Add backend

backend/src/db.rs

@@ -0,0 +1,15 @@
+use anyhow::Result;
+use sqlx::{migrate::Migrator, sqlite::SqlitePoolOptions, SqlitePool};
+
+static MIGRATOR: Migrator = sqlx::migrate!("./migrations");
+
+pub async fn init_pool(database_url: &str) -> Result<SqlitePool> {
+    let pool = SqlitePoolOptions::new()
+        .max_connections(5)
+        .connect(database_url)
+        .await?;
+
+    MIGRATOR.run(&pool).await?;
+
+    Ok(pool)
+}