Default `end` in diffy API is set to a past date (November 2023)

[anmolarora]

The default value for end in the diffy API is currently hardcoded to a past date (November 2023). This outdated default value causes confusion and can lead to unexpected behaviors for new users trying the API without explicitly specifying the end.

Reference in the code: ApiController.scala#L86

Proposed Solution:

Update the default end to set a future timestamp (say 2050) or the current timestamp (now)