diff --git a/Dockerfile b/Dockerfile
index e032576..85f806b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,8 @@ COPY backend/Cargo.toml backend/Cargo.lock ./
 RUN mkdir src && echo "fn main() {}" > src/main.rs && cargo build --release && rm -rf src
 COPY backend/src ./src
 COPY backend/migrations ./migrations
-RUN cargo build --release
+# Ensure we actually rebuild the binary with the real source
+RUN touch src/main.rs && cargo build --release
 
 # --- Final Image ---
 FROM debian:bookworm-slim
@@ -25,5 +26,6 @@ COPY --from=frontend-builder /app/frontend/build ./frontend/build
 
 ENV STATIC_DIR=/app/frontend/build
 ENV DATABASE_URL=sqlite:/data/attendance.db
+ENV JWT_SECRET=change-me-at-runtime
 EXPOSE 3000
 CMD ["./server"]
diff --git a/GEMINI.md b/GEMINI.md
index 89bc9fd..33965f1 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -33,6 +33,12 @@ TutorTool is a full-stack web application for tracking student attendance in tut
 - Node.js & npm
 - SQLite
 
+### Demo Credentials
+- **Admin**: `admin@tutortool.com` / `admin`
+
+### Environment-specific Fixes
+- **btrfs pnpm fix**: Use `--package-import-method copy` when running pnpm.
+
 ### Key Commands
 - `make dev`: Starts both backend and frontend in parallel (requires `JWT_SECRET` and `DATABASE_URL` in environment).
 - `make build`: Performs a full production build (frontend first, then backend).
diff --git a/Makefile b/Makefile
index c862163..773dc41 100644
--- a/Makefile
+++ b/Makefile
@@ -22,4 +22,4 @@ compose-up:
 
 seed-demo:
 	@echo "Seeding demo data..."
-	sqlite3 $${DATABASE_URL#sqlite:} < backend/migrations/demo_seed.sql
+	sqlite3 $${DATABASE_URL#sqlite:} < backend/demo/demo_seed.sql
diff --git a/backend/migrations/demo_seed.sql b/backend/demo/demo_seed.sql
similarity index 100%
rename from backend/migrations/demo_seed.sql
rename to backend/demo/demo_seed.sql
diff --git a/docker-compose.yml b/docker-compose.yml
index 66eb1aa..4600fd8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   app:
     build: .
@@ -10,4 +8,5 @@ services:
     environment:
       - DATABASE_URL=sqlite:/data/attendance.db
       - STATIC_DIR=/app/frontend/build
+      - JWT_SECRET=${JWT_SECRET:-dev_secret_for_demo}
     restart: always