History for zodb_version

??changed:
-
Table zodb_version:

<table border=1>
 <th>Name</th><th>Description</th><th>Storing</th><th>Db field type</th>
 <tr>
  <td>z_oid</td>
  <td>OID</td>
  <td>binascii.b2a_base64 repr of oid</td>
  <td>CHAR(12) NOT NULL</td>
 </tr>
 <tr>
  <td>z_serial</td>
  <td>Serial number</td>
  <td>binascii.b2a_base64 repr of serial</td>
  <td>CHAR(12) NOT NULL</td>
 </tr>
 <tr>
  <td>z_status</td>
  <td>Status code</td>
  <td>Single-char status code used primarily for nontransactional storages</td>
  <td>CHAR(1)</td>
 </tr>
 <tr>
   <td>z_version</td>
   <td>Version string</td>
   <td>string <= 65KB</td>
   <td>very long VARCHAR or BLOB or LONG</td>
 </tr>
 <tr>
   <td>z_nv</td>
   <td>Non version serial number</td>
   <td>binascii.b2a_base64 repr of nonversion serial for oid</td>
   <td>CHAR(12)</td>
 </tr>
</table>