Function moduleNotifyKeyUnlink

app/redis-6.2.6/src/module.c:8385–8393

When a module key is deleted (in dbAsyncDelete/dbSyncDelete/dbOverwrite), it * will be called to tell the module which key is about to be released. */

/* When a module key is deleted (in dbAsyncDelete/dbSyncDelete/dbOverwrite), it 
*  will be called to tell the module which key is about to be released. */
void moduleNotifyKeyUnlink(robj *key, robj *val) {
    if (val->type == OBJ_MODULE) {
        moduleValue *mv = val->ptr;
        moduleType *mt = mv->type;
        if (mt->unlink != NULL) {
            mt->unlink(key,mv->value);
        } 
    }
}

/* --------------------------------------------------------------------------
 * Modules API internals