Update Django model dasmon_statusvariable id field to bigint

[backmari]

Short description of the changes:

Dasmon listener was not able to store updates from Dasmon because the table dasmon_statusvariable id field became out of range. The issue was fixed temporarily by making the integer type larger in the production database:

ALTER TABLE dasmon_statusvariable ALTER COLUMN id TYPE BIGINT;

This changes the maximum ID's from 2147483647 to 9223372036854775807. See https://docs.djangoproject.com/en/3.2/ref/models/fields/#bigautofield

This PR is to make that change to the Django model as well so that the next time migrations are run on the database the Django model and database table definition are consistent.

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

Defect 5742

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.07%. Comparing base (9ee319e) to head (61f5ec0).

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #165      +/-   ##
==========================================
- Coverage   77.16%   77.07%   -0.09%     
==========================================
  Files          50       50              
  Lines        4634     4616      -18     
==========================================
- Hits         3576     3558      -18     
  Misses       1058     1058              

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