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ECQ: show base-changed curves in database on curve home pages#6854

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JohnCremona wants to merge 2 commits intoLMFDB:mainfrom
JohnCremona:ecq_show_bc
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ECQ: show base-changed curves in database on curve home pages#6854
JohnCremona wants to merge 2 commits intoLMFDB:mainfrom
JohnCremona:ecq_show_bc

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@JohnCremona
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This is a draft PR towards satisfying the feature request #6833 . It implements both options (1) and (2) defined there, though the implementation of (2) does not work properly. My intention is that someone fixes (2) and then we remove option (1).

@AndrewVSutherland
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AndrewVSutherland commented Feb 6, 2026

FYI, tests failed because the Clabel attribute was not set for a random curve (this can happen, e,g, for curves of conductor > 500000), but I'm confused as to how your change would have cause this (or if it didn't why we haven't seen this before).

@AndrewVSutherland
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Rerunning the test fixed the problem (presumably a different random curve).

@JohnCremona
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Option (1) which lists all the curve in the Related Objects section is implemented by line 567 in the patch so that line can be deleted once option (2), implemented in line 568, works. What is needed there is a URL which shows the result of an ECNF search for curves whose label is in the list bclabels. The code now on line 567 does not achieve this.

@AndrewVSutherland
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Should we close this in view of #6878?

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