statement_timeout issue

I know there are a lot of moving parts to this issue but I think I've
eliminated most of them and the problem comes down to the postgresql server
generating a statement_timeout error after 10 seconds when the connection
statement_timeout is actually set to 15 minutes.

My web server gets a database handle which it keeps for the duration of the
function that generates the response. Multiple queries can be sent and
will use the same handle.

After getting the handle I issue "show statement_timeout" and log the
result which shows 15 minutes.

84876:May 4 08:31:06 seattle-vm-1-0 nsd: STATEMENT_TIMEOUT IS:
84877-May 4 08:31:06 seattle-vm-1-0 nsd: statement_timeout = 15min

Then I send a query, and it generates a statement_timeout error after 10
seconds.

The log has a CONTEXT which indicates a foreign key lookup was going on at
the time which is fine...

2018-05-04 04:05:20 PDT [62028]: [82-1] ERROR: canceling statement due to
statement timeout
2018-05-04 04:05:20 PDT [62028]: [83-1] CONTEXT: SQL statement "SELECT 1
FROM ONLY "public"."clients" x WHERE "c_id" OPERATOR(pg_catalog.=) $1 FOR
KEY SHARE OF x"
2018-05-04 04:05:20 PDT [62028]: [84-1] STATEMENT: INSERT /*

Is there anything I'm not thinking of?

Thanks!

- Ian