Magent extention : Working config.xml file with custom table

config.xml

<config>
    <modules>
        <Sample_Socialmedia>
            <version>0.0.1</version>
        </Sample_Socialmedia>
    </modules>    
    <frontend>
        <routers>
            <socailpromo>
                <use>standard</use>
                <args>
                    <module>Sample_Socialmedia</module>
                    <frontName>sharediscount</frontName>
                </args>
            </socailpromo>
        </routers>        
    </frontend> 
    <global>      
        <models>
            <socialmedia>
                <class>Sample_Socialmedia_Model</class>
                <resourceModel>socialmedia_mysql4</resourceModel>
            </socialmedia>  
            <socialmedia_mysql4>
                <class>Sample_Socialmedia_Model_Mysql4</class>
                <entities>  
                    <discount>
                        <table>sharediscount</table>
                    </discount>                  
                </entities>                 
            </socialmedia_mysql4>     
        </models>          
        <helpers>
            <socialmedia>
                <class>Sample_Socialmedia_Helper</class>
            </socialmedia>
        </helpers>        
        <events> 
            <sales_quote_collect_totals_after>
                <observers>
                    <set_discount_static>
                        <type>singleton</type>
                        <class>Sample_Socialmedia_Model_Observer</class>
                        <method>setdiscountamount</method>
                    </set_discount_static>
                </observers>
            </sales_quote_collect_totals_after>   
        </events>        
       <resources>       
            <socialmedia_write>
                <connection>
                    <use>core_write</use>
                </connection>
            </socialmedia_write>
            <socialmedia_read>
                <connection>
                    <use>core_read</use>
                </connection>
            </socialmedia_read>
            <socialmedia_setup>
                <setup>
                    <module>Sample_Socialmedia</module>
                </setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </socialmedia_setup>
        </resources>          
    </global>        
</config>

This config xml will look for a Model file named Discount in your Model directory and Make sure you have a resource files and collection added as well. The table name sharediscount.

PS: I just added this gist for my reference :) I tend to do mistakes in the config and break the damn thing !!!