diff --git a/Dockerfile b/Dockerfile
index db178e6..d7f793d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -42,9 +42,9 @@ COPY . .
 # 同时注入 OPENAI_API_KEY / DEEPSEEK_API_KEY 占位值，避免 openai SDK v6+ 构造时抛错
 # (build 期不会真正调用 AI，仅为通过模块求值)
 ARG DATABASE_URL
-RUN if [ ! -f .env ]; then cp .env.example .env 2>/dev/null || echo "DATABASE_URL=placeholder" > .env; fi \
+RUN echo "=== ARG raw ===" && echo "${DATABASE_URL}" && echo "=== env dump ===" && env | grep DATABASE && echo "=== .env file ===" && cat .env | grep DATABASE 2>/dev/null && echo "=== .env.example ===" && cat .env.example | grep DATABASE 2>/dev/null && if [ ! -f .env ]; then cp .env.example .env 2>/dev/null || echo "DATABASE_URL=placeholder" > .env; fi \
  && export DATABASE_URL="${DATABASE_URL:-placeholder}" \
- && echo "=== DEBUG DATABASE_URL ==== ${DATABASE_URL}" \
+ && echo "=== FINAL DATABASE_URL ===" && echo "$DATABASE_URL" \
  && export DEEPSEEK_API_KEY="${DEEPSEEK_API_KEY:-sk-build-placeholder}" \
  && export OPENAI_API_KEY="${OPENAI_API_KEY:-sk-build-placeholder}" \
  && npx prisma generate \