Fix/minor schema fixes

[chrisbc]

Minor changes to RuptureSet

• correct use of meta instead of arguments
• migrate created to File schema
• make some input arguments explicit

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.64%. Comparing base (86a1944) to head (16b5c7d).
⚠️ Report is 4 commits behind head on deploy-test.

Additional details and impacted files

@@               Coverage Diff               @@
##           deploy-test     #279      +/-   ##
===============================================
- Coverage        88.64%   88.64%   -0.01%     
===============================================
  Files               48       48              
  Lines             2519     2518       -1     
  Branches           142      142              
===============================================
- Hits              2233     2232       -1     
  Misses             238      238              
  Partials            48       48              

Flag	Coverage Δ
unittests	88.64% <100.00%> (-0.01%)	⬇️

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