Offline conversion tracking

A method for searching multiple databases in parallel, the method comprising:

• maintaining, by one or more processors, a central database that includes database entries corresponding to database entries received from a first plurality of distributed databases maintained by a first plurality of sources, wherein the central database is kept up-to-date via automated data integration with the first plurality of distributed databases maintained by the first plurality of sources;
• receiving an object availability query from a first user device associated with a user, the object availability query identifying (a) a requested object, (b) a geographical area, and (c) an object identifier associated with the requested object;
• identifying, by the one or more processors, a group of sources within the geographical area, the group of sources comprising a first set of sources corresponding to at least one source of the first plurality of sources, a second set of sources corresponding to at least one source of a second plurality of sources that maintain a second plurality of distributed databases that are not integrated with the central database, and a third set of sources corresponding to at least one source of a third plurality of sources that do not maintain a network accessible database;
• determining availability, by the one or more processors, of the requested object by the group of sources, the determining comprising initiating all three of the following processes in parallel:
• real-time searching for data indicative of the requested object in the database entries of the central database that correspond to the first set of sources and that have been maintained with up-to-date information via data integration by communicating with the central database in response to receiving the object availability query,
• searching for the data indicative of the requested object in the second plurality of distributed databases maintained by the second set of sources that are not integrated with the central database by communicating over a network with the second plurality of distributed databases in response to receiving the object availability query, and
• determining, for each of the third set of sources, contact information to initiate automated communication with one or more computing devices located at respective source locations of the third set of sources;
• initiating the automated communication, using the contact information, with the one or more computing devices located at respective source locations of the third set of sources, the automated communication prompting performance of a manual search for data indicative of the requested object at the respective source location of the third set of sources;
• asynchronously receiving, by the one or more processors, search results corresponding to the first set of sources, the second set of sources, and the third set of sources;
• aggregating the search results into groups of search results as the search results become available from at least a portion of the group of sources;
• communicating, by the one or more processors, the groups of search results to a second user device for display on a composite user interface of the second user device, the second user device different from the first user device;
• determining data indicative of an offline interaction between the user and at least one source of the group of sources based on data received from the second user device;
• and
• storing, by the one or more processors, in a database entry of the central database, data indicative of the offline interaction, the database entry associated with the object identifier associated with the requested object.