fixed diagrams

.devcontainer/Dockerfile

@@ -28,10 +28,10 @@ RUN wget --quiet https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86
 
 # Install additional tools or packages as needed in the base environment
 RUN conda init bash && \
-    conda install -n base -c conda-forge python=3.10 python-graphviz jupyterlab numpy pandas 'nodejs>20,<21' pip -y && \
+    conda install -n base -c conda-forge python=3.11 python-graphviz jupyterlab numpy pandas 'nodejs>20,<21' pip -y && \
     pip install mystmd && \
     pip install jupyterlab_myst && \
-    pip install datajoint && \ 
+    pip install git+https://github.com/datajoint/datajoint-python.git && \
     pip install ipython-sql && \
     pip install Faker
 

book/20-concepts/01-relational.md

@@ -222,6 +222,17 @@ Entity-relationship diagram in Chen ER notation.
 :::{figure}
 :align: center
 
+```{mermaid}
+---
+title: Crow's Foot notation.
+---
+erDiagram
+    EMPLOYEE ||--|| PROJECT : assigned-to
+```
+Entity-relationship diagram using [Crow's Foot notation](https://mermaid.js.org/syntax/entityRelationshipDiagram.html).
+:::
+
+
 ```{mermaid}
 ---
 title: Crow's Foot notation.

book/30-schema-design/060-uuid.ipynb

@@ -5,14 +5,14 @@
    "metadata": {},
    "source": [
     "# Using UUIDs\n",
-    "## Background\n",
-    "Universally Unique Identifiers (UUIDs) provide convenient mechanisms for identifying pieces of information (objects) inside an information system. Various conventions exist. However, general patterns have been established and formalized as RFC 4122.\n",
     "\n",
-    "Comprised of hex digits, UUIDs have the pattern `8-4-4-4-12`, e.g. `e45ba2cc-39db-11e9-8e62-7470fdf23ef1`.\n",
+    "Universally Unique Identifiers (UUIDs) provide a convenient mechanism for generating unique identifiers for entities inside an information system. The use of UUIDs is standardized by as RFC 4122.\n",
     "\n",
-    "It adds up to 36 characters (32 hex + 4 hyphens), or 16 bytes of information (128 bits).\n",
+    "A UUID consists of 128-bits (16 bytes) that are displayed consistently as a 36-character string comprised of hex digits hyphenated as `8-4-4-4-12`.\n",
     "\n",
-    "Python provides the [UUID module](https://docs.python.org/3/library/uuid.html) in its standard library."
+    "For example `e45ba2cc-39db-11e9-8e62-7470fdf23ef1` is a valid UUID.\n",
+    "\n",
+    "Python provides the [UUID module](https://docs.python.org/3/library/uuid.html) as part of its standard library."
    ]
   },
   {