diff --git a/book/appendix_csvs.html b/book/appendix_csvs.html
index 8070248..d0b5901 100644
--- a/book/appendix_csvs.html
+++ b/book/appendix_csvs.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Swapping Out the Infrastructure: Do Everything with CSVs</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -518,7 +513,7 @@ <h3 id="_implementing_a_repository_and_unit_of_work_for_csvs"><a class="anchor"
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/appendix_django.html b/book/appendix_django.html
index 4a7755c..6c9a224 100644
--- a/book/appendix_django.html
+++ b/book/appendix_django.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Repository and Unit of Work Patterns with Django</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -795,7 +790,7 @@ <h3 id="_steps_along_the_way"><a class="anchor" href="#_steps_along_the_way"></a
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-07-05 09:48:27 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/appendix_ds1_table.html b/book/appendix_ds1_table.html
index f9f8593..3ef04e4 100644
--- a/book/appendix_ds1_table.html
+++ b/book/appendix_ds1_table.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Summary Diagram and Table</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -260,7 +260,7 @@ <h2 id="appendix_ds1_table">Appendix A: Summary Diagram and Table<a class="ancho
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/appendix_project_structure.html b/book/appendix_project_structure.html
index 544520c..4ff1213 100644
--- a/book/appendix_project_structure.html
+++ b/book/appendix_project_structure.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>A Template Project Structure</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -444,34 +439,34 @@ <h3 id="_docker_compose_and_containers_config"><a class="anchor" href="#_docker_
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">version</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-s">"3"</span><span class="tok-w"></span>
-<span class="tok-nt">services</span><span class="tok-p">:</span><span class="tok-w"></span>
+<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">version</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-s">"3"</span>
+<span class="tok-nt">services</span><span class="tok-p">:</span>
 
 <span class="tok-w">  </span><span class="tok-nt">app</span><span class="tok-p">:</span><span class="tok-w">  </span>#<b class="conum">(1)</b>
-<span class="tok-w">    </span><span class="tok-nt">build</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-nt">context</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">.</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-nt">dockerfile</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">Dockerfile</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">depends_on</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">postgres</span><span class="tok-w"></span>
+<span class="tok-w">    </span><span class="tok-nt">build</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-nt">context</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">.</span>
+<span class="tok-w">      </span><span class="tok-nt">dockerfile</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">Dockerfile</span>
+<span class="tok-w">    </span><span class="tok-nt">depends_on</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">postgres</span>
 <span class="tok-w">    </span><span class="tok-nt">environment</span><span class="tok-p">:</span><span class="tok-w">  </span>#<b class="conum">(3)</b>
 <span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">DB_HOST=postgres</span><span class="tok-w">  </span><b class="conum">(4)</b>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">DB_PASSWORD=abc123</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">API_HOST=app</span><span class="tok-w"></span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">DB_PASSWORD=abc123</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">API_HOST=app</span>
 <span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">PYTHONDONTWRITEBYTECODE=1</span><span class="tok-w">  </span>#<b class="conum">(5)</b>
 <span class="tok-w">    </span><span class="tok-nt">volumes</span><span class="tok-p">:</span><span class="tok-w">  </span>#<b class="conum">(6)</b>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">./src:/src</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">./tests:/tests</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span><span class="tok-w"></span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">./src:/src</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">./tests:/tests</span>
+<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span>
 <span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"5005:80"</span><span class="tok-w">  </span><b class="conum">(7)</b>
 
 
-<span class="tok-w">  </span><span class="tok-nt">postgres</span><span class="tok-p">:</span><span class="tok-w"></span>
+<span class="tok-w">  </span><span class="tok-nt">postgres</span><span class="tok-p">:</span>
 <span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">postgres:9.6</span><span class="tok-w">  </span>#<b class="conum">(2)</b>
-<span class="tok-w">    </span><span class="tok-nt">environment</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">POSTGRES_USER=allocation</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">POSTGRES_PASSWORD=abc123</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"54321:5432"</span><span class="tok-w"></span></code></pre>
+<span class="tok-w">    </span><span class="tok-nt">environment</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">POSTGRES_USER=allocation</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">POSTGRES_PASSWORD=abc123</span>
+<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"54321:5432"</span></code></pre>
 </div>
 </div>
 </div>
@@ -602,19 +597,19 @@ <h3 id="_dockerfile"><a class="anchor" href="#_dockerfile"></a>Dockerfile</h3>
 <span class="tok-c"># RUN apt install gcc libpq (no longer needed bc we use psycopg2-binary)</span>
 
 <b class="conum">(2)</b>
-<span class="tok-k">COPY</span><span class="tok-w"> </span>requirements.txt /tmp/
-<span class="tok-k">RUN</span><span class="tok-w"> </span>pip install -r /tmp/requirements.txt
+<span class="tok-k">COPY</span><span class="tok-w"> </span>requirements.txt<span class="tok-w"> </span>/tmp/
+<span class="tok-k">RUN</span><span class="tok-w"> </span>pip<span class="tok-w"> </span>install<span class="tok-w"> </span>-r<span class="tok-w"> </span>/tmp/requirements.txt
 
 <b class="conum">(3)</b>
-<span class="tok-k">RUN</span><span class="tok-w"> </span>mkdir -p /src
-<span class="tok-k">COPY</span><span class="tok-w"> </span>src/ /src/
-<span class="tok-k">RUN</span><span class="tok-w"> </span>pip install -e /src
-<span class="tok-k">COPY</span><span class="tok-w"> </span>tests/ /tests/
+<span class="tok-k">RUN</span><span class="tok-w"> </span>mkdir<span class="tok-w"> </span>-p<span class="tok-w"> </span>/src
+<span class="tok-k">COPY</span><span class="tok-w"> </span>src/<span class="tok-w"> </span>/src/
+<span class="tok-k">RUN</span><span class="tok-w"> </span>pip<span class="tok-w"> </span>install<span class="tok-w"> </span>-e<span class="tok-w"> </span>/src
+<span class="tok-k">COPY</span><span class="tok-w"> </span>tests/<span class="tok-w"> </span>/tests/
 
 <b class="conum">(4)</b>
 <span class="tok-k">WORKDIR</span><span class="tok-w"> </span><span class="tok-s">/src</span>
-<span class="tok-k">ENV</span><span class="tok-w"> </span><span class="tok-nv">FLASK_APP</span><span class="tok-o">=</span>allocation/entrypoints/flask_app.py <span class="tok-nv">FLASK_DEBUG</span><span class="tok-o">=</span><span class="tok-m">1</span> <span class="tok-nv">PYTHONUNBUFFERED</span><span class="tok-o">=</span><span class="tok-m">1</span>
-<span class="tok-k">CMD</span><span class="tok-w"> </span>flask run --host<span class="tok-o">=</span><span class="tok-m">0</span>.0.0.0 --port<span class="tok-o">=</span><span class="tok-m">80</span></code></pre>
+<span class="tok-k">ENV</span><span class="tok-w"> </span><span class="tok-nv">FLASK_APP</span><span class="tok-o">=</span>allocation/entrypoints/flask_app.py<span class="tok-w"> </span><span class="tok-nv">FLASK_DEBUG</span><span class="tok-o">=</span><span class="tok-m">1</span><span class="tok-w"> </span><span class="tok-nv">PYTHONUNBUFFERED</span><span class="tok-o">=</span><span class="tok-m">1</span>
+<span class="tok-k">CMD</span><span class="tok-w"> </span>flask<span class="tok-w"> </span>run<span class="tok-w"> </span>--host<span class="tok-o">=</span><span class="tok-m">0</span>.0.0.0<span class="tok-w"> </span>--port<span class="tok-o">=</span><span class="tok-m">80</span></code></pre>
 </div>
 </div>
 </div>
@@ -753,7 +748,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/appendix_validation.html b/book/appendix_validation.html
index e8e3a8a..9713ce3 100644
--- a/book/appendix_validation.html
+++ b/book/appendix_validation.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Validation</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -295,9 +290,9 @@ <h3 id="_validating_syntax"><a class="anchor" href="#_validating_syntax"></a>Val
 <span class="tok-k">class</span> <span class="tok-nc">Allocate</span><span class="tok-p">(</span><span class="tok-n">Command</span><span class="tok-p">):</span>
 
     <span class="tok-n">_schema</span> <span class="tok-o">=</span> <span class="tok-n">Schema</span><span class="tok-p">({</span>  #<b class="conum">(1)</b>
-        <span class="tok-s1">'orderid'</span><span class="tok-p">:</span> <span class="tok-nb">int</span><span class="tok-p">,</span>
-         <span class="tok-n">sku</span><span class="tok-p">:</span> <span class="tok-nb">str</span><span class="tok-p">,</span>
-         <span class="tok-n">qty</span><span class="tok-p">:</span> <span class="tok-n">And</span><span class="tok-p">(</span><span class="tok-n">Use</span><span class="tok-p">(</span><span class="tok-nb">int</span><span class="tok-p">),</span> <span class="tok-k">lambda</span> <span class="tok-n">n</span><span class="tok-p">:</span> <span class="tok-n">n</span> <span class="tok-o">&gt;</span> <span class="tok-mi">0</span><span class="tok-p">)</span>
+        <span class="tok-s1">'orderid'</span><span class="tok-p">:</span> <span class="tok-nb">str</span><span class="tok-p">,</span>
+        <span class="tok-s1">'sku'</span><span class="tok-p">:</span> <span class="tok-nb">str</span><span class="tok-p">,</span>
+        <span class="tok-s1">'qty'</span><span class="tok-p">:</span> <span class="tok-n">And</span><span class="tok-p">(</span><span class="tok-n">Use</span><span class="tok-p">(</span><span class="tok-nb">int</span><span class="tok-p">),</span> <span class="tok-k">lambda</span> <span class="tok-n">n</span><span class="tok-p">:</span> <span class="tok-n">n</span> <span class="tok-o">&gt;</span> <span class="tok-mi">0</span><span class="tok-p">)</span>
      <span class="tok-p">},</span> <span class="tok-n">ignore_extra_keys</span><span class="tok-o">=</span><span class="tok-kc">True</span><span class="tok-p">)</span>
 
     <span class="tok-n">orderid</span><span class="tok-p">:</span> <span class="tok-nb">str</span>
@@ -346,12 +341,14 @@ <h3 id="_validating_syntax"><a class="anchor" href="#_validating_syntax"></a>Val
 <span class="tok-n">quantity</span> <span class="tok-o">=</span> <span class="tok-n">And</span><span class="tok-p">(</span><span class="tok-n">Use</span><span class="tok-p">(</span><span class="tok-nb">int</span><span class="tok-p">),</span> <span class="tok-n">greater_than_zero</span><span class="tok-p">)</span>  #<b class="conum">(4)</b>
 
 <span class="tok-n">Allocate</span> <span class="tok-o">=</span> <span class="tok-n">command</span><span class="tok-p">(</span>  #<b class="conum">(5)</b>
+    <span class="tok-s1">'Allocate'</span><span class="tok-p">,</span>
     <span class="tok-n">orderid</span><span class="tok-o">=</span><span class="tok-nb">int</span><span class="tok-p">,</span>
     <span class="tok-n">sku</span><span class="tok-o">=</span><span class="tok-nb">str</span><span class="tok-p">,</span>
     <span class="tok-n">qty</span><span class="tok-o">=</span><span class="tok-n">quantity</span>
 <span class="tok-p">)</span>
 
 <span class="tok-n">AddStock</span> <span class="tok-o">=</span> <span class="tok-n">command</span><span class="tok-p">(</span>
+    <span class="tok-s1">'AddStock'</span><span class="tok-p">,</span>
     <span class="tok-n">sku</span><span class="tok-o">=</span><span class="tok-nb">str</span><span class="tok-p">,</span>
     <span class="tok-n">qty</span><span class="tok-o">=</span><span class="tok-n">quantity</span></code></pre>
 </div>
@@ -630,7 +627,7 @@ <h3 id="_validating_semantics"><a class="anchor" href="#_validating_semantics"><
         <span class="tok-bp">self</span><span class="tok-o">.</span><span class="tok-n">message</span> <span class="tok-o">=</span> <span class="tok-n">message</span>
 
 <span class="tok-k">class</span> <span class="tok-nc">ProductNotFound</span><span class="tok-p">(</span><span class="tok-n">MessageUnprocessable</span><span class="tok-p">):</span>  #<b class="conum">(2)</b>
-    <span class="tok-sd">""""</span>
+<span class="tok-w">    </span><span class="tok-sd">""""</span>
 <span class="tok-sd">    This exception is raised when we try to perform an action on a product</span>
 <span class="tok-sd">    that doesn't exist in our database.</span>
 <span class="tok-sd">    """</span><span class="tok-s2">"</span>
@@ -702,7 +699,7 @@ <h3 id="_validating_semantics"><a class="anchor" href="#_validating_semantics"><
 <div class="listingblock">
 <div class="content">
 <pre class="pygments highlight"><code data-lang="python"><span></span><span class="tok-k">class</span> <span class="tok-nc">SkipMessage</span> <span class="tok-p">(</span><span class="tok-ne">Exception</span><span class="tok-p">):</span>
-    <span class="tok-sd">""""</span>
+<span class="tok-w">    </span><span class="tok-sd">""""</span>
 <span class="tok-sd">    This exception is raised when a message can't be processed, but there's no</span>
 <span class="tok-sd">    incorrect behavior. For example, we might receive the same message multiple</span>
 <span class="tok-sd">    times, or we might receive a message that is now out of date.</span>
@@ -834,7 +831,7 @@ <h3 id="_validating_pragmatics"><a class="anchor" href="#_validating_pragmatics"
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2022-04-23 09:04:28 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_01_domain_model.html b/book/chapter_01_domain_model.html
index efdd897..5f0da22 100644
--- a/book/chapter_01_domain_model.html
+++ b/book/chapter_01_domain_model.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
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 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
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@@ -860,14 +855,14 @@ <h4 id="_dataclasses_are_great_for_value_objects"><a class="anchor" href="#_data
 <div class="content">
 <div class="listingblock skip">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">Order_reference</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">12345</span><span class="tok-w"></span>
-<span class="tok-nt">Lines</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">RED-CHAIR</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span><span class="tok-w"></span>
-<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">BLU-CHAIR</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span><span class="tok-w"></span>
-<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">GRN-CHAIR</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span><span class="tok-w"></span></code></pre>
+<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">Order_reference</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">12345</span>
+<span class="tok-nt">Lines</span><span class="tok-p">:</span>
+<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">RED-CHAIR</span>
+<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span>
+<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">BLU-CHAIR</span>
+<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span>
+<span class="tok-w">  </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-nt">sku</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">GRN-CHAIR</span>
+<span class="tok-w">    </span><span class="tok-nt">qty</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">25</span></code></pre>
 </div>
 </div>
 </div>
@@ -1398,7 +1393,7 @@ <h4 id="_exceptions_can_express_domain_concepts_too"><a class="anchor" href="#_e
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2022-04-23 09:12:42 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_02_repository.html b/book/chapter_02_repository.html
index a183f95..9b77eef 100644
--- a/book/chapter_02_repository.html
+++ b/book/chapter_02_repository.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Repository Pattern</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
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 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -1402,7 +1397,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2022-04-23 09:04:28 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_03_abstractions.html b/book/chapter_03_abstractions.html
index 25f7edc..eab4826 100644
--- a/book/chapter_03_abstractions.html
+++ b/book/chapter_03_abstractions.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>A Brief Interlude: On Coupling and Abstractions</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
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@@ -1243,7 +1238,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 <div id="footnotes">
 <hr>
 <div class="footnote" id="_footnotedef_1">
-<a href="#_footnoteref_1">1</a>. A code kata is a small, contained programming challenge often used to practice TDD. See <a href="https://oreil.ly/vhjju">"Kata&#8212;The Only Way to Learn TDD"</a> by Peter Provost.
+<a href="#_footnoteref_1">1</a>. A code kata is a small, contained programming challenge often used to practice TDD. See <a href="https://web.archive.org/web/20221024055359/http://www.peterprovost.org/blog/2012/05/02/kata-the-only-way-to-learn-tdd/">"Kata&#8212;The Only Way to Learn TDD"</a> by Peter Provost.
 </div>
 <div class="footnote" id="_footnotedef_2">
 <a href="#_footnoteref_2">2</a>. If you&#8217;re used to thinking in terms of interfaces, that&#8217;s what we&#8217;re trying to define here.
@@ -1254,7 +1249,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-07-05 09:48:27 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_04_service_layer.html b/book/chapter_04_service_layer.html
index 9998c8f..2b79542 100644
--- a/book/chapter_04_service_layer.html
+++ b/book/chapter_04_service_layer.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Our First Use Case: Flask API and Service Layer</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
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 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -842,7 +837,7 @@ <h4 id="_a_typical_service_function"><a class="anchor" href="#_a_typical_service
 </li>
 <li>
 <p>We extract the user&#8217;s commands from the web request and pass them
-to a domain service.</p>
+to the service layer.</p>
 </li>
 <li>
 <p>We return some JSON responses with the appropriate status codes.</p>
@@ -1339,7 +1334,7 @@ <h4 id="_the_dip_in_action"><a class="anchor" href="#_the_dip_in_action"></a>The
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-07-05 09:48:27 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_05_high_gear_low_gear.html b/book/chapter_05_high_gear_low_gear.html
index 48355b0..5de54f1 100644
--- a/book/chapter_05_high_gear_low_gear.html
+++ b/book/chapter_05_high_gear_low_gear.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>TDD in High Gear and Low Gear</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
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@@ -269,7 +264,7 @@ <h3 id="_how_is_our_test_pyramid_looking"><a class="anchor" href="#_how_is_our_t
 <div class="content">
 <div class="listingblock skip">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="sh"><span></span>$ grep -c test_ **/test_*.py
+<pre class="pygments highlight"><code data-lang="sh"><span></span>$<span class="tok-w"> </span>grep<span class="tok-w"> </span>-c<span class="tok-w"> </span>test_<span class="tok-w"> </span>*/*/test_*.py
 tests/unit/test_allocate.py:4
 tests/unit/test_batches.py:8
 tests/unit/test_services.py:3
@@ -872,7 +867,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_06_uow.html b/book/chapter_06_uow.html
index cf0fed5..f316124 100644
--- a/book/chapter_06_uow.html
+++ b/book/chapter_06_uow.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Unit of Work Pattern</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
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-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
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 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -418,11 +413,11 @@ <h3 id="_test_driving_a_uow_with_integration_tests"><a class="anchor" href="#_te
 
 
 <span class="tok-k">def</span> <span class="tok-nf">get_allocated_batch_ref</span><span class="tok-p">(</span><span class="tok-n">session</span><span class="tok-p">,</span> <span class="tok-n">orderid</span><span class="tok-p">,</span> <span class="tok-n">sku</span><span class="tok-p">):</span>
-    <span class="tok-p">[[</span><span class="tok-n">orderlineid</span><span class="tok-p">]]</span> <span class="tok-o">=</span> <span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>
+    <span class="tok-p">[[</span><span class="tok-n">orderlineid</span><span class="tok-p">]]</span> <span class="tok-o">=</span> <span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>  #<b class="conum">(1)</b>
         <span class="tok-s2">"SELECT id FROM order_lines WHERE orderid=:orderid AND sku=:sku"</span><span class="tok-p">,</span>
         <span class="tok-nb">dict</span><span class="tok-p">(</span><span class="tok-n">orderid</span><span class="tok-o">=</span><span class="tok-n">orderid</span><span class="tok-p">,</span> <span class="tok-n">sku</span><span class="tok-o">=</span><span class="tok-n">sku</span><span class="tok-p">),</span>
     <span class="tok-p">)</span>
-    <span class="tok-p">[[</span><span class="tok-n">batchref</span><span class="tok-p">]]</span> <span class="tok-o">=</span> <span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>
+    <span class="tok-p">[[</span><span class="tok-n">batchref</span><span class="tok-p">]]</span> <span class="tok-o">=</span> <span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>  #<b class="conum">(1)</b>
         <span class="tok-s2">"SELECT b.reference FROM allocations JOIN batches AS b ON batch_id = b.id"</span>
         <span class="tok-s2">" WHERE orderline_id=:orderlineid"</span><span class="tok-p">,</span>
         <span class="tok-nb">dict</span><span class="tok-p">(</span><span class="tok-n">orderlineid</span><span class="tok-o">=</span><span class="tok-n">orderlineid</span><span class="tok-p">),</span>
@@ -432,6 +427,21 @@ <h3 id="_test_driving_a_uow_with_integration_tests"><a class="anchor" href="#_te
 </div>
 </div>
 </div>
+<div class="colist arabic">
+<ol>
+<li>
+<p>The <code><a id="orderlineid"></a> =</code> syntax is a little too-clever-by-half, apologies.
+What&#8217;s happening is that <code>session.execute</code> returns a list of rows,
+where each row is a tuple of column values;
+in our specific case, it&#8217;s a list of one row,
+which is a tuple with one column value in.
+The double-square-bracket on the left hand side
+is doing (double) assignment-unpacking to get the single value
+back out of these two nested sequences.
+It becomes readable once you&#8217;ve used it a few times!</p>
+</li>
+</ol>
+</div>
 </div>
 <div class="sect2">
 <h3 id="_unit_of_work_and_its_context_manager"><a class="anchor" href="#_unit_of_work_and_its_context_manager"></a>Unit of Work and Its Context Manager</h3>
@@ -1164,7 +1174,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_07_aggregate.html b/book/chapter_07_aggregate.html
index 30f14da..5b33ea0 100644
--- a/book/chapter_07_aggregate.html
+++ b/book/chapter_07_aggregate.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Aggregates and Consistency Boundaries</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
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@@ -1574,7 +1569,7 @@ <h3 id="_part_i_recap"><a class="anchor" href="#_part_i_recap"></a>Part I Recap<
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-09-03 09:43:38 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_08_events_and_message_bus.html b/book/chapter_08_events_and_message_bus.html
index eb40fee..c49bf9c 100644
--- a/book/chapter_08_events_and_message_bus.html
+++ b/book/chapter_08_events_and_message_bus.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Events and the Message Bus</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -1279,7 +1274,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_09_all_messagebus.html b/book/chapter_09_all_messagebus.html
index 93ed99d..6d7ee57 100644
--- a/book/chapter_09_all_messagebus.html
+++ b/book/chapter_09_all_messagebus.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Going to Town on the Message Bus</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -511,33 +506,33 @@ <h3 id="_refactoring_service_functions_to_message_handlers"><a class="anchor" hr
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def add_batch(<span class="tok-w"></span>
-<span class="tok-gd">-    ref: str, sku: str, qty: int, eta: Optional[date],</span><span class="tok-w"></span>
-<span class="tok-gi">+    event: events.BatchCreated,</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,<span class="tok-w"></span>
-<span class="tok-w"> </span>):<span class="tok-w"></span>
-<span class="tok-w"> </span>    with uow:<span class="tok-w"></span>
-<span class="tok-gd">-        product = uow.products.get(sku=sku)</span><span class="tok-w"></span>
-<span class="tok-gi">+        product = uow.products.get(sku=event.sku)</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    ...<span class="tok-w"></span>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def add_batch(
+<span class="tok-gd">-    ref: str, sku: str, qty: int, eta: Optional[date],</span>
+<span class="tok-gi">+    event: events.BatchCreated,</span>
+<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,
+<span class="tok-w"> </span>):
+<span class="tok-w"> </span>    with uow:
+<span class="tok-gd">-        product = uow.products.get(sku=sku)</span>
+<span class="tok-gi">+        product = uow.products.get(sku=event.sku)</span>
+<span class="tok-w"> </span>    ...
 
 
-<span class="tok-w"> </span>def allocate(<span class="tok-w"></span>
-<span class="tok-gd">-    orderid: str, sku: str, qty: int,</span><span class="tok-w"></span>
-<span class="tok-gi">+    event: events.AllocationRequired,</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,<span class="tok-w"></span>
-<span class="tok-w"> </span>) -&gt; str:<span class="tok-w"></span>
-<span class="tok-gd">-    line = OrderLine(orderid, sku, qty)</span><span class="tok-w"></span>
-<span class="tok-gi">+    line = OrderLine(event.orderid, event.sku, event.qty)</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    ...<span class="tok-w"></span>
+<span class="tok-w"> </span>def allocate(
+<span class="tok-gd">-    orderid: str, sku: str, qty: int,</span>
+<span class="tok-gi">+    event: events.AllocationRequired,</span>
+<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,
+<span class="tok-w"> </span>) -&gt; str:
+<span class="tok-gd">-    line = OrderLine(orderid, sku, qty)</span>
+<span class="tok-gi">+    line = OrderLine(event.orderid, event.sku, event.qty)</span>
+<span class="tok-w"> </span>    ...
 
-<span class="tok-gi">+</span><span class="tok-w"></span>
-<span class="tok-gi">+def send_out_of_stock_notification(</span><span class="tok-w"></span>
-<span class="tok-gi">+    event: events.OutOfStock,</span><span class="tok-w"></span>
-<span class="tok-gi">+    uow: unit_of_work.AbstractUnitOfWork,</span><span class="tok-w"></span>
-<span class="tok-gi">+):</span><span class="tok-w"></span>
-<span class="tok-gi">+    email.send(</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    ...<span class="tok-w"></span></code></pre>
+<span class="tok-gi">+</span>
+<span class="tok-gi">+def send_out_of_stock_notification(</span>
+<span class="tok-gi">+    event: events.OutOfStock,</span>
+<span class="tok-gi">+    uow: unit_of_work.AbstractUnitOfWork,</span>
+<span class="tok-gi">+):</span>
+<span class="tok-gi">+    email.send(</span>
+<span class="tok-w"> </span>    ...</code></pre>
 </div>
 </div>
 </div>
@@ -647,23 +642,23 @@ <h4 id="_the_message_bus_now_collects_events_from_the_uow"><a class="anchor" hre
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-gd">-from . import messagebus  </span><span class="tok-w"></span>#<b class="conum">(1)</b>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-gd">-from . import messagebus  </span>#<b class="conum">(1)</b>
 
 
-<span class="tok-w"> </span>class AbstractUnitOfWork(abc.ABC):<span class="tok-w"></span>
-<span class="tok-gu">@@ -22,13 +21,11 @@ class AbstractUnitOfWork(abc.ABC):</span><span class="tok-w"></span>
+<span class="tok-w"> </span>class AbstractUnitOfWork(abc.ABC):
+<span class="tok-gu">@@ -22,13 +21,11 @@ class AbstractUnitOfWork(abc.ABC):</span>
 
-<span class="tok-w"> </span>    def commit(self):<span class="tok-w"></span>
-<span class="tok-w"> </span>        self._commit()<span class="tok-w"></span>
-<span class="tok-gd">-        self.publish_events()  </span><span class="tok-w"></span>#<b class="conum">(2)</b>
+<span class="tok-w"> </span>    def commit(self):
+<span class="tok-w"> </span>        self._commit()
+<span class="tok-gd">-        self.publish_events()  </span>#<b class="conum">(2)</b>
 
-<span class="tok-gd">-    def publish_events(self):</span><span class="tok-w"></span>
-<span class="tok-gi">+    def collect_new_events(self):</span><span class="tok-w"></span>
-<span class="tok-w"> </span>        for product in self.products.seen:<span class="tok-w"></span>
-<span class="tok-w"> </span>            while product.events:<span class="tok-w"></span>
-<span class="tok-gd">-                event = product.events.pop(0)</span><span class="tok-w"></span>
-<span class="tok-gd">-                messagebus.handle(event)</span><span class="tok-w"></span>
-<span class="tok-gi">+                yield product.events.pop(0)  </span><span class="tok-w"></span>#<b class="conum">(3)</b></code></pre>
+<span class="tok-gd">-    def publish_events(self):</span>
+<span class="tok-gi">+    def collect_new_events(self):</span>
+<span class="tok-w"> </span>        for product in self.products.seen:
+<span class="tok-w"> </span>            while product.events:
+<span class="tok-gd">-                event = product.events.pop(0)</span>
+<span class="tok-gd">-                messagebus.handle(event)</span>
+<span class="tok-gi">+                yield product.events.pop(0)  </span>#<b class="conum">(3)</b></code></pre>
 </div>
 </div>
 </div>
@@ -697,30 +692,30 @@ <h4 id="_our_tests_are_all_written_in_terms_of_events_too"><a class="anchor" hre
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w">class TestAddBatch:</span>
-<span class="tok-w"> </span>    def test_for_new_product(self):<span class="tok-w"></span>
-<span class="tok-w"> </span>        uow = FakeUnitOfWork()<span class="tok-w"></span>
-<span class="tok-gd">-        services.add_batch("b1", "CRUNCHY-ARMCHAIR", 100, None, uow)</span><span class="tok-w"></span>
-<span class="tok-gi">+        messagebus.handle(</span><span class="tok-w"></span>
-<span class="tok-gi">+            events.BatchCreated("b1", "CRUNCHY-ARMCHAIR", 100, None), uow</span><span class="tok-w"></span>
-<span class="tok-gi">+        )</span><span class="tok-w"></span>
-<span class="tok-w"> </span>        assert uow.products.get("CRUNCHY-ARMCHAIR") is not None<span class="tok-w"></span>
-<span class="tok-w"> </span>        assert uow.committed<span class="tok-w"></span>
+<pre class="pygments highlight"><code data-lang="diff"><span></span>class TestAddBatch:
+<span class="tok-w"> </span>    def test_for_new_product(self):
+<span class="tok-w"> </span>        uow = FakeUnitOfWork()
+<span class="tok-gd">-        services.add_batch("b1", "CRUNCHY-ARMCHAIR", 100, None, uow)</span>
+<span class="tok-gi">+        messagebus.handle(</span>
+<span class="tok-gi">+            events.BatchCreated("b1", "CRUNCHY-ARMCHAIR", 100, None), uow</span>
+<span class="tok-gi">+        )</span>
+<span class="tok-w"> </span>        assert uow.products.get("CRUNCHY-ARMCHAIR") is not None
+<span class="tok-w"> </span>        assert uow.committed
 
-<span class="tok-w">...</span>
+...
 
-<span class="tok-w"> </span>class TestAllocate:<span class="tok-w"></span>
-<span class="tok-w"> </span>    def test_returns_allocation(self):<span class="tok-w"></span>
-<span class="tok-w"> </span>        uow = FakeUnitOfWork()<span class="tok-w"></span>
-<span class="tok-gd">-        services.add_batch("batch1", "COMPLICATED-LAMP", 100, None, uow)</span><span class="tok-w"></span>
-<span class="tok-gd">-        result = services.allocate("o1", "COMPLICATED-LAMP", 10, uow)</span><span class="tok-w"></span>
-<span class="tok-gi">+        messagebus.handle(</span><span class="tok-w"></span>
-<span class="tok-gi">+            events.BatchCreated("batch1", "COMPLICATED-LAMP", 100, None), uow</span><span class="tok-w"></span>
-<span class="tok-gi">+        )</span><span class="tok-w"></span>
-<span class="tok-gi">+        result = messagebus.handle(</span><span class="tok-w"></span>
-<span class="tok-gi">+            events.AllocationRequired("o1", "COMPLICATED-LAMP", 10), uow</span><span class="tok-w"></span>
-<span class="tok-gi">+        )</span><span class="tok-w"></span>
-<span class="tok-w"> </span>        assert result == "batch1"<span class="tok-w"></span></code></pre>
+<span class="tok-w"> </span>class TestAllocate:
+<span class="tok-w"> </span>    def test_returns_allocation(self):
+<span class="tok-w"> </span>        uow = FakeUnitOfWork()
+<span class="tok-gd">-        services.add_batch("batch1", "COMPLICATED-LAMP", 100, None, uow)</span>
+<span class="tok-gd">-        result = services.allocate("o1", "COMPLICATED-LAMP", 10, uow)</span>
+<span class="tok-gi">+        messagebus.handle(</span>
+<span class="tok-gi">+            events.BatchCreated("batch1", "COMPLICATED-LAMP", 100, None), uow</span>
+<span class="tok-gi">+        )</span>
+<span class="tok-gi">+        result = messagebus.handle(</span>
+<span class="tok-gi">+            events.AllocationRequired("o1", "COMPLICATED-LAMP", 10), uow</span>
+<span class="tok-gi">+        )</span>
+<span class="tok-w"> </span>        assert result == "batch1"</code></pre>
 </div>
 </div>
 </div>
@@ -740,19 +735,19 @@ <h4 id="temporary_ugly_hack"><a class="anchor" href="#temporary_ugly_hack"></a>A
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def handle(<span class="tok-w"></span>
-<span class="tok-w"> </span>    event: events.Event,<span class="tok-w"></span>
-<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,<span class="tok-w"></span>
-<span class="tok-w"> </span>):<span class="tok-w"></span>
-<span class="tok-gi">+    results = []</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    queue = [event]<span class="tok-w"></span>
-<span class="tok-w"> </span>    while queue:<span class="tok-w"></span>
-<span class="tok-w"> </span>        event = queue.pop(0)<span class="tok-w"></span>
-<span class="tok-w"> </span>        for handler in HANDLERS[type(event)]:<span class="tok-w"></span>
-<span class="tok-gd">-            handler(event, uow=uow)</span><span class="tok-w"></span>
-<span class="tok-gi">+            results.append(handler(event, uow=uow))</span><span class="tok-w"></span>
-<span class="tok-w"> </span>            queue.extend(uow.collect_new_events())<span class="tok-w"></span>
-<span class="tok-gi">+    return results</span><span class="tok-w"></span></code></pre>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def handle(
+<span class="tok-w"> </span>    event: events.Event,
+<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork,
+<span class="tok-w"> </span>):
+<span class="tok-gi">+    results = []</span>
+<span class="tok-w"> </span>    queue = [event]
+<span class="tok-w"> </span>    while queue:
+<span class="tok-w"> </span>        event = queue.pop(0)
+<span class="tok-w"> </span>        for handler in HANDLERS[type(event)]:
+<span class="tok-gd">-            handler(event, uow=uow)</span>
+<span class="tok-gi">+            results.append(handler(event, uow=uow))</span>
+<span class="tok-w"> </span>            queue.extend(uow.collect_new_events())
+<span class="tok-gi">+    return results</span></code></pre>
 </div>
 </div>
 </div>
@@ -771,20 +766,20 @@ <h4 id="_modifying_our_api_to_work_with_events"><a class="anchor" href="#_modify
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>@app.route("/allocate", methods=["POST"])<span class="tok-w"></span>
-<span class="tok-w"> </span>def allocate_endpoint():<span class="tok-w"></span>
-<span class="tok-w"> </span>    try:<span class="tok-w"></span>
-<span class="tok-gd">-        batchref = services.allocate(</span><span class="tok-w"></span>
-<span class="tok-gd">-            request.json["orderid"],  </span><span class="tok-w"></span>#<b class="conum">(1)</b>
-<span class="tok-gd">-            request.json["sku"],</span><span class="tok-w"></span>
-<span class="tok-gd">-            request.json["qty"],</span><span class="tok-w"></span>
-<span class="tok-gd">-            unit_of_work.SqlAlchemyUnitOfWork(),</span><span class="tok-w"></span>
-<span class="tok-gi">+        event = events.AllocationRequired(  </span><span class="tok-w"></span>#<b class="conum">(2)</b>
-<span class="tok-gi">+            request.json["orderid"], request.json["sku"], request.json["qty"]</span><span class="tok-w"></span>
-<span class="tok-w"> </span>        )<span class="tok-w"></span>
-<span class="tok-gi">+        results = messagebus.handle(event, unit_of_work.SqlAlchemyUnitOfWork())  </span><span class="tok-w"></span>#<b class="conum">(3)</b>
-<span class="tok-gi">+        batchref = results.pop(0)</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    except InvalidSku as e:<span class="tok-w"></span></code></pre>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>@app.route("/allocate", methods=["POST"])
+<span class="tok-w"> </span>def allocate_endpoint():
+<span class="tok-w"> </span>    try:
+<span class="tok-gd">-        batchref = services.allocate(</span>
+<span class="tok-gd">-            request.json["orderid"],  </span>#<b class="conum">(1)</b>
+<span class="tok-gd">-            request.json["sku"],</span>
+<span class="tok-gd">-            request.json["qty"],</span>
+<span class="tok-gd">-            unit_of_work.SqlAlchemyUnitOfWork(),</span>
+<span class="tok-gi">+        event = events.AllocationRequired(  </span>#<b class="conum">(2)</b>
+<span class="tok-gi">+            request.json["orderid"], request.json["sku"], request.json["qty"]</span>
+<span class="tok-w"> </span>        )
+<span class="tok-gi">+        results = messagebus.handle(event, unit_of_work.SqlAlchemyUnitOfWork())  </span>#<b class="conum">(3)</b>
+<span class="tok-gi">+        batchref = results.pop(0)</span>
+<span class="tok-w"> </span>    except InvalidSku as e:</code></pre>
 </div>
 </div>
 </div>
@@ -1411,7 +1406,7 @@ <h4 id="_why_have_we_achieved"><a class="anchor" href="#_why_have_we_achieved"><
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_10_commands.html b/book/chapter_10_commands.html
index ed37509..cab9dcb 100644
--- a/book/chapter_10_commands.html
+++ b/book/chapter_10_commands.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Commands and Command Handler</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -936,7 +931,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_11_external_events.html b/book/chapter_11_external_events.html
index cebb9e3..9ee2654 100644
--- a/book/chapter_11_external_events.html
+++ b/book/chapter_11_external_events.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Event-Driven Architecture: Using Events to Integrate Microservices</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -1029,7 +1024,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_12_cqrs.html b/book/chapter_12_cqrs.html
index ea98d61..329f3bb 100644
--- a/book/chapter_12_cqrs.html
+++ b/book/chapter_12_cqrs.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Command-Query Responsibility Segregation (CQRS)</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
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 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -598,7 +593,7 @@ <h3 id="hold-on-ch12"><a class="anchor" href="#hold-on-ch12"></a>Hold On to Your
 <span class="tok-k">def</span> <span class="tok-nf">allocations</span><span class="tok-p">(</span><span class="tok-n">orderid</span><span class="tok-p">:</span> <span class="tok-nb">str</span><span class="tok-p">,</span> <span class="tok-n">uow</span><span class="tok-p">:</span> <span class="tok-n">unit_of_work</span><span class="tok-o">.</span><span class="tok-n">SqlAlchemyUnitOfWork</span><span class="tok-p">):</span>
     <span class="tok-k">with</span> <span class="tok-n">uow</span><span class="tok-p">:</span>
         <span class="tok-n">results</span> <span class="tok-o">=</span> <span class="tok-n">uow</span><span class="tok-o">.</span><span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>
-            <span class="tok-sd">"""</span>
+<span class="tok-w">            </span><span class="tok-sd">"""</span>
 <span class="tok-sd">            SELECT ol.sku, b.reference</span>
 <span class="tok-sd">            FROM allocations AS a</span>
 <span class="tok-sd">            JOIN batches AS b ON a.batch_id = b.id</span>
@@ -908,7 +903,7 @@ <h3 id="_time_to_completely_jump_the_shark"><a class="anchor" href="#_time_to_co
 <pre class="pygments highlight"><code data-lang="python"><span></span><span class="tok-k">def</span> <span class="tok-nf">allocations</span><span class="tok-p">(</span><span class="tok-n">orderid</span><span class="tok-p">:</span> <span class="tok-nb">str</span><span class="tok-p">,</span> <span class="tok-n">uow</span><span class="tok-p">:</span> <span class="tok-n">unit_of_work</span><span class="tok-o">.</span><span class="tok-n">SqlAlchemyUnitOfWork</span><span class="tok-p">):</span>
     <span class="tok-k">with</span> <span class="tok-n">uow</span><span class="tok-p">:</span>
         <span class="tok-n">results</span> <span class="tok-o">=</span> <span class="tok-n">uow</span><span class="tok-o">.</span><span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>
-            <span class="tok-sd">"""</span>
+<span class="tok-w">            </span><span class="tok-sd">"""</span>
 <span class="tok-sd">            SELECT sku, batchref FROM allocations_view WHERE orderid = :orderid</span>
 <span class="tok-sd">            """</span><span class="tok-p">,</span>
             <span class="tok-nb">dict</span><span class="tok-p">(</span><span class="tok-n">orderid</span><span class="tok-o">=</span><span class="tok-n">orderid</span><span class="tok-p">),</span>
@@ -1015,7 +1010,7 @@ <h4 id="_updating_a_read_model_table_using_an_event_handler"><a class="anchor" h
 <span class="tok-p">):</span>
     <span class="tok-k">with</span> <span class="tok-n">uow</span><span class="tok-p">:</span>
         <span class="tok-n">uow</span><span class="tok-o">.</span><span class="tok-n">session</span><span class="tok-o">.</span><span class="tok-n">execute</span><span class="tok-p">(</span>
-            <span class="tok-sd">"""</span>
+<span class="tok-w">            </span><span class="tok-sd">"""</span>
 <span class="tok-sd">            INSERT INTO allocations_view (orderid, sku, batchref)</span>
 <span class="tok-sd">            VALUES (:orderid, :sku, :batchref)</span>
 <span class="tok-sd">            """</span><span class="tok-p">,</span>
@@ -1357,7 +1352,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/chapter_13_dependency_injection.html b/book/chapter_13_dependency_injection.html
index 25dc00e..17d2620 100644
--- a/book/chapter_13_dependency_injection.html
+++ b/book/chapter_13_dependency_injection.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Dependency Injection (and Bootstrapping)</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -1011,23 +1006,23 @@ <h3 id="_using_bootstrap_in_our_entrypoints"><a class="anchor" href="#_using_boo
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-gd">-from allocation import views</span><span class="tok-w"></span>
-<span class="tok-gi">+from allocation import bootstrap, views</span><span class="tok-w"></span>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-gd">-from allocation import views</span>
+<span class="tok-gi">+from allocation import bootstrap, views</span>
 
-<span class="tok-w"> </span>app = Flask(__name__)<span class="tok-w"></span>
-<span class="tok-gd">-orm.start_mappers()  </span><span class="tok-w"></span>#<b class="conum">(1)</b>
-<span class="tok-gi">+bus = bootstrap.bootstrap()</span><span class="tok-w"></span>
+<span class="tok-w"> </span>app = Flask(__name__)
+<span class="tok-gd">-orm.start_mappers()  </span>#<b class="conum">(1)</b>
+<span class="tok-gi">+bus = bootstrap.bootstrap()</span>
 
 
-<span class="tok-w"> </span>@app.route("/add_batch", methods=["POST"])<span class="tok-w"></span>
-<span class="tok-gu">@@ -19,8 +16,7 @@ def add_batch():</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    cmd = commands.CreateBatch(<span class="tok-w"></span>
-<span class="tok-w"> </span>        request.json["ref"], request.json["sku"], request.json["qty"], eta<span class="tok-w"></span>
-<span class="tok-w"> </span>    )<span class="tok-w"></span>
-<span class="tok-gd">-    uow = unit_of_work.SqlAlchemyUnitOfWork()  </span><span class="tok-w"></span>#<b class="conum">(2)</b>
-<span class="tok-gd">-    messagebus.handle(cmd, uow)</span><span class="tok-w"></span>
-<span class="tok-gi">+    bus.handle(cmd)  </span><span class="tok-w"></span>#<b class="conum">(3)</b>
-<span class="tok-w"> </span>    return "OK", 201<span class="tok-w"></span></code></pre>
+<span class="tok-w"> </span>@app.route("/add_batch", methods=["POST"])
+<span class="tok-gu">@@ -19,8 +16,7 @@ def add_batch():</span>
+<span class="tok-w"> </span>    cmd = commands.CreateBatch(
+<span class="tok-w"> </span>        request.json["ref"], request.json["sku"], request.json["qty"], eta
+<span class="tok-w"> </span>    )
+<span class="tok-gd">-    uow = unit_of_work.SqlAlchemyUnitOfWork()  </span>#<b class="conum">(2)</b>
+<span class="tok-gd">-    messagebus.handle(cmd, uow)</span>
+<span class="tok-gi">+    bus.handle(cmd)  </span>#<b class="conum">(3)</b>
+<span class="tok-w"> </span>    return "OK", 201</code></pre>
 </div>
 </div>
 </div>
@@ -1252,13 +1247,13 @@ <h4 id="_define_the_abstract_and_concrete_implementations"><a class="anchor" hre
 <div class="content">
 <div class="listingblock skip">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def bootstrap(<span class="tok-w"></span>
-<span class="tok-w"> </span>    start_orm: bool = True,<span class="tok-w"></span>
-<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork = unit_of_work.SqlAlchemyUnitOfWork(),<span class="tok-w"></span>
-<span class="tok-gd">-    send_mail: Callable = email.send,</span><span class="tok-w"></span>
-<span class="tok-gi">+    notifications: AbstractNotifications = EmailNotifications(),</span><span class="tok-w"></span>
-<span class="tok-w"> </span>    publish: Callable = redis_eventpublisher.publish,<span class="tok-w"></span>
-<span class="tok-w"> </span>) -&gt; messagebus.MessageBus:<span class="tok-w"></span></code></pre>
+<pre class="pygments highlight"><code data-lang="diff"><span></span><span class="tok-w"> </span>def bootstrap(
+<span class="tok-w"> </span>    start_orm: bool = True,
+<span class="tok-w"> </span>    uow: unit_of_work.AbstractUnitOfWork = unit_of_work.SqlAlchemyUnitOfWork(),
+<span class="tok-gd">-    send_mail: Callable = email.send,</span>
+<span class="tok-gi">+    notifications: AbstractNotifications = EmailNotifications(),</span>
+<span class="tok-w"> </span>    publish: Callable = redis_eventpublisher.publish,
+<span class="tok-w"> </span>) -&gt; messagebus.MessageBus:</code></pre>
 </div>
 </div>
 </div>
@@ -1325,34 +1320,34 @@ <h4 id="_figure_out_how_to_integration_test_the_real_thing"><a class="anchor" hr
 <div class="content">
 <div class="listingblock">
 <div class="content">
-<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">version</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-s">"3"</span><span class="tok-w"></span>
+<pre class="pygments highlight"><code data-lang="yaml"><span></span><span class="tok-nt">version</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-s">"3"</span>
 
-<span class="tok-nt">services</span><span class="tok-p">:</span><span class="tok-w"></span>
+<span class="tok-nt">services</span><span class="tok-p">:</span>
 
-<span class="tok-w">  </span><span class="tok-nt">redis_pubsub</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">build</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-nt">context</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">.</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-nt">dockerfile</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">Dockerfile</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">allocation-image</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span><span class="tok-w"></span>
+<span class="tok-w">  </span><span class="tok-nt">redis_pubsub</span><span class="tok-p">:</span>
+<span class="tok-w">    </span><span class="tok-nt">build</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-nt">context</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">.</span>
+<span class="tok-w">      </span><span class="tok-nt">dockerfile</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">Dockerfile</span>
+<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">allocation-image</span>
+<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span>
 
-<span class="tok-w">  </span><span class="tok-nt">api</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">allocation-image</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span><span class="tok-w"></span>
+<span class="tok-w">  </span><span class="tok-nt">api</span><span class="tok-p">:</span>
+<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">allocation-image</span>
+<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span>
 
-<span class="tok-w">  </span><span class="tok-nt">postgres</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">postgres:9.6</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span><span class="tok-w"></span>
+<span class="tok-w">  </span><span class="tok-nt">postgres</span><span class="tok-p">:</span>
+<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">postgres:9.6</span>
+<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span>
 
-<span class="tok-w">  </span><span class="tok-nt">redis</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">redis:alpine</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span><span class="tok-w"></span>
+<span class="tok-w">  </span><span class="tok-nt">redis</span><span class="tok-p">:</span>
+<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">redis:alpine</span>
+<span class="tok-w">    </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">...</span>
 
-<span class="tok-w">  </span><span class="tok-nt">mailhog</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">mailhog/mailhog</span><span class="tok-w"></span>
-<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"11025:1025"</span><span class="tok-w"></span>
-<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"18025:8025"</span><span class="tok-w"></span></code></pre>
+<span class="tok-w">  </span><span class="tok-nt">mailhog</span><span class="tok-p">:</span>
+<span class="tok-w">    </span><span class="tok-nt">image</span><span class="tok-p">:</span><span class="tok-w"> </span><span class="tok-l tok-l-Scalar tok-l-Scalar-Plain">mailhog/mailhog</span>
+<span class="tok-w">    </span><span class="tok-nt">ports</span><span class="tok-p">:</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"11025:1025"</span>
+<span class="tok-w">      </span><span class="tok-p tok-p-Indicator">-</span><span class="tok-w"> </span><span class="tok-s">"18025:8025"</span></code></pre>
 </div>
 </div>
 </div>
@@ -1536,7 +1531,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/epilogue_1_how_to_get_there_from_here.html b/book/epilogue_1_how_to_get_there_from_here.html
index 86c1461..e41dec8 100644
--- a/book/epilogue_1_how_to_get_there_from_here.html
+++ b/book/epilogue_1_how_to_get_there_from_here.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Epilogue</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -1322,7 +1317,7 @@ <h3 id="_wrap_up"><a class="anchor" href="#_wrap_up"></a>Wrap-Up</h3>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2022-04-23 09:04:28 +0100
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/introduction.html b/book/introduction.html
index d469fa7..00e80d0 100644
--- a/book/introduction.html
+++ b/book/introduction.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.16">
+<meta name="generator" content="Asciidoctor 2.0.20">
 <title>Introduction</title>
 <style>
 /* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
@@ -100,11 +100,6 @@
 
 </style>
 <style>
-pre { line-height: 125%; }
-td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
 pre.pygments .hll { background-color: #ffffcc }
 pre.pygments { background: #f0f0f0; }
 pre.pygments .tok-c { color: #60a0b0; font-style: italic } /* Comment */
@@ -577,7 +572,7 @@ <h3 id="_a_place_for_all_our_business_logic_the_domain_model"><a class="anchor"
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2021-03-22 22:31:07 UTC
+Last updated 2023-11-24 02:20:52 UTC
 </div>
 </div>
 <div><div id="disqus_thread" style="margin: 10px"></div>
diff --git a/book/part1.html b/book/part1.html
index ea776fa..bae1485 100644
--- a/book/part1.html
+++ b/book/part1.html
@@ -3,7 +3,7 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
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 info, and how we run different types of tests.</p>
 </li>
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-<p><a href="/book/appendix_csvs.html">[appendix_csvs]</a> is a "proof is in the pudding" kind of content, showing
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-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
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diff --git a/book/part2.html b/book/part2.html
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-Last updated 2021-02-26 00:40:46 UTC
+Last updated 2023-11-24 02:20:52 UTC
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diff --git a/book/preface.html b/book/preface.html
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-Last updated 2022-04-23 09:13:59 +0100
+Last updated 2023-11-24 02:20:52 UTC
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