diff --git a/examples/07_data_management.ipynb b/examples/07_data_management.ipynb
new file mode 100644
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+++ b/examples/07_data_management.ipynb
@@ -0,0 +1,554 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Data management"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "import pyerrors as pe"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Data has been written using pyerrors 2.0.0.\n",
+      "Format version 0.1\n",
+      "Written by fjosw on 2022-01-06 11:11:19 +0100 on host XPS139305, Linux-5.11.0-44-generic-x86_64-with-glibc2.29\n",
+      "\n",
+      "Description:  Test data for the correlator example\n"
+     ]
+    }
+   ],
+   "source": [
+    "correlator_data = pe.input.json.load_json(\"./data/correlator_test\")\n",
+    "my_correlator = pe.Corr(correlator_data)\n",
+    "my_correlator.gamma_method()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import autograd.numpy as anp\n",
+    "def func_exp(a, x):\n",
+    "    return a[1] * anp.exp(-a[0] * x)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "rows = []\n",
+    "for t_start in range(12, 17):\n",
+    "    for t_stop in range(30, 35):\n",
+    "        fr = my_correlator.fit(func_exp, [t_start, t_stop], silent=True)\n",
+    "        fr.gamma_method()\n",
+    "        row = {\"t_start\": t_start,\n",
+    "               \"t_stop\": t_stop,\n",
+    "               \"datapoints\": t_stop - t_start + 1,\n",
+    "               \"chisquare_by_dof\": fr.chisquare_by_dof,\n",
+    "               \"mass\": fr[0]}\n",
+    "        rows.append(row)\n",
+    "my_df = pd.DataFrame(rows)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>t_start</th>\n",
+       "      <th>t_stop</th>\n",
+       "      <th>datapoints</th>\n",
+       "      <th>chisquare_by_dof</th>\n",
+       "      <th>mass</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>12</td>\n",
+       "      <td>30</td>\n",
+       "      <td>19</td>\n",
+       "      <td>0.057872</td>\n",
+       "      <td>0.2218(12)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>12</td>\n",
+       "      <td>31</td>\n",
+       "      <td>20</td>\n",
+       "      <td>0.063951</td>\n",
+       "      <td>0.2221(11)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>12</td>\n",
+       "      <td>32</td>\n",
+       "      <td>21</td>\n",
+       "      <td>0.064960</td>\n",
+       "      <td>0.2223(11)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>12</td>\n",
+       "      <td>33</td>\n",
+       "      <td>22</td>\n",
+       "      <td>0.066495</td>\n",
+       "      <td>0.2224(10)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>12</td>\n",
+       "      <td>34</td>\n",
+       "      <td>23</td>\n",
+       "      <td>0.066606</td>\n",
+       "      <td>0.2225(10)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>13</td>\n",
+       "      <td>30</td>\n",
+       "      <td>18</td>\n",
+       "      <td>0.051577</td>\n",
+       "      <td>0.2215(12)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>13</td>\n",
+       "      <td>31</td>\n",
+       "      <td>19</td>\n",
+       "      <td>0.060901</td>\n",
+       "      <td>0.2219(11)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>13</td>\n",
+       "      <td>32</td>\n",
+       "      <td>20</td>\n",
+       "      <td>0.063551</td>\n",
+       "      <td>0.2221(12)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>13</td>\n",
+       "      <td>33</td>\n",
+       "      <td>21</td>\n",
+       "      <td>0.066406</td>\n",
+       "      <td>0.2223(12)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>13</td>\n",
+       "      <td>34</td>\n",
+       "      <td>22</td>\n",
+       "      <td>0.067237</td>\n",
+       "      <td>0.2224(12)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>14</td>\n",
+       "      <td>30</td>\n",
+       "      <td>17</td>\n",
+       "      <td>0.052349</td>\n",
+       "      <td>0.2213(13)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>14</td>\n",
+       "      <td>31</td>\n",
+       "      <td>18</td>\n",
+       "      <td>0.063640</td>\n",
+       "      <td>0.2218(13)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>14</td>\n",
+       "      <td>32</td>\n",
+       "      <td>19</td>\n",
+       "      <td>0.066883</td>\n",
+       "      <td>0.2220(14)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>14</td>\n",
+       "      <td>33</td>\n",
+       "      <td>20</td>\n",
+       "      <td>0.070019</td>\n",
+       "      <td>0.2223(15)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>14</td>\n",
+       "      <td>34</td>\n",
+       "      <td>21</td>\n",
+       "      <td>0.070775</td>\n",
+       "      <td>0.2224(15)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>15</th>\n",
+       "      <td>15</td>\n",
+       "      <td>30</td>\n",
+       "      <td>16</td>\n",
+       "      <td>0.056088</td>\n",
+       "      <td>0.2213(16)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>16</th>\n",
+       "      <td>15</td>\n",
+       "      <td>31</td>\n",
+       "      <td>17</td>\n",
+       "      <td>0.067552</td>\n",
+       "      <td>0.2218(17)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>17</th>\n",
+       "      <td>15</td>\n",
+       "      <td>32</td>\n",
+       "      <td>18</td>\n",
+       "      <td>0.070170</td>\n",
+       "      <td>0.2221(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>18</th>\n",
+       "      <td>15</td>\n",
+       "      <td>33</td>\n",
+       "      <td>19</td>\n",
+       "      <td>0.072516</td>\n",
+       "      <td>0.2224(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>19</th>\n",
+       "      <td>15</td>\n",
+       "      <td>34</td>\n",
+       "      <td>20</td>\n",
+       "      <td>0.072509</td>\n",
+       "      <td>0.2225(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>20</th>\n",
+       "      <td>16</td>\n",
+       "      <td>30</td>\n",
+       "      <td>15</td>\n",
+       "      <td>0.059969</td>\n",
+       "      <td>0.2214(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>21</th>\n",
+       "      <td>16</td>\n",
+       "      <td>31</td>\n",
+       "      <td>16</td>\n",
+       "      <td>0.070874</td>\n",
+       "      <td>0.2220(20)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>22</th>\n",
+       "      <td>16</td>\n",
+       "      <td>32</td>\n",
+       "      <td>17</td>\n",
+       "      <td>0.072437</td>\n",
+       "      <td>0.2223(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>23</th>\n",
+       "      <td>16</td>\n",
+       "      <td>33</td>\n",
+       "      <td>18</td>\n",
+       "      <td>0.073684</td>\n",
+       "      <td>0.2225(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>24</th>\n",
+       "      <td>16</td>\n",
+       "      <td>34</td>\n",
+       "      <td>19</td>\n",
+       "      <td>0.072767</td>\n",
+       "      <td>0.2227(20)</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "    t_start  t_stop  datapoints  chisquare_by_dof        mass\n",
+       "0        12      30          19          0.057872  0.2218(12)\n",
+       "1        12      31          20          0.063951  0.2221(11)\n",
+       "2        12      32          21          0.064960  0.2223(11)\n",
+       "3        12      33          22          0.066495  0.2224(10)\n",
+       "4        12      34          23          0.066606  0.2225(10)\n",
+       "5        13      30          18          0.051577  0.2215(12)\n",
+       "6        13      31          19          0.060901  0.2219(11)\n",
+       "7        13      32          20          0.063551  0.2221(12)\n",
+       "8        13      33          21          0.066406  0.2223(12)\n",
+       "9        13      34          22          0.067237  0.2224(12)\n",
+       "10       14      30          17          0.052349  0.2213(13)\n",
+       "11       14      31          18          0.063640  0.2218(13)\n",
+       "12       14      32          19          0.066883  0.2220(14)\n",
+       "13       14      33          20          0.070019  0.2223(15)\n",
+       "14       14      34          21          0.070775  0.2224(15)\n",
+       "15       15      30          16          0.056088  0.2213(16)\n",
+       "16       15      31          17          0.067552  0.2218(17)\n",
+       "17       15      32          18          0.070170  0.2221(18)\n",
+       "18       15      33          19          0.072516  0.2224(18)\n",
+       "19       15      34          20          0.072509  0.2225(18)\n",
+       "20       16      30          15          0.059969  0.2214(21)\n",
+       "21       16      31          16          0.070874  0.2220(20)\n",
+       "22       16      32          17          0.072437  0.2223(21)\n",
+       "23       16      33          18          0.073684  0.2225(21)\n",
+       "24       16      34          19          0.072767  0.2227(20)"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "my_df"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pe.input.pandas.to_sql(my_df, \"mass_table\", \"my_db.sqlite\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "new_df = df = pe.input.pandas.read_sql(f\"SELECT t_start, t_stop, mass FROM mass_table WHERE t_start > 13\"\n",
+    "                                       ,\"my_db.sqlite\"\n",
+    "                                       ,auto_gamma=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>t_start</th>\n",
+       "      <th>t_stop</th>\n",
+       "      <th>mass</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>14</td>\n",
+       "      <td>30</td>\n",
+       "      <td>0.2213(13)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>14</td>\n",
+       "      <td>31</td>\n",
+       "      <td>0.2218(13)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>14</td>\n",
+       "      <td>32</td>\n",
+       "      <td>0.2220(14)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>14</td>\n",
+       "      <td>33</td>\n",
+       "      <td>0.2223(15)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>14</td>\n",
+       "      <td>34</td>\n",
+       "      <td>0.2224(15)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>15</td>\n",
+       "      <td>30</td>\n",
+       "      <td>0.2213(16)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>15</td>\n",
+       "      <td>31</td>\n",
+       "      <td>0.2218(17)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>15</td>\n",
+       "      <td>32</td>\n",
+       "      <td>0.2221(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>15</td>\n",
+       "      <td>33</td>\n",
+       "      <td>0.2224(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>15</td>\n",
+       "      <td>34</td>\n",
+       "      <td>0.2225(18)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>16</td>\n",
+       "      <td>30</td>\n",
+       "      <td>0.2214(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>16</td>\n",
+       "      <td>31</td>\n",
+       "      <td>0.2220(20)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>16</td>\n",
+       "      <td>32</td>\n",
+       "      <td>0.2223(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>16</td>\n",
+       "      <td>33</td>\n",
+       "      <td>0.2225(21)</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>16</td>\n",
+       "      <td>34</td>\n",
+       "      <td>0.2227(20)</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "    t_start  t_stop        mass\n",
+       "0        14      30  0.2213(13)\n",
+       "1        14      31  0.2218(13)\n",
+       "2        14      32  0.2220(14)\n",
+       "3        14      33  0.2223(15)\n",
+       "4        14      34  0.2224(15)\n",
+       "5        15      30  0.2213(16)\n",
+       "6        15      31  0.2218(17)\n",
+       "7        15      32  0.2221(18)\n",
+       "8        15      33  0.2224(18)\n",
+       "9        15      34  0.2225(18)\n",
+       "10       16      30  0.2214(21)\n",
+       "11       16      31  0.2220(20)\n",
+       "12       16      32  0.2223(21)\n",
+       "13       16      33  0.2225(21)\n",
+       "14       16      34  0.2227(20)"
+      ]
+     },
+     "execution_count": 9,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "new_df"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}