1. A method comprising: generating, by a system including a processor, a smoothed graphical visualization having discrete rings to allow for detection of periodical patterns in unevenly spaced data records over time, where the discrete rings at different locations along a radial axis represent respective plural different time periods, and the discrete rings contain pixels representing values of an attribute of the data records, wherein a first of the discrete rings encircles a second of the discrete rings, and wherein each time period of the plural time periods comprises a plurality of time intervals, each pixel of the pixels represents a respective data record for a corresponding time interval, and pixels of a subset of the pixels along the radial axis are time aligned so that the pixels of the subset represent a common time interval of the plurality of time intervals; and assigning, by the system, visual indicators to the corresponding pixels, where a first of the visual indicators for a first time interval that is without a data record is based on aggregating values of the attribute of neighboring data records including first and second neighboring data records, wherein the first neighboring data record is earlier in time than the first time interval, and the second neighboring data record is later in time than the first time interval, and where a second of the visual indicators for a second time interval having multiple data records is based on aggregating values of the attribute of the multiple data records.