2024
AzatYakupov - BTree Index in PG 0:00 of 1:09:10
    https://www.youtube.com/watch?v=hMoBH7drftk
JPoint - Salnikov - PostgreSQL Indices ru 0:00 of 2:00:44
    https://www.youtube.com/watch?v=ju9F8OvnL4E
    https://squidex.jugru.team/api/assets/srm/5a15546d-af53-46d4-be84-63367a5aaaf3/jpoint2022.andrei-.salsnikov.pdf
2023
JPoint - Sitnikov - B-Tree indices using Boot, PostgreSQL, JPA 18:00 of 45:07
    https://www.youtube.com/watch?v=y-Wtyvme4gE
    ! using indices improves search-perf, but degrades ins/upd perf
    ! indices have types
    ! 21:30 explain (analyze, costs off, buffers)  -- buffers is aprox about num of disk ops
2017
BartunovKorotkov - All truth about Indices 0:00 of 46:35
    https://www.youtube.com/watch?v=aaecM4wKdhY