I build custom software and AI features for SaaS teams, and one pattern keeps showing up across projects: churn tooling almost always reacts to cancellations after the fact, when the real signal shows up weeks earlier. The teams I've worked with who catch it early aren't just tracking logins, they're watching usage frequency per feature. A customer can log in daily and still be quietly disengaging from the exact features that justified the price. Building usage-decay alerting into a product (i...