diff --git a/19_observability/19.3_performance_optimization.md b/19_observability/19.3_performance_optimization.md
index 768e16d..a14b124 100644
--- a/19_observability/19.3_performance_optimization.md
+++ b/19_observability/19.3_performance_optimization.md
@@ -323,7 +323,8 @@ journalctl -u docker -n 100 | grep -i "oom"
 FROM python:3.14-slim
 WORKDIR /app
 COPY requirements.txt .
-RUN pip install -r requirements.txt memory_profiler tracemalloc
+# tracemalloc 是 Python 标准库模块（自 3.4 起内置），无需安装
+RUN pip install -r requirements.txt memory_profiler
 
 COPY app.py .
 CMD ["python", "-m", "memory_profiler", "app.py"]
diff --git a/21_case_devops/21.7_practical_examples.md b/21_case_devops/21.7_practical_examples.md
index 3d821a3..5d11329 100644
--- a/21_case_devops/21.7_practical_examples.md
+++ b/21_case_devops/21.7_practical_examples.md
@@ -314,7 +314,7 @@ CREATE DATABASE myappdb OWNER appuser;
 -- 创建扩展
 \c myappdb
 
-CREATE EXTENSION IF NOT EXISTS uuid-ossp;
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
 CREATE EXTENSION IF NOT EXISTS hstore;
 CREATE EXTENSION IF NOT EXISTS pg_trgm;
 
diff --git a/appendix/learning_roadmap.md b/appendix/learning_roadmap.md
index 43b3d04..b81d13f 100644
--- a/appendix/learning_roadmap.md
+++ b/appendix/learning_roadmap.md
@@ -221,8 +221,7 @@ CI/CD 集成
 ├── Buildx（多架构构建）
 ├── Skopeo（镜像管理）
 ├── Podman（替代方案）
-├── Buildah（镜像构建）
-└── Kollabot
+└── Buildah（镜像构建）
 ```
 **学习资源：**