added foreign key to database
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		@@ -14,7 +14,7 @@
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    <table>
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    <caption>Table: user</caption>
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    <tr><th>Colum Name</th><th>SQL Type</th><th>Description</th></tr>
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    <tr><td>name</td><td>varchar(50)</td><td>The user's name (pseudonym).</td></tr>
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    <tr><td>name</td><td>varchar(50), primary key</td><td>The user's name (pseudonym).</td></tr>
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    <tr><td>pubkey</td><td>text</td><td>The user's public key.</td></tr>
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    </table>
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@@ -24,7 +24,7 @@
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require_once("opendb.php");
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try {
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  $db->query('create table if not exists user (name varchar(50) not null unique key, pubkey text not null);');
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  $db->query('create table if not exists user (name varchar(50) not null primary key, pubkey text not null) character set utf8 engine=innodb;');
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} catch (Exception $e) {
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  error('database error on server');
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}
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