"soupçon of putrid smell"
i'm not sure what it is you mean exactly by this.
But; whether you are only tasting/making this for yourself, or ESPECIALLY
..
If you have any intention of ever sharing the final product{s} with any others...
I would stick by the old adage; "when in doubt, throw it out" .
or even
"follow your nose".
In my opinion, if it doesn't smell like;
a delicious, slightly sour version of some of / all of the ingredients...
Something is possibly off with that ferment, and i would stick to the; "When in doubt throw it out" adage.
yes pH testing is
most certainly necessary as well
but in my opinion, if it smells off or wrong to you, upon first opening... 'just throw it out, or compost it'.
Repeat; take even more notes, and try again.
best of luck.
Hopefully others with more fermenting experience will chime in with their opinion as well.