Use non-blocking logging io and LTO in release

Also tweak README explanation of sqlx prepare.

Cargo.lock

@@ -146,6 +146,7 @@ dependencies = [
  "sqlx",
  "tokio",
  "tracing",
+ "tracing-appender",
  "tracing-futures",
  "tracing-subscriber",
  "url",
@@ -1889,6 +1890,17 @@ dependencies = [
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-appender"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7aa52d56cc0d79ab604e8a022a1cebc4de33cf09dc9933c94353bea2e00d6e88"
+dependencies = [
+ "chrono",
+ "crossbeam-channel",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "tracing-attributes"
 version = "0.1.11"

Cargo.toml

@@ -28,7 +28,11 @@ url = "2.1"
 async-trait = "0.1"
 seahash = "4.0"
 tracing = "0.1"
+tracing-appender = "0.1"
 tracing-subscriber = "0.2"
 tracing-futures = "0.2"
 lru = "0.5"
 http = "0.2"
+
+[profile.release]
+lto = true

README.md

@@ -195,7 +195,8 @@ A new migration can be created by running: `sqlx migrate add <name>`.
 
 To allow the docker container for the API to get built in CI without a
 database, the `sqlx-data.json` file needs to be re-generated every time the
-database schema changes. It can be generated with `cargo sqlx prepare`.
+database schema changes or any query is updated. It can be generated with `cargo 
+sqlx prepare`.
 
 ## Authentication
 

src/main.rs

@@ -58,10 +58,11 @@ async fn main() -> Result<()> {
     let env_log_filter =
         env::var("RUST_LOG").unwrap_or_else(|_| "warp=info,bazaar_realm_api=info".to_owned());
 
+    let (non_blocking_writer, _guard) = tracing_appender::non_blocking(std::io::stdout());
     tracing_subscriber::fmt()
         .with_env_filter(env_log_filter)
         .with_span_events(FmtSpan::CLOSE)
-        .with_writer(std::io::stdout)
+        .with_writer(non_blocking_writer)
         .init();
 
     let host = env::var("HOST").expect("`HOST` environment variable not defined");