Users may interact with a multitude of content on content sources. Content sources may desire to identify sessions that the user created. As provided herein, a user interacting with a content source may be identified. Source data and session data regarding the user interaction may be extracted. A data pipeline may be generated based upon the source data and the session data. The data pipeline may be sessionized into a single data feed based upon a finished current events interval (e.g., sessions that are activated and terminated during a first interval), a finished last events interval (e.g., sessions that are activated during the first interval and terminated during a second interval), a second finished current events interval (e.g., sessions that are activated and terminated during the second interval), and/or a second finished last events interval (e.g., sessions that are activated during the second interval and terminated during a third interval).