[ZombieBlue]

Summary

Chatflow messages can have an empty model-prompt field even when their user query is persisted. Suggested-question trace assembly currently copies that empty field into the exported span input.

Keep a recorded prompt when present; otherwise fall back to the persisted query from the same tenant/app-scoped message. This read-only change preserves the generated questions, timings and correlation, without changing stored messages or provider adapters.

Fixes #45384

Validation

• Added eight SQLite-backed regression cases covering empty string/list/object prompts, an existing prompt, and both nonempty and empty queries. They also check canonical span inputs/outputs and unchanged stored data.
• Before the fix: 5 failed, 13 passed.
• After the fix: 18 passed (make test TARGET_TESTS=./api/tests/unit_tests/repositories/test_trace_record_repository.py).
• make lint passed (82 import contracts kept).
• make type-check passed.

Checklist

• Associated issue and scope reviewed.
• Verified the change and added regression tests.
• Backend lint and type checks passed.
• No schema or documentation changes required.

From Codex

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	83.01%	83.01%	+0.00%
Strict coverage	82.66%	82.66%	+0.00%
Typed symbols	85,603	85,609	+6
Untyped symbols	17,598	17,597	-1
Modules	4373	4373	0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.79%. Comparing base (dc36c3e) to head (a11ae6e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #45386   +/-   ##
=======================================
  Coverage   89.79%   89.79%           
=======================================
  Files        6239     6239           
  Lines      390965   390965           
  Branches    79305    79305           
=======================================
+ Hits       351077   351086    +9     
+ Misses      33788    33783    -5     
+ Partials     6100     6096    -4     

Flag	Coverage Δ
api	89.64% <ø> (+<0.01%)	⬆️

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