use entrypoint

docker/Dockerfile

@@ -19,7 +19,10 @@ ENV PRISMA_LOG_LEVEL=info
 
 RUN mkdir -p /challenge-api/reports
 
-RUN echo "Running database migrations..."
-RUN npx prisma migrate deploy
+# Copy entrypoint script and make it executable
+COPY docker/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
-CMD ["node","/challenge-api/app.js"]
+# Use entrypoint to run migrations at startup (not build time)
+# Prisma uses PostgreSQL advisory locks to prevent concurrent migrations
+ENTRYPOINT ["/entrypoint.sh"]

docker/entrypoint.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+set -e
+
+echo "Starting Challenge API v6..."
+
+# Run database migrations
+# Prisma uses PostgreSQL advisory locks to prevent concurrent migrations
+# Only one instance will run migrations, others will wait
+echo "Running database migrations..."
+npx prisma migrate deploy
+
+# Check migration status
+if [ $? -eq 0 ]; then
+    echo "Migrations completed successfully"
+else
+    echo "Migration failed with exit code $?"
+    exit 1
+fi
+
+# Start the application
+echo "Starting application server..."
+exec node /challenge-api/app.js