Remove circuit extraction legacy code

[eleftherioszisis]

Issue: #637

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
pytest	97.71% <ø> (-0.04%)	⬇️

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Files with missing lines	Coverage Δ
app/db/model.py	99.13% <ø> (-0.03%)	⬇️
app/db/triggers.py	100.00% <ø> (ø)
app/db/types.py	99.54% <ø> (-0.01%)	⬇️
app/routers/__init__.py	100.00% <ø> (ø)
app/routers/types.py	100.00% <ø> (ø)

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