diff --git a/Dockerfile b/Dockerfile
index 9dbd6dc..ec83fb0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,11 +10,15 @@ FROM rust:1.93 AS builder
 
 WORKDIR /app
 
+# Build dependencies first (cached until Cargo.toml/Cargo.lock change)
 COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo "fn main() {}" > src/main.rs && touch src/lib.rs
+ENV SQLX_OFFLINE=true
+RUN cargo build --release && rm -rf src target/release/.fingerprint/happyview-*
+
+# Build application code
 COPY src/ src/
 COPY migrations/ migrations/
-
-ENV SQLX_OFFLINE=true
 RUN cargo build --release
 
 FROM debian:bookworm-slim
diff --git a/src/aip.rs b/src/aip.rs
index 29daa07..3ac7e40 100644
--- a/src/aip.rs
+++ b/src/aip.rs
@@ -43,7 +43,7 @@ pub async fn aip_proxy(
     let upstream_resp = match req.send().await {
         Ok(r) => r,
         Err(e) => {
-            tracing::error!("AIP proxy error: {e}");
+            tracing::error!("AIP proxy error: {e:#}");
             return Response::builder()
                 .status(StatusCode::BAD_GATEWAY)
                 .body(Body::from("upstream request failed"))