The watchdog is a package now, not a file in this repo

[ralyodio]

Shipped here yesterday in #79 as apps/web/src/lib/db-watchdog.js. genrewatch and
watchnews both need the same thing for the same reason, so it is now
@profullstack/watchdog 0.2.0
instead of three copies.

Why a package rather than a copy

What is worth sharing is not the code, it is the reasoning:

• the probe has to go through the same client the requests use, because a second
  connection is the one thing guaranteed to look healthy during this failure
• the timeout has to be a race, not a driver option, because the symptom is a promise
  that never settles
• Redis is allowed one more failure than the pool, because a healthy Redis is routinely
  unreachable while it reloads its snapshot (26s at 1.8GB, 124s at the 8.65GB that caused
  The live tick was storing every synced row in Redis, sixty times an hour #78)

A comment explaining that is worth nothing if it lives in one of three copies, and the
numbers drift apart the moment they are duplicated.

What changes here

const watchdogs = watchDependencies({
  postgres: () => healthcheck(),
  redis: () => connection.ping(),
});

watchDependencies takes probes rather than clients, so the package stays
zero-dependency and does not care that this repo is on bun:sql and ioredis. The
DB_WATCHDOG_* and REDIS_WATCHDOG_* knobs and their defaults live there now, so this
file no longer names any of them.

• apps/web/src/lib/db-watchdog.js deleted
• test/db-watchdog.test.js deleted, the module's 19 tests live in the package
• @profullstack/watchdog added to apps/web/package.json, beside the other
  @profullstack app dependencies
• net 38 lines lighter

Behaviour is unchanged: same probes, same timings, same one-extra-failure for Redis.

Testing

bun install resolves 0.2.0, bun build apps/web/src/main.js bundles clean (which is what
actually proves the new import resolves), biome check clean, and 39 pass / 0 fail across
config, nichedb-plays and odds-archive.

The package itself is 19 tests, zero dependencies, no build step.

Note

apps/worker/src/main.js is the alternate entry for splitting workers onto their own
service, and it has no watchdog. It is not the deployed shape (the default runs web+worker
in one container via apps/web), so I left it alone rather than widen this.

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