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backend/src/db/mod.rs

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+use std::time::Duration;
+
+use anyhow::Context;
+use redis::Client as RedisClient;
+use sqlx::{postgres::PgPoolOptions, PgPool};
+
+pub async fn connect_postgres(database_url: Option<&str>) -> anyhow::Result<Option<PgPool>> {
+    match database_url {
+        Some(url) if !url.trim().is_empty() => {
+            let pool = PgPoolOptions::new()
+                .max_connections(5)
+                .acquire_timeout(Duration::from_secs(5))
+                .connect(url)
+                .await
+                .with_context(|| format!("failed to connect to postgres at {url}"))?;
+            Ok(Some(pool))
+        }
+        _ => Ok(None),
+    }
+}
+
+pub fn connect_redis(redis_url: Option<&str>) -> anyhow::Result<Option<RedisClient>> {
+    match redis_url {
+        Some(url) if !url.trim().is_empty() => {
+            Ok(Some(RedisClient::open(url).context("failed to open redis client")?))
+        }
+        _ => Ok(None),
+    }
+}