WIP: Group fdb requests for lazy loading

[sandorkertesz]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.75%. Comparing base (4ea4609) to head (fe2ac81).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #822      +/-   ##
===========================================
+ Coverage    85.69%   85.75%   +0.05%     
===========================================
  Files          182      182              
  Lines        14328    14388      +60     
  Branches       713      713              
===========================================
+ Hits         12279    12339      +60     
  Misses        1844     1844              
  Partials       205      205              

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