db.xml key defined but not recognised

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Environment: Windows7, IIS7, MySQL 5.1.57, Concrete5 5.4.1.1

I'm getting this rather odd error message when I place my custom block:

Fatal error: Uncaught exception 'ADODB_Exception' with message 'mysql error: [-1: No primary key found for table btCtL] in BlockRecord::UpdateActiveTable(0, 0) ' in C:\inetpub\wwwroot\Concrete5\concrete\libraries\3rdparty\adodb\adodb-exceptions.inc.php:78 Stack trace: #0
C:\inetpub\wwwroot\Concrete5\concrete\libraries\3rdparty\adodb\adodb-active-record.inc.php(494): adodb_throw('mysql', 'BlockRecord::Up...', -1, 'No primary key ...', 0, 0, Object(ADODB_mysql)) #1
C:\inetpub\wwwroot\Concrete5\concrete\libraries\3rdparty\adodb\adodb-active-record.inc.php(402): ADODB_Active_Record->Error('No primary key ...', 'UpdateActiveTab...') #2
C:\inetpub\wwwroot\Concrete5\concrete\libraries\3rdparty\adodb\adodb-active-record.inc.php(136): ADODB_Active_Record->UpdateActiveTable(false) #3
C:\inetpub\wwwroot\Concrete5\concrete\libraries\block_view.php(30): ADODB_Active_Record->__construct('btCtL') #4
C:\inetpub\wwwroot\Concrete5\concrete\libraries\block_controller.php(222): BlockRecord->__construct('btCtL') #5
C:\inetpub\wwwroot\Concrete in C:\inetpub\wwwroot\Concrete5\concrete\libraries\3rdparty\adodb\adodb-exceptions.inc.php on line 78

The db.xml in this case reads

<?xml version="1.0"?>
<schema version="0.3">
<table name="btCtL">
<field name="bID" type="I">
<unsigned />
<key />
</field>
<field name="Number_1" type="C" size="12"></field>
<field name="Number_2" type="C" size="12"></field>
<field name="Number_3" type="C" size="12"></field>
<field name="Number_4" type="C" size="12"></field>
<field name="Number_5" type="C" size="12"></field>
<field name="Number_6" type="C" size="12"></field>
<field name="Number_7" type="C" size="12"></field>
<field name="Number_8" type="C" size="12"></field>
<field name="Number_9" type="C" size="12"></field>
<field name="Number_10" type="C" size="12"></field>
</table>
</schema>

The error has to do with there being "No primary key found for table btCtL" which is demonstrably false. If I go into phpAdmin and force the issue, it works, but I can't be doing that for every client site, nor can I expect clients to do it themselves.

ConcreteDevelopments
 
ConcreteDevelopments replied on at Permalink Reply
ConcreteDevelopments
The problem seems to be Concrete5's. I have just used MySQLInstanceConfig.exe to change from "Best Support for multilingualism" (what I had wanted in the first instance) to "Standard Character Set". This takes the character set from utf8 to Latin1. After this change a Refresh creates a PRIMARY key on bID.