Postgresql generate series with interval '15 minutes' longer than 29092 items - postgresql

Question

Sut:
create table meter.materialized_quarters
(
id int4 not null generated by default as identity,
tm timestamp without time zone
,constraint pk_materialized_quarters primary key (id)
--,constraint uq_materialized_quarters unique (tm)
);
Then setup data:
insert into meter.materialized_quarters (tm)
select GENERATE_SERIES ('1999-01-01', '2030-10-30', interval '15 minute');
And check data:
select count(*),tm
from meter.materialized_quarters
group by tm
having count(*)> 1
Some results:
count|tm |
-----+-----------------------+
2|1999-10-31 02:00:00.000|
2|1999-10-31 02:15:00.000|
2|1999-10-31 02:30:00.000|
2|1999-10-31 02:45:00.000|
2|2000-10-29 02:00:00.000|
2|2000-10-29 02:15:00.000|
2|2000-10-29 02:30:00.000|
2|2000-10-29 02:45:00.000|
2|2001-10-28 02:00:00.000|
2|2001-10-28 02:15:00.000|
2|2001-10-28 02:30:00.000|
....
Details:
select * from meter.materialized_quarters where tm = '1999-10-31 01:45:00';
Result:
id |tm |
-----+-----------------------+
29092|1999-10-31 01:45:00.000|
As I see, 29092 is maximum series of nonduplicated data generated by: GENERATE_SERIES with 15 minutes interval.
How to fill table (meter.materialized_quarters) from 1999 to 2030?
One solution is:
insert into meter.materialized_quarters (tm)
select GENERATE_SERIES ('1999-01-01', '1999-10-31 01:45:00', interval '15 minute');
then:
insert into meter.materialized_quarters (tm)
select GENERATE_SERIES ('1999-10-31 02:00:00.000', '2000-10-29 00:00:00.000', interval '15 minute');
and again, and again.
Or
with bad as (
select count(*),tm
from meter.materialized_quarters
group by tm
having count(*)> 1
)
, ids as (
select mq1.id, mq2.id as iddel
from meter.materialized_quarters mq1 inner join bad on bad.tm = mq1.tm inner join meter.materialized_quarters mq2 on bad.tm = mq2.tm
where mq1.id<mq2.id
)
delete from meter.materialized_quarters
where id in (select iddel from ids);
Is there more 'elegant' way?
EDIT.
I see the problem.
xxxx-10-29 02:00:00 - summer time become winter time.
select GENERATE_SERIES ('1999-10-31 01:45:00', '1999-10-31 02:00:00', interval '15 minute');

Answer 1

Your problem is the conversion from timestamp WITH time zone which is returned by generate_series() and your column which is defined as timestamp WITHOUT time zone.
1999-10-31 is the day where daylight savings time changes (at least in some countries)
If you change your column to timestamp WITH time zone your code works without any modification.
Example
If you want to stick with timestamp WITHOUT timestamp you need to convert the value returned by generate_series()
insert into materialized_quarters (tm)
select g.tm at time zone 'UTC' --<< change to the time zone you need
from GENERATE_SERIES ('1999-01-01', '2030-10-30', interval '15 minute') as g(tm)
Example