fix: add SQLite busy_timeout to prevent read failures under scanner load

Without busy_timeout, concurrent scanner writes could cause API reads
to fail immediately instead of waiting. Sets 5s timeout.

Author: Kenbak

src/db.rs

@@ -5,7 +5,8 @@ use std::str::FromStr;
 pub async fn create_pool(database_url: &str) -> anyhow::Result<SqlitePool> {
     let options = SqliteConnectOptions::from_str(database_url)?
         .create_if_missing(true)
-        .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal);
+        .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
+        .busy_timeout(std::time::Duration::from_secs(5));
 
     let pool = SqlitePoolOptions::new()
         .max_connections(5)