Enhancements: more editing abilities and calendar reminder system

My user has the following questions/requests:

1. The only blank field in these records is the end date, however, I cannot edit this. I only have the option to delete the breeding pair, which I do not want to do. Is there a way to mark crosses as inactive?

2. I also want the ability to edit the litter information, as I will not know the genotyping information until 1-3 weeks after the litter is born.

3. Are there plans to add a calendar/reminder system to Alyx? I have listed some reminders related to Breeding Pairs/ Litters that would be particularly helpful for me:
   3a) Remove father reminder (yes/no) If yes, set reminder to 14 days after animals are crossed.

3b) Mating confirmation (optional field, date format). Here the researcher will note the date that a plug is detected in the female if that information is relevant.

3c) Experimental reminder (yes/no). If yes, add fields for reminder date and short description. (For instance, if a mother must be injected IP with BrdU or tamoxifen for developmental studies).

3d) Check for litter (automatic, 21 days after initial cross date)
Birthdate Confirmation (yes/no). Sometimes the birthdate is approximate, but for developmental studies it is important to confirm whether the birthdate is exact.

3e) Collect genotyping sample (Optional, yes/no). If yes, add fields for sample collection age (for instance, a number can be entered "7" and that will automatically set a reminder to collect genotyping samples 7 days after the litter is born.

3f) Wean litter (automatic, 21 days after litter is born)

No files, tests, or entry points are identified in the issue. First narrow the many editing and reminder requests into a defined scope, then identify the relevant breeding-pair and litter models and interfaces; done should include agreed behavior for each selected request.