Individual skill

timescaledb-hyperfunctions

Use this skill when writing analytical SQL over time-series data with the TimescaleDB Toolkit (timescaledb_toolkit extension) hyperfunctions: approximate percentiles, statistical summaries, time-weighted averages, counter/gauge rates, uptime/heartbeat tracking, state durations, OHLC candlesticks, approximate distinct counts, top-N, and downsampling. **Trigger when user asks to:** - Compute percentiles/medians/p95/p99 over large or rolled-up time-series data - Compute rates or deltas from monotonic counters (Prometheus-style) or gauges - Compute time-weighted averages or integrals over irregularly sampled data - Track uptime/downtime from heartbeats, or time spent in each state - Build OHLC/candlestick or VWAP data for financial ticks - Store re-aggregatable summaries in continuous aggregates (two-step aggregation, rollup) - Approximate COUNT DISTINCT, find top-N / most frequent values, or downsample for charts **Keywords:** timescaledb_toolkit, hyperfunctions, percentile_agg, uddsketch, tdigest, approx_percentile, stats_agg, time_weight, counter_agg, gauge_agg, heartbeat_agg, state_agg, candlestick_agg, hyperloglog, approx_count_distinct, min_n, max_n, mcv_agg, lttb, asap_smooth, rollup, two-step aggregation

skills/timescaledb-hyperfunctions/SKILL.md

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# TimescaleDB Toolkit Hyperfunctions

Hyperfunctions are SQL aggregates and accessors from the `timescaledb_toolkit` extension for analysis that plain PostgreSQL aggregates handle badly: percentiles that can be re-aggregated, rates over resetting counters, averages over irregular samples, uptime, state durations, and more.

## Setup

```sql
CREATE EXTENSION IF NOT EXISTS timescaledb_toolkit;   -- preinstalled on Tiger Cloud
SELECT extversion FROM pg_extension WHERE extname = 'timescaledb_toolkit';
ALTER EXTENSION timescaledb_toolkit UPDATE;           -- after upgrading the package
```

**Only use functions from the default schema in persistent objects.** Anything in the `toolkit_experimental` schema can change between releases, and `ALTER EXTENSION ... UPDATE` **drops** views, continuous aggregates, and functions that depend on it. All functions in this skill are stable.