Signals su buƙatun Django don aiwatar da ƙirar observer pattern — suna ba da damar wasu aiki na jibi da jama'a a faɗi sa'ad da takamaiman events ke faruwa (kamar model da aka ajiye ko sanyare). Suna ba da damar decoupled code: satu daya na app na maimaita events a wani sashi ba tare da jidi kai tsaye ba.
Yawaitar built-in signals
pre_save / post_save → before / after a model instance is saved
pre_delete / post_delete → before / after a model instance is deleted
m2m_changed → a ManyToMany relationship changed
request_started / finished→ request lifecycle
user_logged_in / out → authentication events
