Realtime improvements

[ra-at-diladele-com]

Currently the realtime monitor limits the number of records (day 1K). On different deployments it results into different last N minutes of activity - on busy deployments only some last minute or so; no not so busy deployments - much longer.

The more natural way of specifying history is in N minutes/hours back. So we need to:

• let admin specify - keep N minutes of last records
• store the records incrementally - like retire the old records, and push back the records being added from log
• filter the records per client - it will allow to keep the filters between refreshes - or better build a client UI in vue that would store the filters and get filtered records from the database?

It is considerable implementation efforts.

[ra-at-diladele-com]

Decided to add the show last_n_seconds value to the reporter - the last_n_records will be applied over those last _n_seconds records.