Is it possible to keep track of SELECTs?

Hi,

Our legacy 3-tier backend is adding a feature requested by users,
to keep track of the last-access-time of projects. The primary purpose
is to archive projects which haven't been used (read from) in a while
(offline),
or perhaps move them to a cheaper / slower storage tier (still online, but
slow access).

In our new 2-tier PostgreSQL-based "backend", project = schema, there's no
mid-tier
services we control anymore, only whatever PostgreSQL records about SELECTs.
(I'm assuming other kinds of accesses, like (AUTO or not) VACUUM, are
tracked differently).

The docs at [1] mentions:
> The parameter track_counts controls whether cumulative statistics
> are collected about table and index ***accesses***. (emphasis mine)

So is it possible to track the last time a SELECT was performed on some
TABLE?
And how would one go about setting that up, if not ON by default?

Thanks, --DD

[1]:
https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-STATS-SETUP