysely
+// Generated<T> marks columns with database defaults (optional on insert)
+interface UsersTable {
+    id: string;
+    status: Generated<string>;
+    display_name: string | null;
+    created_at: Generated<Date>;
+    updated_at: Generated<Date>;
+}
+
+interface UserEmailsTable {
+    id: string;
+    user_id: string;
+    email: string;
+    normalized_email: string;
+    is_primary: Generated<boolean>;
+    is_verified: Generated<boolean>;
+    created_at: Generated<Date>;
+    verified_at: Date | null;
+    revoked_at: Date | null;
+}
+
+interface UserCredentialsTable {
+    id: string;
+    user_id: string;
+    credential_type: Generated<string>;
+    password_hash: string | null;
+    created_at: Generated<Date>;
+    updated_at: Generated<Date>;
+}
+
+interface SessionsTable {
+    id: Generated<string>;
+    token_hash: string;
+    user_id: string;
+    user_email_id: string | null;
+    token_type: string;
+    auth_method: string;
+    created_at: Generated<Date>;
+    expires_at: Date;
+    revoked_at: Date | null;
+    ip_address: string | null;
+    user_agent: string | null;
+    is_used: Generated<boolean | null>;
+}
+
+interface Database {
+    users: UsersTable;
+    user_emails: UserEmailsTable;
+    user_credentials: UserCredentialsTable;
+    sessions: SessionsTable;
+}
+
+// Create the connection pool
+const pool = new Pool(connectionConfig);
+
+// Create the Kysely instance
+const db = new Kysely<Database>({
+    dialect: new PostgresDialect({ pool }),
+});
+
+// Raw pool access for when you need it
+const rawPool = pool;
+
+// Execute raw SQL (for when Kysely doesn't fit)
+async function raw<T = unknown>(
+    query: string,
+    params: unknown[] = [],
+): Promise<T[]> {
+    const result = await pool.query(query, params);
+    return result.rows as T[];
+}
+
+// ============================================================================
+// Migrations
+// ============================================================================
+
+// Migration file naming convention:
+//   yyyy-mm-dd_ss_description.sql
+//   e.g., 2025-01-15_01_initial.sql, 2025-01-15_02_add_users.sql
+//
+// Migrations directory: express/migrations/
+
+const FRAMEWORK_MIGRATIONS_DIR = path.join(__dirname, "diachron/migrations");
+const APP_MIGRATIONS_DIR = path.join(__dirname, "migrations");
+const MIGRATIONS_TABLE = "_migrations";
+
+interface MigrationRecord {
+    id: number;
+    name: string;
+    applied_at: Date;
+}
+
+// Ensure migrations table exists
+async function ensureMigrationsTable(): Promise<void> {
+    await pool.query(`
+        CREATE TABLE IF NOT EXISTS ${MIGRATIONS_TABLE} (
+            id SERIAL PRIMARY KEY,
+            name TEXT NOT NULL UNIQUE,
+            applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+        )
+    `);
+}
+
+// Get list of applied migrations
+async function getAppliedMigrations(): Promise<string[]> {
+    const result = await pool.query<MigrationRecord>(
+        `SELECT name FROM ${MIGRATIONS_TABLE} ORDER BY name`,
+    );
+    return result.rows.map((r) => r.name);
+}
+
+// Get pending migration files
+function getMigrationFiles(kind: Domain): string[] {
+    const dir = kind === "fw" ? FRAMEWORK_MIGRATIONS_DIR : APP_MIGRATIONS_DIR;
+
+    if (!fs.existsSync(dir)) {
+        return [];
+    }
+
+    const root = __dirname;
+
+    const mm = fs
+        .readdirSync(dir)
+        .filter((f) => f.endsWith(".sql"))
+        .filter((f) => /^\d{4}-\d{2}-\d{2}_\d{2}-/.test(f))
+        .map((f) => `${dir}/${f}`)
+        .map((f) => f.replace(`${root}/`, ""))
+        .sort();
+
+    return mm;
+}
+
+// Run a single migration
+async function runMigration(filename: string): Promise<void> {
+    // const filepath = path.join(MIGRATIONS_DIR, filename);
+    const filepath = filename;
+    const content = fs.readFileSync(filepath, "utf-8");
+
+    process.stdout.write(`  Migration: ${filename}...`);
+
+    // Run migration in a transaction
+    const client = await pool.connect();
+    try {
+        await client.query("BEGIN");
+        await client.query(content);
+        await client.query(
+            `INSERT INTO ${MIGRATIONS_TABLE} (name) VALUES ($1)`,
+            [filename],
+        );
+        await client.query("COMMIT");
+        console.log(" ✓");
+    } catch (err) {
+        console.log(" ✗");
+        const message = err instanceof Error ? err.message : String(err);
+        console.error(`    Error: ${message}`);
+        await client.query("ROLLBACK");
+        throw err;
+    } finally {
+        client.release();
+    }
+}
+
+function getAllMigrationFiles() {
+    const fw_files = getMigrationFiles("fw");
+    const app_files = getMigrationFiles("app");
+    const all = [...fw_files, ...app_files];
+
+    return all;
+}
+
+// Run all pending migrations
+async function migrate(): Promise<void> {
+    await ensureMigrationsTable();
+
+    const applied = new Set(await getAppliedMigrations());
+    const all = getAllMigrationFiles();
+    const pending = all.filter((all) => !applied.has(all));
+
+    if (pending.length === 0) {
+        console.log("No pending migrations");
+        return;
+    }
+
+    console.log(`Applying ${pending.length} migration(s):`);
+    for (const file of pending) {
+        await runMigration(file);
+    }
+}
+
+// List migration status
+async function migrationStatus(): Promise<{
+    applied: string[];
+    pending: string[];
+}> {
+    await ensureMigrationsTable();
+    const applied = new Set(await getAppliedMigrations());
+    const ff = getAllMigrationFiles();
+    return {
+        applied: ff.filter((ff) => applied.has(ff)),
+        pending: ff.filter((ff) => !applied.has(ff)),
+    };
+}
+
+// ============================================================================
+// PostgresAuthStore - Database-backed authentication storage
+// ============================================================================
+
+class PostgresAuthStore implements AuthStore {
+    // Session operations
+
+    async createSession(
+        data: CreateSessionData,
+    ): Promise<{ token: string; session: SessionData }> {
+        const token = generateToken();
+        const tokenHash = hashToken(token);
+
+        const row = await db
+            .insertInto("sessions")
+            .values({
+                token_hash: tokenHash,
+                user_id: data.userId,
+                token_type: data.tokenType,
+                auth_method: data.authMethod,
+                expires_at: data.expiresAt,
+                user_agent: data.userAgent ?? null,
+                ip_address: data.ipAddress ?? null,
+            })
+            .returningAll()
+            .executeTakeFirstOrThrow();
+
+        const session: SessionData = {
+            tokenId: row.token_hash,
+            userId: row.user_id,
+            tokenType: row.token_type as SessionData["tokenType"],
+            authMethod: row.auth_method as SessionData["authMethod"],
+            createdAt: row.created_at,
+            expiresAt: row.expires_at,
+            userAgent: row.user_agent ?? undefined,
+            ipAddress: row.ip_address ?? undefined,
+            isUsed: row.is_used ?? undefined,
+        };
+
+        return { token, session };
+    }
+
+    async getSession(tokenId: TokenId): Promise<SessionData | null> {
+        const row = await db
+            .selectFrom("sessions")
+            .selectAll()
+            .where("token_hash", "=", tokenId)
+            .where("expires_at", ">", new Date())
+            .where("revoked_at", "is", null)
+            .executeTakeFirst();
+
+        if (!row) {
+            return null;
+        }
+
+        return {
+            tokenId: row.token_hash,
+            userId: row.user_id,
+            tokenType: row.token_type as SessionData["tokenType"],
+            authMethod: row.auth_method as SessionData["authMethod"],
+            createdAt: row.created_at,
+            expiresAt: row.expires_at,
+            userAgent: row.user_agent ?? undefined,
+            ipAddress: row.ip_address ?? undefined,
+            isUsed: row.is_used ?? undefined,
+        };
+    }
+
+    async updateLastUsed(_tokenId: TokenId): Promise<void> {
+        // The new schema doesn't have last_used_at column
+        // This is now a no-op; session activity tracking could be added later
+    }
+
+    async deleteSession(tokenId: TokenId): Promise<void> {
+        // Soft delete by setting revoked_at
+        await db
+            .updateTable("sessions")
+            .set({ revoked_at: new Date() })
+            .where("token_hash", "=", tokenId)
+            .execute();
+    }
+
+    async deleteUserSessions(userId: UserId): Promise<number> {
+        const result = await db
+            .updateTable("sessions")
+            .set({ revoked_at: new Date() })
+            .where("user_id", "=", userId)
+            .where("revoked_at", "is", null)
+            .executeTakeFirst();
+
+        return Number(result.numUpdatedRows);
+    }
+
+    // User operations
+
+    async getUserByEmail(email: string): Promise<User | null> {
+        // Find user through user_emails table
+        const normalizedEmail = email.toLowerCase().trim();
+
+        const row = await db
+            .selectFrom("user_emails")
+            .innerJoin("users", "users.id", "user_emails.user_id")
+            .select([
+                "users.id",
+                "users.status",
+                "users.display_name",
+                "users.created_at",
+                "users.updated_at",
+                "user_emails.email",
+            ])
+            .where("user_emails.normalized_email", "=", normalizedEmail)
+            .where("user_emails.revoked_at", "is", null)
+            .executeTakeFirst();
+
+        if (!row) {
+            return null;
+        }
+        return this.rowToUser(row);
+    }
+
+    async getUserById(userId: UserId): Promise<User | null> {
+        // Get user with their primary email
+        const row = await db
+            .selectFrom("users")
+            .leftJoin("user_emails", (join) =>
+                join
+                    .onRef("user_emails.user_id", "=", "users.id")
+                    .on("user_emails.is_primary", "=", true)
+                    .on("user_emails.revoked_at", "is", null),
+            )
+            .select([
+                "users.id",
+                "users.status",
+                "users.display_name",
+                "users.created_at",
+                "users.updated_at",
+                "user_emails.email",
+            ])
+            .where("users.id", "=", userId)
+            .executeTakeFirst();
+
+        if (!row) {
+            return null;
+        }
+        return this.rowToUser(row);
+    }
+
+    async createUser(data: CreateUserData): Promise<User> {
+        const userId = crypto.randomUUID();
+        const emailId = crypto.randomUUID();
+        const credentialId = crypto.randomUUID();
+        const now = new Date();
+        const normalizedEmail = data.email.toLowerCase().trim();
+
+        // Create user record
+        await db
+            .insertInto("users")
+            .values({
+                id: userId,
+                display_name: data.displayName ?? null,
+                status: "pending",
+                created_at: now,
+                updated_at: now,
+            })
+            .execute();
+
+        // Create user_email record
+        await db
+            .insertInto("user_emails")
+            .values({
+                id: emailId,
+                user_id: userId,
+                email: data.email,
+                normalized_email: normalizedEmail,
+                is_primary: true,
+                is_verified: false,
+                created_at: now,
+            })
+            .execute();
+
+        // Create user_credential record
+        await db
+            .insertInto("user_credentials")
+            .values({
+                id: credentialId,
+                user_id: userId,
+                credential_type: "password",
+                password_hash: data.passwordHash,
+                created_at: now,
+                updated_at: now,
+            })
+            .execute();
+
+        return new AuthenticatedUser({
+            id: userId,
+            email: data.email,
+            displayName: data.displayName,
+            status: "pending",
+            roles: [],
+            permissions: [],
+            createdAt: now,
+            updatedAt: now,
+        });
+    }
+
+    async getUserPasswordHash(userId: UserId): Promise<string | null> {
+        const row = await db
+            .selectFrom("user_credentials")
+            .select("password_hash")
+            .where("user_id", "=", userId)
+            .where("credential_type", "=", "password")
+            .executeTakeFirst();
+
+        return row?.password_hash ?? null;
+    }
+
+    async setUserPassword(userId: UserId, passwordHash: string): Promise<void> {
+        const now = new Date();
+
+        // Try to update existing credential
+        const result = await db
+            .updateTable("user_credentials")
+            .set({ password_hash: passwordHash, updated_at: now })
+            .where("user_id", "=", userId)
+            .where("credential_type", "=", "password")
+            .executeTakeFirst();
+
+        // If no existing credential, create one
+        if (Number(result.numUpdatedRows) === 0) {
+            await db
+                .insertInto("user_credentials")
+                .values({
+                    id: crypto.randomUUID(),
+                    user_id: userId,
+                    credential_type: "password",
+                    password_hash: passwordHash,
+                    created_at: now,
+                    updated_at: now,
+                })
+                .execute();
+        }
+
+        // Update user's updated_at
+        await db
+            .updateTable("users")
+            .set({ updated_at: now })
+            .where("id", "=", userId)
+            .execute();
+    }
+
+    async updateUserEmailVerified(userId: UserId): Promise<void> {
+        const now = new Date();
+
+        // Update user_emails to mark as verified
+        await db
+            .updateTable("user_emails")
+            .set({
+                is_verified: true,
+                verified_at: now,
+            })
+            .where("user_id", "=", userId)
+            .where("is_primary", "=", true)
+            .execute();
+
+        // Update user status to active
+        await db
+            .updateTable("users")
+            .set({
+                status: "active",
+                updated_at: now,
+            })
+            .where("id", "=", userId)
+            .execute();
+    }
+
+    // Helper to convert database row to User object
+    private rowToUser(row: {
+        id: string;
+        status: string;
+        display_name: string | null;
+        created_at: Date;
+        updated_at: Date;
+        email: string | null;
+    }): User {
+        return new AuthenticatedUser({
+            id: row.id,
+            email: row.email ?? "unknown@example.com",
+            displayName: row.display_name ?? undefined,
+            status: row.status as "active" | "suspended" | "pending",
+            roles: [], // TODO: query from RBAC tables
+            permissions: [], // TODO: query from RBAC tables
+            createdAt: row.created_at,
+            updatedAt: row.updated_at,
+        });
+    }
+}
+
+// ============================================================================
+// Exports
+// ============================================================================
+
+export {
+    db,
+    raw,
+    rawPool,
+    pool,
+    migrate,
+    migrationStatus,
+    connectionConfig,
+    PostgresAuthStore,
+    type Database,
+};

backend/diachron/develop/clear-db.ts

@@ -0,0 +1,17 @@
+import { connectionConfig, migrate, pool } from "../database";
+import { dropTables, exitIfUnforced } from "./util";
+
+async function main(): Promise<void> {
+    exitIfUnforced();
+
+    try {
+        await dropTables();
+    } finally {
+        await pool.end();
+    }
+}
+
+main().catch((err) => {
+    console.error("Failed to clear database:", err.message);
+    process.exit(1);
+});

backend/diachron/develop/reset-db.ts

@@ -0,0 +1,26 @@
+// reset-db.ts
+// Development command to wipe the database and apply all migrations from scratch
+
+import { connectionConfig, migrate, pool } from "../database";
+import { dropTables, exitIfUnforced } from "./util";
+
+async function main(): Promise<void> {
+    exitIfUnforced();
+
+    try {
+        await dropTables();
+
+        console.log("");
+        await migrate();
+
+        console.log("");
+        console.log("Database reset complete.");
+    } finally {
+        await pool.end();
+    }
+}
+
+main().catch((err) => {
+    console.error("Failed to reset database:", err.message);
+    process.exit(1);
+});

backend/diachron/develop/util.ts

@@ -0,0 +1,42 @@
+// FIXME: this is at the wrong level of specificity
+
+import { connectionConfig, migrate, pool } from "../database";
+
+const exitIfUnforced = () => {
+    const args = process.argv.slice(2);
+
+    // Require explicit confirmation unless --force is passed
+    if (!args.includes("--force")) {
+        console.error("This will DROP ALL TABLES in the database!");
+        console.error(`  Database: ${connectionConfig.database}`);
+        console.error(
+            `  Host: ${connectionConfig.host}:${connectionConfig.port}`,
+        );
+        console.error("");
+        console.error("Run with --force to proceed.");
+        process.exit(1);
+    }
+};
+
+const dropTables = async () => {
+    console.log("Dropping all tables...");
+
+    // Get all table names in the public schema
+    const result = await pool.query<{ tablename: string }>(`
+            SELECT tablename FROM pg_tables
+            WHERE schemaname = 'public'
+        `);
+
+    if (result.rows.length > 0) {
+        // Drop all tables with CASCADE to handle foreign key constraints
+        const tableNames = result.rows
+            .map((r) => `"${r.tablename}"`)
+            .join(", ");
+        await pool.query(`DROP TABLE IF EXISTS ${tableNames} CASCADE`);
+        console.log(`Dropped ${result.rows.length} table(s)`);
+    } else {
+        console.log("No tables to drop");
+    }
+};
+
+export { dropTables, exitIfUnforced };

backend/diachron/errors.ts

@@ -0,0 +1,229 @@
+// ANSI escape codes
+const bold = "\x1b[1m";
+const red = "\x1b[31m";
+const cyan = "\x1b[36m";
+const dim = "\x1b[2m";
+const reset = "\x1b[0m";
+
+interface ParsedFrame {
+    raw: string;
+    fn: string;
+    file: string;
+    line: string;
+    col: string;
+    isApp: boolean;
+}
+
+const frameRe = /^\s*at\s+(?:(.+?)\s+)?\(?((?:\/|[a-zA-Z]:\\).+?):(\d+):(\d+)\)?$/;
+
+function parseFrame(line: string): ParsedFrame | null {
+    const m = line.match(frameRe);
+    if (!m) return null;
+
+    const fn = m[1] ?? "<anonymous>";
+    const file = m[2];
+    const lineNum = m[3];
+    const col = m[4];
+
+    const isApp =
+        !file.includes("node_modules") && !file.startsWith("node:");
+
+    return { raw: line, fn, file, line: lineNum, col, isApp };
+}
+
+function relativePath(absPath: string): string {
+    const marker = "backend/";
+    const idx = absPath.lastIndexOf(marker);
+    if (idx !== -1) return absPath.slice(idx);
+    return absPath;
+}
+
+function libraryName(file: string): string {
+    const nmIdx = file.indexOf("node_modules/");
+    if (nmIdx === -1) return "node";
+    const after = file.slice(nmIdx + "node_modules/".length);
+    // Handle scoped packages like @scope/pkg
+    if (after.startsWith("@")) {
+        const parts = after.split("/");
+        return `${parts[0]}/${parts[1]}`;
+    }
+    return after.split("/")[0];
+}
+
+interface ParsedError {
+    message: string;
+    frames: ParsedFrame[];
+}
+
+function parseError(error: unknown): ParsedError {
+    if (!(error instanceof Error)) {
+        return { message: String(error), frames: [] };
+    }
+
+    const message = error.message ?? String(error);
+    const stack = error.stack ?? "";
+
+    const lines = stack.split("\n");
+    const frameLines: string[] = [];
+    for (const line of lines) {
+        if (line.trimStart().startsWith("at ")) {
+            frameLines.push(line);
+        }
+    }
+
+    const frames = frameLines
+        .map(parseFrame)
+        .filter((f): f is ParsedFrame => f !== null);
+
+    return { message, frames };
+}
+
+// Group consecutive library frames into collapsed runs
+type FrameGroup =
+    | { kind: "app"; frame: ParsedFrame }
+    | { kind: "lib"; count: number; names: string[] };
+
+function groupFrames(frames: ParsedFrame[]): FrameGroup[] {
+    const groups: FrameGroup[] = [];
+    let i = 0;
+    while (i < frames.length) {
+        if (frames[i].isApp) {
+            groups.push({ kind: "app", frame: frames[i] });
+            i++;
+        } else {
+            const libNames = new Set<string>();
+            let count = 0;
+            while (i < frames.length && !frames[i].isApp) {
+                libNames.add(libraryName(frames[i].file));
+                count++;
+                i++;
+            }
+            groups.push({ kind: "lib", count, names: [...libNames] });
+        }
+    }
+    return groups;
+}
+
+function libSummary(count: number, names: string[]): string {
+    const s = count === 1 ? "" : "s";
+    return `... ${count} internal frame${s} (${names.join(", ")})`;
+}
+
+// --- Console formatting (ANSI) ---
+
+function formatError(error: unknown): string {
+    const { message, frames } = parseError(error);
+    if (frames.length === 0) {
+        return `${bold}${red}ERROR${reset}  ${message}`;
+    }
+
+    const parts: string[] = [];
+    parts.push(`${bold}${red}ERROR${reset}  ${message}`);
+    parts.push("");
+
+    for (const group of groupFrames(frames)) {
+        if (group.kind === "app") {
+            const rel = relativePath(group.frame.file);
+            const loc = `${rel}:${group.frame.line}`;
+            parts.push(
+                `  ${bold}${cyan}${loc.padEnd(24)}${reset}at ${group.frame.fn}`,
+            );
+        } else {
+            parts.push(
+                `  ${dim}${libSummary(group.count, group.names)}${reset}`,
+            );
+        }
+    }
+
+    return parts.join("\n");
+}
+
+// --- HTML formatting (browser) ---
+
+function esc(s: string): string {
+    return s
+        .replace(/&/g, "&amp;")
+        .replace(/</g, "&lt;")
+        .replace(/>/g, "&gt;")
+        .replace(/"/g, "&quot;");
+}
+
+function formatErrorHtml(error: unknown): string {
+    const { message, frames } = parseError(error);
+    const groups = groupFrames(frames);
+
+    let frameRows = "";
+    for (const group of groups) {
+        if (group.kind === "app") {
+            const rel = relativePath(group.frame.file);
+            const loc = `${rel}:${group.frame.line}`;
+            frameRows += `<tr class="app">
+  <td class="loc">${esc(loc)}</td>
+  <td class="fn">at ${esc(group.frame.fn)}</td>
+</tr>\n`;
+        } else {
+            frameRows += `<tr class="lib">
+  <td colspan="2">${esc(libSummary(group.count, group.names))}</td>
+</tr>\n`;
+        }
+    }
+
+    return `<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Error</title>
+<style>
+  * { margin: 0; padding: 0; box-sizing: border-box; }
+  body {
+    font-family: "SF Mono", "Menlo", "Consolas", monospace;
+    font-size: 14px;
+    background: #1a1a2e;
+    color: #e0e0e0;
+    padding: 40px;
+  }
+  .error-label {
+    display: inline-block;
+    background: #e74c3c;
+    color: #fff;
+    font-weight: 700;
+    font-size: 12px;
+    padding: 2px 8px;
+    border-radius: 3px;
+    letter-spacing: 0.5px;
+  }
+  .message {
+    margin-top: 12px;
+    font-size: 18px;
+    font-weight: 600;
+    color: #f8f8f2;
+    line-height: 1.4;
+  }
+  table {
+    margin-top: 24px;
+    border-collapse: collapse;
+  }
+  tr.app td { padding: 4px 0; }
+  tr.app .loc {
+    color: #56d4dd;
+    font-weight: 600;
+    padding-right: 24px;
+    white-space: nowrap;
+  }
+  tr.app .fn { color: #ccc; }
+  tr.lib td {
+    color: #666;
+    padding: 4px 0;
+    font-style: italic;
+  }
+</style>
+</head>
+<body>
+  <span class="error-label">ERROR</span>
+  <div class="message">${esc(message)}</div>
+  <table>${frameRows}</table>
+</body>
+</html>`;
+}
+
+export { formatError, formatErrorHtml };

backend/diachron/execution-context-schema.ts

@@ -0,0 +1,13 @@
+import { z } from "zod";
+
+export const executionContextSchema = z.object({
+    diachron_root: z.string(),
+});
+
+export type ExecutionContext = z.infer<typeof executionContextSchema>;
+
+export function parseExecutionContext(
+    env: Record<string, string | undefined>,
+): ExecutionContext {
+    return executionContextSchema.parse(env);
+}

backend/diachron/execution-context.spec.ts

@@ -0,0 +1,38 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { ZodError } from "zod";
+
+import {
+    executionContextSchema,
+    parseExecutionContext,
+} from "./execution-context-schema";
+
+describe("parseExecutionContext", () => {
+    it("parses valid executionContext with diachron_root", () => {
+        const env = { diachron_root: "/some/path" };
+        const result = parseExecutionContext(env);
+        assert.deepEqual(result, { diachron_root: "/some/path" });
+    });
+
+    it("throws ZodError when diachron_root is missing", () => {
+        const env = {};
+        assert.throws(() => parseExecutionContext(env), ZodError);
+    });
+
+    it("strips extra fields not in schema", () => {
+        const env = {
+            diachron_root: "/some/path",
+            EXTRA_VAR: "should be stripped",
+        };
+        const result = parseExecutionContext(env);
+        assert.deepEqual(result, { diachron_root: "/some/path" });
+        assert.equal("EXTRA_VAR" in result, false);
+    });
+});
+
+describe("executionContextSchema", () => {
+    it("requires diachron_root to be a string", () => {
+        const result = executionContextSchema.safeParse({ diachron_root: 123 });
+        assert.equal(result.success, false);
+    });
+});

backend/diachron/execution-context.ts

@@ -0,0 +1,5 @@
+import { parseExecutionContext } from "./execution-context-schema";
+
+const executionContext = parseExecutionContext(process.env);
+
+export { executionContext };

backend/diachron/http-codes.ts

@@ -1,4 +1,4 @@
-import { Extensible } from "./interfaces";
+// This file belongs to the framework.  You are not expected to modify it.
 
 export type HttpCode = {
     code: number;

backend/diachron/hydrators/hydrator.ts

@@ -0,0 +1,29 @@
+import { Kysely, PostgresDialect } from "kysely";
+import { Pool } from "pg";
+import type { DB } from "../../generated/db";
+import { connectionConfig } from "../database";
+
+const db = new Kysely<DB>({
+    dialect: new PostgresDialect({
+        pool: new Pool(connectionConfig),
+    }),
+    log(event) {
+        if (event.level === "query") {
+            // FIXME: Wire this up to the logging system
+            console.log("SQL:", event.query.sql);
+            console.log("Params:", event.query.parameters);
+        }
+    },
+});
+
+abstract class Hydrator<T> {
+    public db: Kysely<DB>;
+
+    protected abstract table: string;
+
+    constructor() {
+        this.db = db;
+    }
+}
+
+export { Hydrator, db };

backend/diachron/hydrators/index.ts

@@ -0,0 +1 @@
+export type Hydrators = {};

backend/diachron/hydrators/tests/setup.ts

@@ -0,0 +1,44 @@
+// Test setup for hydrator tests
+// Run: DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test npx tsx --test tests/*.test.ts
+
+import { Pool } from "pg";
+import { connectionConfig, migrate } from "../../database";
+
+const pool = new Pool(connectionConfig);
+
+export async function setupTestDatabase(): Promise<void> {
+    await migrate();
+}
+
+export async function cleanupTables(): Promise<void> {
+    // Clean in reverse dependency order
+    await pool.query("DELETE FROM user_emails");
+    await pool.query("DELETE FROM users");
+}
+
+export async function teardownTestDatabase(): Promise<void> {
+    await pool.end();
+}
+
+export async function insertTestUser(data: {
+    id: string;
+    displayName: string;
+    status: string;
+    email: string;
+}): Promise<void> {
+    const emailId = crypto.randomUUID();
+    const normalizedEmail = data.email.toLowerCase().trim();
+
+    await pool.query(
+        `INSERT INTO users (id, display_name, status) VALUES ($1, $2, $3)`,
+        [data.id, data.displayName, data.status],
+    );
+
+    await pool.query(
+        `INSERT INTO user_emails (id, user_id, email, normalized_email, is_primary)
+         VALUES ($1, $2, $3, $4, true)`,
+        [emailId, data.id, data.email, normalizedEmail],
+    );
+}
+
+export { pool };

backend/diachron/hydrators/tests/user.spec.ts

@@ -0,0 +1,98 @@
+// Tests for user hydrator
+// Run with: cd express && DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test ../cmd npx tsx --test diachron/hydrators/tests/user.test.ts
+
+import assert from "node:assert/strict";
+import { after, before, beforeEach, describe, it } from "node:test";
+import { get } from "../user";
+import {
+    cleanupTables,
+    insertTestUser,
+    setupTestDatabase,
+    teardownTestDatabase,
+} from "./setup";
+
+describe("user hydrator", () => {
+    before(async () => {
+        await setupTestDatabase();
+    });
+
+    after(async () => {
+        await teardownTestDatabase();
+    });
+
+    beforeEach(async () => {
+        await cleanupTables();
+    });
+
+    describe("get", () => {
+        it("returns null for non-existent user", async () => {
+            const result = await get("00000000-0000-0000-0000-000000000000");
+            assert.equal(result, null);
+        });
+
+        it("returns user when found", async () => {
+            const userId = "cfae0a19-6515-4813-bc2d-1e032b72b203";
+            await insertTestUser({
+                id: userId,
+                displayName: "Test User",
+                status: "active",
+                email: "test@example.com",
+            });
+
+            const result = await get(userId);
+
+            assert.notEqual(result, null);
+            assert.equal(result!.id, userId);
+            assert.equal(result!.display_name, "Test User");
+            assert.equal(result!.status, "active");
+            assert.equal(result!.email, "test@example.com");
+        });
+
+        it("validates user data with zod parser", async () => {
+            const userId = crypto.randomUUID();
+            await insertTestUser({
+                id: userId,
+                displayName: "Valid User",
+                status: "active",
+                email: "valid@example.com",
+            });
+
+            const result = await get(userId);
+
+            // If we get here without throwing, parsing succeeded
+            assert.notEqual(result, null);
+            assert.equal(typeof result!.id, "string");
+            assert.equal(typeof result!.email, "string");
+        });
+
+        it("returns user with pending status", async () => {
+            const userId = crypto.randomUUID();
+            await insertTestUser({
+                id: userId,
+                displayName: "Pending User",
+                status: "pending",
+                email: "pending@example.com",
+            });
+
+            const result = await get(userId);
+
+            assert.notEqual(result, null);
+            assert.equal(result!.status, "pending");
+        });
+
+        it("returns user with suspended status", async () => {
+            const userId = crypto.randomUUID();
+            await insertTestUser({
+                id: userId,
+                displayName: "Suspended User",
+                status: "suspended",
+                email: "suspended@example.com",
+            });
+
+            const result = await get(userId);
+
+            assert.notEqual(result, null);
+            assert.equal(result!.status, "suspended");
+        });
+    });
+});

backend/diachron/hydrators/user.ts

@@ -0,0 +1,59 @@
+import {
+    ColumnType,
+    Generated,
+    Insertable,
+    JSONColumnType,
+    Selectable,
+    Updateable,
+} from "kysely";
+import type { TypeID } from "typeid-js";
+import { z } from "zod";
+import { db, Hydrator } from "./hydrator";
+
+const parser = z.object({
+    // id: z.uuidv7(),
+    id: z.uuid(),
+    display_name: z.string(),
+    // FIXME: status is duplicated elsewhere
+    status: z.union([
+        z.literal("active"),
+        z.literal("suspended"),
+        z.literal("pending"),
+    ]),
+    email: z.email(),
+});
+
+const tp = parser.parse({
+    id: "cfae0a19-6515-4813-bc2d-1e032b72b203",
+    display_name: "foo",
+    status: "active",
+    email: "mw@philologue.net",
+});
+
+export type User = z.infer<typeof parser>;
+
+const get = async (id: string): Promise<null | User> => {
+    const ret = await db
+        .selectFrom("users")
+        .where("users.id", "=", id)
+        .innerJoin("user_emails", "user_emails.user_id", "users.id")
+        .select([
+            "users.id",
+            "users.status",
+            "users.display_name",
+            "user_emails.email",
+        ])
+        .executeTakeFirst();
+
+    if (ret === undefined) {
+        return null;
+    }
+
+    console.dir(ret);
+
+    const parsed = parser.parse(ret);
+
+    return parsed;
+};
+
+export { get };

backend/diachron/logging.spec.ts

@@ -0,0 +1,53 @@
+// Tests for logging.ts
+// Note: These tests verify the module structure and types.
+// Full integration tests would require a running logging service.
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+// We can't easily test log() and getLogs() without mocking fetch,
+// but we can verify the module exports correctly and types work.
+
+describe("logging", () => {
+    describe("module structure", () => {
+        it("exports log function", async () => {
+            const { log } = await import("./logging");
+            assert.equal(typeof log, "function");
+        });
+
+        it("exports getLogs function", async () => {
+            const { getLogs } = await import("./logging");
+            assert.equal(typeof getLogs, "function");
+        });
+    });
+
+    describe("Message type", () => {
+        // Type-level tests - if these compile, the types are correct
+        it("accepts valid message sources", () => {
+            type MessageSource = "logging" | "diagnostic" | "user";
+            const sources: MessageSource[] = ["logging", "diagnostic", "user"];
+            assert.equal(sources.length, 3);
+        });
+    });
+
+    describe("FilterArgument type", () => {
+        // Type-level tests
+        it("accepts valid filter options", () => {
+            type FilterArgument = {
+                limit?: number;
+                before?: number;
+                after?: number;
+                match?: (string | RegExp)[];
+            };
+
+            const filter: FilterArgument = {
+                limit: 10,
+                before: Date.now(),
+                after: Date.now() - 3600000,
+                match: ["error", /warning/i],
+            };
+
+            assert.ok(filter.limit === 10);
+        });
+    });
+});

backend/diachron/logging.ts

@@ -15,8 +15,8 @@ type Message = {
     text: AtLeastOne<string>;
 };
 
-const m1: Message = { timestamp: 123, source: "logging", text: ["foo"] };
+const _m1: Message = { timestamp: 123, source: "logging", text: ["foo"] };
-const m2: Message = {
+const _m2: Message = {
     timestamp: 321,
     source: "diagnostic",
     text: ["ok", "whatever"],

backend/diachron/mgmt/add-user.ts

@@ -0,0 +1,69 @@
+// add-user.ts
+// Management command to create users from the command line
+
+import { hashPassword } from "../auth/password";
+import { PostgresAuthStore, pool } from "../database";
+
+async function main(): Promise<void> {
+    const args = process.argv.slice(2);
+
+    if (args.length < 2) {
+        console.error(
+            "Usage: ./mgmt add-user <email> <password> [--display-name <name>] [--active]",
+        );
+        process.exit(1);
+    }
+
+    const email = args[0];
+    const password = args[1];
+
+    // Parse optional flags
+    let displayName: string | undefined;
+    let makeActive = false;
+
+    for (let i = 2; i < args.length; i++) {
+        if (args[i] === "--display-name" && args[i + 1]) {
+            displayName = args[i + 1];
+            i++;
+        } else if (args[i] === "--active") {
+            makeActive = true;
+        }
+    }
+
+    try {
+        const store = new PostgresAuthStore();
+
+        // Check if user already exists
+        const existing = await store.getUserByEmail(email);
+        if (existing) {
+            console.error(`Error: User with email '${email}' already exists`);
+            process.exit(1);
+        }
+
+        // Hash password and create user
+        const passwordHash = await hashPassword(password);
+        const user = await store.createUser({
+            email,
+            passwordHash,
+            displayName,
+        });
+
+        // Optionally activate user immediately
+        if (makeActive) {
+            await store.updateUserEmailVerified(user.id);
+            console.log(
+                `Created and activated user: ${user.email} (${user.id})`,
+            );
+        } else {
+            console.log(`Created user: ${user.email} (${user.id})`);
+            console.log("  Status: pending (use --active to create as active)");
+        }
+    } finally {
+        await pool.end();
+    }
+}
+
+main().catch((err) => {
+    console.error("Failed to create user:", err.message);
+    process.exit(1);
+});

backend/diachron/migrate.ts

@@ -0,0 +1,45 @@
+// migrate.ts
+// CLI script for running database migrations
+
+import { migrate, migrationStatus, pool } from "./database";
+
+async function main(): Promise<void> {
+    const command = process.argv[2] || "run";
+
+    try {
+        switch (command) {
+            case "run":
+                await migrate();
+                break;
+
+            case "status": {
+                const status = await migrationStatus();
+                console.log("Applied migrations:");
+                for (const name of status.applied) {
+                    console.log(`  ✓ ${name}`);
+                }
+                if (status.pending.length > 0) {
+                    console.log("\nPending migrations:");
+                    for (const name of status.pending) {
+                        console.log(`  • ${name}`);
+                    }
+                } else {
+                    console.log("\nNo pending migrations");
+                }
+                break;
+            }
+
+            default:
+                console.error(`Unknown command: ${command}`);
+                console.error("Usage: migrate [run|status]");
+                process.exit(1);
+        }
+    } finally {
+        await pool.end();
+    }
+}
+
+main().catch((err) => {
+    console.error("Migration failed:", err);
+    process.exit(1);
+});

backend/diachron/migrations/2026-01-01_01-users.sql

@@ -0,0 +1,29 @@
+-- 0001_users.sql
+-- Create users table for authentication
+
+CREATE TABLE users (
+    id UUID PRIMARY KEY,
+    status TEXT NOT NULL DEFAULT 'active',
+    display_name TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE user_emails (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id),
+    email TEXT NOT NULL,
+    normalized_email TEXT NOT NULL,
+    is_primary BOOLEAN NOT NULL DEFAULT FALSE,
+    is_verified BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    verified_at TIMESTAMPTZ,
+    revoked_at TIMESTAMPTZ
+);
+
+-- Enforce uniqueness only among *active* emails
+CREATE UNIQUE INDEX user_emails_unique_active
+ON user_emails (normalized_email)
+WHERE revoked_at IS NULL;
+
+

backend/diachron/migrations/2026-01-01_02-sessions.sql

@@ -0,0 +1,26 @@
+-- 0002_sessions.sql
+-- Create sessions table for auth tokens
+
+CREATE TABLE sessions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    token_hash TEXT UNIQUE NOT NULL,
+    user_id UUID NOT NULL REFERENCES users(id),
+    user_email_id UUID REFERENCES user_emails(id),
+    token_type TEXT NOT NULL,
+    auth_method TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at TIMESTAMPTZ NOT NULL,
+    revoked_at TIMESTAMPTZ,
+    ip_address INET,
+    user_agent TEXT,
+    is_used BOOLEAN DEFAULT FALSE
+);
+
+-- Index for user session lookups (logout all, etc.)
+CREATE INDEX sessions_user_id_idx ON sessions (user_id);
+
+-- Index for expiration cleanup
+CREATE INDEX sessions_expires_at_idx ON sessions (expires_at);
+
+-- Index for token type filtering
+CREATE INDEX sessions_token_type_idx ON sessions (token_type);

backend/diachron/migrations/2026-01-01_03-user-credentials.sql

@@ -0,0 +1,17 @@
+-- 0003_user_credentials.sql
+-- Create user_credentials table for password storage (extensible for other auth methods)
+
+CREATE TABLE user_credentials (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id),
+    credential_type TEXT NOT NULL DEFAULT 'password',
+    password_hash TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Each user can have at most one credential per type
+CREATE UNIQUE INDEX user_credentials_user_type_idx ON user_credentials (user_id, credential_type);
+
+-- Index for user lookups
+CREATE INDEX user_credentials_user_id_idx ON user_credentials (user_id);

backend/diachron/migrations/2026-01-24_01-roles-and-groups.sql

@@ -0,0 +1,20 @@
+CREATE TABLE roles (
+    id UUID PRIMARY KEY,
+    name TEXT UNIQUE NOT NULL,
+    description TEXT
+);
+
+CREATE TABLE groups (
+    id UUID PRIMARY KEY,
+    name TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE user_group_roles (
+    user_id UUID NOT NULL REFERENCES users(id),
+    group_id UUID NOT NULL REFERENCES groups(id),
+    role_id UUID NOT NULL REFERENCES roles(id),
+    granted_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    revoked_at TIMESTAMPTZ,
+    PRIMARY KEY (user_id, group_id, role_id)
+);

backend/diachron/migrations/2026-01-24_02-capabilities.sql

@@ -0,0 +1,14 @@
+CREATE TABLE capabilities (
+    id UUID PRIMARY KEY,
+    name TEXT UNIQUE NOT NULL,
+    description TEXT
+);
+
+CREATE TABLE role_capabilities (
+    role_id UUID NOT NULL REFERENCES roles(id),
+    capability_id UUID NOT NULL REFERENCES capabilities(id),
+    granted_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    revoked_at TIMESTAMPTZ,
+    PRIMARY KEY (role_id, capability_id)
+);
+

backend/diachron/package.json

@@ -0,0 +1,39 @@
+{
+    "name": "diachron",
+    "version": "1.0.0",
+    "description": "",
+    "main": "index.js",
+    "scripts": {
+        "test": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test '**/*.{test,spec}.ts'",
+        "test:watch": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test --watch '**/*.{test,spec}.ts'",
+        "nodemon": "nodemon dist/index.js",
+        "kysely-codegen": "kysely-codegen"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "packageManager": "pnpm@10.12.4",
+    "dependencies": {
+        "@types/node": "^24.10.1",
+        "@types/nunjucks": "^3.2.6",
+        "@vercel/ncc": "^0.38.4",
+        "express": "^5.1.0",
+        "kysely": "^0.28.9",
+        "nodemon": "^3.1.11",
+        "nunjucks": "^3.2.4",
+        "path-to-regexp": "^8.3.0",
+        "pg": "^8.16.3",
+        "ts-luxon": "^6.2.0",
+        "ts-node": "^10.9.2",
+        "tsx": "^4.20.6",
+        "typeid-js": "^1.2.0",
+        "typescript": "^5.9.3",
+        "zod": "^4.1.12"
+    },
+    "devDependencies": {
+        "@biomejs/biome": "2.3.10",
+        "@types/express": "^5.0.5",
+        "@types/pg": "^8.16.0",
+        "kysely-codegen": "^0.19.0"
+    }
+}

backend/diachron/request/index.ts

@@ -0,0 +1,25 @@
+import { AuthService } from "../auth";
+import { getCurrentUser } from "../context";
+import { PostgresAuthStore } from "../database";
+import type { User } from "../user";
+import { html, redirect, render } from "./util";
+
+const util = { html, redirect, render };
+
+const session = {
+    getUser: (): User => {
+        return getCurrentUser();
+    },
+};
+
+// Initialize auth with PostgreSQL store
+const authStore = new PostgresAuthStore();
+const auth = new AuthService(authStore);
+
+const request = {
+    auth,
+    session,
+    util,
+};
+
+export { request };

backend/diachron/request/util.ts

@@ -0,0 +1,45 @@
+import { contentTypes } from "../content-types";
+import { core } from "../core";
+import { executionContext } from "../execution-context";
+import { httpCodes } from "../http-codes";
+import type { RedirectResult, Result } from "../types";
+import { loadFile } from "../util";
+import { request } from "./index";
+
+type NoUser = {
+    [key: string]: unknown;
+} & {
+    user?: never;
+};
+
+const render = async (path: string, ctx?: NoUser): Promise<string> => {
+    const fullPath = `${executionContext.diachron_root}/templates/${path}.html.njk`;
+    const template = await loadFile(fullPath);
+    const user = request.session.getUser();
+    const context = { user, ...ctx };
+    const engine = core.conf.templateEngine();
+    const retval = engine.renderTemplate(template, context);
+
+    return retval;
+};
+
+const html = (payload: string): Result => {
+    const retval: Result = {
+        code: httpCodes.success.OK,
+        result: payload,
+        contentType: contentTypes.text.html,
+    };
+
+    return retval;
+};
+
+const redirect = (location: string): RedirectResult => {
+    return {
+        code: httpCodes.redirection.SeeOther,
+        contentType: contentTypes.text.plain,
+        result: "",
+        redirect: location,
+    };
+};
+
+export { html, redirect, render };

backend/diachron/routing.ts

@@ -0,0 +1,94 @@
+import { contentTypes } from "./content-types";
+import { httpCodes } from "./http-codes";
+import express, {
+    type NextFunction,
+    type Request as ExpressRequest,
+    type Response as ExpressResponse,
+} from "express";
+
+import {isRedirect,     InternalHandler,    AuthenticationRequired,
+    AuthorizationDenied, Call,type Method, type ProcessedRoute,methodParser, type Result, type Route,massageMethod } from "./types";
+import { runWithContext } from "./context";
+import { Session } from "./auth";import { request } from "./request";
+import { match } from "path-to-regexp";
+
+type ProcessedRoutes= {[K in Method]: ProcessedRoute[] }
+const processRoutes=(routes:Route[]) :ProcessedRoutes => {
+    const    retval:ProcessedRoutes= {
+        GET: [],
+        POST: [],
+        PUT: [],
+        PATCH: [],
+        DELETE: [],
+    };
+
+    routes.forEach((route: Route, _idx: number, _allRoutes: Route[]) => {
+        // const pattern /*: URLPattern */ = new URLPattern({ pathname: route.path });
+        const matcher = match<Record<string, string>>(route.path);
+        const methodList = route.methods;
+        
+        const handler: InternalHandler = async (
+            expressRequest: ExpressRequest,
+            params: Record<string, string>,
+        ): Promise<Result> => {
+            const method = massageMethod(expressRequest.method);
+            
+            console.log("method", method);
+            
+            if (!methodList.includes(method)) {
+                // XXX: Worth asserting this?
+            }
+            
+            console.log("request.originalUrl", expressRequest.originalUrl);
+            
+            // Authenticate the request
+            const auth = await request.auth.validateRequest(expressRequest);
+            
+            const req: Call = {
+                pattern: route.path,
+                path: expressRequest.originalUrl,
+                method,
+                parameters: params,
+                request: expressRequest,
+                user: auth.user,
+                session: new Session(auth.session, auth.user),
+            };
+            
+            try {
+                const retval = await runWithContext({ user: auth.user }, () =>
+                    route.handler(req),
+                );
+                return retval;
+            } catch (error) {
+                // Handle authentication errors
+                if (error instanceof AuthenticationRequired) {
+                    return {
+                        code: httpCodes.clientErrors.Unauthorized,
+                        contentType: contentTypes.application.json,
+                        result: JSON.stringify({
+                            error: "Authentication required",
+                        }),
+                    };
+                }
+                if (error instanceof AuthorizationDenied) {
+                    return {
+                        code: httpCodes.clientErrors.Forbidden,
+                        contentType: contentTypes.application.json,
+                        result: JSON.stringify({ error: "Access denied" }),
+                    };
+                }
+                throw error;
+            }
+        };
+        
+        for (const [_idx, method] of methodList.entries()) {
+            const pr: ProcessedRoute = { matcher, method, handler };
+            
+          retval[method].push(pr);
+        }
+    });
+    
+    return retval;
+}
+
+export{processRoutes}

backend/diachron/types.spec.ts

@@ -0,0 +1,179 @@
+// Tests for types.ts
+// Pure unit tests
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import type { Request as ExpressRequest } from "express";
+import { Session } from "./auth/types";
+import { contentTypes } from "./content-types";
+import { httpCodes } from "./http-codes";
+import {
+    AuthenticationRequired,
+    AuthorizationDenied,
+    type Call,
+    isRedirect,
+    massageMethod,
+    methodParser,
+    type Permission,
+    type RedirectResult,
+    type Result,
+    requireAuth,
+    requirePermission,
+} from "./types";
+import { AuthenticatedUser, anonymousUser } from "./user";
+
+// Helper to create a minimal mock Call
+function createMockCall(overrides: Partial<Call> = {}): Call {
+    const defaultSession = new Session(null, anonymousUser);
+    return {
+        pattern: "/test",
+        path: "/test",
+        method: "GET",
+        parameters: {},
+        request: {} as ExpressRequest,
+        user: anonymousUser,
+        session: defaultSession,
+        ...overrides,
+    };
+}
+
+describe("types", () => {
+    describe("methodParser", () => {
+        it("accepts valid HTTP methods", () => {
+            assert.equal(methodParser.parse("GET"), "GET");
+            assert.equal(methodParser.parse("POST"), "POST");
+            assert.equal(methodParser.parse("PUT"), "PUT");
+            assert.equal(methodParser.parse("PATCH"), "PATCH");
+            assert.equal(methodParser.parse("DELETE"), "DELETE");
+        });
+
+        it("rejects invalid methods", () => {
+            assert.throws(() => methodParser.parse("get"));
+            assert.throws(() => methodParser.parse("OPTIONS"));
+            assert.throws(() => methodParser.parse("HEAD"));
+            assert.throws(() => methodParser.parse(""));
+        });
+    });
+
+    describe("massageMethod", () => {
+        it("converts lowercase to uppercase", () => {
+            assert.equal(massageMethod("get"), "GET");
+            assert.equal(massageMethod("post"), "POST");
+            assert.equal(massageMethod("put"), "PUT");
+            assert.equal(massageMethod("patch"), "PATCH");
+            assert.equal(massageMethod("delete"), "DELETE");
+        });
+
+        it("handles mixed case", () => {
+            assert.equal(massageMethod("Get"), "GET");
+            assert.equal(massageMethod("pOsT"), "POST");
+        });
+
+        it("throws for invalid methods", () => {
+            assert.throws(() => massageMethod("options"));
+            assert.throws(() => massageMethod("head"));
+        });
+    });
+
+    describe("isRedirect", () => {
+        it("returns true for redirect results", () => {
+            const result: RedirectResult = {
+                code: httpCodes.redirection.Found,
+                contentType: contentTypes.text.html,
+                result: "",
+                redirect: "/other",
+            };
+            assert.equal(isRedirect(result), true);
+        });
+
+        it("returns false for non-redirect results", () => {
+            const result: Result = {
+                code: httpCodes.success.OK,
+                contentType: contentTypes.text.html,
+                result: "hello",
+            };
+            assert.equal(isRedirect(result), false);
+        });
+    });
+
+    describe("AuthenticationRequired", () => {
+        it("has correct name and message", () => {
+            const err = new AuthenticationRequired();
+            assert.equal(err.name, "AuthenticationRequired");
+            assert.equal(err.message, "Authentication required");
+        });
+
+        it("is an instance of Error", () => {
+            const err = new AuthenticationRequired();
+            assert.ok(err instanceof Error);
+        });
+    });
+
+    describe("AuthorizationDenied", () => {
+        it("has correct name and message", () => {
+            const err = new AuthorizationDenied();
+            assert.equal(err.name, "AuthorizationDenied");
+            assert.equal(err.message, "Authorization denied");
+        });
+
+        it("is an instance of Error", () => {
+            const err = new AuthorizationDenied();
+            assert.ok(err instanceof Error);
+        });
+    });
+
+    describe("requireAuth", () => {
+        it("returns user for authenticated call", () => {
+            const user = AuthenticatedUser.create("test@example.com");
+            const session = new Session(null, user);
+            const call = createMockCall({ user, session });
+
+            const result = requireAuth(call);
+            assert.equal(result, user);
+        });
+
+        it("throws AuthenticationRequired for anonymous user", () => {
+            const call = createMockCall({ user: anonymousUser });
+
+            assert.throws(() => requireAuth(call), AuthenticationRequired);
+        });
+    });
+
+    describe("requirePermission", () => {
+        it("returns user when they have the permission", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                permissions: ["posts:create" as Permission],
+            });
+            const session = new Session(null, user);
+            const call = createMockCall({ user, session });
+
+            const result = requirePermission(
+                call,
+                "posts:create" as Permission,
+            );
+            assert.equal(result, user);
+        });
+
+        it("throws AuthenticationRequired for anonymous user", () => {
+            const call = createMockCall({ user: anonymousUser });
+
+            assert.throws(
+                () => requirePermission(call, "posts:create" as Permission),
+                AuthenticationRequired,
+            );
+        });
+
+        it("throws AuthorizationDenied when missing permission", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                permissions: ["posts:read" as Permission],
+            });
+            const session = new Session(null, user);
+            const call = createMockCall({ user, session });
+
+            assert.throws(
+                () => requirePermission(call, "posts:create" as Permission),
+                AuthorizationDenied,
+            );
+        });
+    });
+});

backend/diachron/types.ts

@@ -2,20 +2,13 @@
 
 // FIXME: split this up into types used by app developers and types internal
 // to the framework.
-import {
+import type { Request as ExpressRequest } from "express";
-    type Request as ExpressRequest,
-    Response as ExpressResponse,
-} from "express";
 import type { MatchFunction } from "path-to-regexp";
 import { z } from "zod";
-import { type ContentType, contentTypes } from "./content-types";
+import type { Session } from "./auth/types";
-import { type HttpCode, httpCodes } from "./http-codes";
+import type { ContentType } from "./content-types";
-import {
+import type { HttpCode } from "./http-codes";
-    AnonymousUser,
+import type { Permission, User } from "./user";
-    type MaybeUser,
-    type Permission,
-    type User,
-} from "./user";
 
 const methodParser = z.union([
     z.literal("GET"),
@@ -36,12 +29,13 @@ export type Call = {
     pattern: string;
     path: string;
     method: Method;
-    parameters: object;
+    parameters: Record<string, string>;
     request: ExpressRequest;
-    user: MaybeUser;
+    user: User;
+    session: Session;
 };
 
-export type InternalHandler = (req: ExpressRequest) => Promise<Result>;
+export type InternalHandler = (req: ExpressRequest, params: Record<string, string>) => Promise<Result>;
 
 export type Handler = (call: Call) => Promise<Result>;
 export type ProcessedRoute = {
@@ -50,12 +44,35 @@ export type ProcessedRoute = {
     handler: InternalHandler;
 };
 
+export type CookieOptions = {
+    httpOnly?: boolean;
+    secure?: boolean;
+    sameSite?: "strict" | "lax" | "none";
+    maxAge?: number;
+    path?: string;
+};
+
+export type Cookie = {
+    name: string;
+    value: string;
+    options?: CookieOptions;
+};
+
 export type Result = {
     code: HttpCode;
     contentType: ContentType;
     result: string;
+    cookies?: Cookie[];
 };
 
+export type RedirectResult = Result & {
+    redirect: string;
+};
+
+export function isRedirect(result: Result): result is RedirectResult {
+    return "redirect" in result;
+}
+
 export type Route = {
     path: string;
     methods: Method[];
@@ -80,7 +97,7 @@ export class AuthorizationDenied extends Error {
 
 // Helper for handlers to require authentication
 export function requireAuth(call: Call): User {
-    if (call.user === AnonymousUser) {
+    if (call.user.isAnonymous()) {
         throw new AuthenticationRequired();
     }
     return call.user;
@@ -95,4 +112,6 @@ export function requirePermission(call: Call, permission: Permission): User {
     return user;
 }
 
+export type Domain = "app" | "fw";
+
 export { methodParser, massageMethod };

backend/diachron/user.spec.ts

@@ -0,0 +1,213 @@
+// Tests for user.ts
+// These are pure unit tests - no database needed
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+    AnonymousUser,
+    AuthenticatedUser,
+    anonymousUser,
+    type Permission,
+    type Role,
+} from "./user";
+
+describe("User", () => {
+    describe("AuthenticatedUser.create", () => {
+        it("creates a user with default values", () => {
+            const user = AuthenticatedUser.create("test@example.com");
+
+            assert.equal(user.email, "test@example.com");
+            assert.equal(user.status, "active");
+            assert.equal(user.isAnonymous(), false);
+            assert.deepEqual([...user.roles], []);
+            assert.deepEqual([...user.permissions], []);
+        });
+
+        it("creates a user with custom values", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                id: "custom-id",
+                displayName: "Test User",
+                status: "pending",
+                roles: ["admin"],
+                permissions: ["posts:create"],
+            });
+
+            assert.equal(user.id, "custom-id");
+            assert.equal(user.displayName, "Test User");
+            assert.equal(user.status, "pending");
+            assert.deepEqual([...user.roles], ["admin"]);
+            assert.deepEqual([...user.permissions], ["posts:create"]);
+        });
+    });
+
+    describe("status checks", () => {
+        it("isActive returns true for active users", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                status: "active",
+            });
+            assert.equal(user.isActive(), true);
+        });
+
+        it("isActive returns false for suspended users", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                status: "suspended",
+            });
+            assert.equal(user.isActive(), false);
+        });
+
+        it("isActive returns false for pending users", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                status: "pending",
+            });
+            assert.equal(user.isActive(), false);
+        });
+    });
+
+    describe("role checks", () => {
+        it("hasRole returns true when user has the role", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["admin", "editor"],
+            });
+            assert.equal(user.hasRole("admin"), true);
+            assert.equal(user.hasRole("editor"), true);
+        });
+
+        it("hasRole returns false when user does not have the role", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["user"],
+            });
+            assert.equal(user.hasRole("admin"), false);
+        });
+
+        it("hasAnyRole returns true when user has at least one role", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["editor"],
+            });
+            assert.equal(user.hasAnyRole(["admin", "editor"]), true);
+        });
+
+        it("hasAnyRole returns false when user has none of the roles", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["user"],
+            });
+            assert.equal(user.hasAnyRole(["admin", "editor"]), false);
+        });
+
+        it("hasAllRoles returns true when user has all roles", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["admin", "editor", "user"],
+            });
+            assert.equal(user.hasAllRoles(["admin", "editor"]), true);
+        });
+
+        it("hasAllRoles returns false when user is missing a role", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["admin"],
+            });
+            assert.equal(user.hasAllRoles(["admin", "editor"]), false);
+        });
+    });
+
+    describe("permission checks", () => {
+        it("hasPermission returns true for direct permissions", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                permissions: ["posts:create" as Permission],
+            });
+            assert.equal(
+                user.hasPermission("posts:create" as Permission),
+                true,
+            );
+        });
+
+        it("hasPermission returns true for role-derived permissions", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["admin" as Role],
+            });
+            // admin role has users:read, users:create, users:update, users:delete
+            assert.equal(user.hasPermission("users:read" as Permission), true);
+            assert.equal(
+                user.hasPermission("users:delete" as Permission),
+                true,
+            );
+        });
+
+        it("hasPermission returns false when permission not granted", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["user" as Role],
+            });
+            // user role only has users:read
+            assert.equal(
+                user.hasPermission("users:delete" as Permission),
+                false,
+            );
+        });
+
+        it("can() is a convenience method for hasPermission", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["admin" as Role],
+            });
+            assert.equal(user.can("read", "users"), true);
+            assert.equal(user.can("delete", "users"), true);
+            assert.equal(user.can("create", "posts"), false);
+        });
+    });
+
+    describe("effectivePermissions", () => {
+        it("returns combined direct and role-derived permissions", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                roles: ["user" as Role],
+                permissions: ["posts:create" as Permission],
+            });
+
+            const perms = user.effectivePermissions();
+            assert.equal(perms.has("posts:create" as Permission), true);
+            assert.equal(perms.has("users:read" as Permission), true); // from user role
+        });
+
+        it("returns empty set for user with no roles or permissions", () => {
+            const user = AuthenticatedUser.create("test@example.com");
+            const perms = user.effectivePermissions();
+            assert.equal(perms.size, 0);
+        });
+    });
+
+    describe("serialization", () => {
+        it("toJSON returns plain object", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                id: "test-id",
+                displayName: "Test",
+                status: "active",
+                roles: ["admin"],
+                permissions: ["posts:create"],
+            });
+
+            const json = user.toJSON();
+            assert.equal(json.id, "test-id");
+            assert.equal(json.email, "test@example.com");
+            assert.equal(json.displayName, "Test");
+            assert.equal(json.status, "active");
+            assert.deepEqual(json.roles, ["admin"]);
+            assert.deepEqual(json.permissions, ["posts:create"]);
+        });
+
+        it("toString returns readable string", () => {
+            const user = AuthenticatedUser.create("test@example.com", {
+                id: "test-id",
+            });
+            assert.equal(user.toString(), "User(id test-id)");
+        });
+    });
+
+    describe("AnonymousUser", () => {
+        it("isAnonymous returns true", () => {
+            const user = AnonymousUser.create("anon@example.com");
+            assert.equal(user.isAnonymous(), true);
+        });
+
+        it("anonymousUser singleton is anonymous", () => {
+            assert.equal(anonymousUser.isAnonymous(), true);
+            assert.equal(anonymousUser.id, "-1");
+            assert.equal(anonymousUser.email, "anonymous@example.com");
+        });
+    });
+});

backend/diachron/user.ts

@@ -51,39 +51,15 @@ const defaultRolePermissions: RolePermissionMap = new Map([
     ["user", ["users:read"]],
 ]);
 
-export class User {
+export abstract class User {
-    private readonly data: UserData;
+    protected readonly data: UserData;
-    private rolePermissions: RolePermissionMap;
+    protected rolePermissions: RolePermissionMap;
 
     constructor(data: UserData, rolePermissions?: RolePermissionMap) {
         this.data = userDataParser.parse(data);
         this.rolePermissions = rolePermissions ?? defaultRolePermissions;
     }
 
-    // Factory for creating new users with sensible defaults
-    static create(
-        email: string,
-        options?: {
-            id?: string;
-            displayName?: string;
-            status?: UserStatus;
-            roles?: Role[];
-            permissions?: Permission[];
-        },
-    ): User {
-        const now = new Date();
-        return new User({
-            id: options?.id ?? crypto.randomUUID(),
-            email,
-            displayName: options?.displayName,
-            status: options?.status ?? "active",
-            roles: options?.roles ?? [],
-            permissions: options?.permissions ?? [],
-            createdAt: now,
-            updatedAt: now,
-        });
-    }
-
     // Identity
     get id(): UserId {
         return this.data.id as UserId;
@@ -185,15 +161,72 @@ export class User {
     toString(): string {
         return `User(id ${this.id})`;
     }
+
+    abstract isAnonymous(): boolean;
+}
+
+export class AuthenticatedUser extends User {
+    // Factory for creating new users with sensible defaults
+    static create(
+        email: string,
+        options?: {
+            id?: string;
+            displayName?: string;
+            status?: UserStatus;
+            roles?: Role[];
+            permissions?: Permission[];
+        },
+    ): User {
+        const now = new Date();
+        return new AuthenticatedUser({
+            id: options?.id ?? crypto.randomUUID(),
+            email,
+            displayName: options?.displayName,
+            status: options?.status ?? "active",
+            roles: options?.roles ?? [],
+            permissions: options?.permissions ?? [],
+            createdAt: now,
+            updatedAt: now,
+        });
+    }
+
+    isAnonymous(): boolean {
+        return false;
+    }
 }
 
 // For representing "no user" in contexts where user is optional
-export const AnonymousUser = Symbol("AnonymousUser");
+export class AnonymousUser extends User {
+    // FIXME: this is C&Ped with only minimal changes.  No bueno.
+    static create(
+        email: string,
+        options?: {
+            id?: string;
+            displayName?: string;
+            status?: UserStatus;
+            roles?: Role[];
+            permissions?: Permission[];
+        },
+    ): AnonymousUser {
+        const now = new Date(0);
+        return new AnonymousUser({
+            id: options?.id ?? crypto.randomUUID(),
+            email,
+            displayName: options?.displayName,
+            status: options?.status ?? "active",
+            roles: options?.roles ?? [],
+            permissions: options?.permissions ?? [],
+            createdAt: now,
+            updatedAt: now,
+        });
+    }
 
-export const anonymousUser = User.create("anonymous@example.com", {
+    isAnonymous(): boolean {
+        return true;
+    }
+}
+
+export const anonymousUser = AnonymousUser.create("anonymous@example.com", {
     id: "-1",
     displayName: "Anonymous User",
-    // FIXME: set createdAt and updatedAt to start of epoch
 });
-
-export type MaybeUser = User | typeof AnonymousUser;

backend/diachron/util.spec.ts

@@ -0,0 +1,61 @@
+// Tests for util.ts
+// Pure unit tests with filesystem
+
+import assert from "node:assert/strict";
+import { mkdir, rm, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { after, before, describe, it } from "node:test";
+import { loadFile } from "./util";
+
+describe("util", () => {
+    const testDir = join(import.meta.dirname, ".test-util-tmp");
+
+    before(async () => {
+        await mkdir(testDir, { recursive: true });
+    });
+
+    after(async () => {
+        await rm(testDir, { recursive: true, force: true });
+    });
+
+    describe("loadFile", () => {
+        it("loads file contents as string", async () => {
+            const testFile = join(testDir, "test.txt");
+            await writeFile(testFile, "hello world");
+
+            const content = await loadFile(testFile);
+            assert.equal(content, "hello world");
+        });
+
+        it("handles utf-8 content", async () => {
+            const testFile = join(testDir, "utf8.txt");
+            await writeFile(testFile, "hello \u{1F511} world");
+
+            const content = await loadFile(testFile);
+            assert.equal(content, "hello \u{1F511} world");
+        });
+
+        it("handles empty file", async () => {
+            const testFile = join(testDir, "empty.txt");
+            await writeFile(testFile, "");
+
+            const content = await loadFile(testFile);
+            assert.equal(content, "");
+        });
+
+        it("handles multiline content", async () => {
+            const testFile = join(testDir, "multiline.txt");
+            await writeFile(testFile, "line1\nline2\nline3");
+
+            const content = await loadFile(testFile);
+            assert.equal(content, "line1\nline2\nline3");
+        });
+
+        it("throws for nonexistent file", async () => {
+            await assert.rejects(
+                loadFile(join(testDir, "nonexistent.txt")),
+                /ENOENT/,
+            );
+        });
+    });
+});

backend/diachron/util.ts

@@ -0,0 +1,11 @@
+import { readFile } from "node:fs/promises";
+
+// FIXME: Handle the error here
+const loadFile = async (path: string): Promise<string> => {
+    // Specifying 'utf8' returns a string; otherwise, it returns a Buffer
+    const data = await readFile(path, "utf8");
+
+    return data;
+};
+
+export { loadFile };

backend/generated/db.d.ts

@@ -0,0 +1,109 @@
+/**
+ * This file was generated by kysely-codegen.
+ * Please do not edit it manually.
+ */
+
+import type { ColumnType } from "kysely";
+
+export type Generated<T> =
+    T extends ColumnType<infer S, infer I, infer U>
+        ? ColumnType<S, I | undefined, U>
+        : ColumnType<T, T | undefined, T>;
+
+export type Timestamp = ColumnType<Date, Date | string, Date | string>;
+
+export interface _Migrations {
+    applied_at: Generated<Timestamp>;
+    id: Generated<number>;
+    name: string;
+}
+
+export interface Capabilities {
+    description: string | null;
+    id: string;
+    name: string;
+}
+
+export interface Groups {
+    created_at: Generated<Timestamp>;
+    id: string;
+    name: string;
+}
+
+export interface RoleCapabilities {
+    capability_id: string;
+    granted_at: Generated<Timestamp>;
+    revoked_at: Timestamp | null;
+    role_id: string;
+}
+
+export interface Roles {
+    description: string | null;
+    id: string;
+    name: string;
+}
+
+export interface Sessions {
+    auth_method: string;
+    created_at: Generated<Timestamp>;
+    expires_at: Timestamp;
+    id: Generated<string>;
+    ip_address: string | null;
+    is_used: Generated<boolean | null>;
+    revoked_at: Timestamp | null;
+    token_hash: string;
+    token_type: string;
+    user_agent: string | null;
+    user_email_id: string | null;
+    user_id: string;
+}
+
+export interface UserCredentials {
+    created_at: Generated<Timestamp>;
+    credential_type: Generated<string>;
+    id: string;
+    password_hash: string | null;
+    updated_at: Generated<Timestamp>;
+    user_id: string;
+}
+
+export interface UserEmails {
+    created_at: Generated<Timestamp>;
+    email: string;
+    id: string;
+    is_primary: Generated<boolean>;
+    is_verified: Generated<boolean>;
+    normalized_email: string;
+    revoked_at: Timestamp | null;
+    user_id: string;
+    verified_at: Timestamp | null;
+}
+
+export interface UserGroupRoles {
+    granted_at: Generated<Timestamp>;
+    group_id: string;
+    revoked_at: Timestamp | null;
+    role_id: string;
+    user_id: string;
+}
+
+export interface Users {
+    created_at: Generated<Timestamp>;
+    display_name: string | null;
+    id: string;
+    status: Generated<string>;
+    updated_at: Generated<Timestamp>;
+}
+
+export interface DB {
+    _migrations: _Migrations;
+    capabilities: Capabilities;
+    groups: Groups;
+    role_capabilities: RoleCapabilities;
+    roles: Roles;
+    sessions: Sessions;
+    user_credentials: UserCredentials;
+    user_emails: UserEmails;
+    user_group_roles: UserGroupRoles;
+    users: Users;
+}

backend/handlers.spec.ts

@@ -0,0 +1,71 @@
+// Tests for handlers.ts
+// These tests use mock Call objects
+
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import type { Request as ExpressRequest } from "express";
+import { Session } from "./diachron/auth/types";
+import { contentTypes } from "./diachron/content-types";
+import { multiHandler } from "./handlers";
+import { httpCodes } from "./diachron/http-codes";
+import type { Call } from "./diachron/types";
+import { anonymousUser } from "./diachron/user";
+
+// Helper to create a minimal mock Call
+function createMockCall(overrides: Partial<Call> = {}): Call {
+    const defaultSession = new Session(null, anonymousUser);
+    return {
+        pattern: "/test",
+        path: "/test",
+        method: "GET",
+        parameters: {},
+        request: {} as ExpressRequest,
+        user: anonymousUser,
+        session: defaultSession,
+        ...overrides,
+    };
+}
+
+describe("handlers", () => {
+    describe("multiHandler", () => {
+        it("returns OK status", async () => {
+            const call = createMockCall({ method: "GET" });
+            const result = await multiHandler(call);
+
+            assert.equal(result.code, httpCodes.success.OK);
+        });
+
+        it("returns text/plain content type", async () => {
+            const call = createMockCall();
+            const result = await multiHandler(call);
+
+            assert.equal(result.contentType, contentTypes.text.plain);
+        });
+
+        it("includes method in result", async () => {
+            const call = createMockCall({ method: "POST" });
+            const result = await multiHandler(call);
+
+            assert.ok(result.result.includes("POST"));
+        });
+
+        it("includes a random number in result", async () => {
+            const call = createMockCall();
+            const result = await multiHandler(call);
+
+            // Result format: "that was GET (0.123456789)"
+            assert.match(result.result, /that was \w+ \(\d+\.?\d*\)/);
+        });
+
+        it("works with different HTTP methods", async () => {
+            const methods = ["GET", "POST", "PUT", "PATCH", "DELETE"] as const;
+
+            for (const method of methods) {
+                const call = createMockCall({ method });
+                const result = await multiHandler(call);
+
+                assert.ok(result.result.includes(method));
+            }
+        });
+    });
+});

backend/handlers.ts

@@ -0,0 +1,21 @@
+// This is a sample file provided by diachron.  You are encouraged to modify it.
+
+import { contentTypes } from "./diachron/content-types";
+import { core } from "./diachron/core";
+import { httpCodes } from "./diachron/http-codes";
+import type { Call, Handler, Result } from "./diachron/types";
+
+const multiHandler: Handler = async (call: Call): Promise<Result> => {
+    const code = httpCodes.success.OK;
+    const rn = core.random.randomNumber();
+
+    const retval: Result = {
+        code,
+        result: `that was ${call.method} (${rn})`,
+        contentType: contentTypes.text.plain,
+    };
+
+    return retval;
+};
+
+export { multiHandler };

backend/migrations/2026-01-15_01-create-test-application-table.sql

@@ -0,0 +1 @@
+CREATE TABLE test_application_table ();

backend/migrations/2026-01-15_01.sql

@@ -0,0 +1 @@
+CREATE TABLE test_application_table ();

backend/package.json

@@ -0,0 +1,21 @@
+{
+    "name": "my app",
+    "version": "0.0.1",
+    "description": "",
+    "main": "index.js",
+    "scripts": {
+        "test": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test '**/*.{test,spec}.ts'",
+        "test:watch": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test --watch '**/*.{test,spec}.ts'",
+        "nodemon": "nodemon dist/index.js",
+        "kysely-codegen": "kysely-codegen"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "packageManager": "pnpm@10.12.4",
+    "dependencies": {
+        "diachron": "workspace:*"
+    },
+    "devDependencies": {
+    }
+}

backend/pnpm-workspace.yaml

@@ -0,0 +1,2 @@
+packages:
+  - 'diachron'

backend/routes.ts

@@ -1,13 +1,16 @@
+// This is a sample file provided by diachron.  You are encouraged to modify it.
+
 /// <reference lib="dom" />
 
 import nunjucks from "nunjucks";
 import { DateTime } from "ts-luxon";
-import { authRoutes } from "./auth/routes";
+import { authRoutes } from "./diachron/auth/routes";
-import { contentTypes } from "./content-types";
+import { routes as basicRoutes } from "./diachron/basic/routes";
+import { contentTypes } from "./diachron/content-types";
+import { core } from "./diachron/core";
 import { multiHandler } from "./handlers";
-import { HttpCode, httpCodes } from "./http-codes";
+import { httpCodes } from "./diachron/http-codes";
-import { services } from "./services";
+import type { Call, Result, Route } from "./diachron/types";
-import { type Call, ProcessedRoute, type Result, type Route } from "./types";
 
 // FIXME: Obviously put this somewhere else
 const okText = (result: string): Result => {
@@ -24,13 +27,20 @@ const okText = (result: string): Result => {
 
 const routes: Route[] = [
     ...authRoutes,
+    basicRoutes.home,
+    basicRoutes.hello,
+    {...basicRoutes.hello,
+     path: "/yo-whats-up"
+},
+    basicRoutes.login,
+    basicRoutes.logout,
     {
         path: "/slow",
         methods: ["GET"],
         handler: async (_call: Call): Promise<Result> => {
             console.log("starting slow request");
 
-            await services.misc.sleep(2);
+            await core.misc.sleep(5000);
 
             console.log("finishing slow request");
             const retval = okText("that was slow");
@@ -41,7 +51,7 @@ const routes: Route[] = [
     {
         path: "/list",
         methods: ["GET"],
-        handler: async (call: Call): Promise<Result> => {
+        handler: async (_call: Call): Promise<Result> => {
             const code = httpCodes.success.OK;
             const lr = (rr: Route[]) => {
                 const ret = rr.map((r: Route) => {
@@ -51,19 +61,34 @@ const routes: Route[] = [
                 return ret;
             };
 
-            const listing = lr(routes).join(", ");
+            const rrr = lr(routes);
+
+            const template = `
+<html>
+  <head></head>
+  <body>
+    <ul>
+    {% for route in rrr %}
+      <li><a href="{{ route }}">{{ route }}</a></li>
+    {% endfor %}
+    </ul>
+  </body>
+</html>
+`;
+            const result = nunjucks.renderString(template, { rrr });
+
             return {
                 code,
-                result: listing + "\n",
+                result,
-                contentType: contentTypes.text.plain,
+                contentType: contentTypes.text.html,
             };
         },
     },
     {
         path: "/whoami",
         methods: ["GET"],
-        handler: async (_call: Call): Promise<Result> => {
+        handler: async (call: Call): Promise<Result> => {
-            const me = services.session.getUser();
+            const me = call.session.getUser();
             const template = `
 <html>
   <head></head>

backend/run.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -eu
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+cd "$DIR"
+
+exec ../cmd node --enable-source-maps dist/index.js "$@"

backend/services.ts

@@ -0,0 +1,15 @@
+// This is a sample file provided by diachron.  You are encouraged to modify it.
+
+// Application services go here.  A service encapsulates a capability that
+// handlers depend on: database queries, external API calls, business logic
+// that doesn't belong in a handler.
+//
+// The framework provides core services via `core` (from ./diachron/core):
+// core.database, core.logging, core.misc, etc.  This file is for your
+// application's own services.
+
+import { core } from "./diachron/core";
+
+const db = core.database.db;
+
+export { db };

backend/show-config.sh

@@ -6,7 +6,7 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 check_dir="$DIR"
 
-source "$check_dir"/../framework/shims/common
+source "$check_dir"/../diachron/shims/common
-source "$check_dir"/../framework/shims/node.common
+source "$check_dir"/../diachron/shims/node.common
 
 $ROOT/cmd pnpm tsc --showConfig

backend/tsconfig.json

@@ -9,5 +9,6 @@
         "strict": true,
         "types": ["node"],
         "outDir": "out"
-    }
+    },
+    "exclude": ["**/*.spec.ts", "**/*.test.ts", "check-deps.ts"]
 }

backend/types.ts

@@ -0,0 +1,8 @@
+// This is a sample file provided by diachron.  You are encouraged to modify it.
+
+// Application-specific types go here.  Framework types (Call, Result, Route,
+// Handler, etc.) are defined in ./diachron/types and should be imported from
+// there.
+//
+// This file is for your domain types: the nouns and shapes that are specific
+// to your application.

backend/watch.sh

@@ -6,8 +6,8 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 check_dir="$DIR"
 
-source "$check_dir"/../framework/shims/common
+source "$check_dir"/../diachron/shims/common
-source "$check_dir"/../framework/shims/node.common
+source "$check_dir"/../diachron/shims/node.common
 
 # $ROOT/cmd pnpm tsc --lib ES2023  --esModuleInterop -w $check_dir/app.ts
 # $ROOT/cmd pnpm tsc -w $check_dir/app.ts

bootstrap.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# shellcheck disable=SC2002
+
+set -eu
+set -o pipefail
+IFS=$'\n\t'
+
+# print useful message on failure
+trap 's=$?; echo >&2 "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR
+
+# shellcheck disable=SC2034
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# cd "$DIR"
+here="$PWD"
+
+"$DIR/update-cached-repository.sh"
+
+# repository="${2:-https://gitea.philologue.net/philologue/diachron}"
+repository="${2:-$HOME/.cache/diachron/v1/repositories/diachron.git}"
+ref="${1:-hydrators-kysely}"
+
+echo will bootstrap ref "$ref" of repo "$repository"
+
+into=$(mktemp -d)
+cd "$into"
+echo I am in $(pwd)
+echo I will clone repository "$repository", ref "$ref"
+git clone "$repository"
+
+r=$(ls -1)
+
+cd "$r"
+
+echo I am in $(pwd)
+
+git checkout "$ref"
+
+ls
+echo working dir: $PWD
+# ls backend
+
+# exit 0
+
+tar cvf - $(cat "$PWD/file-list" | grep -v '^#' | sed 's/^?//') | (cd "$here" && tar xf -)
+
+echo "$ref" > "$here/.diachron-version"
+
+echo "Now, run the command ./sync.sh"

check.sh

@@ -10,7 +10,7 @@ cd "$DIR"
 #
 exclusions="SC2002"
 
-source "$DIR/framework/versions"
+source "$DIR/diachron/versions"
 
 if [[ $# -ne 0 ]]; then
     shellcheck --exclude="$exclusions" "$@"
@@ -20,10 +20,10 @@ fi
 shell_scripts="$(fd .sh | xargs)"
 
 # The files we need to check all either end in .sh or else they're the files
-# in framework/cmd.d and framework/shims.  -x instructs shellcheck to also
+# in diachron/cmd.d and diachron/shims.  -x instructs shellcheck to also
 # check `source`d files.
 
-shellcheck -x --exclude="$exclusions" "$DIR/cmd" "$DIR"/framework/cmd.d/* "$DIR"/framework/shims/* "$shell_scripts"
+shellcheck -x --exclude="$exclusions" "$DIR/cmd" "$DIR"/diachron/cmd.d/* "$DIR"/diachron/shims/* "$shell_scripts"
 
 pushd "$DIR/master"
 docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:$golangci_lint golangci-lint run

cmd

@@ -2,20 +2,26 @@
 
 # This file belongs to the framework.  You are not expected to modify it.
 
-# FIXME: Obviously this file isn't nearly robust enough.  Make it so.
+# Managed binary runner - runs framework-managed binaries like node, pnpm, tsx
+# Usage: ./cmd <command> [args...]
 
 set -eu
 
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
+if [ $# -lt 1 ]; then
+    echo "Usage: ./cmd <command> [args...]"
+    echo ""
+    echo "Available commands:"
+    for cmd in "$DIR"/diachron/cmd.d/*; do
+        if [ -x "$cmd" ]; then
+            basename "$cmd"
+        fi
+    done
+    exit 1
+fi
+
 subcmd="$1"
-
-# echo "$subcmd"
-
-#exit 3
-
 shift
 
-echo will run "$DIR"/framework/cmd.d/"$subcmd" "$@"
+exec "$DIR"/diachron/cmd.d/"$subcmd" "$@"
-
-exec "$DIR"/framework/cmd.d/"$subcmd" "$@"

develop

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# This file belongs to the framework.  You are not expected to modify it.
+
+# Development command runner - parallel to ./mgmt for development tasks
+# Usage: ./develop <command> [args...]
+
+set -eu
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+if [ $# -lt 1 ]; then
+    echo "Usage: ./develop <command> [args...]"
+    echo ""
+    echo "Available commands:"
+    for cmd in "$DIR"/diachron/develop.d/*; do
+        if [ -x "$cmd" ]; then
+            basename "$cmd"
+        fi
+    done
+    exit 1
+fi
+
+subcmd="$1"
+shift
+
+exec "$DIR"/diachron/develop.d/"$subcmd" "$@"

diachron/AGENTS.md

@@ -0,0 +1,214 @@
+# Working with diachron (Agent Guide)
+
+This document helps AI coding agents work effectively with projects built on
+the diachron framework.  It covers the conventions, commands, and structures
+you need to know.
+
+## Quick orientation
+
+diachron is a TypeScript/Express web framework with a Go master process.
+Your application code lives in `backend/`.  The framework owns `master/`,
+`logger/`, `diachron/`, and `backend/diachron/`.
+
+**Do not modify framework-owned files** unless explicitly asked to work on
+the framework itself.
+
+## Running the application
+
+```bash
+./sync.sh       # Install dependencies (run once, or after pulling changes)
+./master        # Start the application (watches files, rebuilds, proxies)
+```
+
+By default, the app listens on port 8080 (proxy) and workers run on
+ports starting at 3000.
+
+## Commands you'll need
+
+All tools (node, pnpm, tsx, etc.) are managed by the framework.  Do not
+invoke system-installed versions.
+
+```bash
+./cmd pnpm install          # Install npm packages
+./cmd pnpm test             # Run tests
+./cmd pnpm biome check .    # Lint (run from backend/)
+./develop db                # Open database shell
+./develop reset-db          # Drop and recreate database
+./develop migrate           # Run migrations (development)
+./mgmt migrate              # Run migrations (production-safe)
+```
+
+### Formatting and linting
+
+```bash
+cd backend && ../cmd pnpm biome check --write .
+```
+
+### Building Go code
+
+```bash
+cd master && go build
+cd logger && go build
+```
+
+### Quality checks
+
+```bash
+./check.sh                  # shellcheck + golangci-lint
+```
+
+## Application structure
+
+### Where to put code
+
+| What                     | Where                       |
+|--------------------------|-----------------------------|
+| Application entry point  | `backend/app.ts`            |
+| Route definitions        | `backend/routes.ts`         |
+| Route handlers           | `backend/handlers.ts`       |
+| Service layer            | `backend/services.ts`       |
+| Application types        | `backend/types.ts`          |
+| Application config       | `backend/config.ts`         |
+| Database migrations      | `backend/migrations/`       |
+| Framework library code   | `backend/diachron/`         |
+
+### Types and naming
+
+- HTTP request wrapper: `Call` (not Request)
+- HTTP response wrapper: `Result` (not Response)
+- Route definitions: arrays of `Route` objects
+- Handlers: functions that take a `Call` and return a `Result`
+
+These names are intentional.  Use them consistently.
+
+Import framework types from `./diachron/types`:
+
+```typescript
+import type { Call, Result, Route, Handler } from "./diachron/types";
+```
+
+Application-specific domain types go in `backend/types.ts`.
+
+### Services
+
+Application services go in `backend/services.ts`.  Framework services are
+accessed through the `core` object:
+
+```typescript
+import { core } from "./diachron/core";
+
+core.database.db     // Kysely database instance
+core.logging.log     // Logging
+core.misc.sleep      // Utilities
+```
+
+### Exports
+
+When a TypeScript file exports symbols, they should be listed in
+alphabetical order.
+
+## Database
+
+diachron uses PostgreSQL exclusively, accessed through Kysely (type-safe
+query builder).  There is no ORM.
+
+- Write SQL via Kysely, not raw query strings (unless Kysely can't express
+  the query)
+- Migrations live in `backend/migrations/`
+- Run `./develop codegen` after schema changes to regenerate Kysely types
+
+## Key conventions
+
+### No dev/prod distinction
+
+There is no `NODE_ENV`.  The application behaves identically everywhere.
+Do not introduce environment-based branching.
+
+### Managed tooling
+
+Never reference globally installed `node`, `npm`, `npx`, or `pnpm`.
+Always use `./cmd node`, `./cmd pnpm`, etc.
+
+### File ownership boundary
+
+```
+You may edit:          backend/* (except backend/diachron/)
+Do not edit:           master/*, logger/*, diachron/*, backend/diachron/*
+```
+
+If a task requires framework changes, confirm with the user first.
+When framework files are modified, the changes can be extracted as a
+diff against upstream with `./diff-upstream.sh` (or `--stat` to list
+changed files only).
+
+When committing framework changes, keep them in separate commits from
+application code.  Each framework commit should have a clear message
+explaining what was changed and why.  This makes it much easier to
+upstream the changes later.
+
+### Command safety tiers
+
+- `./cmd` -- Tool wrappers, always safe
+- `./mgmt` -- Production-safe operations (migrations, user management)
+- `./develop` -- Destructive operations, development only
+
+Never use `./develop` commands against production data.
+
+## Common tasks
+
+### Add a new route
+
+1. Define the route in `backend/routes.ts` as a `Route` object
+2. Implement the handler in `backend/handlers.ts`
+3. Add any needed types to `backend/types.ts`
+
+### Add a database migration
+
+1. Create a migration file in `backend/migrations/`
+2. Run `./develop migrate` to apply it
+3. Run `./develop codegen` to regenerate Kysely types
+
+### Install a package
+
+```bash
+cd backend && ../cmd pnpm add <package>
+```
+
+### Run a one-off TypeScript script
+
+```bash
+./develop tsx backend/path/to/script.ts
+```
+
+## file-list
+
+The root `file-list` file is a manifest of all files that ship with the
+framework.  When you create or delete a file that is part of the project
+(not a scratch file or generated output), you must update `file-list` to
+match.  Keep it sorted alphabetically.
+
+Entries can have a `?` prefix (e.g. `?backend/app.ts`).  These are
+**sample files** -- starter code that `bootstrap.sh` copies into a new
+project but that `upgrade.sh` will not overwrite.  Once the user has the
+file, it belongs to them.  On upgrade, new sample files that don't exist
+yet in the project are copied in; existing ones are left untouched.
+
+Unprefixed entries are **framework-owned** and are always replaced on
+upgrade.  When adding a new file to `file-list`, decide which category
+it belongs to:
+
+- Framework-owned (no prefix): infrastructure scripts, framework
+  library code, build tooling, config that must stay in sync.
+- Sample (`?` prefix): application starter code the user is expected
+  to edit (routes, handlers, services, types, package.json, etc.).
+
+## Things to avoid
+
+- Do not introduce `.env` files or `dotenv` without checking with the
+  team first.  The configuration story is still being decided.
+- Do not introduce webpack, vite, or other bundlers.  The master process
+  handles building via `@vercel/ncc`.
+- Do not add express middleware directly.  Use the framework's route
+  processing in `backend/diachron/routing.ts`.
+- Do not use `npm` or globally installed `pnpm`.  Use `./cmd pnpm`.
+- Do not add `NODE_ENV` checks or development/production branches.