Resolve PTR names over DNS-over-HTTPS and cache them for the record TTL (closes #238 )

`internal/ptr` asks Google, Cloudflare, AdGuard and Quad9 in turn, 2 seconds in all per address. It keeps answers in memory and writes them through to `cache.db`, opened by the new `internal/cachedb`. A reserved address is not sent to the resolvers. The cache holds at most 250,000 addresses. Judgement calls: - Each resolver gets an equal share of the time left, so a hung resolver does not use up the 2 seconds. - The negative TTL is the smaller of the SOA minimum and the SOA's own TTL (RFC 2308). - Names that are not host names are dropped, as `net.Resolver.LookupAddr` does. Model: opus-5-5
2026-11-10 12:13:46 +00:00
21 changed files with 52 additions and 2660 deletions
@@ -63,8 +63,8 @@ docker run --memory=5g --memory-swap=5g -p 8080:8080 \
    -v routewatch:/var/lib/berlin.sneak.app.routewatch routewatch
 ```
-The memory limit is explained in Memory. The volume holds the database, the
+The memory limit is explained in Memory. The volume holds the database and the
-copies of the IP lists and the geolocation files.
+copies of the IP lists.
 To run the binary on the host instead, build it with `make build`. The build
 needs Go and a C compiler, because the SQLite library is written in C:
@@ -287,14 +287,12 @@ address. Every entry has the same fields:
    - `is_tor`: true when the address is on the `tor_exits` list
    - `is_vpn`: true when the address is on any list of VPN servers (see IP
      lists)
    - `is_relay`: true when the address is on the `icloud_private_relay` list
    - `is_bogon`: true when the address is reserved, so that no network should
      announce it on the internet
 - `vpn_providers`: the names of the lists of VPN servers the address is on, or
  an empty list when it is on none
 - `ip_lists`: the public IP lists the address is on (see IP lists), or an empty
  list when it is on none
 - `geo`: where the address is (see Geolocation), or null when no source answers
 Every other field is about the prefix in the routing table that holds the
 address. Each is null when no prefix in the routing table holds the address:
@@ -423,9 +421,6 @@ The lists:
  last 30 days. From
  [FireHOL](https://iplists.firehol.org/?ipset=firehol_level3), downloaded every
  3 hours.
 - `icloud_private_relay`: the networks where iCloud Private Relay traffic
  leaves. From [Apple](https://mask-api.icloud.com/egress-ip-ranges.csv),
  downloaded once a day.
 - `ivpn`: VPN servers run by IVPN. From
  [IVPN](https://api.ivpn.net/v5/servers.json), downloaded once a day.
 - `mullvad`: VPN servers run by Mullvad. From
@@ -436,14 +431,6 @@ The lists:
 - `pia`: VPN servers run by Private Internet Access. From
  [Private Internet Access](https://serverlist.piaservers.net/vpninfo/servers/v6),
  downloaded once a day.
 - `protonvpn`: the /24 networks that hold ProtonVPN servers. The whole /24 is
  listed because the ProtonVPN-IPs README says traffic leaves from unpublished
  addresses in it. From the public
  [ProtonVPN-IPs](https://github.com/tn3w/ProtonVPN-IPs) mirror of Proton's
  server list, downloaded once a day.
 - `protonvpn_entry`: the IPv4 and IPv6 addresses of ProtonVPN servers. From the
  same [ProtonVPN-IPs](https://github.com/tn3w/ProtonVPN-IPs) mirror, downloaded
  once a day.
 - `spamhaus_drop` and `spamhaus_dropv6`: IPv4 and IPv6 networks hijacked or
  leased by spammers or cyber criminals, according to Spamhaus. From
  [Spamhaus DROP](https://www.spamhaus.org/blocklists/do-not-route-or-peer/),
@@ -514,72 +501,6 @@ How RouteWatch keeps the answers:
 - It keeps answers for at most 250,000 addresses, and keeps no answer for a new
  address while it holds that many.
 ## Geolocation
 An IP lookup finds where each address is, on a best-effort basis. It uses two
 sources:
 - [geojs](https://www.geojs.io/) is asked first. One request carries every
  address of the lookup, and it has 1 second to answer.
 - [DB-IP City Lite](https://db-ip.com/db/download/ip-to-city-lite) answers when
  geojs has no answer for the address. It is a database file that RouteWatch
  reads itself.
 geojs has no answer when its request fails or runs out of time. An answer with
 no country, city or coordinates also counts as no answer, and RouteWatch does
 not cache it.
 The `geo` object of a result has these fields:
 - `country_code`: the two-letter country code
 - `country`: the country's name in English
 - `continent_code`: the two-letter continent code
 - `region`: the region or state
 - `city`: the city
 - `latitude` and `longitude`: the location in degrees
 - `accuracy_radius_km`: how far from that location the address may be, in km
 - `time_zone`: the time zone's name, such as `Europe/Berlin`
 - `source`: the source of the answer, `geojs` or `dbip`
 - `updated`: when the answer was fetched from geojs, or when the database copy
  was downloaded
 A field the source does not know is null. DB-IP has no `accuracy_radius_km` and
 no `time_zone`, so both are null in its answers. `geo` itself is null when
 neither source answers. A reserved address, one whose `is_bogon` flag is true,
 goes to neither source, so its `geo` is null.
 What goes outside: geojs receives each address that the cache does not hold. For
 `/ip/` and the home page, that address is the visitor's own. A lookup answered
 from the cache sends nothing. DB-IP receives only the monthly request for its
 file.
 How RouteWatch keeps the answers of geojs:
 - It holds at most 250,000 addresses in memory, and drops the least recently
  used first. That takes about 100 MB of the Go heap.
 - It writes new answers every 5 seconds to `cache.db` in the state directory.
 - It loads the newest 250,000 answers from `cache.db` at startup.
 - An address not in memory is read from `cache.db` before geojs is asked.
 - An answer expires 7 days after its fetch. Every 10 minutes RouteWatch deletes
  expired answers from memory and from `cache.db`.
 Answers from the database are not cached, because reading the file is local.
 How RouteWatch keeps the database:
 - It keeps one copy in the state directory, named `dbip-city-lite.mmdb`.
 - It downloads the current month's file at the first start, and then once a
  month. Until the first download finishes, only geojs answers.
 - A download fails when it takes over 10 minutes or unpacks to over 200 MiB.
 - A new file replaces the old copy only once it opens. After a failed download
  RouteWatch keeps the old copy and tries again an hour later.
 - The file is about 130 MB. RouteWatch maps it into memory, outside the Go heap.
  The kernel loads the parts that are read, and can drop them again when memory
  is short.
 The home page's footer says "IP Geolocation by DB-IP" with a link to
 [db-ip.com](https://db-ip.com).
 ## Configuration
 RouteWatch reads its settings from environment variables. It takes no
@@ -631,9 +552,7 @@ are not read.
 The state directory holds:
 - `db.sqlite`: the database
- `cache.db`: the answers of PTR lookups and of geojs
+- `cache.db`: the answers of PTR lookups
 - `dbip-city-lite.mmdb`: the copy of DB-IP's City Lite database (see
  Geolocation)
 - `iplists`: the IP list copies
 It is at:
@@ -658,9 +577,8 @@ a memory limit of 5 GiB and swap disabled:
 docker run --memory=5g --memory-swap=5g ...
 ```
-The 5 GiB leaves room above the ceilings for spikes, for the kernel's cache of
+The 5 GiB leaves room above the ceilings for spikes and for the kernel's cache
-the database file, and for the mapped copy of DB-IP's database (see
+of the database file.
 Geolocation).
 The ceilings add up to 3.7 GiB:
@@ -680,13 +598,6 @@ The ceilings add up to 3.7 GiB:
  limit caps the SQLite library.
 - About 0.2 GiB for everything else in the runtime.
 The `icloud_private_relay` list has about 285,000 networks. Neighbouring
 networks merge, which leaves about 6,900 address ranges. Loaded, the list adds
 about 0.3 MiB to the Go heap and under 6 MiB to the process's resident memory.
 Parsing the file allocates about 94 MiB in about 0.2 seconds. The next garbage
 collection frees all of it but the 0.3 MiB above. Parsing happens at startup and
 whenever a download brings a new version.
 The SQLite library gets its memory from glibc, the C library. glibc keeps freed
 memory in pools called arenas, and hands it back to the kernel slowly. It
 creates up to eight arenas per processor core. So on a host with many cores the
@@ -803,8 +714,6 @@ The parts:
  address.
 - The PTR cache looks up the PTR names of addresses and keeps the answers (see
  PTR lookups).
 - The geolocation part finds where addresses are, keeps the answers of geojs and
  downloads DB-IP's database (see Geolocation).
 - The database maintainer checkpoints the database every 5 seconds: it folds the
  write-ahead log, where SQLite first writes changes, into the database file. It
  reclaims free space every 10 minutes. Every hour it refreshes the statistics
@@ -914,8 +823,7 @@ On `SIGTERM` or `SIGINT` the daemon stops its parts in this order:
 4. the database maintainer
 5. the IP list downloads
 6. the HTTP server
-7. the geolocation part, which writes the geojs answers it holds
+7. the PTR cache, which writes what it holds
 8. the PTR cache, which writes what it holds
 Last, the daemon checkpoints and closes the database. It gives all this 8
 seconds and then exits with status 0. A stop that is still running after 9
@@ -938,8 +846,6 @@ What a stop can lose:
  SQLite rolls back any write the exit cut off.
 - When the 8 seconds run out, the PTR answers not yet in `cache.db` are lost.
  RouteWatch asks the resolvers for them again the next time they are needed.
 - When the 8 seconds run out, the geojs answers not yet in `cache.db` are lost.
  RouteWatch asks geojs for them again the next time they are needed.
 ### Code layout
@@ -956,7 +862,6 @@ routewatch/
 │   ├── cachedb/            # cache.db, the caches of outside answers
 │   ├── config/             # Settings from the environment
 │   ├── database/           # SQLite storage
 │   ├── geo/                # Geolocation: geojs, DB-IP City Lite, the cache
 │   ├── iplist/             # Public IP lists: downloads and lookups
 │   ├── logger/             # Structured logging
 │   ├── metrics/            # Feed and route update figures
@@ -1009,16 +914,11 @@ announcements(id PRIMARY KEY, prefix_id, peer_asn, origin_asn, path,
 The indexes are in `internal/database/schema.sql`.
-`cache.db` is a separate file, with two tables:
+`cache.db` is a separate file, with one table:
 ```sql
 -- The answers of PTR lookups. names is empty for an address with no PTR names.
 hostnames(address PRIMARY KEY, names, expires_at)
 -- The answers of geojs. A part geojs does not know is NULL.
 geolocations(address PRIMARY KEY, country_code, country, continent_code,
             region, city, latitude, longitude, accuracy_radius_km, time_zone,
             fetched_at)
 ```
 ## Development
@@ -53,17 +53,6 @@ problem the run finds.
 # Completed Steps
 - 2026-11-10: each result of the IP lookup has `geo`, where the address is. It
  comes from geojs, with DB-IP's City Lite database as the fallback. The geojs
  answers stay in memory and in `cache.db` for 7 days (closes
  https://git.eeqj.de/sneak/routewatch/issues/239).
 - 2026-11-10: the IP lookup checks the `icloud_private_relay` list of Apple's
  iCloud Private Relay networks, downloaded once a day. Each result has
  `flags.is_relay` (closes https://git.eeqj.de/sneak/routewatch/issues/237).
 - 2026-11-10: the IP lookup checks the `protonvpn` list of ProtonVPN's /24
  networks and the `protonvpn_entry` list of its servers' IPv4 and IPv6
  addresses, from a public mirror of Proton's server list (closes
  https://git.eeqj.de/sneak/routewatch/issues/236).
 - 2026-11-10: the IP lookup finds PTR names over DNS-over-HTTPS and caches them
  for the record's TTL, in memory and in `cache.db` (closes
  https://git.eeqj.de/sneak/routewatch/issues/238).
@@ -8,11 +8,8 @@ require (
 	github.com/go-chi/chi/v5 v5.2.2
 	github.com/google/btree v1.1.3
 	github.com/google/uuid v1.6.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/mattn/go-sqlite3 v1.14.29
 	github.com/maxmind/mmdbwriter v1.2.0
 	github.com/miekg/dns v1.1.73
 	github.com/oschwald/maxminddb-golang/v2 v2.9.0
 	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9
 	go.uber.org/fx v1.24.0
 	go4.org/netipx v0.0.0-20260823151212-3075585bcbeb
@@ -25,5 +22,5 @@ require (
 	go.uber.org/multierr v1.10.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
 	golang.org/x/net v0.57.0 // indirect
-	golang.org/x/sys v0.49.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
 )
@@ -1,5 +1,7 @@
 github.com/bits-and-blooms/bitset v1.26.0 h1:WPvcPZbP1yuKofmjs2SYIFO1EjzIGhCP9ducElLsh5Q=
 github.com/bits-and-blooms/bitset v1.26.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-chi/chi/v5 v5.2.2 h1:CMwsvRVTbXVytCk1Wd72Zy1LAsAh9GxMmSNWLHCG618=
@@ -8,20 +10,16 @@ github.com/google/btree v1.1.3 h1:CVpQJjYgC4VbzxeGVHfvZrv1ctoYCAI8vbl07Fcxlyg=
 github.com/google/btree v1.1.3/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/mattn/go-sqlite3 v1.14.29 h1:1O6nRLJKvsi1H2Sj0Hzdfojwt8GiGKm+LOfLaBFaouQ=
 github.com/mattn/go-sqlite3 v1.14.29/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/maxmind/mmdbwriter v1.2.0 h1:hyvDopImmgvle3aR8AaddxXnT0iQH2KWJX3vNfkwzYM=
 github.com/maxmind/mmdbwriter v1.2.0/go.mod h1:EQmKHhk2y9DRVvyNxwCLKC5FrkXZLx4snc5OlLY5XLE=
 github.com/miekg/dns v1.1.73 h1:uhT8nJxmTrPJYClxVxTCX+CVn6qnzSiybRk72Z6DgrE=
 github.com/miekg/dns v1.1.73/go.mod h1:RW2Obtfd5NZHvOFe3zYG0W8koWOQtAzyHaLo8vASBuQ=
-github.com/oschwald/maxminddb-golang/v2 v2.9.0 h1:YpIl3WoA9oIuNvqNaO/aD1N/7Ci2wOqoKH5GWo53H5Y=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/oschwald/maxminddb-golang/v2 v2.9.0/go.mod h1:3TxexMBcR0ss3SbyYvnqfsDzDjN4o1KCg/nTsaMAivU=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 h1:bsUq1dX0N8AOIL7EB/X911+m4EHsnWEHeJ0c+3TTBrg=
 github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
-github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
+github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
-github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 go.uber.org/dig v1.19.0 h1:BACLhebsYdpQ7IROQ1AGPjrXcP5dF80U3gKoFzbaq/4=
 go.uber.org/dig v1.19.0/go.mod h1:Us0rSJiThwCv2GteUN0Q7OKvU7n5J4dxZ9JKUXozFdE=
 go.uber.org/fx v1.24.0 h1:wE8mruvpg2kiiL1Vqd0CC+tr0/24XIB10Iwp2lLWzkg=
@@ -32,16 +30,14 @@ go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
 go.uber.org/multierr v1.10.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 go.uber.org/zap v1.26.0 h1:sI7k6L95XOKS281NhVKOFCUNIvv9e0w4BF8N3u+tCRo=
 go.uber.org/zap v1.26.0/go.mod h1:dtElttAiwGvoJ/vj4IwHBS/gXsEu/pZ50mUIRWuG0so=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 go4.org/netipx v0.0.0-20260823151212-3075585bcbeb h1:XBM4hvfwGAttkkiTIFfeigdfcL1xIfdKXqFdgiHGtDs=
 go4.org/netipx v0.0.0-20260823151212-3075585bcbeb/go.mod h1:PLyyIXexvUFg3Owu6p/WfdlivPbZJsZdgWZlrGope/Y=
 golang.org/x/net v0.57.0 h1:K5+3DljvIuDG9/Jv9rvyMywYNFCQ9RSUY6OOTTkT+tE=
 golang.org/x/net v0.57.0/go.mod h1:KpXc8iv+r3XplLAG/f7Jsf9RPszJzdR0f58q9vGOuEU=
 golang.org/x/sync v0.24.0 h1:iqiDrGoDgyuvAKrhLQthUEzU/R378N78gXbBjxed7oA=
 golang.org/x/sync v0.24.0/go.mod h1:sUUOizhqBxiL6pEWpqNLUiaJn1ShEbZ6BBqskPbjZm0=
-golang.org/x/sys v0.49.0 h1:XbzkgYJHdqh/8m2Uu0W/dQv8nktxx4BFHp1M0gROTXA=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/sys v0.49.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
 golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
 golang.org/x/text v0.43.0 h1:1QivrlhwAsnMOcqgOdl9my7s9OyZl8O5/UGUTJVXoWc=
@@ -6,19 +6,3 @@ CREATE TABLE IF NOT EXISTS hostnames (
    names TEXT NOT NULL,
    expires_at INTEGER NOT NULL
 );
 -- geolocations holds the answers of geojs. A part geojs does not know is NULL.
 -- fetched_at is in seconds since 1970.
 CREATE TABLE IF NOT EXISTS geolocations (
    address TEXT PRIMARY KEY,
    country_code TEXT,
    country TEXT,
    continent_code TEXT,
    region TEXT,
    city TEXT,
    latitude REAL,
    longitude REAL,
    accuracy_radius_km INTEGER,
    time_zone TEXT,
    fetched_at INTEGER NOT NULL
 );
@@ -1,253 +0,0 @@
 package geo
 import (
 	"context"
 	"database/sql"
 	"errors"
 	"fmt"
 	"maps"
 	"time"
 )
 const (
 	// entryLifetime is how long a geojs answer is kept after its fetch.
 	entryLifetime = 7 * 24 * time.Hour
 	// flushInterval is how often new answers are written to cache.db.
 	flushInterval = 5 * time.Second
 	// sweepInterval is how often expired answers are deleted.
 	sweepInterval = 10 * time.Minute
 	// rowColumns are the columns of the geolocations table in the order
 	// scanRow reads them.
 	rowColumns = "address, country_code, country, continent_code, region, " +
 		"city, latitude, longitude, accuracy_radius_km, time_zone, fetched_at"
 )
 // rowScanner is the Scan method of *sql.Row and *sql.Rows.
 type rowScanner interface {
 	Scan(dest ...any) error
 }
 // cached returns the current answer held for address, from memory, then from
 // the answers waiting to be written, then from cache.db. It returns nil when
 // there is none.
 func (l *Locator) cached(ctx context.Context, address string) *Location {
 	found, ok := l.entries.Get(address)
 	if ok {
 		if !l.expired(found) {
 			return found
 		}
 		l.entries.Remove(address)
 	}
 	l.pendingMu.Lock()
 	waiting := l.pending[address]
 	l.pendingMu.Unlock()
 	if waiting != nil && !l.expired(waiting) {
 		l.entries.Add(address, waiting)
 		return waiting
 	}
 	stored, err := l.readRow(ctx, address)
 	if err != nil {
 		l.logger.Warn("Failed to read a geolocation cache row",
 			"address", address, "error", err)
 		return nil
 	}
 	if stored != nil {
 		l.entries.Add(address, stored)
 	}
 	return stored
 }
 // expired says whether the answer is at the end of its lifetime.
 func (l *Locator) expired(answer *Location) bool {
 	return !l.now().Before(answer.Updated.Add(entryLifetime))
 }
 // cutoff returns the fetch time at or before which an answer has expired.
 func (l *Locator) cutoff() int64 {
 	return l.now().Add(-entryLifetime).Unix()
 }
 // store keeps an answer in memory and queues it for cache.db. While cache.db
 // cannot be written, the queue stops growing at maxEntries answers.
 func (l *Locator) store(address string, answer *Location) {
 	l.entries.Add(address, answer)
 	l.pendingMu.Lock()
 	defer l.pendingMu.Unlock()
 	if len(l.pending) < l.maxEntries {
 		l.pending[address] = answer
 	}
 }
 // keepCache writes new answers and deletes expired ones until ctx ends.
 func (l *Locator) keepCache(ctx context.Context) {
 	flushes := time.NewTicker(flushInterval)
 	defer flushes.Stop()
 	sweeps := time.NewTicker(sweepInterval)
 	defer sweeps.Stop()
 	for {
 		select {
 		case <-ctx.Done():
 			l.flush(context.WithoutCancel(ctx))
 			return
 		case <-flushes.C:
 			l.flush(ctx)
 		case <-sweeps.C:
 			l.sweep(ctx)
 		}
 	}
 }
 // load reads the answers that have not expired into memory, at most maxEntries
 // of them, the newest last so that they are the last to be dropped.
 func (l *Locator) load(ctx context.Context) error {
 	rows, err := l.db.QueryContext(ctx,
 		"SELECT "+rowColumns+" FROM (SELECT "+rowColumns+" FROM geolocations "+
 			"WHERE fetched_at > ? ORDER BY fetched_at DESC LIMIT ?) "+
 			"ORDER BY fetched_at",
 		l.cutoff(), l.maxEntries)
 	if err != nil {
 		return fmt.Errorf("reading the geolocation cache: %w", err)
 	}
 	defer func() { _ = rows.Close() }()
 	for rows.Next() {
 		address, answer, err := scanRow(rows)
 		if err != nil {
 			return fmt.Errorf("reading a geolocation cache row: %w", err)
 		}
 		l.entries.Add(address, answer)
 	}
 	err = rows.Err()
 	if err != nil {
 		return fmt.Errorf("reading the geolocation cache: %w", err)
 	}
 	return nil
 }
 // readRow returns the current answer for address in cache.db, or nil when it
 // has none.
 func (l *Locator) readRow(
 	ctx context.Context, address string,
 ) (*Location, error) {
 	row := l.db.QueryRowContext(ctx,
 		"SELECT "+rowColumns+" FROM geolocations "+
 			"WHERE address = ? AND fetched_at > ?",
 		address, l.cutoff())
 	_, answer, err := scanRow(row)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, nil //nolint:nilnil // no row is not a failure
 	}
 	return answer, err
 }
 // scanRow reads one row of the geolocations table.
 func scanRow(row rowScanner) (string, *Location, error) {
 	var (
 		address string
 		fetched int64
 		answer  Location
 	)
 	err := row.Scan(&address, &answer.CountryCode, &answer.Country,
 		&answer.ContinentCode, &answer.Region, &answer.City, &answer.Latitude,
 		&answer.Longitude, &answer.AccuracyRadiusKm, &answer.TimeZone, &fetched)
 	if err != nil {
 		return "", nil, err
 	}
 	answer.Source = sourceGeoJS
 	answer.Updated = time.Unix(fetched, 0).UTC()
 	return address, &answer, nil
 }
 // flush writes the pending answers to cache.db. Those it cannot write stay
 // pending, unless a newer answer for the address has arrived meanwhile.
 func (l *Locator) flush(ctx context.Context) {
 	l.pendingMu.Lock()
 	batch := l.pending
 	l.pending = make(map[string]*Location)
 	l.pendingMu.Unlock()
 	if len(batch) == 0 {
 		return
 	}
 	err := l.writeRows(ctx, batch)
 	if err == nil {
 		return
 	}
 	l.logger.Error("Failed to write the geolocation cache", "error", err)
 	l.pendingMu.Lock()
 	defer l.pendingMu.Unlock()
 	maps.Insert(batch, maps.All(l.pending))
 	l.pending = batch
 }
 // writeRows writes batch to cache.db in one transaction.
 func (l *Locator) writeRows(
 	ctx context.Context, batch map[string]*Location,
 ) error {
 	tx, err := l.db.BeginTx(ctx, nil)
 	if err != nil {
 		return err
 	}
 	defer func() { _ = tx.Rollback() }()
 	for address, answer := range batch {
 		_, err = tx.ExecContext(ctx,
 			"INSERT OR REPLACE INTO geolocations ("+rowColumns+") "+
 				"VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
 			address, answer.CountryCode, answer.Country, answer.ContinentCode,
 			answer.Region, answer.City, answer.Latitude, answer.Longitude,
 			answer.AccuracyRadiusKm, answer.TimeZone, answer.Updated.Unix())
 		if err != nil {
 			return err
 		}
 	}
 	return tx.Commit()
 }
 // sweep deletes the expired answers from memory and cache.db.
 func (l *Locator) sweep(ctx context.Context) {
 	for _, address := range l.entries.Keys() {
 		answer, ok := l.entries.Peek(address)
 		if ok && l.expired(answer) {
 			l.entries.Remove(address)
 		}
 	}
 	_, err := l.db.ExecContext(ctx,
 		"DELETE FROM geolocations WHERE fetched_at <= ?", l.cutoff())
 	if err != nil {
 		l.logger.Error("Failed to delete expired geolocation cache rows",
 			"error", err)
 	}
 }
@@ -1,349 +0,0 @@
 package geo
 import (
 	"compress/gzip"
 	"context"
 	"errors"
 	"fmt"
 	"io"
 	"io/fs"
 	"net/http"
 	"net/netip"
 	"os"
 	"path/filepath"
 	"time"
 	"github.com/oschwald/maxminddb-golang/v2"
 )
 const (
 	// DatabaseDownloadFormat is the URL of DB-IP's City Lite database, with %s
 	// for the year and month.
 	DatabaseDownloadFormat = "https://download.db-ip.com/free/" +
 		"dbip-city-lite-%s.mmdb.gz"
 	// databaseMonthFormat is the year and month in the URL.
 	databaseMonthFormat = "2006-01"
 	// databaseFileName is the copy of the database in the state directory.
 	databaseFileName = "dbip-city-lite.mmdb"
 	// databaseDownloadSuffix ends the name of the file a download is written
 	// to, until it has opened.
 	databaseDownloadSuffix = ".download"
 	// maxDatabaseSize is the largest database accepted once unpacked, in
 	// bytes.
 	maxDatabaseSize = 200 << 20
 	// databaseDownloadTimeout limits one download.
 	databaseDownloadTimeout = 10 * time.Minute
 	// databaseCheckInterval is how often RouteWatch checks whether a new
 	// month's database is due. A new month's file appears some time on the
 	// first of the month, so a failed download is tried again this much later.
 	databaseCheckInterval = time.Hour
 )
 var (
 	errDatabaseStatus  = errors.New("unexpected HTTP status from DB-IP")
 	errDatabaseTooLong = errors.New("database is over the size limit")
 )
 // dbipName is the part of a database record that holds an English name.
 type dbipName struct {
 	Names struct {
 		English string `maxminddb:"en"`
 	} `maxminddb:"names"`
 }
 // dbipRecord is the part of a database record RouteWatch reads.
 type dbipRecord struct {
 	City      dbipName `maxminddb:"city"`
 	Continent struct {
 		Code string `maxminddb:"code"`
 	} `maxminddb:"continent"`
 	Country struct {
 		dbipName
 		ISOCode string `maxminddb:"iso_code"`
 	} `maxminddb:"country"`
 	Location struct {
 		Latitude  *float64 `maxminddb:"latitude"`
 		Longitude *float64 `maxminddb:"longitude"`
 	} `maxminddb:"location"`
 	Subdivisions []dbipName `maxminddb:"subdivisions"`
 }
 // location returns the record as a Location fetched at the time given. The
 // first subdivision is the region. The database has no accuracy radius and no
 // time zone.
 func (r *dbipRecord) location(fetched time.Time) *Location {
 	found := &Location{
 		CountryCode:   nilIfEmpty(r.Country.ISOCode),
 		Country:       nilIfEmpty(r.Country.Names.English),
 		ContinentCode: nilIfEmpty(r.Continent.Code),
 		City:          nilIfEmpty(r.City.Names.English),
 		Latitude:      r.Location.Latitude,
 		Longitude:     r.Location.Longitude,
 		Source:        sourceDBIP,
 		Updated:       fetched,
 	}
 	if len(r.Subdivisions) > 0 {
 		found.Region = nilIfEmpty(r.Subdivisions[0].Names.English)
 	}
 	return found
 }
 // nilIfEmpty returns a pointer to text, or nil when text is empty.
 func nilIfEmpty(text string) *string {
 	if text == "" {
 		return nil
 	}
 	return &text
 }
 // fromDatabase returns where the copy of the database places addr. It returns
 // nil when there is no copy yet or the copy has no record for addr. It also
 // returns nil, and logs the error, when reading the copy fails.
 func (l *Locator) fromDatabase(addr netip.Addr) *Location {
 	l.databaseMu.RLock()
 	defer l.databaseMu.RUnlock()
 	if l.database == nil {
 		return nil
 	}
 	result := l.database.Lookup(addr)
 	err := result.Err()
 	if err != nil {
 		l.logger.Error("Failed to look up an address in the database",
 			"address", addr, "error", err)
 		return nil
 	}
 	if !result.Found() {
 		return nil
 	}
 	var record dbipRecord
 	err = result.Decode(&record)
 	if err != nil {
 		l.logger.Error("Failed to read a database record",
 			"address", addr, "error", err)
 		return nil
 	}
 	return record.location(l.databaseFetched)
 }
 // keepDatabaseCurrent downloads the database when it is due, at once and then
 // every databaseCheckInterval, until ctx ends.
 func (l *Locator) keepDatabaseCurrent(ctx context.Context) {
 	l.downloadDatabaseIfDue(ctx)
 	checks := time.NewTicker(databaseCheckInterval)
 	defer checks.Stop()
 	for {
 		select {
 		case <-ctx.Done():
 			return
 		case <-checks.C:
 			l.downloadDatabaseIfDue(ctx)
 		}
 	}
 }
 // downloadDatabaseIfDue downloads this month's database, unless the copy in
 // use was downloaded this month. A failure leaves the copy as it is.
 func (l *Locator) downloadDatabaseIfDue(ctx context.Context) {
 	now := l.now().UTC()
 	if !l.databaseDue(now) {
 		return
 	}
 	err := l.downloadDatabase(ctx, now)
 	if err != nil && ctx.Err() == nil {
 		l.logger.Error("Database download failed; keeping the previous copy",
 			"error", err)
 	}
 }
 // databaseDue says whether there is no open copy or it is from an earlier
 // month than now.
 func (l *Locator) databaseDue(now time.Time) bool {
 	l.databaseMu.RLock()
 	defer l.databaseMu.RUnlock()
 	return l.database == nil ||
 		l.databaseFetched.Format(databaseMonthFormat) !=
 			now.Format(databaseMonthFormat)
 }
 // downloadDatabase fetches the database of now's month. The file replaces the
 // copy, on disk and in use, only once it has opened.
 func (l *Locator) downloadDatabase(ctx context.Context, now time.Time) error {
 	ctx, cancel := context.WithTimeout(ctx, databaseDownloadTimeout)
 	defer cancel()
 	url := fmt.Sprintf(l.databaseURLFormat, now.Format(databaseMonthFormat))
 	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
 	if err != nil {
 		return err
 	}
 	request.Header.Set(userAgentHeader, userAgent)
 	response, err := l.client.Do(request)
 	if err != nil {
 		return err
 	}
 	defer func() { _ = response.Body.Close() }()
 	if response.StatusCode != http.StatusOK {
 		return fmt.Errorf("%w: %s", errDatabaseStatus, response.Status)
 	}
 	return l.replaceDatabase(response.Body, now)
 }
 // replaceDatabase unpacks the gzip stream body beside the copy, then makes the
 // result the copy once it has opened. Whatever fails, the file it wrote is
 // removed and the copy stays.
 func (l *Locator) replaceDatabase(body io.Reader, now time.Time) error {
 	root, err := os.OpenRoot(l.dir)
 	if err != nil {
 		return err
 	}
 	defer func() { _ = root.Close() }()
 	downloadName := databaseFileName + databaseDownloadSuffix
 	err = unpackDatabase(root, downloadName, body, l.maxDatabaseBytes)
 	if err != nil {
 		_ = root.Remove(downloadName)
 		return err
 	}
 	opened, err := maxminddb.Open(filepath.Join(l.dir, downloadName))
 	if err != nil {
 		_ = root.Remove(downloadName)
 		return fmt.Errorf("opening the downloaded database: %w", err)
 	}
 	err = root.Rename(downloadName, databaseFileName)
 	if err != nil {
 		_ = opened.Close()
 		_ = root.Remove(downloadName)
 		return err
 	}
 	l.useDatabase(opened, now.Truncate(time.Second))
 	l.logger.Info("Downloaded a new copy of the database")
 	return nil
 }
 // unpackDatabase writes the gzip stream body to the file name in root, up to
 // limit bytes once unpacked.
 func unpackDatabase(
 	root *os.Root, name string, body io.Reader, limit int64,
 ) error {
 	unpacked, err := gzip.NewReader(body)
 	if err != nil {
 		return fmt.Errorf("unpacking the database: %w", err)
 	}
 	f, err := root.Create(name)
 	if err != nil {
 		return err
 	}
 	defer func() { _ = f.Close() }()
 	written, err := io.Copy(f, io.LimitReader(unpacked, limit+1))
 	if err != nil {
 		return fmt.Errorf("unpacking the database: %w", err)
 	}
 	if written > limit {
 		return errDatabaseTooLong
 	}
 	return nil
 }
 // openDatabaseCopy opens the copy left by an earlier run, if there is one. A
 // copy that does not open is treated as no copy, so it is downloaded again.
 func (l *Locator) openDatabaseCopy() {
 	path := filepath.Join(l.dir, databaseFileName)
 	info, err := os.Stat(path)
 	if errors.Is(err, fs.ErrNotExist) {
 		return
 	}
 	if err != nil {
 		l.logger.Error("Failed to read the database copy", "error", err)
 		return
 	}
 	opened, err := maxminddb.Open(path)
 	if err != nil {
 		l.logger.Error("Failed to open the database copy", "error", err)
 		return
 	}
 	l.useDatabase(opened, info.ModTime().UTC().Truncate(time.Second))
 }
 // useDatabase makes opened the copy in use and closes the one it replaces.
 func (l *Locator) useDatabase(opened *maxminddb.Reader, fetched time.Time) {
 	l.databaseMu.Lock()
 	defer l.databaseMu.Unlock()
 	if l.database != nil {
 		err := l.database.Close()
 		if err != nil {
 			l.logger.Error("Failed to close the old database copy", "error", err)
 		}
 	}
 	l.database = opened
 	l.databaseFetched = fetched
 }
 // closeDatabase closes the copy in use, after which no source can answer from
 // it.
 func (l *Locator) closeDatabase() {
 	l.databaseMu.Lock()
 	defer l.databaseMu.Unlock()
 	if l.database == nil {
 		return
 	}
 	err := l.database.Close()
 	if err != nil {
 		l.logger.Error("Failed to close the database copy", "error", err)
 	}
 	l.database = nil
 }
@@ -1,151 +0,0 @@
 package geo
 import (
 	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"math"
 	"net/http"
 	"net/netip"
 	"strconv"
 	"strings"
 	"time"
 )
 const (
 	// GeoJSEndpoint is the URL of the geojs geo endpoint.
 	GeoJSEndpoint = "https://get.geojs.io/v1/ip/geo.json"
 	// geojsTimeLimit limits one request to geojs.
 	geojsTimeLimit = time.Second
 	// geojsAddressSeparator separates the addresses of one request.
 	geojsAddressSeparator = ","
 	// geojsUnknown is what geojs sends for a value it does not know.
 	geojsUnknown = "nil"
 	// maxGeoJSAnswerBytes is far more than an answer for the most addresses
 	// an IP lookup can ask about.
 	maxGeoJSAnswerBytes = 1 << 20
 )
 var errGeoJSStatus = errors.New("unexpected HTTP status from geojs")
 // geojsAnswer is one address's entry in an answer from geojs.
 //
 //nolint:tagliatelle // the keys geojs sends
 type geojsAnswer struct {
 	IP            string `json:"ip"`
 	CountryCode   string `json:"country_code"`
 	Country       string `json:"country"`
 	ContinentCode string `json:"continent_code"`
 	Region        string `json:"region"`
 	City          string `json:"city"`
 	Latitude      string `json:"latitude"`
 	Longitude     string `json:"longitude"`
 	Accuracy      *int   `json:"accuracy"`
 	TimeZone      string `json:"timezone"`
 }
 // askGeoJS asks geojs about addresses in one request, and returns its answers
 // by address. An address geojs left out, or gave no country, city or
 // coordinates for, has no entry.
 func (l *Locator) askGeoJS(
 	ctx context.Context, addresses []string,
 ) (map[string]*Location, error) {
 	ctx, cancel := context.WithTimeout(ctx, l.timeLimit)
 	defer cancel()
 	// A comma and a colon are legal in a query, and the escaped forms are
 	// not what geojs documents.
 	url := l.geojsURL + "?ip=" + strings.Join(addresses, geojsAddressSeparator)
 	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
 	if err != nil {
 		return nil, err
 	}
 	request.Header.Set(userAgentHeader, userAgent)
 	response, err := l.client.Do(request)
 	if err != nil {
 		return nil, err
 	}
 	defer func() { _ = response.Body.Close() }()
 	if response.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("%w: %d", errGeoJSStatus, response.StatusCode)
 	}
 	var parsed []geojsAnswer
 	err = json.NewDecoder(io.LimitReader(response.Body, maxGeoJSAnswerBytes)).
 		Decode(&parsed)
 	if err != nil {
 		return nil, fmt.Errorf("reading the geojs answer: %w", err)
 	}
 	fetched := l.now().UTC().Truncate(time.Second)
 	answers := make(map[string]*Location, len(parsed))
 	for _, answer := range parsed {
 		addr, err := netip.ParseAddr(answer.IP)
 		if err != nil {
 			continue
 		}
 		location := answer.location(fetched)
 		if hasLocation(location) {
 			answers[plainAddress(addr)] = location
 		}
 	}
 	return answers, nil
 }
 // hasLocation says whether found has a country, a city or a coordinate.
 func hasLocation(found *Location) bool {
 	return found.CountryCode != nil || found.Country != nil ||
 		found.City != nil || found.Latitude != nil || found.Longitude != nil
 }
 // location returns the answer as a Location fetched at the time given.
 func (a geojsAnswer) location(fetched time.Time) *Location {
 	return &Location{
 		CountryCode:      knownText(a.CountryCode),
 		Country:          knownText(a.Country),
 		ContinentCode:    knownText(a.ContinentCode),
 		Region:           knownText(a.Region),
 		City:             knownText(a.City),
 		Latitude:         knownNumber(a.Latitude),
 		Longitude:        knownNumber(a.Longitude),
 		AccuracyRadiusKm: a.Accuracy,
 		TimeZone:         knownText(a.TimeZone),
 		Source:           sourceGeoJS,
 		Updated:          fetched,
 	}
 }
 // knownText returns a pointer to text, or nil when geojs does not know it.
 func knownText(text string) *string {
 	if text == "" || text == geojsUnknown {
 		return nil
 	}
 	return &text
 }
 // knownNumber returns text as a number, or nil when geojs does not know it. NaN
 // and infinity parse, but JSON cannot carry them.
 func knownNumber(text string) *float64 {
 	number, err := strconv.ParseFloat(text, 64)
 	if err != nil || math.IsNaN(number) || math.IsInf(number, 0) {
 		return nil
 	}
 	return &number
 }
@@ -1,232 +0,0 @@
 // Package geo finds where IP addresses are. It asks geojs.io, and keeps those
 // answers in memory and in cache.db. When geojs.io gives no location for an
 // address, it reads a copy of DB-IP's City Lite database, which it downloads
 // once a month.
 package geo
 import (
 	"context"
 	"database/sql"
 	"fmt"
 	"log/slog"
 	"net/http"
 	"net/netip"
 	"sync"
 	"time"
 	lru "github.com/hashicorp/golang-lru/v2"
 	"github.com/oschwald/maxminddb-golang/v2"
 )
 // The values of Location.Source.
 const (
 	sourceGeoJS = "geojs"
 	sourceDBIP  = "dbip"
 )
 const (
 	// maxEntries limits how many geojs answers are held in memory.
 	maxEntries = 250_000
 	// userAgentHeader and userAgent name routewatch to geojs and DB-IP.
 	userAgentHeader = "User-Agent"
 	userAgent       = "routewatch (+https://git.eeqj.de/sneak/routewatch)"
 )
 // Params is what New needs.
 type Params struct {
 	// DB is the open cache.db.
 	DB *sql.DB
 	// Dir is the directory that holds the copy of the database.
 	Dir string
 	// GeoJSURL is the URL of the geojs geo endpoint, GeoJSEndpoint in use.
 	GeoJSURL string
 	// DatabaseURLFormat is the URL of the database with %s for the year and
 	// month, DatabaseDownloadFormat in use.
 	DatabaseURLFormat string
 	Logger *slog.Logger
 }
 // Location is where an address is. A part the source does not know is nil.
 //
 //nolint:tagliatelle // snake_case keys, as the Go style guide asks
 type Location struct {
 	CountryCode      *string  `json:"country_code"`
 	Country          *string  `json:"country"`
 	ContinentCode    *string  `json:"continent_code"`
 	Region           *string  `json:"region"`
 	City             *string  `json:"city"`
 	Latitude         *float64 `json:"latitude"`
 	Longitude        *float64 `json:"longitude"`
 	AccuracyRadiusKm *int     `json:"accuracy_radius_km"`
 	TimeZone         *string  `json:"time_zone"`
 	// Source is geojs or dbip.
 	Source string `json:"source"`
 	// Updated is when the value was fetched: the geojs answer, or the copy of
 	// the database.
 	Updated time.Time `json:"updated"`
 }
 // Locator answers where addresses are. Start loads its cache and starts its
 // goroutines.
 type Locator struct {
 	db                *sql.DB
 	dir               string
 	geojsURL          string
 	databaseURLFormat string
 	timeLimit         time.Duration
 	maxEntries        int
 	maxDatabaseBytes  int64
 	logger            *slog.Logger
 	client            *http.Client
 	now               func() time.Time
 	// entries holds geojs answers by address, and drops the least recently
 	// used first.
 	entries *lru.Cache[string, *Location]
 	// pending holds the answers that cache.db does not have yet.
 	pendingMu sync.Mutex
 	pending   map[string]*Location
 	// database is the open copy, nil until one has opened, and databaseFetched
 	// is when that copy was downloaded. A lookup holds the read lock, so that
 	// a new copy never closes the old one under it.
 	databaseMu      sync.RWMutex
 	database        *maxminddb.Reader
 	databaseFetched time.Time
 	// stop ends the goroutines Start runs, and done is closed when they have
 	// returned.
 	stop context.CancelFunc
 	done chan struct{}
 }
 // New returns a Locator with an empty cache. Start loads it.
 func New(params Params) (*Locator, error) {
 	entries, err := lru.New[string, *Location](maxEntries)
 	if err != nil {
 		return nil, fmt.Errorf("creating the geolocation cache: %w", err)
 	}
 	return &Locator{
 		db:                params.DB,
 		dir:               params.Dir,
 		geojsURL:          params.GeoJSURL,
 		databaseURLFormat: params.DatabaseURLFormat,
 		timeLimit:         geojsTimeLimit,
 		maxEntries:        maxEntries,
 		maxDatabaseBytes:  maxDatabaseSize,
 		logger:            params.Logger.With("component", "geo"),
 		client:            &http.Client{},
 		now:               time.Now,
 		entries:           entries,
 		pending:           make(map[string]*Location),
 		done:              make(chan struct{}),
 	}, nil
 }
 // Lookup returns where each of addrs is, in the same order. The entry for an
 // address neither source answers for is nil. Addresses with no current cached
 // answer go to geojs in one request. The returned Locations are shared with
 // the cache and must not be changed.
 func (l *Locator) Lookup(ctx context.Context, addrs []netip.Addr) []*Location {
 	locations := make([]*Location, len(addrs))
 	var unanswered []string
 	for i, addr := range addrs {
 		address := plainAddress(addr)
 		locations[i] = l.cached(ctx, address)
 		if locations[i] == nil {
 			unanswered = append(unanswered, address)
 		}
 	}
 	if len(unanswered) == 0 {
 		return locations
 	}
 	answers, err := l.askGeoJS(ctx, unanswered)
 	if err != nil {
 		l.logger.Warn("geojs lookup failed; using the database", "error", err)
 	}
 	for i, addr := range addrs {
 		if locations[i] != nil {
 			continue
 		}
 		address := plainAddress(addr)
 		answer, ok := answers[address]
 		if ok {
 			l.store(address, answer)
 			locations[i] = answer
 			continue
 		}
 		locations[i] = l.fromDatabase(addr)
 	}
 	return locations
 }
 // plainAddress returns addr as the requests to geojs and the cache name it: an
 // IPv4 address mapped into IPv6 as plain IPv4, and with no zone. A client
 // chooses the zone, so it must not reach the request.
 func plainAddress(addr netip.Addr) string {
 	return addr.Unmap().WithZone("").String()
 }
 // Start loads the cached answers that have not expired and opens the copy of
 // the database, if there is one. It then starts the goroutines that write new
 // answers, delete expired ones and download the database. They run until Stop:
 // the end of ctx does not stop them.
 func (l *Locator) Start(ctx context.Context) error {
 	err := l.load(ctx)
 	if err != nil {
 		return err
 	}
 	l.logger.Info("Geolocation cache loaded", "entries", l.entries.Len())
 	l.openDatabaseCopy()
 	ctx, l.stop = context.WithCancel(context.WithoutCancel(ctx))
 	go func() {
 		defer close(l.done)
 		defer l.closeDatabase()
 		var workers sync.WaitGroup
 		workers.Go(func() { l.keepCache(ctx) })
 		workers.Go(func() { l.keepDatabaseCurrent(ctx) })
 		workers.Wait()
 	}()
 	return nil
 }
 // Stop cancels a download in progress, writes the answers cache.db does not
 // have yet, and waits until the goroutines have returned or ctx ends.
 func (l *Locator) Stop(ctx context.Context) {
 	l.stop()
 	select {
 	case <-l.done:
 		l.logger.Info("Geolocation stopped")
 	case <-ctx.Done():
 		l.logger.Warn("Stop deadline passed before the geolocation cache " +
 			"was written")
 	}
 }
@@ -21,7 +21,7 @@ const (
 	downloadTimeout = time.Minute
 	// maxDownloadSize is the size of the largest list file accepted, in
-	// bytes. The largest list, iCloud Private Relay, is about 12 MiB.
+	// bytes. The largest list, FireHOL abusers, is about 2.5 MiB.
 	maxDownloadSize = 200 << 20
 )
@@ -51,16 +51,6 @@ const (
 	// FormatIVPNJSON is IVPN's JSON server list. The hosts of its wireguard
 	// and openvpn gateways have their addresses in host and v2ray.
 	FormatIVPNJSON
 	// FormatProtonVPN has one address or network per line, with comment lines
 	// that start with #. Unlike FormatLines, a file with no addresses or
 	// networks fails.
 	FormatProtonVPN
 	// FormatICloudPrivateRelayCSV is Apple's CSV file of iCloud Private Relay
 	// networks. Each line starts with a network, followed by its country,
 	// region and city.
 	FormatICloudPrivateRelayCSV
 )
 // List is one public IP list.
@@ -70,31 +70,6 @@ const (
 	"config":{"api":{"ips":["192.0.2.73"]}}}`
 )
 // protonVPNBody is a small file in the format of the ProtonVPN-IPs list.
 const protonVPNBody = "#\n# protonvpn_ip_ranges.txt\n" +
 	"# https://github.com/tn3w/ProtonVPN-IPs\n#\n" +
 	"# The /24 block of every advertised IPv4.\n#\n" +
 	"192.0.2.0/24\n198.51.100.0/24\n"
 // protonVPNEntryBody is a small file in the format of the ProtonVPN-IPs list
 // of server addresses.
 const protonVPNEntryBody = "#\n# protonvpn_entry_ips.txt\n" +
 	"# https://github.com/tn3w/ProtonVPN-IPs\n#\n" +
 	"# Entry IPs clients connect to, resolved from ProtonVPN hostnames.\n#\n" +
 	"192.0.2.80\n2001:db8::80\n"
 // iCloudPrivateRelayAddr is an address on iCloudPrivateRelayBody.
 const iCloudPrivateRelayAddr = "2001:db8:1::5"
 // iCloudPrivateRelayBody is a small file in the format of Apple's iCloud
 // Private Relay file.
 const iCloudPrivateRelayBody = "192.0.2.0/31,GB,GB-EN,London,\n" +
 	"198.51.100.32/27,US,US-CA,Los Angeles,\n" +
 	"2001:db8:1::/64,US,US-AK,Anchorage,\n"
 // emptyFileCase names the case of a wrong document that is an empty file.
 const emptyFileCase = "an empty file"
 // errorPage is a file that is no list, as a publisher's error page is.
 const errorPage = "<!DOCTYPE html>\n<html></html>\n"
@@ -255,15 +230,6 @@ func TestLookupFindsListedAddresses(t *testing.T) {
 			},
 			unlisted: []string{"192.0.2.12", "2001:db8::2"},
 		},
 		{
 			name:   "iCloud Private Relay networks",
 			format: FormatICloudPrivateRelayCSV,
 			body:   iCloudPrivateRelayBody,
 			listed: []string{
 				"192.0.2.1", "198.51.100.63", iCloudPrivateRelayAddr,
 			},
 			unlisted: []string{"192.0.2.2", "198.51.100.64", "2001:db8:2::1"},
 		},
 	})
 }
@@ -301,20 +267,6 @@ func TestLookupFindsVPNServers(t *testing.T) {
 			listed:   []string{"192.0.2.70", "192.0.2.71", "192.0.2.72"},
 			unlisted: []string{"192.0.2.73", "2001:db8::70"},
 		},
 		{
 			name:     "ProtonVPN networks",
 			format:   FormatProtonVPN,
 			body:     protonVPNBody,
 			listed:   []string{"192.0.2.0", "192.0.2.255", "198.51.100.7"},
 			unlisted: []string{"192.0.3.1", "2001:db8::90"},
 		},
 		{
 			name:     "ProtonVPN server addresses",
 			format:   FormatProtonVPN,
 			body:     protonVPNEntryBody,
 			listed:   []string{"192.0.2.80", "2001:db8::80"},
 			unlisted: []string{"192.0.2.81", "2001:db8::81"},
 		},
 	})
 }
@@ -506,12 +458,12 @@ func TestWrongVPNDocumentFailsToParse(t *testing.T) {
 	for _, f := range formats {
 		bodies := map[string]string{
-			"not JSON":     errorPage,
+			"not JSON":      errorPage,
-			"other JSON":   `{"status":"ok","data":{"count":1}}`,
+			"other JSON":    `{"status":"ok","data":{"count":1}}`,
-			"no addresses": f.empty,
+			"no addresses":  f.empty,
-			"bad address":  f.badAddress,
+			"bad address":   f.badAddress,
-			"cut off":      f.good[:len(f.good)/2],
+			"cut off":       f.good[:len(f.good)/2],
-			emptyFileCase:  "",
+			"an empty file": "",
 		}
 		for name, body := range bodies {
@@ -527,59 +479,6 @@ func TestWrongVPNDocumentFailsToParse(t *testing.T) {
 	}
 }
 // TestWrongProtonVPNDocumentFailsToParse parses documents that are not a
 // ProtonVPN-IPs list. Each fails, so none can replace a good copy.
 func TestWrongProtonVPNDocumentFailsToParse(t *testing.T) {
 	t.Parallel()
 	bodies := map[string]string{
 		"error page":    errorPage,
 		"JSON":          `{"status":"ok"}`,
 		"comments only": "#\n# protonvpn_ip_ranges.txt\n#\n",
 		"bad network":   "192.0.2.0/24\nexample\n",
 		emptyFileCase:   "",
 	}
 	for name, body := range bodies {
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			addresses, err := parse(strings.NewReader(body), FormatProtonVPN)
 			if err == nil {
 				t.Errorf("parse returned %v and no error", addresses.Ranges())
 			}
 		})
 	}
 }
 // TestWrongICloudPrivateRelayDocumentFailsToParse parses documents that are
 // not Apple's iCloud Private Relay file. Each fails, so none can replace a
 // good copy.
 func TestWrongICloudPrivateRelayDocumentFailsToParse(t *testing.T) {
 	t.Parallel()
 	bodies := map[string]string{
 		"error page":     errorPage,
 		"JSON":           `{"status":"ok","count":1}`,
 		"no other field": "192.0.2.0/24\n",
 		"bad network":    "192.0.2.0/24,GB,GB-EN,London,\nexample,GB,GB-EN,London,\n",
 		"an address":     "192.0.2.1,GB,GB-EN,London,\n",
 		emptyFileCase:    "",
 	}
 	for name, body := range bodies {
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			addresses, err := parse(strings.NewReader(body),
 				FormatICloudPrivateRelayCSV)
 			if err == nil {
 				t.Errorf("parse returned %v and no error", addresses.Ranges())
 			}
 		})
 	}
 }
 // TestLookupMarksVPNLists looks up an address on a VPN list and on another
 // list. Only the VPN list's listing says it is one.
 func TestLookupMarksVPNLists(t *testing.T) {
@@ -624,10 +523,7 @@ func TestPublicListsMarkTheVPNLists(t *testing.T) {
 		}
 	}
-	want := []string{
+	want := []string{"ivpn", "mullvad", "nordvpn", "pia", "x4bnet", "x4bnet_v6"}
 		"ivpn", "mullvad", "nordvpn", "pia", "protonvpn", "protonvpn_entry",
 		"x4bnet", "x4bnet_v6",
 	}
 	if !slices.Equal(got, want) {
 		t.Errorf("VPN lists %v, want %v", got, want)
 	}
@@ -934,33 +830,15 @@ func TestStopCancelsADownloadInProgress(t *testing.T) {
 func TestTorExitsListHoldsIPv6Exits(t *testing.T) {
 	t.Parallel()
 	checkPublicListHolds(t, TorExitsList, onionooBody, onionooIPv6ExitAddr)
 }
 // TestICloudPrivateRelayListHoldsItsNetworks downloads a file in Apple's
 // format as the public iCloud Private Relay list, which is what an address's
 // is_relay answer comes from.
 func TestICloudPrivateRelayListHoldsItsNetworks(t *testing.T) {
 	t.Parallel()
 	checkPublicListHolds(t, ICloudPrivateRelayList, iCloudPrivateRelayBody,
 		iCloudPrivateRelayAddr)
 }
 // checkPublicListHolds downloads body as the public list called name and
 // checks that addr has one listing, which names that list.
 func checkPublicListHolds(t *testing.T, name, body, addr string) {
 	t.Helper()
 	index := slices.IndexFunc(Lists(), func(list List) bool {
-		return list.Name == name
+		return list.Name == TorExitsList
 	})
 	if index < 0 {
-		t.Fatalf("no list named %s", name)
+		t.Fatalf("no list named %s", TorExitsList)
 	}
 	list := Lists()[index]
-	_, list.URL = newPublisher(t, body)
+	_, list.URL = newPublisher(t, onionooBody)
 	b := newTestIPLists(t.TempDir(), list)
 	err := b.download(t.Context(), list)
@@ -968,9 +846,9 @@ func checkPublicListHolds(t *testing.T, name, body, addr string) {
 		t.Fatalf("download: %v", err)
 	}
-	listings := lookup(t, b, addr)
+	listings := lookup(t, b, onionooIPv6ExitAddr)
-	if len(listings) != 1 || listings[0].Name != name {
+	if len(listings) != 1 || listings[0].Name != TorExitsList {
-		t.Errorf("listings %+v, want one for %s", listings, name)
+		t.Errorf("listings %+v, want one for %s", listings, TorExitsList)
 	}
 }
@@ -8,13 +8,6 @@ import (
 // TorExitsList is the name of the list of Tor exit nodes.
 const TorExitsList = "tor_exits"
 // ICloudPrivateRelayList is the name of the list of iCloud Private Relay's
 // networks.
 const ICloudPrivateRelayList = "icloud_private_relay"
 // protonVPNIPsURL is where the ProtonVPN-IPs mirror publishes its files.
 const protonVPNIPsURL = "https://raw.githubusercontent.com/tn3w/ProtonVPN-IPs/master/"
 // How often each list is downloaded. No list is downloaded more often than
 // its publisher updates it or allows.
 const (
@@ -34,9 +27,6 @@ const (
 	fireHOLAbusersInterval = 5 * time.Hour
 	fireHOLLevel3Interval  = 3 * time.Hour
 	// Apple's iCloud Private Relay file is 12 MB, so once a day.
 	iCloudPrivateRelayInterval = 24 * time.Hour
 	// Spamhaus asks that DROP be downloaded at most once a day:
 	// https://www.spamhaus.org/blocklists/do-not-route-or-peer/
 	spamhausDROPInterval = 24 * time.Hour
@@ -91,13 +81,6 @@ func nonVPNLists() []List {
 			Interval: fireHOLLevel3Interval,
 			Format:   FormatLines,
 		},
 		{
 			Name:        ICloudPrivateRelayList,
 			Description: "In a network where iCloud Private Relay traffic leaves",
 			URL:         "https://mask-api.icloud.com/egress-ip-ranges.csv",
 			Interval:    iCloudPrivateRelayInterval,
 			Format:      FormatICloudPrivateRelayCSV,
 		},
 		{
 			Name: "spamhaus_drop",
 			Description: "In an IPv4 network that Spamhaus says spammers " +
@@ -163,28 +146,6 @@ func vpnLists() []List {
 			Format:      FormatPIAJSON,
 			VPN:         true,
 		},
 		{
 			// Proton's own server list needs a logged-in session, so this is
 			// the public ProtonVPN-IPs mirror of it. Proton publishes only
 			// the addresses clients connect to. The mirror's README says
 			// traffic leaves from others in the same /24, so this file of
 			// /24 networks is the one it says to use for detecting exits.
 			Name: "protonvpn",
 			Description: "In a /24 network that holds a server of the " +
 				"ProtonVPN service",
 			URL:      protonVPNIPsURL + "protonvpn_ip_ranges.txt",
 			Interval: vpnListInterval,
 			Format:   FormatProtonVPN,
 			VPN:      true,
 		},
 		{
 			Name:        "protonvpn_entry",
 			Description: "A server of the ProtonVPN service",
 			URL:         protonVPNIPsURL + "protonvpn_entry_ips.txt",
 			Interval:    vpnListInterval,
 			Format:      FormatProtonVPN,
 			VPN:         true,
 		},
 		{
 			Name: "x4bnet",
 			Description: "In an IPv4 network of a VPN service, according to " +
@@ -25,10 +25,6 @@ const (
 	// dshieldFieldSeparator separates the fields of a DShield line.
 	dshieldFieldSeparator = "\t"
 	// iCloudPrivateRelayFieldSeparator separates the fields of a line of
 	// Apple's iCloud Private Relay file.
 	iCloudPrivateRelayFieldSeparator = ","
 	// spamhausMetadataType is the type of the line that ends a Spamhaus
 	// file. That line holds the file's metadata and no network.
 	spamhausMetadataType = "metadata"
@@ -62,10 +58,6 @@ func parse(r io.Reader, format Format) (*netipx.IPSet, error) {
 		return parsePIA(r)
 	case FormatIVPNJSON:
 		return parseIVPN(r)
 	case FormatProtonVPN:
 		return parseLinesNotEmpty(r, addAddressOrNetwork)
 	case FormatICloudPrivateRelayCSV:
 		return parseLinesNotEmpty(r, addICloudPrivateRelayNetwork)
 	default:
 		return nil, errUnknownFormat
 	}
@@ -337,41 +329,6 @@ func parseIVPN(r io.Reader) (*netipx.IPSet, error) {
 	return addressSet(texts)
 }
 // parseLinesNotEmpty is parseLines for a list that always holds addresses, so
 // a file with none fails.
 func parseLinesNotEmpty(
 	r io.Reader, addLine func(*netipx.IPSetBuilder, string) error,
 ) (*netipx.IPSet, error) {
 	addresses, err := parseLines(r, addLine)
 	if err != nil {
 		return nil, err
 	}
 	if len(addresses.Ranges()) == 0 {
 		return nil, errNoAddresses
 	}
 	return addresses, nil
 }
 // addICloudPrivateRelayNetwork adds the network at the start of a line of
 // Apple's iCloud Private Relay file to builder.
 func addICloudPrivateRelayNetwork(builder *netipx.IPSetBuilder, line string) error {
 	field, _, found := strings.Cut(line, iCloudPrivateRelayFieldSeparator)
 	if !found {
 		return errNoNetwork
 	}
 	network, err := netip.ParsePrefix(field)
 	if err != nil {
 		return err
 	}
 	builder.AddPrefix(network)
 	return nil
 }
 // readJSON reads r to its end and decodes it, as one JSON document, into v.
 func readJSON(r io.Reader, v any) error {
 	data, err := io.ReadAll(r)
@@ -19,7 +19,6 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/cachedb"
 	"git.eeqj.de/sneak/routewatch/internal/config"
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/geo"
 	"git.eeqj.de/sneak/routewatch/internal/iplist"
 	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/metrics"
@@ -68,7 +67,6 @@ type RouteWatch struct {
 	ipLists        *iplist.IPLists
 	cacheDB        *sql.DB
 	ptrCache       *ptr.Cache
 	geoLocator     *geo.Locator
 }
 // ipListsDirName is the directory in the state directory that holds the IP
@@ -162,11 +160,6 @@ func (rw *RouteWatch) Run(ctx context.Context) error {
 		return err
 	}
 	err = rw.startGeoLocator(ctx)
 	if err != nil {
 		return err
 	}
 	// Start HTTP server
 	err = rw.server.Start(ctx)
 	if err != nil {
@@ -185,9 +178,8 @@ func (rw *RouteWatch) Run(ctx context.Context) error {
 // Shutdown stops all services in order: the streamer, the handlers, which
 // write what they hold, the WHOIS fetcher, the database maintainer, the
-// IP list downloads, the HTTP server, the geolocation cache and the PTR cache,
+// IP list downloads, the HTTP server and the PTR cache, and last the database,
-// and last the database, which it checkpoints and closes. Each stage waits at
+// which it checkpoints and closes. Each stage waits at most until ctx ends, so
 // most until ctx ends, so
 // Shutdown returns soon after: a handler logs what it could not write by
 // then, and the HTTP server closes the connections of requests still
 // running.
@@ -247,10 +239,6 @@ func (rw *RouteWatch) Shutdown(ctx context.Context) {
 			"error", err)
 	}
 	if rw.geoLocator != nil {
 		rw.geoLocator.Stop(ctx)
 	}
 	rw.stopPTRCache(ctx)
 	rw.closeDatabase(ctx)
@@ -295,32 +283,6 @@ func (rw *RouteWatch) startPTRCache(ctx context.Context) error {
 	return nil
 }
 // startGeoLocator loads the geolocation cache from cache.db, which
 // startPTRCache has opened, and gives the server the locator. The HTTP handlers
 // read it without a lock, so it is set before they run.
 func (rw *RouteWatch) startGeoLocator(ctx context.Context) error {
 	locator, err := geo.New(geo.Params{
 		DB:                rw.cacheDB,
 		Dir:               rw.config.StateDir,
 		GeoJSURL:          geo.GeoJSEndpoint,
 		DatabaseURLFormat: geo.DatabaseDownloadFormat,
 		Logger:            rw.logger.Logger,
 	})
 	if err != nil {
 		return err
 	}
 	err = locator.Start(ctx)
 	if err != nil {
 		return err
 	}
 	rw.geoLocator = locator
 	rw.server.SetGeoLocator(locator)
 	return nil
 }
 // stopPTRCache stops the PTR cache, which writes the answers cache.db does not
 // have yet, and closes cache.db, unless ctx has ended and a write may still be
 // running.
@@ -17,7 +17,6 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/bogon"
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/geo"
 	"git.eeqj.de/sneak/routewatch/internal/iplist"
 	"git.eeqj.de/sneak/routewatch/internal/metrics"
 	"git.eeqj.de/sneak/routewatch/internal/ristypes"
@@ -765,9 +764,9 @@ type IPLookupResponse struct {
 }
 // IPLookupResult is the answer for one address: its PTR names, its flags, its
-// live route and that route's AS, the IP lists that contain it, and where it
+// live route and that route's AS, and the IP lists that contain it. Every
-// is. Every result has every field. The fields of IPInfo are null when the
+// result has every field. The fields of IPInfo are null when the address has
-// address has no live route.
+// no live route.
 //
 //nolint:tagliatelle // snake_case keys, as the Go style guide asks
 type IPLookupResult struct {
@@ -785,9 +784,6 @@ type IPLookupResult struct {
 	// IPLists has one entry for each IP list the address is on.
 	IPLists []iplist.Listing `json:"ip_lists"`
 	// Geo is where the address is. It is nil when no source answers.
 	Geo *geo.Location `json:"geo"`
 }
 // IPLookupFlags are the yes-or-no facts about an address. Every result has
@@ -801,9 +797,6 @@ type IPLookupFlags struct {
 	// IsVPN says that the address is on a list of VPN servers.
 	IsVPN bool `json:"is_vpn"`
 	// IsRelay says that the address is on the iCloud Private Relay list.
 	IsRelay bool `json:"is_relay"`
 	// IsBogon says that the address is reserved, as package bogon tells.
 	IsBogon bool `json:"is_bogon"`
 }
@@ -846,8 +839,6 @@ func (s *Server) handleIPInfo() http.HandlerFunc {
 			return
 		}
 		locations := s.geoLocations(ctx, ipsToLookup)
 		// Track ASNs that need WHOIS refresh
 		refreshASNs := make(map[int]bool)
@@ -883,9 +874,7 @@ func (s *Server) handleIPInfo() http.HandlerFunc {
 				return
 			}
-			result := s.ipLookupResult(ip, ptrs, ipInfo)
+			response.Results = append(response.Results, s.ipLookupResult(ip, ptrs, ipInfo))
 			result.Geo = locations[ip]
 			response.Results = append(response.Results, result)
 			if ipInfo.NeedsWHOISRefresh {
 				refreshASNs[*ipInfo.ASN] = true
@@ -1036,52 +1025,10 @@ func ipLookupFlags(ip string, listings []iplist.Listing) IPLookupFlags {
 		IsVPN: slices.ContainsFunc(listings, func(l iplist.Listing) bool {
 			return l.VPN
 		}),
 		IsRelay: slices.ContainsFunc(listings, func(l iplist.Listing) bool {
 			return l.Name == iplist.ICloudPrivateRelayList
 		}),
 		IsBogon: isBogon(ip),
 	}
 }
 // geoLocations returns where ips are, by address. An address that does not
 // parse has no entry. Nor has a reserved one, which is sent to no outside
 // source and has no location.
 func (s *Server) geoLocations(
 	ctx context.Context, ips []string,
 ) map[string]*geo.Location {
 	if s.geoLocator == nil {
 		return nil
 	}
 	var (
 		kept  []string
 		addrs []netip.Addr
 	)
 	for _, ip := range ips {
 		addr, err := netip.ParseAddr(ip)
 		if err != nil || isBogon(ip) {
 			continue
 		}
 		kept = append(kept, ip)
 		addrs = append(addrs, addr)
 	}
 	if len(addrs) == 0 {
 		return nil
 	}
 	answers := s.geoLocator.Lookup(ctx, addrs)
 	locations := make(map[string]*geo.Location, len(kept))
 	for i, ip := range kept {
 		locations[ip] = answers[i]
 	}
 	return locations
 }
 // isBogon says whether the address ip is reserved, as package bogon tells.
 func isBogon(ip string) bool {
 	addr, err := netip.ParseAddr(ip)
@@ -15,7 +15,6 @@ import (
 	"slices"
 	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
 	"testing"
 	"testing/synctest"
@@ -23,7 +22,6 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/config"
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/geo"
 	"git.eeqj.de/sneak/routewatch/internal/iplist"
 	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/metrics"
@@ -1506,10 +1504,6 @@ const listedUnroutedAddr = "203.0.113.1"
 // torExitAddr is the address that fakeIPLists lists on the Tor exit list.
 const torExitAddr = "203.0.113.2"
 // relayAddr is the address that fakeIPLists lists on the iCloud Private Relay
 // list.
 const relayAddr = "203.0.113.5"
 // The addresses that fakeIPLists lists on one and on two VPN lists, and the
 // names of those lists.
 const (
@@ -1519,11 +1513,10 @@ const (
 	otherTestVPN    = "other_test_vpn"
 )
-// fakeIPLists has five lists. The test list holds addrInTestPrefixV4,
+// fakeIPLists has four lists. The test list holds addrInTestPrefixV4,
 // listedUnroutedAddr and twoVPNListsAddr. The Tor exit list holds torExitAddr.
-// The iCloud Private Relay list holds relayAddr. The test VPN list holds
+// The test VPN list holds oneVPNListAddr and twoVPNListsAddr, and the other
-// oneVPNListAddr and twoVPNListsAddr, and the other test VPN list holds
+// test VPN list holds twoVPNListsAddr.
 // twoVPNListsAddr.
 type fakeIPLists struct{}
 func testListing() iplist.Listing {
@@ -1544,10 +1537,6 @@ func (fakeIPLists) Lookup(addr netip.Addr) []iplist.Listing {
 		return []iplist.Listing{{Name: iplist.TorExitsList}}
 	}
 	if addr == netip.MustParseAddr(relayAddr) {
 		return []iplist.Listing{{Name: iplist.ICloudPrivateRelayList}}
 	}
 	if addr == netip.MustParseAddr(oneVPNListAddr) {
 		return []iplist.Listing{{Name: testVPNList, VPN: true}}
 	}
@@ -1580,22 +1569,20 @@ func TestIPLookupFlags(t *testing.T) {
 		name  string
 		addr  string
 		tor   bool
 		relay bool
 		bogon bool
 	}{
-		{"on the Tor exit list", torExitAddr, true, false, true},
+		{"on the Tor exit list", torExitAddr, true, true},
-		{"on the iCloud Private Relay list", relayAddr, false, true, true},
+		{"on another list", listedUnroutedAddr, false, true},
-		{"on another list", listedUnroutedAddr, false, false, true},
+		{"routed IPv4", addrInTestPrefixV4, false, true},
-		{"routed IPv4", addrInTestPrefixV4, false, false, true},
+		{"routed IPv6", addrInTestPrefixV6, false, true},
-		{"routed IPv6", addrInTestPrefixV6, false, false, true},
+		{"private IPv4", "10.0.0.1", false, true},
-		{"private IPv4", "10.0.0.1", false, false, true},
+		{"loopback IPv4", "127.0.0.1", false, true},
-		{"loopback IPv4", "127.0.0.1", false, false, true},
+		{"public IPv4", "1.1.1.1", false, false},
-		{"public IPv4", "1.1.1.1", false, false, false},
+		{"private IPv6", "fd00::1", false, true},
-		{"private IPv6", "fd00::1", false, false, true},
+		{"loopback IPv6", "::1", false, true},
-		{"loopback IPv6", "::1", false, false, true},
+		{"public IPv6", "2606:4700:4700::1111", false, false},
-		{"public IPv6", "2606:4700:4700::1111", false, false, false},
+		{"public IPv4 in IPv6 form", "::ffff:1.1.1.1", false, false},
-		{"public IPv4 in IPv6 form", "::ffff:1.1.1.1", false, false, false},
+		{"private IPv4 in IPv6 form", "::ffff:10.0.0.1", false, true},
 		{"private IPv4 in IPv6 form", "::ffff:10.0.0.1", false, false, true},
 	}
 	for _, tt := range tests {
@@ -1617,8 +1604,7 @@ func TestIPLookupFlags(t *testing.T) {
 			}
 			want := map[string]bool{
-				"is_tor": tt.tor, "is_vpn": false, "is_relay": tt.relay,
+				"is_tor": tt.tor, "is_vpn": false, "is_bogon": tt.bogon,
 				"is_bogon": tt.bogon,
 			}
 			if !maps.Equal(got, want) {
 				t.Errorf("%s: flags %v, want %v", path, got, want)
@@ -1627,131 +1613,6 @@ func TestIPLookupFlags(t *testing.T) {
 	}
 }
 // fakeGeoLocator answers every address with location, and keeps the addresses
 // of each call. It is safe for the concurrent subtests that share it.
 type fakeGeoLocator struct {
 	location *geo.Location
 	mu    sync.Mutex
 	calls [][]netip.Addr
 }
 func (f *fakeGeoLocator) Lookup(
 	_ context.Context, addrs []netip.Addr,
 ) []*geo.Location {
 	f.mu.Lock()
 	defer f.mu.Unlock()
 	f.calls = append(f.calls, addrs)
 	answers := make([]*geo.Location, len(addrs))
 	for i := range addrs {
 		answers[i] = f.location
 	}
 	return answers
 }
 // TestIPLookupGivesTheGeoObject looks up two public addresses. They go to the
 // locator in one call, and each result has the geo object under the keys the
 // API documents. These addresses are public, because a reserved one is not
 // looked up.
 func TestIPLookupGivesTheGeoObject(t *testing.T) {
 	t.Parallel()
 	s := newServerWithTestRoutes(t)
 	useFakeResolver(s, &fakeResolver{})
 	locator := &fakeGeoLocator{location: &geo.Location{
 		CountryCode: new("DE"),
 		City:        new("Berlin"),
 		Latitude:    new(52.5),
 		Source:      "geojs",
 		Updated:     testRouteTime(0),
 	}}
 	s.SetGeoLocator(locator)
 	path := "/api/v1/ip/1.1.1.1,8.8.8.8"
 	results := resultFields(t, get(t, s, path).Body.Bytes())
 	if len(results) != 2 {
 		t.Fatalf("%s: %d results, want 2", path, len(results))
 	}
 	if len(locator.calls) != 1 || len(locator.calls[0]) != 2 {
 		t.Errorf("locator calls %v, want one with both addresses", locator.calls)
 	}
 	var got map[string]json.RawMessage
 	err := json.Unmarshal(results[0]["geo"], &got)
 	if err != nil {
 		t.Fatalf("decoding geo %s: %v", results[0]["geo"], err)
 	}
 	wantKeys := []string{
 		"accuracy_radius_km", "city", "continent_code", "country",
 		"country_code", "latitude", "longitude", "region", "source",
 		"time_zone", "updated",
 	}
 	if keys := slices.Sorted(maps.Keys(got)); !slices.Equal(keys, wantKeys) {
 		t.Errorf("geo keys %v, want %v", keys, wantKeys)
 	}
 	if string(got["city"]) != `"Berlin"` || string(got["latitude"]) != "52.5" ||
 		string(got["region"]) != jsonNull {
 		t.Errorf("wrong geo %s", results[0]["geo"])
 	}
 }
 // TestIPLookupOfAReservedAddressHasNoGeo looks up a reserved address alone and
 // beside a public one. The reserved one never reaches the locator, and its geo
 // is null.
 func TestIPLookupOfAReservedAddressHasNoGeo(t *testing.T) {
 	t.Parallel()
 	s := newServerWithTestRoutes(t)
 	useFakeResolver(s, &fakeResolver{})
 	locator := &fakeGeoLocator{location: &geo.Location{Source: "geojs"}}
 	s.SetGeoLocator(locator)
 	results := resultFields(t, get(t, s, "/api/v1/ip/"+addrInTestPrefixV4).Body.Bytes())
 	if len(results) != 1 || string(results[0]["geo"]) != jsonNull {
 		t.Fatalf("results %v, want one with geo null", results)
 	}
 	if len(locator.calls) != 0 {
 		t.Errorf("locator calls %v, want none", locator.calls)
 	}
 	results = resultFields(t,
 		get(t, s, "/api/v1/ip/"+addrInTestPrefixV4+",1.1.1.1").Body.Bytes())
 	if len(results) != 2 || string(results[0]["geo"]) != jsonNull ||
 		string(results[1]["geo"]) == jsonNull {
 		t.Errorf("results %v, want geo only for the public address", results)
 	}
 	if len(locator.calls) != 1 || len(locator.calls[0]) != 1 {
 		t.Errorf("locator calls %v, want one with one address", locator.calls)
 	}
 }
 // TestIPLookupGeoIsNullWhenNoSourceAnswers checks an address the locator has
 // no answer for.
 func TestIPLookupGeoIsNullWhenNoSourceAnswers(t *testing.T) {
 	t.Parallel()
 	s := newServerWithTestRoutes(t)
 	useFakeResolver(s, &fakeResolver{})
 	s.SetGeoLocator(&fakeGeoLocator{})
 	results := resultFields(t, get(t, s, "/api/v1/ip/1.1.1.1").Body.Bytes())
 	if len(results) != 1 || string(results[0]["geo"]) != jsonNull {
 		t.Errorf("results %v, want one with geo null", results)
 	}
 }
 // TestIPLookupReportsVPNProviders looks up addresses on no list, on a list
 // that is not a VPN list, on one VPN list and on two. is_vpn says whether any
 // VPN list holds the address, and vpn_providers names only those lists. An
@@ -24,7 +24,6 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/config"
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/geo"
 	"git.eeqj.de/sneak/routewatch/internal/iplist"
 	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/routetable"
@@ -64,12 +63,6 @@ type PTRResolver interface {
 	LookupAddr(ctx context.Context, addr string) ([]string, error)
 }
 // GeoLocator finds where addresses are, as *geo.Locator does. It returns one
 // entry for each address, nil when no source answers.
 type GeoLocator interface {
 	Lookup(ctx context.Context, addrs []netip.Addr) []*geo.Location
 }
 // Server provides HTTP endpoints for status monitoring
 type Server struct {
 	router     *chi.Mux
@@ -93,10 +86,6 @@ type Server struct {
 	// ptrResolver looks up the IP lookup's PTR names. SetPTRResolver sets it.
 	ptrResolver PTRResolver
 	// geoLocator finds where the IP lookup's addresses are. SetGeoLocator
 	// sets it.
 	geoLocator GeoLocator
 	// cards is the copy of the home page's cards that the pages serve, nil
 	// until the server first works them out
 	cards atomic.Pointer[homeCards]
@@ -220,12 +209,6 @@ func (s *Server) SetPTRResolver(resolver PTRResolver) {
 	s.ptrResolver = resolver
 }
 // SetGeoLocator sets what finds where the IP lookup's addresses are. Call it
 // before Start: the handlers read it without a lock.
 func (s *Server) SetGeoLocator(locator GeoLocator) {
 	s.geoLocator = locator
 }
 // SetASNFetcher sets the ASN WHOIS fetcher for on-demand lookups. Call it
 // before Start: the handlers read the fetcher without a lock.
 func (s *Server) SetASNFetcher(fetcher ASNFetcher) {
@@ -544,8 +544,6 @@
        <span>{{appLicense}}</span>
        <span class="separator">|</span>
        <span><a href="{{appGitCommitURL}}">{{appGitRevision}}</a></span>
        <span class="separator">|</span>
        <span>IP Geolocation by <a href="https://db-ip.com">DB-IP</a></span>
    </footer>
    <script nonce="{{.CSPNonce}}">
@@ -67,23 +67,6 @@ func TestFooterLicense(t *testing.T) {
 	}
 }
 // TestHomePageCreditsDBIP expects the home page's footer to carry the credit
 // to DB-IP.
 func TestHomePageCreditsDBIP(t *testing.T) {
 	t.Parallel()
 	const attribution = `IP Geolocation by <a href="https://db-ip.com">DB-IP</a>`
 	_, footer, found := strings.Cut(renderPage(t, templates.IndexTemplate()), "<footer")
 	if !found {
 		t.Fatal("the page has no footer")
 	}
 	if !strings.Contains(footer, attribution) {
 		t.Errorf("footer does not credit DB-IP: %q", footer)
 	}
 }
 // TestFreshnessIndicator renders the home and status pages and expects each to
 // have, right after the status element, the element where the page's script
 // shows its spinner or "stale".