link2xt 2eeacb0f8a sql: organize connection pool as a stack rather than a queue ...

When connection pool is organized as a stack,
it always returns most recently used connection.
Because each connection has its own page cache,
using the connection with fresh cache improves performance.

I commented out `oauth2::tests::test_oauth_from_mx`
because it requires network connection,
turned off the Wi-Fi and ran the tests.

Before the change, with a queue:
```
$ hyperfine "cargo test"
Benchmark 1: cargo test
  Time (mean ± σ):     56.424 s ±  4.515 s    [User: 183.181 s, System: 128.156 s]
  Range (min … max):   52.123 s … 68.193 s    10 runs
```

With a stack:
```
$ hyperfine "cargo test"
Benchmark 1: cargo test
  Time (mean ± σ):     29.887 s ±  1.377 s    [User: 101.226 s, System: 45.573 s]
  Range (min … max):   26.591 s … 31.010 s    10 runs
```

On version 1.107.1:
```
$ hyperfine "cargo test"
Benchmark 1: cargo test
  Time (mean ± σ):     43.658 s ±  1.079 s    [User: 202.582 s, System: 50.723 s]
  Range (min … max):   41.531 s … 45.170 s    10 runs
```

2023-02-20 15:00:37 +00:00

..

migrations.rs

sql: update version first in migration transactions

2023-02-15 18:58:44 +00:00

pool.rs

sql: organize connection pool as a stack rather than a queue

2023-02-20 15:00:37 +00:00

tables.sql

Securejoin: store bobstate in database instead of context

2022-03-01 23:02:40 +01:00