1. A system comprising: one or more processors and executable instructions accessible on a computer-readable medium that, when executed, cause the one or more processors to perform operations comprising: identifying a threshold overlap value defining a value of attribute overlap that triggers a merging of item records; accessing a first item record and a second item record stored in a network database, the first item record and the second item record each comprising one or more attributes; identifying at least one attribute that is common in both the first item record and the second item record; and merging the first item record and second item record into a single item record in response to a level of the at least one attribute identified as being common transgressing the threshold overlap value.