improve flow in Normalization

Author: dimitri-yatsenko

book/30-schema-design/055-normalization.ipynb

@@ -292,32 +292,6 @@
         "This workflow-centric view fundamentally shapes normalization principles and explains why DataJoint emphasizes immutability and avoidance of updates.\n"
       ]
     },
-    {
-      "cell_type": "markdown",
-      "metadata": {},
-      "source": [
-        "## Practical Example: Animal Research Lab\n",
-        "\n",
-        "Let's apply these principles to design a schema for tracking mice in a research lab.\n",
-        "\n",
-        "### ❌ Poor Design (Violates Normalization)\n",
-        "\n",
-        "```python\n",
-        "@schema\n",
-        "class Mouse(dj.Manual):\n",
-        "    definition = \"\"\"\n",
-        "    mouse_id : int\n",
-        "    ---\n",
-        "    date_of_birth : date          # ✓ Permanent property of mouse\n",
-        "    sex : enum('M', 'F')          # ✓ Permanent property of mouse\n",
-        "    cage_id : int                 # ✗ CHANGEABLE - violates Rule 3\n",
-        "    current_weight : decimal(5,2) # ✗ CHANGEABLE - violates Rule 3\n",
-        "    cage_location : varchar(50)   # ✗ Property of CAGE, not mouse - violates Rule 2\n",
-        "    cage_capacity : int           # ✗ Property of CAGE, not mouse - violates Rule 2\n",
-        "    \"\"\"\n",
-        "```"
-      ]
-    },
     {
       "cell_type": "markdown",
       "metadata": {},
@@ -623,6 +597,32 @@
         "**UPDATE exists** for the rare cases when data corruption or entry errors must be corrected surgically. It's a maintenance tool, not an operational tool.\n"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "## Practical Example: Animal Research Lab\n",
+        "\n",
+        "Let's apply these principles to design a schema for tracking mice in a research lab.\n",
+        "\n",
+        "### ❌ Poor Design (Violates Normalization)\n",
+        "\n",
+        "```python\n",
+        "@schema\n",
+        "class Mouse(dj.Manual):\n",
+        "    definition = \"\"\"\n",
+        "    mouse_id : int\n",
+        "    ---\n",
+        "    date_of_birth : date          # ✓ Permanent property of mouse\n",
+        "    sex : enum('M', 'F')          # ✓ Permanent property of mouse\n",
+        "    cage_id : int                 # ✗ CHANGEABLE - violates Rule 3\n",
+        "    current_weight : decimal(5,2) # ✗ CHANGEABLE - violates Rule 3\n",
+        "    cage_location : varchar(50)   # ✗ Property of CAGE, not mouse - violates Rule 2\n",
+        "    cage_capacity : int           # ✗ Property of CAGE, not mouse - violates Rule 2\n",
+        "    \"\"\"\n",
+        "```"
+      ]
+    },
     {
       "cell_type": "markdown",
       "metadata": {},