Update BTE to use string templates so query graph node keys are dynamic

[maximusunc]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.35%. Comparing base (8a18f58) to head (a462e63).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
workers/bte_lookup/worker.py	0.00%	20 Missing ⚠️

Files with missing lines	Coverage Δ
workers/bte_lookup/worker.py	0.00% <0.00%> (ø)

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