Detecting and reporting changes in data values

A system comprising:

• one or more processors, coupled to memory and configured to:
• receive identification of one or more data items of interest to a user;
• establish one or more rules for monitoring at least one or more fields in one or more data sources corresponding to the one or more data items;
• execute, based at least on the one or more rules, a first query against the one or more data sources;
• store, responsive to the first query, a first value of the one or more data items to a data store separate from the one or more data sources;
• monitor, using one or more queries based at least on the one or more rules, at least the one or more data items in the one or more data sources for a change in the first value;
• detect, responsive to monitoring, the change in the first value of the at least the one or more data items in the one or more data sources;
• store, responsive to the detection, the first value of the at least one data item in the data store prior to the change;
• update, the first value of the at least one data item in the data store to a second value while maintaining the first value of the at least one data item in the data store prior to the change;
• and
• communicate, responsive to the change in the first value of the at least one data item, a notification to a device of the user responsive to a notification setting of the user.

A non-transitory computer-readable medium, comprising instructions that, when executed by one or more processors of a device, cause the one or more processors to:

• receive identification of one or more data items of interest to a user;
• establish one or more rules for monitoring at least one or more fields in one or more data sources corresponding to the one or more data items;
• execute, based at least on the one or more rules, a first query against the one or more data sources;
• store, responsive to the first query, a first value of the one or more data items to a data store separate from the one or more data sources;
• monitor, using one or more queries based at least on the one or more rules, at least the one or more data items in the one or more data sources for a change in the first value;
• detect, responsive to monitoring, the change in the first value of the at least the one or more data items in the one or more data sources;
• store, responsive to the detection, the first value of the at least one data item in the data store prior to the change;
• update, the first value of the at least one data item in the data store to a second value while maintaining the first value of the at least one data item in the data store prior to the change;
• and
• communicate, responsive to the change in the first value of the at least one data item, a notification to a device of the user responsive to a notification setting of the user.