diff -r 9f7da8dc8df8 -r 7dce6c0f06fb doc/images/db-schema.svg
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/images/db-schema.svg	Sun Dec 18 11:49:46 2011 +0100
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
+ -->
+<!-- Title: G Pages: 1 -->
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+ viewBox="0.00 0.00 468.00 131.29" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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+<title>G</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-143 521,-143 521,5 -4,5"/>
+<!-- message -->
+<g id="node1" class="node"><title>message</title>
+<polygon fill="none" stroke="black" points="8,-25.5 8,-118.5 98,-118.5 98,-25.5 8,-25.5"/>
+<text text-anchor="start" x="36.5" y="-109.367" font-family="Bitstream-Vera Sans" font-size="7.00">message</text>
+<polygon fill="none" stroke="black" points="9,-103 9,-105 97,-105 97,-103 9,-103"/>
+<text text-anchor="start" x="11" y="-95.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; id : INTEGER</text>
+<text text-anchor="start" x="11" y="-84.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; recipient : VARCHAR</text>
+<text text-anchor="start" x="11" y="-73.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; isBilled : BOOLEAN</text>
+<text text-anchor="start" x="11" y="-62.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; date : DATETIME</text>
+<text text-anchor="start" x="11" y="-51.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; price : NUMERIC(8, 2)</text>
+<text text-anchor="start" x="11" y="-40.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; job : INTEGER</text>
+<text text-anchor="start" x="11" y="-29.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; offer : VARCHAR</text>
+</g>
+<!-- job -->
+<g id="node3" class="node"><title>job</title>
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+<text text-anchor="start" x="154" y="-112.867" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; hash : VARCHAR</text>
+<text text-anchor="start" x="154" y="-101.867" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; info : VARCHAR</text>
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+<text text-anchor="start" x="154" y="-79.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; user : VARCHAR</text>
+</g>
+<!-- message&#45;&gt;job -->
+<g id="edge2" class="edge"><title>message&#45;&gt;job</title>
+<path fill="none" stroke="black" d="M106.327,-84.57C115.412,-86.7114 124.894,-88.9465 134.112,-91.1194"/>
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+<text text-anchor="middle" x="116.118" y="-80.2359" font-family="Bitstream-Vera Sans" font-size="7.00">+ job</text>
+</g>
+<!-- offer -->
+<g id="node5" class="node"><title>offer</title>
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+<text text-anchor="start" x="291" y="-8.86667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; typ : VARCHAR</text>
+</g>
+<!-- message&#45;&gt;offer -->
+<g id="edge4" class="edge"><title>message&#45;&gt;offer</title>
+<path fill="none" stroke="black" d="M106.216,-64.6732C153.699,-58.1357 223.047,-48.5878 271.726,-41.8855"/>
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+<text text-anchor="middle" x="271.255" y="-43.9165" font-family="Bitstream-Vera Sans" font-size="7.00">+ name</text>
+<text text-anchor="middle" x="114.618" y="-56.9504" font-family="Bitstream-Vera Sans" font-size="7.00">+ offer</text>
+</g>
+<!-- userright -->
+<g id="node2" class="node"><title>userright</title>
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+<text text-anchor="start" x="426" y="-72.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; user : VARCHAR</text>
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+<text text-anchor="start" x="426" y="-50.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; isDefault : BOOLEAN</text>
+</g>
+<!-- apiuser -->
+<g id="node4" class="node"><title>apiuser</title>
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+<text text-anchor="start" x="295" y="-105.867" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; name : VARCHAR</text>
+<text text-anchor="start" x="295" y="-94.8667" font-family="Bitstream-Vera Sans" font-size="7.00">&#45; apikey : VARCHAR</text>
+</g>
+<!-- job&#45;&gt;apiuser -->
+<g id="edge10" class="edge"><title>job&#45;&gt;apiuser</title>
+<path fill="none" stroke="black" d="M243.641,-106.489C253.891,-106.791 264.704,-107.109 275.063,-107.414"/>
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+<!-- apiuser&#45;&gt;userright -->
+<g id="edge6" class="edge"><title>apiuser&#45;&gt;userright</title>
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+</g>
+<!-- offer&#45;&gt;userright -->
+<g id="edge8" class="edge"><title>offer&#45;&gt;userright</title>
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