Split db load and create cell to avoid forced recreates

slurm-2sql.ipynb

@@ -17,7 +17,15 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "db = sqlite3.connect('test.db')\n",
+    "db = sqlite3.connect('test.db')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
     "slurm2sql.slurm2sql(db, ['-S', '2020-03-18', '-a'])"
    ]
   },