fix(jobs): fix pk values circulating

[dkropachev]

There is mechanism for circulating pk values:

1. Pk value is being generated and injected into db
2. It is remembered in inflights to do not allow generators to generate same values
3. It is put into old chan
4. Read from old chan, to run validation query on it
5. Released from inflights

On some ocasions gemini either don't send values to old chan, or don't release them, which makes these values stuck in infligths and being blocked forever