Problem

DjangoIntegration(cache_spans=True) traces cache.set() and cache.get(), but cache.add() emits no cache span.

cache.add() is a normal Django cache write API, so this shows up in practice for apps that use add-on-miss / write-if-absent flows.

Repro

from django.core.cache import cache
import sentry_sdk
from sentry_sdk.integrations.django import DjangoIntegration

sentry_sdk.init(
    integrations=[DjangoIntegration(cache_spans=True)],
    traces_sample_rate=1.0,
)

with sentry_sdk.start_transaction(name="t", op="test"):
    cache.add("k", "value")

Actual: no cache.put span for cache.add().

Expected: cache.add() should be traced like the other cache write methods.

Notes

I verified locally that cache.set() emits a span while cache.add() does not, and a targeted fix is just to instrument add as a cache write.