Most tests opened a throwaway panel DB with database.InitDB, which runs the
full AutoMigrate + seed on an empty file every time: ~230ms, and ~850ms under
-race because GORM's reflection-heavy migration is what the detector slows
most. internal/web/service does this in ~550 of its 830 tests, so the CI race
job spent ~10 of its ~14.6 minutes re-migrating empty databases.
internal/database/dbtest.InitDB migrates once per test process, then hands
each test its own copy of that file (~130ms under -race) and registers the
CloseDB cleanup. The copy then goes through InitDB like a panel restart, so
every test still starts from the state a fresh install has. Tests that reopen
an existing file, migrate a hand-built legacy DB or target Postgres keep
calling database.InitDB.
Locally under -race: internal/web/service 626s (last CI run) -> 114s,
internal/sub 246s -> 35s.
statsForClient resolved usage only through paths keyed by client_traffics.inbound_id (preloaded ClientStats + the statsByEmail index). That id is written once by AddClientStat and never updated, so an inbound delete+recreate orphans the row from every loaded inbound, both paths miss, and the zero-traffic placeholder makes {{TRAFFIC_USED}} read 0.00B for pre-existing clients while the sub-info header (AggregateTrafficByEmails, email-keyed) stays correct.
Add a last-resort lookup by the globally-unique email, cached into statsByEmail for the request. Closes#5567.