bug: duplicate index name

sql/pre_aggregates.sql

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-create index idx_obs_spoid_day on public.observations (sampling_point_id, date_trunc('year'::text, from_time));
+create index idx_obs_spoid_year on public.observations (sampling_point_id, date_trunc('year'::text, from_time));
 create index idx_obs_spoid_day on public.observations (sampling_point_id, date_trunc('day'::text, from_time));
 VACUUM FULL ANALYZE observations;