3bcfb3c576
- Add BUILD.bazel across tidal, tidal-net, tidal-server, tidalctl for bzlmod build - Add tidal/ crate docs (README, CHANGELOG, CONTRIBUTING, AGENTS, CLAUDE, API, ARCHITECTURE) and ai-lookup reference - Add docker standalone/cluster/deploy images, compose, and prometheus config - Harden WAL (batch format, writer, dedup, diagnostics), text syncer/collectors, and vector registry - Expand tidalctl CLI and tests; restructure WAL/visibility integration test suites - Refine tidal-net transport/client/server and tidal-server cluster/scatter-gather
34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
# Signals
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**Last Updated:** 2026-02-19
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**Confidence:** High
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## Summary
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Signals are typed, timestamped event streams attached to entity signal ledgers. The database natively understands signal semantics: velocity (rate of change), decay (exponential or linear, configurable per type), and windowed aggregation (last hour, day, 7 days, all time).
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**Key Facts:**
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- Signals are NOT fields — they are streams with temporal semantics
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- Decay half-lives are declared in schema, applied at query time
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- Velocity is computed natively (rate of new events in a window)
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- Windowed aggregation: 1h, 24h, 7d, all-time windows are first-class
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- Negative signals (skip, hide, block) are equal citizens with positive signals
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- Signal writes are atomic transactions updating item ledger, user preference vector, and relationship weights in one commit
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**File Pointer:** `VISION.md:39-41`, `USE_CASES.md:669-711` (Appendix C)
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## Signal Categories
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| Category | Examples | Decay |
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|----------|----------|-------|
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| Positive engagement | view, like, share, completion | slow-medium |
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| Negative engagement | skip, hide, block, not_interested | fast-permanent |
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| Relationship | follow, unfollow, interaction_weight | slow-permanent |
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| Quality | completion ratio, dwell_time, replay | slow-medium |
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| Recommendation | autoplay_accept/reject, search_click | medium |
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| Notification | notification_open, notification_dismiss | slow-medium |
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## Related Topics
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- [Entities](./entities.md)
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- [Ranking Profiles](./ranking-profiles.md)
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