# AI Lookup Index

| Topic | File | Confidence | Updated | Summary |
|-------|------|------------|---------|---------|
| Entities | `services/entities.md` | High | 2026-02-19 | Items, Users, Creators — core data model |
| Signals | `services/signals.md` | High | 2026-02-19 | Typed event streams with decay, velocity, windowed aggregation |
| Ranking Profiles | `services/ranking-profiles.md` | High | 2026-02-19 | Named scoring functions declared in schema |
| Query Language | `features/query-language.md` | High | 2026-02-19 | RETRIEVE/SEARCH/SIGNAL query surface |
| Sort Modes | `features/sort-modes.md` | High | 2026-02-19 | 25+ native sort modes (hot, trending, rising, etc.) |
| Filters | `features/filters.md` | High | 2026-02-19 | Composable filter dimensions across all queries |