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.
setClientLimitHwidByEmail wrote clients.limit_hwid and then trimmed client_hwids as two independent statements. A traffic-cycle Save that read the record before the limit changed could write the stale value back after it, and a failed trim committed the new limit anyway.
Both halves now run inside runSerializedTx, the transaction the traffic writer already owns. setClientLimitHwidByEmailTx and clearClientHwidsBySubIDTx refuse a handle that is not that transaction (errClientHwidWriteNotSerialized) instead of falling back to the shared handle. Client delete moves onto the same writer, and BulkCreate withdraws a re-created client's tombstone before applying its optional HWID limit.
TestSetClientLimitHwidIsSerializedWithSyncInbound holds a stale traffic-cycle Save open across the limit change and fails without the serialization (limit_hwid = 5, want 1).
MHSanaei