The owner could not tell from the UI what "Buzz Price Tracking" enabled, what the
"Price alert threshold" number meant, or what "Price Alerts" was alerting about.
That was not a copy problem: the implementation exposed our mechanism (a page
scrape) and our SQL predicates as the user's concepts. Two concrete defects came
from the same root:
- the alert population included versions the user already owns (neither the event
generator nor the query filtered on is_in_library; in the owner's library 28 of
52 gated versions were already downloaded, so most "alerts" were about files
already on disk, which cannot become cheaper *for them*);
- a threshold-filtered state list lived in a notification surface, so an empty
panel had three indistinguishable causes and read as a broken feature.
The information model is now the version plus ownership: cost is shown only where
a decision exists. Owned -> nothing. Not owned and free -> nothing. Not owned and
gated -> the price when it is known, `Paid` without a number when it is not, and
early access keeps its countdown because "free on <date>" decides between waiting
and paying. The numeric threshold has no place in that model: every decision is
categorical (wait / pay / skip), so the setting, the comparison and the whole
alert-state machine are gone.
- both alert-state columns are removed from the schema rather than left dead; a
database created by an unreleased build has them dropped on open (native
ALTER TABLE ... DROP COLUMN, guarded), which is a no-op for everyone else
- gate events are emitted only for versions the user does not have, and the
price-drop event goes with the threshold it belonged to
- both alert endpoints, PriceAlertsHandler and the service-registry adapter field
it needed are removed: events already reach the UI through the refresh response
- the bell tab, panel, CSS, both entry points, the unread watermark and their
locales are removed; the setting keeps only the enable flag and the refresh
interval and is framed as plumbing
- "Price unavailable" is replaced by `Paid`: the gate is certain from the public
API, only the number is best-effort, and that is our plumbing, not the user's
problem
Verified against a copy of the owner's real database: 52 gated versions ->
28 owned (now silent) + 24 the feature is actually about; the drop migration ran
and both removed endpoints 404.
Will Miao
e42d649df0