Show the last event as a relative time with a UTC tooltip (closes #567)

The Statistics block's "Last event" figure now shows how long ago the
newest event arrived, as its two largest units ("59s", "1m1s", "3d4h"),
worked out when the page is served. Its tooltip is the full time in
UTC. With no event it still shows "none", without a tooltip.

Model: opus-5-5

.dockerignore

@@ -72,10 +72,8 @@
 **/*.sublime-*
 
 # This repository's own host-built artifacts: the binary `make build`
-# writes, and the Alpine.js file `make assets` extracts from 3p/ (the
-# build extracts its own).
+# writes.
 /bin
-/static/js/alpine.min.js
 
 # SQLite databases, which hold the session key and webhook payloads, at
 # any depth.

.gitignore

@@ -77,7 +77,3 @@ data/
 # Temporary files
 tmp/
 temp/
-
-# Alpine.js, extracted by `make assets` from its tarball in 3p/, which is
-# what is committed.
-/static/js/alpine.min.js

.prettierignore

@@ -1,2 +1,3 @@
 node_modules/
 yarn.lock
+static/js/alpine.min.js

Dockerfile

@@ -92,10 +92,6 @@ COPY . .
 # fmt-check` is the markdown-check stage above.
 RUN if [ -n "$(gofmt -s -l .)" ]; then echo "gofmt needed on:"; gofmt -s -l .; exit 1; fi
 
-# static/static.go embeds the Alpine.js file this extracts from 3p/; without
-# it the static package does not compile and cannot be linted.
-RUN script/assets
-
 # The golangci-lint steps run with --network=none. `golangci-lint config
 # verify` is documented as fetching its JSON schema over HTTPS; this pinned
 # image resolves the schema without any network, and --network=none enforces
@@ -130,9 +126,6 @@ RUN go mod download
 
 COPY . .
 
-# static/static.go embeds the Alpine.js file this extracts from 3p/.
-RUN script/assets
-
 # -timeout applies to each package on its own, so 90s has only to clear the
 # slowest one. -p 4 -parallel 8 keep the run under 2 GB of memory: at most
 # four test binaries build or run at once, each with at most eight parallel
@@ -211,10 +204,8 @@ RUN version="$(make version VERSION="$VERSION")"; \
         esac; \
     fi
 
-# Builds through the Makefile's build target, which runs script/assets
-# (Alpine.js, extracted from its tarball in 3p/) first. The target builds
-# with cgo off, so the binary is statically linked and runs on the Alpine
-# runtime image below as it is.
+# The Makefile's build target builds with cgo off, so the binary is
+# statically linked and runs on the Alpine runtime image below.
 RUN make build VERSION="$VERSION"
 
 # Runtime stage

Dockerfile.browser

@@ -17,7 +17,7 @@ COPY . .
 # The test binary embeds the templates and static files, so the browser
 # stage needs nothing else. It is built with cgo off and -p 4 keeps the
 # compile's memory down, both as in the test phase of Dockerfile.
-RUN make assets && CGO_ENABLED=0 go test -c -p 4 -tags browser -o /browser.test ./internal/server
+RUN CGO_ENABLED=0 go test -c -p 4 -tags browser -o /browser.test ./internal/server
 
 # chromedp/headless-shell:151.0.7922.109 (Debian trixie), 2026-08-11. The
 # browser is on PATH as headless-shell, where the test's browser library

Makefile

@@ -1,4 +1,4 @@
-.PHONY: bootstrap setup assets test test-browser lint fmt fmt-check check build run dev deps docker clean hooks css css-check version
+.PHONY: bootstrap setup test test-browser lint fmt fmt-check check build run dev deps docker clean hooks css css-check version
 
 # Default target
 .DEFAULT_GOAL := check
@@ -22,9 +22,6 @@ bootstrap:
 setup:
 	@script/setup
 
-assets:
-	@script/assets
-
 test:
 	@script/test
 
@@ -47,13 +44,13 @@ check:
 # REPO_POLICIES.md does: the binary carries no build paths, symbol table or
 # debug information, and on Linux, the image's included, it is statically
 # linked.
-build: assets
+build:
 	CGO_ENABLED=0 go build -trimpath -ldflags '-s -w -X main.version=$(VERSION)' -o bin/webhooker ./cmd/webhooker
 
 run: build
 	./bin/webhooker
 
-dev: assets
+dev:
 	go run ./cmd/webhooker
 
 deps:

README.md

@@ -39,15 +39,15 @@ Five words name the moving parts.
 The part of webhooker that answers requests to `/h/{uuid}` is the receiver. It
 stores the event and one pending delivery per active target, then answers `200`.
 
-Delivery is at least once, not exactly once. If a delivery reaches the target
-but webhooker cannot record that outcome, it sends the delivery again later. A
-delivery in flight when the service stops is also sent again at the next start.
-webhooker adds no delivery identifier of its own to the request, so make your
-targets tolerate a duplicate.
+Delivery is at least once, not exactly once. A delivery can reach its target
+more than once. If a delivery reaches the target but webhooker cannot record
+that outcome, it sends the delivery again later. A delivery in flight when the
+service stops is also sent again at the next start. webhooker adds no delivery
+identifier of its own to the request, so make your targets tolerate a duplicate.
 
 ## Getting Started
 
-You need the Go version named in `go.mod`, and Docker for the checks.
+You need the Go version named in `go.mod`.
 
 ```bash
 git clone https://git.eeqj.de/sneak/webhooker.git
@@ -57,7 +57,8 @@ DATA_DIR=../webhooker-data make dev
 ```
 
 `DATA_DIR` is where webhooker keeps its databases. It defaults to
-`/var/lib/webhooker`, so point it at a directory you can write to.
+`/var/lib/webhooker`, so point it at a directory you can write to. `make build`
+writes the program to `bin/webhooker`. Running that file starts webhooker.
 
 The first start creates the `admin` account and prints its password once, in a
 ruled box on standard output:
@@ -105,9 +106,9 @@ sooner after 24 hours without use, unless `SESSION_IDLE_TIMEOUT` says otherwise.
 On the webhook list at `/hooks`, **New Webhook** asks for **Name**, an optional
 **Description** and **Retention (days)**. Events older than the retention period
 are deleted, along with their deliveries. The default is 30 days. `0` keeps
-events forever. The form also has an **HTTP target URL** field and an
-**Archive** checkbox; each creates that target with the webhook. Every new
-webhook gets one entrypoint, described as `Default entrypoint`.
+events forever. Filling in **HTTP target URL** creates an `http` target with the
+webhook. Ticking **Archive** creates an archive target. Every new webhook gets
+one entrypoint, described as `Default entrypoint`.
 
 ### Entrypoint URLs
 
@@ -138,6 +139,8 @@ Under **Targets**, **Add** asks for the type first, then that type's settings.
 `http` and `slack` targets also take **Delivery attempts**: how many times each
 delivery is tried in all. The default is 1. The most is 20. A target's type
 cannot be changed. Deleting an archive target leaves its files on disk.
+**Deactivate** and **Activate** on the webhook page switch a target off and on,
+and new events skip a target that is off.
 
 ### Events
 
@@ -147,11 +150,11 @@ body** link. **Full Event Log** shows the 50 newest events with their deliveries
 and every attempt. **Failed** and **Pending** narrow it to events with a failed
 delivery, or with one still pending or retrying.
 
-**Replay** sits beside each finished delivery. It creates a new delivery of the
-same event to the same target, with the target's settings as they stand now.
-**Resubmit** sits beside each event. It stores a copy of the event as a new
-event and delivers it to every target that is active now. Both actions are
-limited to 30 per minute per client.
+A finished delivery has a **Replay** button while its target exists. **Replay**
+creates a new delivery of the same event to the same target, with the target's
+settings as they stand now. **Resubmit** sits beside each event. It stores a
+copy of the event as a new event and delivers it to every target that is active
+now. Both actions are limited to 30 per minute per client.
 
 ### Profile and settings
 
@@ -177,7 +180,8 @@ its published port.
 The app runs as user `webhooker`. The image's start-up script is
 `deploy/docker-entrypoint.sh`. It gives `DATA_DIR` and its contents to that user
 before the app starts. So a host directory can be mounted as it is. webhooker
-creates every SQLite file with mode `0600`.
+creates every SQLite file readable and writable by that user alone (mode
+`0600`).
 
 ### Running under upaas
 
@@ -192,9 +196,10 @@ Read it with `docker logs` and the name upaas gave the container.
 
 webhooker speaks plain HTTP. It does not handle TLS, the encryption behind
 HTTPS: it holds no certificate and accepts no HTTPS connections. The reverse
-proxy holds the certificate and reaches webhooker over a private address. On a
-bare host that is loopback, the address only this host can reach. For the image
-it is the Docker bridge, the private network Docker puts containers on.
+proxy holds the certificate and reaches webhooker over a private address. A bare
+host is a host without Docker. On a bare host the private address is loopback
+(`127.0.0.1`), which only this host can reach. For the image it is the Docker
+bridge, the private network Docker puts containers on.
 
 Four things must be right.
 
@@ -264,10 +269,11 @@ the server does and refuses while a running instance holds it.
 DATA_DIR=/var/lib/webhooker webhooker resetpw -generate admin
 ```
 
-Without `-generate`, the new password is read from standard input. It must be at
-least 8 characters. It is never taken as a command-line argument, because other
-accounts on the host can read those. The command creates nothing: a missing
-`DATA_DIR`, a missing `webhooker.db` or an unknown username is an error.
+`-generate` makes up a random password and prints it. Without `-generate`, the
+new password is read from standard input. It must be at least 8 bytes long. It
+is never taken as a command-line argument, because other accounts on the host
+can read those. The command creates nothing: a missing `DATA_DIR`, a missing
+`webhooker.db` or an unknown username is an error.
 
 In a container, run the binary at `/app/webhooker` with the stopped container's
 volume mounted:
@@ -281,8 +287,9 @@ docker run --rm -v /path/to/data:/var/lib/webhooker \
 
 All state lives in `DATA_DIR`. Back up the whole directory. It holds:
 
-- the main database, `webhooker.db`: the session key, the `admin` account's
-  password hash, and the webhooks, entrypoints and targets;
+- the main database, `webhooker.db`: the session key (which signs the session
+  cookies), the `admin` account's password hash, and the webhooks, entrypoints
+  and targets;
 - one event database per webhook, `events-{webhook_uuid}.db`: its events,
   deliveries and attempts;
 - the files of each archive target;
@@ -352,9 +359,8 @@ writes it. The reverse proxy's access log does hold it, in the request path.
       file's type;
     - `X-Frame-Options: DENY`, which stops other sites showing these pages in a
       frame;
-    - a Content-Security-Policy (CSP), the header that tells the browser where
-      scripts and styles may come from, set to
-      `default-src 'self'; script-src 'self'; style-src 'self'`;
+    - `Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self'`,
+      which tells the browser where scripts and styles may come from;
     - `Referrer-Policy: strict-origin-when-cross-origin`, which tells another
       site only which site a visitor came from, not which page;
     - `Permissions-Policy: camera=(), microphone=(), geolocation=()`, which
@@ -364,13 +370,13 @@ writes it. The reverse proxy's access log does hold it, in the request path.
 
 ### Sign-in limits
 
-The password is checked first, and only a failed sign-in is counted. A correct
-password is never answered `429`. Failures are counted per client and submitted
-username. From the fifth failure within a minute, each failure is answered
-`429`. At most two password checks run at once; a request that gets no turn
-within 5 seconds is answered `503`. So guessing speed is bounded by the limit of
-two checks at a time, not by the failure count. Choose a long random admin
-password, or rate-limit `POST /pages/login` at the reverse proxy.
+From the fifth failure within a minute, each failure is answered `429`. Only
+failures are counted. A correct password is never answered `429`. Failures are
+counted per client and submitted username. At most two password checks run at
+once; a request that gets no turn within 5 seconds is answered `503`. So
+guessing speed is bounded by the limit of two checks at a time, not by the
+failure count. Choose a long random `admin` password, or rate-limit
+`POST /pages/login` at the reverse proxy.
 
 ### Delivery destinations
 
@@ -426,10 +432,11 @@ sends them on in the background, and SQLite holds everything in between.
 
 The receiver stores the event and one pending delivery per active target in one
 database write, then queues the deliveries. Background workers run them and
-record each attempt. At start, a recovery routine queues again every delivery
-left `pending` or `retrying`. It then runs every minute. Each run sends again a
-`retrying` delivery the engine is not working on, and a `pending` one that has
-sat untouched for 15 minutes. So a stop or a crash loses no delivery.
+record each attempt. At start, a recovery routine resumes every delivery left
+`pending` or `retrying`. It then runs every minute. Each run resumes every
+`retrying` delivery that the engine is not already handling. It also resumes a
+`pending` delivery that has sat untouched for 15 minutes. So a stop or a crash
+loses no delivery.
 
 The main database holds configuration. Each webhook has its own event database,
 so writes for one webhook never wait on another webhook's database. The program
@@ -450,18 +457,20 @@ number with a unit, such as `30s`, `15m` or `24h`.
 ### `WEBHOOKER_ENVIRONMENT`
 
 `dev` or `prod`. Default `prod`. This controls one thing: CORS, the headers that
-let a page on another site call this one from a browser. In `dev`, every origin
-is allowed. In `prod`, no CORS headers are sent.
+let a page on another site call this one from a browser. An origin is a site as
+a browser names it: scheme, host and port. In `dev`, every origin is allowed. In
+`prod`, no CORS headers are sent.
 
 ### `PORT`
 
-The port the listener binds. Default `8080`. Docker marks the image's container
-healthy by a check every 30 seconds. The check requests port `8080` whatever
-`PORT` says, so a container started with another `PORT` reports unhealthy.
+The port webhooker listens on. Default `8080`. Docker marks the image's
+container healthy by a check every 30 seconds. The check requests port `8080`
+whatever `PORT` says, so a container started with another `PORT` reports
+unhealthy.
 
 ### `BIND_ADDRESS`
 
-The IP address the listener binds. Default `127.0.0.1`. The Docker image sets
+The IP address webhooker listens on. Default `127.0.0.1`. The Docker image sets
 `0.0.0.0`. It must be an IP address literal: `localhost` and a value with a port
 are refused. `0.0.0.0` listens on IPv4 only; `::` listens on IPv6 and IPv4.
 
@@ -480,7 +489,7 @@ directory and the lock file.
 
 `true` or `false`. Default `false`. It accepts the spellings Go's
 `strconv.ParseBool` accepts; `yes` and `on` are refused. `DEBUG=true` lowers the
-log level to `DEBUG`, which adds every SQL statement, with `?` in place of each
+log level to `DEBUG`, which adds SQL statements, with `?` in place of each
 value, and other diagnostic lines.
 
 ### `METRICS_USERNAME` and `METRICS_PASSWORD`
@@ -530,10 +539,10 @@ private ranges. A set value replaces the default.
 The list decides whose `X-Forwarded-For` header is believed. `X-Forwarded-For`
 is the header a proxy uses to pass on the address of the client it is serving.
 It is read only when the connecting machine is inside the list. webhooker never
-reads `X-Real-IP` or `True-Client-IP`, two other headers with the same job. If
-any client can reach webhooker, or the proxy in front of it, from a private
-address, set the list to the proxy's address alone. Otherwise those clients can
-choose their own `X-Forwarded-For` and bypass every rate limit.
+reads `X-Real-IP` or `True-Client-IP`, two other headers with the same job. Some
+clients may reach webhooker, or the proxy in front of it, from a private
+address. If so, set the list to the proxy's address alone. Otherwise those
+clients can choose their own `X-Forwarded-For` and bypass every rate limit.
 
 ### Allowing egress to your own network
 
@@ -542,9 +551,9 @@ that delivery targets may reach although the SSRF guard refuses them by default.
 Default empty. Example: `10.0.0.0/8, 172.17.0.0/16`. When the list is set,
 startup logs it at `WARN`.
 
-Anyone with the admin account can make webhooker send requests to every network
-you list, and read the responses in **Full Event Log**. List the smallest blocks
-that cover your destinations, and never `0.0.0.0/0` or `::/0`.
+Anyone with the `admin` account can make webhooker send requests to every
+network you list, and read the responses in **Full Event Log**. List the
+smallest networks that cover your destinations, and never `0.0.0.0/0` or `::/0`.
 
 These addresses stay blocked whatever you list. They are link-local space, the
 unspecified addresses and cloud metadata endpoints. The unspecified addresses
@@ -563,9 +572,9 @@ addresses are:
 - `0.0.0.0/32` and `::/128`;
 - `::a9fe:a9fe/128` and `64:ff9b::a9fe:a9fe/128`.
 
-This list is not every cloud's metadata address. If yours is not here, do not
-list the block that contains it. Azure's public `168.63.129.16` is refused by
-default but is reopened by a list that covers it.
+Some clouds' metadata addresses are not on this list. If yours is not here, do
+not list the network that contains it. Azure's public metadata address,
+`168.63.129.16`, is refused by default but is reopened by a list that covers it.
 
 ## Delivery reference
 
@@ -574,7 +583,7 @@ event's `Content-Type` and headers. The target's configured **Headers** are
 added next and replace event headers of the same name. Every `http` and `slack`
 request carries `User-Agent: webhooker/{version}`. `User-Agent` is the header
 that names the sending program. The **Headers** field refuses `User-Agent`. A
-response with a status from 200 to 299 is a success. The first 4 KiB of the
+response with a status from `200` to `299` is a success. The first 4 KiB of the
 response body is stored with the attempt. **Timeout** is at most 300 seconds,
 and blank means the 30 second default. **Pass the query string on to this
 target** appends the event's query string to the URL.
@@ -615,6 +624,8 @@ one JSON file compressed with gzip.
     - an unknown UUID gets `404`;
     - a deactivated entrypoint gets `410`;
     - a body over 1 MB gets `413`;
+    - a body that cannot be read in full gets `400`, for example one still
+      arriving after the server's 10 second read limit;
     - a failure to store the event gets `500`;
     - a stored event gets `200` with `{"status":"ok"}`.
 - `GET /pages/login` shows the sign-in form, `POST /pages/login` signs in, and
@@ -678,15 +689,16 @@ checkout, or `VERSION` when that is set. It is shown at
 
 The pages use one third-party script, Alpine.js. They load `@alpinejs/csp`, the
 version of it that works when the Content-Security-Policy forbids running text
-as code. The npm registry is where JavaScript packages are published. The
-package file in `3p/` is byte for byte the one the npm registry publishes.
+as code. The npm registry is where JavaScript packages are published.
+`static/js/alpine.min.js` is committed byte for byte as the npm registry
+publishes it.
 
-A browser test in `internal/server` loads the pages in a headless browser, one
-without a window, under the real Content-Security-Policy. `make test` leaves it
-out; run `make test-browser` after changing `templates/` or `static/js/`.
-`static/css/tailwind.css` is generated by Tailwind, a CSS generator, and
-committed; `make check` fails when it is out of date, and `make css` regenerates
-it.
+A headless browser is a browser without a window. A browser test in
+`internal/server` loads the pages in one under the real Content-Security-Policy.
+`make test` leaves it out; run `make test-browser` after changing `templates/`
+or `static/js/`. `static/css/tailwind.css` is generated by Tailwind, a CSS
+generator. The file is committed. `make check` fails when it is out of date, and
+`make css` regenerates it.
 
 ## Entrypoints
 
@@ -699,7 +711,6 @@ application are under [Entrypoint URLs](#entrypoint-urls).
 - `script/bootstrap` installs git, make, Go and the Go modules.
 - `script/setup` runs `script/bootstrap`, then `script/install-precommit`.
 - `script/projectname` prints `webhooker`.
-- `script/assets` extracts Alpine.js from `3p/` to `static/js/alpine.min.js`.
 - `script/test` runs the tests in Docker.
 - `script/test-browser` runs the browser test in Docker.
 - `script/lint` runs `gofmt`, `golangci-lint` and ESLint in Docker.

TODO.md

@@ -1,72 +1,77 @@
 # Workflow
 
-One issue per unit of work, one branch and one PR per issue:
+One issue per unit of work, and one branch and one PR per issue:
 
-- ensure a tracked issue exists with a definition of done
-- branch from `next` (never from `main`)
-- do the work; open a PR based on `next` (never on `main`)
-- pass an independent review, then the manager squash-merges into `next`
-- push; nothing stays local-only
+- make sure a tracked issue exists with a definition of done
+- branch from `next`, never from `main`
+- do the work and push the branch
+- open a PR with base `next`, never `main`
+- pass an independent review
+- the repository manager squash-merges it into `next`
 
-`next` is the branch for the next milestone and must stay green and mergeable to
-`main` without notice. One `next` -> `main` PR accumulates the milestone;
-releases are cut from `main` separately.
+The repository manager is the role that merges each issue's PR into `next`.
+Nothing stays local-only: every commit is pushed.
 
-The tracker (https://git.eeqj.de/sneak/webhooker/issues) is the record of what
-is done and what is under way. This file keeps no list of either.
+`next` is the branch for the next milestone. It must stay green and mergeable
+into `main` at all times. A milestone's work reaches `main` through one PR from
+`next`. The owner, @sneak, merges that PR. Cutting a release from `main` is a
+separate step after that.
+
+The tracker (https://git.eeqj.de/sneak/webhooker/issues) records what is done
+and what is under way. This file keeps no list of either.
 
 # Status
 
 What is still open for 1.0.0 is in its milestone
-(https://git.eeqj.de/sneak/webhooker/milestone/9). `v1.0.0` is not tagged, and
-only @sneak tags it.
+(https://git.eeqj.de/sneak/webhooker/milestone/9). `v1.0.0` is not tagged. Only
+@sneak tags it.
 
-Delivery is at-least-once by design, not by accident: a send whose result row
-does not land is attempted again, so a receiver can see a duplicate. That is
-deliberate — the alternative is a silent lost delivery — and the README says so
-under Rationale. It is not a defect to re-file.
+Delivery is at least once by design. When webhooker cannot record the outcome of
+a delivery, it sends that delivery again. The target can then receive the same
+event twice. The alternative is a lost delivery that nothing reports. The README
+says so. Such a duplicate is not a defect to re-file.
 
 # Next Step
 
 @sneak runs webhooker in limited production, then tags `v1.0.0`. Merging `next`
-into `main` is a separate act from tagging and waits on neither of those: `next`
-is kept mergeable at all times, which is the point of the branch.
+into `main` is a separate act. It waits on neither the production run nor the
+tag.
 
 # Future Steps
 
-- Per-webhook rate limits, set in the web UI and enforced in the receiver
-  handler, on top of the receiver's existing limits, which `RECEIVER_RATE_LIMIT`
-  sets for the whole server (see Rate Limiting in the README)
-- API key authentication for programmatic access (the `APIKey` model exists, but
-  nothing creates a key and no middleware checks one)
-- REST API v1
-    - CRUD for webhooks, entrypoints, targets
+- Per-webhook rate limits, set in the web UI and enforced at the entrypoint.
+  Today `RECEIVER_RATE_LIMIT` is the only rate-limit setting. It is how many
+  requests per minute one client address may send to one entrypoint. The same
+  address is also capped at ten times that across all entrypoints together.
+- API key authentication for programmatic access. The `APIKey` model and its
+  `api_keys` table exist. Nothing creates a key and nothing checks one.
+- REST API v1. `/api/v1` is mounted with no routes today.
+    - CRUD for webhooks, entrypoints and targets
     - event viewing and filtering endpoints
     - event redelivery endpoint
     - OpenAPI specification
 - Analytics in the web UI: response times summarised per webhook or per target,
-  and figures for all webhooks together. The webhook page already shows event,
-  delivery and failure counts and failure percentages, the target list counts
-  each target's deliveries, the event log and each event's page show every
-  attempt's duration, and `/metrics` carries server-wide counts and delivery
-  durations
-- A remember-me option at login. Every session already survives a browser
-  restart: it lasts up to 7 days, and ends sooner after `SESSION_IDLE_TIMEOUT`
-  (default 24 hours) without activity
-- Password reset flow for a forgotten password over the web. The authenticated
-  password _change_ flow already landed, and a lost password is recoverable from
-  the console with `webhooker resetpw`
-  (https://git.eeqj.de/sneak/webhooker/issues/208)
+  and figures for all webhooks together. Today the webhook page shows event,
+  delivery and failure counts and failure percentages. The target list counts
+  each target's deliveries. The event log shows every attempt's duration.
+  `/metrics` carries server-wide counts and delivery durations.
+- A remember-me option at login. Today every session survives a browser restart.
+  It lasts up to 7 days. It ends sooner after `SESSION_IDLE_TIMEOUT` (default 24
+  hours) without use.
+- Password reset over the web for a forgotten password. Today a signed-in user
+  can change their password. A lost password is reset from the command line with
+  `webhooker resetpw` (https://git.eeqj.de/sneak/webhooker/issues/208).
 - Later, nice to have
     - email delivery target type
     - SNS and S3 delivery targets
-    - data transformations (e.g. a configurable Slack message format; the Slack
-      target sends one fixed format today)
-    - JSONL file delivery with periodic S3 upload (the `database` target already
-      archives events to SQLite files, rotated hourly, daily or monthly if set,
-      and the webhook page offers them as one gzipped JSON download)
+    - data transformations, such as a configurable Slack message format. The
+      Slack target sends one fixed format today.
+    - JSONL file delivery with periodic S3 upload. Today an archive target
+      writes events to SQLite files. An archive target can rotate those files
+      hourly, daily or monthly. The webhook page offers them as one gzipped JSON
+      download.
     - webhook event search, and filtering beyond the event log's failed and
       pending views
-    - multi-user with role-based access control (each webhook already belongs to
-      one account, but there is only the account made at first boot and no way
-      to add another)
+    - multi-user with role-based access control. Today each webhook belongs to
+      one account. Only the account made at first boot exists. There is no way
+      to add another.

eslint.config.mjs

@@ -5,7 +5,7 @@
 // REPO_POLICIES.md states that a linter can check: const for everything,
 // let only for a variable that is reassigned, never var.
 export default [
-    // Alpine.js, extracted from 3p/ by make assets; not ours to lint.
+    // Alpine.js, committed as published; not ours to lint.
     { ignores: ["static/js/alpine.min.js"] },
     {
         // The pages load static/js/app.js as a classic script, not a module.

internal/handlers/export_test.go

@@ -96,6 +96,12 @@ func (s *Handlers) WebhookStatsForTest(webhookID string) *WebhookStats {
 	return s.loadWebhookStats(webhookID, entrypoints, targets)
 }
 
+// RelativeTimeForTest exposes relativeTime for use in the
+// handlers_test package.
+func RelativeTimeForTest(at, now time.Time) string {
+	return relativeTime(at, now)
+}
+
 // FinishedByTargetForTest exposes finishedByTarget for use in the
 // handlers_test package.
 func FinishedByTargetForTest(

internal/handlers/webhook_stats.go

@@ -15,6 +15,9 @@ const (
 	longWindow  = 24 * time.Hour
 )
 
+// day is the largest unit relativeTime writes.
+const day = 24 * time.Hour
+
 // percent turns a fraction into a percentage.
 const percent = 100
 
@@ -35,8 +38,12 @@ type WebhookStats struct {
 	InProgress int64
 
 	// LastEventAt is when the newest event arrived, or nil when none
-	// has. Retention does not change it.
-	LastEventAt *time.Time
+	// has. Retention does not change it. LastEvent is how long ago
+	// that was, as relativeTime writes it, and LastEventUTC the full
+	// time; both are empty when no event has arrived.
+	LastEventAt  *time.Time
+	LastEvent    string
+	LastEventUTC string
 
 	Last10Minutes RecentWindow
 	Last24Hours   RecentWindow
@@ -81,6 +88,42 @@ func (w RecentWindow) FailurePercent() string {
 	)
 }
 
+// relativeTime is how long before now the time at was, in whole
+// seconds, written as its two largest units out of d, h, m and s:
+// "59s", "1m1s", "23h59m", "3d4h". A second unit of zero is left off,
+// as in "5m". A time after now is "0s".
+func relativeTime(at, now time.Time) string {
+	elapsed := max(now.Sub(at), 0)
+
+	days := int64(elapsed / day)
+	hours := int64(elapsed % day / time.Hour)
+	minutes := int64(elapsed % time.Hour / time.Minute)
+	seconds := int64(elapsed % time.Minute / time.Second)
+
+	switch {
+	case days > 0:
+		return twoUnits(days, "d", hours, "h")
+	case hours > 0:
+		return twoUnits(hours, "h", minutes, "m")
+	case minutes > 0:
+		return twoUnits(minutes, "m", seconds, "s")
+	default:
+		return fmt.Sprintf("%ds", seconds)
+	}
+}
+
+// twoUnits writes a count of a larger unit followed by a count of the
+// next smaller one, leaving the smaller off when it is zero.
+func twoUnits(
+	larger int64, largerUnit string, smaller int64, smallerUnit string,
+) string {
+	if smaller == 0 {
+		return fmt.Sprintf("%d%s", larger, largerUnit)
+	}
+
+	return fmt.Sprintf("%d%s%d%s", larger, largerUnit, smaller, smallerUnit)
+}
+
 // loadWebhookStats gathers the figures for the statistics pane from the
 // webhook's entrypoints and targets, as the page has already loaded
 // them, and from its event database. It returns nil, and logs why, when
@@ -139,7 +182,7 @@ func (h *Handlers) loadWebhookStats(
 func readEventStats(
 	db *gorm.DB, now time.Time, stats *WebhookStats,
 ) error {
-	err := readTotals(db, stats)
+	err := readTotals(db, now, stats)
 	if err != nil {
 		return err
 	}
@@ -169,9 +212,9 @@ func readEventStats(
 }
 
 // readTotals fills in the lifetime and within-retention figures, and
-// when the last event arrived, from the running totals: the events'
-// row, and the targets' rows summed.
-func readTotals(db *gorm.DB, stats *WebhookStats) error {
+// when the last event arrived and how long before now that was, from
+// the running totals: the events' row, and the targets' rows summed.
+func readTotals(db *gorm.DB, now time.Time, stats *WebhookStats) error {
 	var events database.EventTotals
 
 	err := db.Take(&events).Error
@@ -190,6 +233,12 @@ func readTotals(db *gorm.DB, stats *WebhookStats) error {
 	stats.WithinRetention.Events = events.Events - events.EventsRemoved
 	stats.LastEventAt = events.LastEventAt
 
+	if events.LastEventAt != nil {
+		stats.LastEvent = relativeTime(*events.LastEventAt, now)
+		stats.LastEventUTC =
+			events.LastEventAt.UTC().Format(time.DateTime) + " UTC"
+	}
+
 	for _, t := range targets {
 		stats.Lifetime.Deliveries += t.Deliveries
 		stats.Lifetime.Failures += t.Failed

internal/handlers/webhook_stats_test.go

@@ -265,6 +265,13 @@ func statsPane(t *testing.T, page string) string {
 	return strings.Join(strings.Fields(pane), " ")
 }
 
+// statsLastEventShown matches the pane's last event for an event that
+// arrived at at: a figure with the full time in UTC as its tooltip.
+func statsLastEventShown(at time.Time) string {
+	return `Last event</span>\s*<span [^>]*title="` +
+		at.UTC().Format(time.DateTime) + ` UTC">[^<]+</span>`
+}
+
 // assertStatsTargets checks, for the history seedStatsHistory builds,
 // each target's totals and its deliveries finished in the last 24
 // hours. The first target has ten deliveries and the replay, the
@@ -300,14 +307,17 @@ func assertStatsPaneAfterPrune(
 ) {
 	t.Helper()
 
-	pane := statsPane(t, renderSourceDetailPage(t, h, sess, hist.webhook.ID))
-	lastEvent := hist.newest.CreatedAt.UTC().Format("2006-01-02 15:04:05 UTC")
+	page := renderSourceDetailPage(t, h, sess, hist.webhook.ID)
+	pane := statsPane(t, page)
 
-	assert.Contains(t, pane, "Entrypoints 12 (11 active) "+
-		"Targets 6 (2 active) "+
-		"Deliveries in progress 13 "+
-		"Last event "+lastEvent+" "+
-		"Retention 14 days")
+	// The newest event arrived moments ago, so the last event is a
+	// few seconds ago.
+	assert.Regexp(t, `Entrypoints 12 \(11 active\) `+
+		`Targets 6 \(2 active\) `+
+		`Deliveries in progress 13 `+
+		`Last event \d+s `+
+		`Retention 14 days`, pane)
+	assert.Regexp(t, statsLastEventShown(hist.newest.CreatedAt), page)
 	assert.Contains(t, pane, "Lifetime Within retention "+
 		"Events 10 9 "+
 		"Deliveries 21 18 "+
@@ -440,15 +450,14 @@ func TestWebhookStats_LastEventSurvivesPruningEveryEvent(t *testing.T) {
 	require.NotNil(t, stats.LastEventAt)
 	assert.True(t, arrived.Equal(*stats.LastEventAt))
 
-	pane := statsPane(t, renderSourceDetailPage(t, h, sess, wh.ID))
-	assert.Contains(t, pane,
-		"Last event "+arrived.UTC().Format("2006-01-02 15:04:05 UTC"))
+	assert.Regexp(t, statsLastEventShown(arrived),
+		renderSourceDetailPage(t, h, sess, wh.ID))
 }
 
-// TestWebhookStats_LastEventInUTC checks that the pane shows when the
-// last event arrived in UTC, as the event list does, when the time was
-// stored in another zone, as it is on a host whose local time is not
-// UTC.
+// TestWebhookStats_LastEventInUTC checks that the tooltip of the pane's
+// last event gives the time in UTC, as the event list does, when the
+// time was stored in another zone, as it is on a host whose local time
+// is not UTC.
 func TestWebhookStats_LastEventInUTC(t *testing.T) {
 	t.Parallel()
 
@@ -474,8 +483,9 @@ func TestWebhookStats_LastEventInUTC(t *testing.T) {
 	require.NoError(t, database.AddEventTotals(webhookDB,
 		database.EventTotals{Events: 1, LastEventAt: &arrived}))
 
-	pane := statsPane(t, renderSourceDetailPage(t, h, sess, wh.ID))
-	assert.Contains(t, pane, "Last event 2026-03-05 03:30:00 UTC")
+	assert.Regexp(t,
+		`Last event</span>\s*<span [^>]*title="2026-03-05 03:30:00 UTC">`,
+		renderSourceDetailPage(t, h, sess, wh.ID))
 }
 
 // TestWebhookStats_PaneShowsRetentionPeriod checks that the statistics
@@ -541,8 +551,11 @@ func TestWebhookStats_WebhookWithNoEvents(t *testing.T) {
 	assert.Equal(t, &handlers.WebhookStats{}, h.WebhookStatsForTest(wh.ID))
 	assert.Equal(t, "—", handlers.RecentWindow{}.FailurePercent())
 
-	pane := statsPane(t, renderSourceDetailPage(t, h, sess, wh.ID))
+	page := renderSourceDetailPage(t, h, sess, wh.ID)
+	pane := statsPane(t, page)
 	assert.Contains(t, pane, "Last event none")
+	assert.Regexp(t, `Last event</span>\s*<span class="[^"]*">none</span>`,
+		page, "a last event of none has a tooltip")
 	assert.Contains(t, pane, "Failure percentage — —")
 	assert.False(t, dbMgr.DBExists(wh.ID))
 }
@@ -567,3 +580,35 @@ func TestRecentWindow_FailurePercent(t *testing.T) {
 		assert.Equal(t, tt.want, tt.window.FailurePercent(), tt.window)
 	}
 }
+
+// TestRelativeTime pins how the pane writes the time since the last
+// event, at each boundary between its units.
+func TestRelativeTime(t *testing.T) {
+	t.Parallel()
+
+	now := time.Date(2026, time.October, 26, 12, 0, 0, 0, time.UTC)
+
+	tests := []struct {
+		ago  time.Duration
+		want string
+	}{
+		{0, "0s"},
+		{59900 * time.Millisecond, "59s"},
+		{60 * time.Second, "1m"},
+		{61 * time.Second, "1m1s"},
+		{3599 * time.Second, "59m59s"},
+		{3600 * time.Second, "1h"},
+		{3660 * time.Second, "1h1m"},
+		{86399 * time.Second, "23h59m"},
+		{86400 * time.Second, "1d"},
+		{90000 * time.Second, "1d1h"},
+		{400*24*time.Hour + 3*time.Hour, "400d3h"},
+		// An event time ahead of the server clock.
+		{-time.Hour, "0s"},
+	}
+
+	for _, tt := range tests {
+		assert.Equal(t, tt.want,
+			handlers.RelativeTimeForTest(now.Add(-tt.ago), now), tt.ago)
+	}
+}

internal/server/alpine_browser_test.go

@@ -61,7 +61,8 @@ const (
 // event log in a headless browser, served by the real router and so
 // under the real Content-Security-Policy, and checks that the pages'
 // Alpine.js directives, the copy control and the delete prompts work,
-// and that a target's row shows its delivery counts.
+// that a target's row shows its delivery counts, and that the
+// Statistics block shows how long ago the last event arrived.
 func TestAlpineRunsUnderTheSecurityPolicy(t *testing.T) {
 	t.Parallel()
 
@@ -97,6 +98,7 @@ func TestAlpineRunsUnderTheSecurityPolicy(t *testing.T) {
 	checkCopy(ctx, t, page)
 	checkEntrypointEdit(ctx, t, page, page+"/events")
 	checkRecentEvents(ctx, t, page)
+	checkStatsLastEvent(ctx, t, env, webhook.ID, page)
 	checkArchiveChoice(ctx, t, srv.URL+"/hooks/new", page)
 	checkNewWebhookTargets(ctx, t, env, srv.URL+"/hooks/new")
 	checkRefusedNewWebhook(ctx, t, srv.URL+"/hooks/new")
@@ -831,6 +833,41 @@ func checkRecentEvents(ctx context.Context, t *testing.T, url string) {
 		"the event's own page does not show its body")
 }
 
+// checkStatsLastEvent records that the last event of the webhook
+// webhookID arrived 3 days, 4 hours and 30 minutes ago, loads its page,
+// and checks that the Statistics block shows the last event as "3d4h"
+// with the full time in UTC as its tooltip.
+func checkStatsLastEvent(
+	ctx context.Context, t *testing.T, env *testEnv, webhookID, url string,
+) {
+	t.Helper()
+
+	webhookDB, err := env.dbMgr.GetDB(webhookID)
+	require.NoError(t, err)
+
+	ago := 3*24*time.Hour + 4*time.Hour + 30*time.Minute
+	arrived := time.Now().Add(-ago)
+	require.NoError(t, database.AddEventTotals(webhookDB,
+		database.EventTotals{LastEventAt: &arrived}))
+
+	figure := `//span[text()="Last event"]` +
+		`/following-sibling::span[text()="3d4h"]`
+
+	var (
+		title string
+		found bool
+	)
+
+	require.NoError(t, chromedp.Run(ctx, loadPage(url)))
+	require.True(t, shown(ctx, figure),
+		`the Statistics block does not show the last event as "3d4h"`)
+	require.NoError(t, chromedp.Run(ctx, chromedp.AttributeValue(
+		figure, "title", &title, &found, chromedp.BySearch,
+	)))
+	assert.Equal(t, arrived.UTC().Format(time.DateTime)+" UTC", title,
+		"the last event's tooltip is not the full time in UTC")
+}
+
 // checkEventLog loads the event log and checks that of its events only
 // the newest, eventID, starts expanded: its row says so and its caret is
 // turned up, and the log's last event, lastEventID, starts collapsed. In

internal/server/static_assets_test.go

@@ -13,9 +13,6 @@ import (
 
 // TestBaseTemplateScriptsAreServed walks every /s/ script the base
 // template loads on each page and fetches it through the real router.
-// Alpine.js is extracted from its tarball in 3p/ at build time, so the
-// file is not in the tree: this is the check that the page still gets
-// the JavaScript it asks for.
 func TestBaseTemplateScriptsAreServed(t *testing.T) {
 	t.Parallel()
 

script/assets

@@ -1,17 +0,0 @@
-#!/bin/sh
-# script/assets: extract Alpine.js from its npm package tarball, committed
-# in 3p/, to static/js/alpine.min.js, where go:embed reads it. The package
-# is @alpinejs/csp, Alpine's build for pages whose Content-Security-Policy
-# forbids eval. The extracted file is not committed. make build, make dev
-# and the Dockerfile's lint, test and build stages run this first.
-set -eu
-
-ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
-
-main() {
-    cd "$ROOT"
-    tar -xzOf 3p/alpinejs-csp-3.14.9.tgz package/dist/cdn.min.js \
-        >static/js/alpine.min.js
-}
-
-main "$@"

static/static.go

@@ -6,9 +6,11 @@ import (
 )
 
 // Static holds the CSS and JavaScript files the web UI's pages load. They
-// are named one by one so that a missing js/alpine.min.js, which make
-// assets extracts and git does not track, fails the build instead of
-// leaving the pages without Alpine.js.
+// are named one by one, so a missing file fails the build instead of
+// leaving the pages without it.
+//
+// js/alpine.min.js is Alpine.js, committed unchanged. It is
+// package/dist/cdn.min.js from the npm package @alpinejs/csp 3.14.9.
 //
 //go:embed css/tailwind.css css/style.css js/app.js js/alpine.min.js
 var Static embed.FS

templates/webhook_stats.html

@@ -22,7 +22,11 @@
         </div>
         <div>
             <span class="text-gray-500">Last event</span>
-            <span class="font-medium text-gray-900">{{with .LastEventAt}}{{.UTC.Format "2006-01-02 15:04:05 UTC"}}{{else}}none{{end}}</span>
+            {{if .LastEvent}}
+            <span class="font-medium text-gray-900" title="{{.LastEventUTC}}">{{.LastEvent}}</span>
+            {{else}}
+            <span class="font-medium text-gray-900">none</span>
+            {{end}}
         </div>
         <div>
             <span class="text-gray-500">Retention</span>